CN103944281B - A kind of energy transmitting terminal and wireless energy transfer method - Google Patents

Abstract

The invention discloses a kind of energy transmitting terminal and wireless energy transfer method, relate to wireless energy transmission technology field, the present invention selects best segmentation energy transmitting coil according to the positional information of energy receiving terminal, can improve the coefficient of coup between segmentation energy transmitting coil and receiving coil, thereby improve energy transmission efficiency, both reduce the suffered electromagnetic radiation of patient, and made again system to carry out energy supply by portable lithium battery, and made patient freer.

Description

An energy transmitter and a wireless energy transmission method

technical field

The present invention relates to the technical field of wireless energy transmission, in particular to an energy transmitter and a wireless energy transmission method.

Background technique

The emergence of capsule endoscope has brought medical endoscope technology into a new era. It not only solves the defect that traditional endoscope cannot inspect the small intestine, but also greatly reduces the pain of patients. However, currently existing movable implantable medical devices are only equipped with 1 or 2 cameras, and can only rely on the peristalsis of the intestinal tract to move passively, and then take images of the intestinal tract. With the continuous increase of clinical needs, movable implantable medical devices need to integrate more functions, such as wireless endoscopic capsules for active movement through propellers, capsules for injecting drugs through needles, mechanical devices to achieve Movable implantable medical devices for liveness detection. More functions lead to greater power consumption or larger space, so the button battery inside the movable implantable medical device cannot meet its needs. It is a more promising direction to supply energy to conventional medical equipment (to simplify the statement, hereinafter referred to as "energy receiving end").

By setting a set of coils at the energy transmitting end and the energy receiving end respectively, the coil at the transmitting end is connected to the power amplifier and generates an alternating electromagnetic field, and the coil at the receiving end induces an electromotive force in the alternating electromagnetic field, thereby transmitting energy to the back-end circuit. At present, the receiving end mostly adopts a three-dimensional orthogonal receiving coil, and the transmitting end mainly has two coil structures, a single helical coil and a Helmholtz coil. The coupling coefficient between the above two kinds of transmitting coils and receiving coils is low, resulting in low wireless energy transmission efficiency. On the one hand, a cable needs to be connected to the device for power supply, which limits the freedom of the patient; on the other hand, the greater transmission power brought about by the low transmission efficiency exposes the patient to stronger electromagnetic radiation, which leads to the safety of wireless energy transmission decline.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is: how to improve the efficiency of wireless energy transmission, so that there is no need to use cables for power supply, and reduce the electromagnetic radiation of wireless energy transmission.

(2) Technical solution

In order to solve the above technical problems, the present invention provides an energy transmitting end, which includes: multi-group segmented energy transmitting coils, an energy supply unit, a multiplexing unit, a position information acquisition unit and a control unit, the The position information acquisition unit, the control unit, the multiplexing unit and the multiple groups of segmental energy transmitting coils are connected in sequence, and the energy supply unit is respectively connected with the multiplexing unit, the control unit and the positional information acquisition unit,

The position information acquiring unit is used to acquire the position information of the energy receiving end;

The control unit is configured to receive and control the multiplexing unit according to the location information;

The multiplexing unit is configured to select at least one group of coils in the multiple groups of segmented energy transmitting coils to communicate with the energy supply unit under the control of the control unit;

The multiple sets of segmented energy transmitting coils are used to transmit wireless energy when communicating with the energy supply unit, so as to ensure wireless transmission efficiency.

Wherein, the location information acquisition unit includes: a positioning subunit and/or a wireless data receiving subunit,

The positioning subunit is used to obtain the position coordinates of the energy receiving end;

The wireless data receiving subunit is used to acquire wireless energy intensity data of the energy receiving end.

Wherein, the energy supply unit includes: a power supply, an oscillator, a power amplifier, an impedance matching network and a resonant capacitor, the power supply, the oscillator, a power amplifier, and an impedance matching network are connected in sequence, and the power supply is connected to the control unit, the location The information acquisition unit is connected to the power amplifier respectively, and the resonant capacitor is set between the impedance matching network and the multiplexing unit, or between each group of segmented energy transmitting coils and the multiplexing unit.

Wherein, when the resonant capacitor is set between the impedance matching network and the multiplexing unit, the number of the resonant capacitor is one; The number of coils of the transmitting coils is the same and corresponds to each other.

Wherein, when P _opt is an integer, the height H of each group of segmental energy transmitting coils is all the same;

When P _opt is not an integer, the energy transmitting coils with a total height of H _T are divided into groups of P _opt1 with a height of The segmented energy transmitting coils; or, the energy transmitting coils whose total height is _HT are divided into P _opt2 groups of segmented energy transmitting coils with a height of H and a group of segmented energy transmitting coils with a height of H ₂ ;

in, H _T is the total height of the energy transmitting coil, H=0.445R, P _opt1 ＝int<P _opt >, int<x> is the integer operator that takes the nearest distance to x, H ₂ ＝H _T -H·P _opt2 , R is the radius of the energy transmitting coil, is the floor operator.

The invention also discloses a wireless energy transmission method, which includes the following steps:

A1: Every preset time t, the position information acquisition unit acquires the position coordinates of the energy receiving end;

A2: The control unit judges whether the energy receiving end is located within the range of the lowermost segmented energy transmitting coil, if so, execute step A4, otherwise execute step A3;

A3: The control unit determines the segmented energy transmitting coil closest to the energy receiving end according to the position coordinates, and controls the multiplexing unit so that the segmented energy transmitting coil closest to the energy receiving end is the same as The energy supply unit is connected so that the segmented energy transmitting coil closest to the energy receiving end works, and returns to step A1;

A4: Use the lowermost segmented energy transmitting coil as the current coil, and keep the current coil working until the set time, then end the process.

The invention also discloses a wireless energy transmission method, which includes the following steps:

B1: The control unit randomly selects any segmented energy transmitting coil except the uppermost segmented energy transmitting coil and the lowermost segmented energy transmitting coil as the current coil J, and connects the current coil J with the energy supply unit, The position information acquisition unit acquires the wireless energy intensity data E _j corresponding to the current coil J;

B2: After the current coil J works for a preset time t, it is judged whether the current coil J is the uppermost segmented energy transmitting coil, if so, then perform step B3, otherwise the control unit switches the current coil J to work on coil J-1 , the position information acquisition unit acquires the wireless energy intensity data E _{j-1 corresponding to the current coil J-1} , compares E _j and E _j-1 , if E _j-1 >E _j , execute step B4, otherwise execute step B3, the coil J-1 is a segmented energy transmitting coil adjacent to the current coil J and located above the current coil J;

B3: The control unit switches to coil J+1 to work, the position information acquisition unit acquires the wireless energy intensity data E _{j+1 corresponding to the current coil J+1} , compares E _j with E _j+1 , if E _{j+ 1} >E _j , then execute step B4, otherwise the control unit switches the operation of coil J+1 to coil J, and returns to step B2, the coil J+1 is adjacent to the current coil J and located at the Describe the segmented energy transmitting coils below the current coil J;

B4: Record the working coil as the current coil J, and judge whether the current coil J is the lowermost segmental energy transmitting coil, if so, keep the current coil working until the set time, and end the process, otherwise, return Step B2.

The invention also discloses a wireless energy transmission method, which includes the following steps:

C1: The control unit randomly selects any segmented energy transmitting coil except the uppermost segmented energy transmitting coil and the lowermost segmented energy transmitting coil as the current coil J, and connects the current coil J with the energy supply unit, The position information acquisition unit acquires the wireless energy intensity data E _j corresponding to the current coil J;

C2: After the current coil J works for a preset time t, the control unit makes the current coil J and coil J-1 work simultaneously, and the position information acquisition unit acquires the corresponding wireless energy intensity data E _j,j-1 , the Coil J-1 is a segmented energy transmitting coil adjacent to the current coil J and located above the current coil J;

C3: compare E _j with E _j,j-1 , if E _j,j-1 /E _j ≥ 1, the control unit only makes coil J-1 work, and the position information acquisition unit acquires the corresponding wireless energy Intensity data E _j-1 , and execute step C4, otherwise execute step C5;

C4: compare E _j and E _j-1 , if E _j-1 /E _j ≥ 1, then execute step C8, otherwise, the control unit only makes coil J work, and execute step C8;

C5: The control unit enables the current coil J and the coil J+1 to work at the same time, the position information acquisition unit acquires the corresponding wireless energy intensity data E _j,j+1 , and the coil J+1 is the same as the current coil a segmented energy transmitting coil adjacent to J and located below the current coil J;

C6: compare E _j and E _j,j+1 , if E _j,j+1 /E _j ≥ 1, the control unit only makes coil J+1 work, and the position information acquisition unit acquires the corresponding wireless energy Intensity data E _j+1 , and execute step C7, otherwise execute step C2;

C7: compare E _j and E _j+1 , if E _j+1 /E _j ≥ 1, then execute step C8, otherwise, the control unit only makes coil J work, and execute step C2;

C8: Record the working coil as the current coil J, and judge whether the current coil J is the lowermost segmented energy transmitting coil, if so, keep the current coil working until the set time, and end the process, otherwise, return Step C2.

The invention also discloses a wireless energy transmission method, which includes the following steps:

D1: every preset time t, the position information acquisition unit acquires the position coordinates of the energy receiving end;

D2: The control unit judges whether the energy receiving end is located within the range of the lowermost segmented energy transmitting coil, if so, execute step D6, otherwise execute step D3;

D3: The control unit determines the segmented energy transmitting coil closest to the energy receiving end according to the position coordinates, takes the segmented energy transmitting coil closest to the energy receiving end as the current coil, and controls multiple channels Selecting a unit, so that the current coil communicates with the energy supply unit, so that the current coil works, and execute step D4;

D4: The control unit determines whether the energy receiving end is located inside the current coil according to the position coordinates, if it is located inside the current coil, then perform step D1, if it is located at the edge of two adjacent segmented transmitting coils area, the location information acquisition unit acquires the corresponding wireless energy intensity data E ₁ , and executes step D5;

D5: The control unit switches the current coil operation to the other coil of the two adjacent segmented transmitting coils, and the position information acquisition unit acquires the corresponding wireless energy intensity data E ₂ , if E ₁ ≥ E ₂ , the control unit switches the operation of the other coil to the current coil, and returns to step D1, otherwise returns to step D1;

D6: Use the lowermost segmented energy transmitting coil as the current coil, and keep the current coil working until the set time, and end the process.

The invention also discloses a wireless energy transmission method, which includes the following steps:

E1: every preset time t, the position information acquisition unit acquires the position coordinates of the energy receiving end;

E2: The control unit judges whether the energy receiving end is located within the range of the uppermost segmented energy transmitting coil or the lowermost segmented energy transmitting coil, if so, execute step E3, otherwise execute step E4;

E3: If the energy receiving end is located in area Z ₁ or Z _P , the control unit makes the corresponding coil 1 or coil P work independently, and executes step E5, if the energy receiving end is located in area Z _1&2 or Z _{P -1&P} , then the control unit makes the corresponding coil 1 and coil 2 or coil P-1 and coil P work simultaneously, and executes step E5. The segmented energy transmitting coils have a total of P groups, and are respectively called from top to bottom Coils 1,..., P, the zone Z1 is the zone formed between at least one turn extending downward from the middle of the coil ₁ and the top of the coil 1, and the zone Z _P is the zone formed from the middle of the coil P The area formed between at least one turn and the bottom end of the coil P is expanded upwards, the area Z _{1 & 2} is the area between the area Z ₁ and the area Z ₂ , and the area Z _{P-1 & P} is the area Z _P-1 and the area between the zones Z and _P ;

E4: Denote the coil where the energy receiving end is located as J, if the energy receiving end is located in area Z _J , then the control unit makes coil J-1, coil J and coil J+1 work simultaneously, and execute step E5 , if the energy receiving end is located in the area Z _J-1&J or Z _J&J+1 , the control unit makes the corresponding coil J-1 and coil J or coil J and coil J+1 work simultaneously, and executes step E5, the Area Z _J is the area formed by extending at least one turn up and down from the middle of coil J, J=2,...,P-1, area Z _J-1&J is the area between area Z _J-1 and area Z _J , area Z _J&J+1 is the area between area Z _J and area Z _J+1 ;

E5: After working for the preset time t, judge whether the set time is reached, if yes, end the process, otherwise return to step E1.

(3) Beneficial effects

The present invention selects the best segmented energy transmitting coil according to the position information of the energy receiving end, which can improve the coupling coefficient between the segmented energy transmitting coil and the receiving coil, thereby improving the energy transmission efficiency and reducing the electromagnetic radiation suffered by the patient , and enables the system to be powered by a portable lithium battery, making the patient more free.

Description of drawings

Fig. 1 (a) is the system structural block diagram of the first embodiment of the present invention;

Fig. 1(b) is a structural block diagram of the wireless energy transmitting part of the first embodiment of the present invention;

Fig. 1(c) is a structural block diagram of a section of energy transmitting coil in the first embodiment of the present invention;

Fig. 1(d) is a structural block diagram of all energy transmitting coils in the first embodiment of the present invention;

Fig. 1(e) is a flow chart of the steps of the method for switching segmental energy transmitting coils according to the first embodiment of the present invention;

Fig. 2 (a) is the system structural block diagram of the second embodiment of the present invention;

Fig. 2(b) is a flow chart of the steps of the segmented energy transmitting coil switching method according to the second embodiment of the present invention;

Fig. 3 (a) is the system structure block diagram of the third embodiment of the present invention;

Fig. 3 (b) is the block diagram of the impedance matching network of the third embodiment of the present invention;

Fig. 3(c) is a flow chart of the steps of the segmented energy transmitting coil switching method according to the third embodiment of the present invention.

Fig. 4 (a) is the system structure block diagram of the fourth embodiment of the present invention;

Fig. 4(b) is a coil area division diagram of the fourth embodiment of the present invention;

Fig. 4(c) is a flow chart of the step-by-step switching method of the segmented energy transmitting coil according to the fourth embodiment of the present invention;

Fig. 5 (a) is a system structural block diagram of the fifth embodiment of the present invention;

Fig. 5(b) is a block diagram of the impedance matching network of the fifth embodiment of the present invention;

Fig. 5 (c) is the longitudinal sectional view of the transmitting coil of the fifth embodiment of the present invention;

Fig. 5(d) is a flowchart of a method for switching segmented energy transmitting coils according to the fifth embodiment of the present invention.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

The energy transmitting end of this embodiment includes: multi-group segmented energy transmitting coils, an energy supply unit, a multiplexing unit, a location information acquisition unit and a control unit, and the location information acquisition unit, the control unit, the multiplexing unit and multiple The groups of segmented energy transmitting coils are connected in sequence, and the energy supply unit is respectively connected with the multiplexing unit, the control unit and the position information acquisition unit,

The position information acquiring unit is used to acquire the position information of the energy receiving end;

The control unit is configured to receive and control the multiplexing unit according to the location information;

The multiplexing unit is configured to select at least one group of coils in the multiple groups of segmented energy transmitting coils to communicate with the energy supply unit under the control of the control unit;

The multiple sets of segmented energy transmitting coils are used to transmit wireless energy when communicating with the energy supply unit, so as to ensure wireless transmission efficiency.

In order to facilitate the acquisition of location information, preferably, the location information acquisition unit includes: a positioning subunit and/or a wireless data receiving subunit,

The positioning subunit is used to obtain the position coordinates of the energy receiving end;

The wireless data receiving subunit is used to acquire wireless energy intensity data of the energy receiving end.

In order to selectively supply energy to multiple groups of segmented energy transmitting coils, preferably, the energy supply unit includes: a power supply, an oscillator, a power amplifier, an impedance matching network and a resonant capacitor, the power supply, the oscillator, the power amplifier, The impedance matching network is connected to the resonant capacitor in sequence, the power supply is connected to the control unit, the position information acquisition unit and the power amplifier respectively, and the resonant capacitor is connected to the multiplexing unit.

In order to facilitate the generation of wireless energy, preferably, the number of the resonant capacitor is one; or,

The number of the resonant capacitors is the same as the number of coils of the multiple sets of segmented energy transmitting coils, and they correspond one to one, so as to facilitate the selection of multiple sets of coils.

For the convenience of gating multiple sets of coils, preferably, the energy supply unit includes: a power supply, an oscillator, a power amplifier and an impedance matching network, the power supply, an oscillator, a power amplifier and an impedance matching network are connected in sequence, and the power supply and The control unit, the location information acquisition unit and the power amplifier are respectively connected;

A resonant capacitor is provided between each group of segmented energy transmitting coils and the multiplexing unit.

Example 1

As shown in Fig. 1(a), the energy transmitting end of this embodiment includes: multiple groups of segmented energy transmitting coils, an energy supply unit, a multiplexing unit, a positioning subunit and a control unit. Among them, the multi-group segmented energy transmitting coils are used for wireless energy generation; the multiplex unit is used to control the orderly access of the multi-group segmented transmitting coils;

The positioning subunit is used to obtain the position coordinates of the energy receiving end (that is, the movable implantable medical device); currently known positioning technologies include radio positioning, acoustic wave positioning, magnetic field positioning, etc., and the positioning accuracy is within 1cm. Due to the positioning function The specific implementation is a known technology, so it will not be described in detail in the present invention. In addition, it is considered that the realization of the positioning subunit is relatively independent. In order to clarify the description and highlight the key points, the positioning sub-unit is only regarded as a module and will not be described separately.

The control unit is used to control the orderly cooperative work among the various units, generate corresponding control commands according to the position coordinates output by the positioning sub-unit, and transmit the control commands through the I/O port to control the energy emission unit and the multiplexing unit The normal work of the system ensures the efficient operation of the system. It can be composed of an embedded processing unit, an application-specific integrated circuit, or a computer.

Multi-group segmented energy transmitting coils are composed of multiple identical segmented transmitting coils, and each group of segmented transmitting coils can be wound by wires of different materials, different wire diameters, different cross-sectional shapes, and different numbers of strands. The cross-section of the segment transmitting coil can be circular or other shapes.

The multiplexing unit, as a switching device, is arranged between the segmented energy transmitting coil and the power amplifier, and is used to select the best segmented energy transmitting coil to work according to the control signal of the control unit, wherein the control signal is based on the position of the energy receiving end The information is generated, and the multiplexing unit can be composed of a multiplexer or a relay passing a large current.

In order to describe the working principle more conveniently and clearly, the wireless energy transmitting part in Fig. 1(a) is explained independently, as shown in Fig. 1(b), the wireless energy transmitting part includes: multiple sets of identical segmented energy transmitting coils , a resonant capacitor matched with the segmented energy transmitting coil, a multiplexer unit, an oscillator, a power supply, a power amplifier, an impedance matching network for the segmented transmitting coil and the power amplifier, because the segmented transmitting coil is connected every time The size of the coils is exactly the same, the number of turns is the same, and the spacing is the same, so the impedance matching network does not need to be adjusted. Of course, if the transmitting coils of each segment are slightly different in manufacturing, different matching networks can be used. This is Mature technology in this field, the present invention is for the convenience of description, and only describes the former situation, that is, each segmented transmitting coil is assumed to be composed of wires with the same size, the same number of turns, and the same interval, and each segmented transmitting coil is evenly spaced. Longitudinal distribution, that is, the segmented energy transmitting coil designed by the present invention is composed of several helical antennas with the same number of turns and the same interval (each individual helical antenna is called a segmented transmitting coil), and the space between each segmented energy transmitting coil interval is the same.

When working, the control unit will select one of the segmented transmitting coils to complete wireless energy transmission according to the position of the energy receiving end. When the height and radius of the wireless energy transmitting antenna to be designed are constant, the selection basis of the segment number P of the wireless energy transmitting antenna is to maximize the coupling coefficient in the worst case, and the worst case is shown in Figure 1(c). That is, the receiving coil at the energy receiving end is located at the intersection (A and B) of the axis of the segmented transmitting coil and its two end faces. The calculation of the coupling coefficient between one segmented energy transmitting coil and the receiving coil is shown in formula (1-4).

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}}{\sqrt{{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, M ₂₁ is the mutual inductance between the segmented energy transmitting coil and the receiving coil, L _T and _LR are the self-inductances of the segmented energy transmitting coil and the receiving coil respectively, and the parameters of the segmented energy transmitting coil and receiving coil are defined in the table 1.

Table 1. Parameter definitions of transmitting energy transmitting coil and receiving coil

parameter definition R&r The radius of segmented energy transmitting coil and receiving coil is 6 --> N _T &n The number of turns of segmented energy transmitting coil and receiving coil H _T & h _R The height of segmented energy transmitting coil and receiving coil P Number of Segments for Segmented Energy Transmitting Coils h The height of each coil segment in the segmented energy transmitting coil N The number of turns of each segment coil in the segmented energy transmitting coil μ ₀ μ _r Permeability

For the calculation of M ₂₁ , L _T and _LR , as shown in formula (2):

${\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}}{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; T</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 0.9</span>}\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; no</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 0.9</span>}\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; h</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, φ ₂₁ is the magnetic flux generated by the transmitting coil in the receiving coil, and I _R is the current in the transmitting coil. For the calculation of φ ₂₁ , there is an approximate calculation process of formula (3).

$\begin{array}{c}{\mathrm{<span\; class="notranslate">\; \&phi;</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; n\&pi;r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; n\&pi;r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; d</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; \&ap;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; n\&pi;r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\underset{\mathrm{<span\; class="notranslate">\; 0</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{<span\; class="notranslate">\; \&Integral;</span>}}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; x</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>}^{\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}}}\mathrm{<span\; class="notranslate">\; dx</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; n\&pi;r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; N</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}\end{array}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Substituting formula (2~3) into formula (1), we can get:

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; \&ap;</span>\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}\mathrm{<span\; class="notranslate">\; \&pi;r</span>}\sqrt{\mathrm{<span\; class="notranslate">\; 0.9</span>}\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; h</span>}}_{\mathrm{<span\; class="notranslate">\; R</span>}}}\sqrt{\mathrm{<span\; class="notranslate">\; 0.9</span>}\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; h</span>}}}{\mathrm{<span\; class="notranslate">\; 8</span>}{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\sqrt{\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

From the formula (4), it can be obtained that when H=0.445R, the coupling coefficient k can obtain the maximum value. In practical applications, the optimal number of segments when the total height is H _T is If the resulting number of segments P _opt is a non-integer number, there are two solutions: ① If the energy transmitting coils are divided into cases of the same length, the optimal number of segments P _opt needs to be rounded, namely Among them, the operation intx is to take the integer closest to x; ②If the energy transmitting coils are divided into situations where the lengths are not exactly the same, then there is a need A segmented transmitting coil whose length is H=0.445R, where the operation In order to take the largest integer smaller than x, and a special segmented transmitting coil whose length is H ₂ =H _T -0.445R·P _opt2 , as for the position of the special length transmitting coil, you can choose any position or simply place it on top.

For the selection of the number of turns of each segmented energy transmitting coil, there is a compromise as follows: on the premise that the operating frequency is not determined, the smaller the interval between the inner turns of each segmented wireless energy transmitting coil, the better (that is, the energy The transmission efficiency is higher), but as the turn spacing decreases, the number of turns of the segmented wireless energy transmitting coil will increase accordingly, resulting in an excessive weight of the energy transmitting coil and an excessive burden on the patient, so the total turns of the transmitting coil The upper limit is limited by the total coil weight.

As shown in Figure 1(d), the total height of the segmented energy transmitting coil is H _T and the total number of turns is _NT . When the energy receiving end is located at the A end of the coil, the contribution of the coil at the far end B end to the energy receiving end Relatively small, but the magnetic field energy of the segmented energy transmitting coil is evenly distributed in the entire coil, which will cause unnecessary waste of energy, so a method that can save energy is proposed based on the above considerations: during the work process, Control the coils that are far away from the energy receiving end to not work, so that the magnetic field energy is concentrated in the coils that are close to the energy receiving end. Such a centralized energy supply will improve the energy transmission efficiency. _NT The turn transmitting coil is divided into P segments, and a corresponding segment is selected according to the position of the energy receiving end. For example, when the total height of the energy transmitting coil is 30cm, the diameter is 40cm, the number of turns is 45, and the wire diameter is 2.2mm, the energy transmitting coil is evenly divided into 3 sections, each section has 15 turns, and only air is used as the medium. When the power is the same as 1W, the magnetic field strength of the segmented wireless energy transmitting antenna (that is, the segmented helical antenna) is compared with that of the non-segmented energy transmitting antenna (the non-segmented helical antenna) as shown in Table 2 (The magnetic field energy is proportional to the square of the magnetic field strength). By comparison, it can be seen that the average magnetic field energy of the segmented scheme is 62.8% higher than that of the unsegmented scheme.

Table 2 Efficiency comparison between segmented and non-segmented cases

Minimum Magnetic Field Strength (A/m) Average Magnetic Field Strength (A/m) Maximum Magnetic Field Strength (A/m) Segmentation 14.24 19.05 33.34 Unsegmented case 9.599 14.93 18.98

In the actual test (normal saline environment), the AC-AC transmission efficiency that can be obtained by using the segmented energy transmitting coil is: the highest 26.1%, the average 8.92%, the lowest 5.09% (the hollow receiving coil is 1.5cm in height, 1cm in diameter, The number of turns is 27, the wire diameter is 0.5mm), the highest is 49.2%, the average is 44.3%, and the lowest is 38.7% (the height of the receiving coil containing the Mn-Zn ferrite core is 1.6cm, the diameter is 1cm, and the number of turns is 29, Litz wire with an outer diameter of 0.5mm (Φ0.07mm×27 turns). When the conversion efficiency of the power amplifier and rectifier can reach more than 90%, and the power consumption of the energy receiving end in the body is 50mW, the average transmitting power required by the external transmitting end is <1W (hollow receiving coil), so that the entire energy transmitting end can be It is powered by a lithium battery (10.8V×5.4Ah) similar to a laptop battery for more than 8 hours.

The core idea of the segmented wireless energy supply is: as the position of the energy receiving end changes, select the segmented energy transmitting coil closest to the energy receiving end to supply energy, so that the coupling coefficient between the segmented energy transmitting coil and the receiving coil to reach the maximum. In specific implementation, the segmented energy transmitting coil can be wound on the clothes worn by the human body, or directly made together with the clothes, as shown in Figure 1(a). Assume that the energy receiving end is located in the area surrounded by the segmented energy transmitting coil 2 at the beginning, and the segmented energy transmitting coil 2 is the working coil, but as the detection time goes on, the energy receiving end will move to the area surrounded by the segmented energy transmitting coil 3. In the surrounding area, such a position transfer requires the selection of the segmented energy transmitting coil 3 as the working coil, that is, the principle of using the segmented energy transmitting coil closest to the energy receiving end for wireless energy transmission to improve the efficiency of wireless energy transmission.

The positioning subunit will locate the energy receiving end every time t, and the position coordinates at least include the range of the segmented transmitting coil where the energy receiving end is located, as a basis for switching the segmented transmitting coil. The control unit generates corresponding control signals according to the position coordinates, and controls the multiplexing unit to connect the segmented transmitting coil 3 with the power amplifier, so as to achieve the best transmission efficiency.

Corresponding to the above system and its actions, the wireless energy transmission method of this embodiment is shown in Figure 1(e), including the following steps:

(1) The positioning subunit obtains the position coordinates of the energy receiving end relative to the segmented energy transmitting coil every time t, and judges whether the energy receiving end is within the range of the lowermost segmented energy transmitting coil: if so, go to step (3); if no, go to step (2).

(2) The control unit determines the segmented transmitting coil closest to the energy receiving end according to the position coordinates, and the control unit generates control information for controlling the multiplexing unit, and the multiplexing unit completes the segmental energy transmission closest to the energy receiving end The coil is selected so that the segmented energy transmitting coil closest to the energy receiving end works, and step (1) is performed.

(3) The lowermost segmented energy transmitting coil is used as the current coil, and the current coil is kept working until the set time, and then the process is ended.

Example 2

As shown in Figure 2(a), the difference between this embodiment and Embodiment 1 is: the energy transmitting end does not have a positioning subunit, but a wireless data receiving subunit is added, and the energy receiving end needs to contain an energy acquisition unit and a wireless Data sending unit. The wireless data receiving subunit outside the body and the wireless data sending unit inside the body can be shared with the wireless transceiver system originally contained in the movable implantable system (such as the wireless capsule system), and only need to transfer the wireless energy intensity data and the energy receiving The data to be transmitted at the end can be integrated and transmitted together.

Assume that the energy receiving end is initially located in the area surrounded by the segmented energy transmitting coil 2, and the segmented transmitting coil 2 is the working coil. However, as the detection time goes by, the energy receiving end will move to the area surrounded by the segmented transmitting coil 3 or coil 1. The surrounding area (the intestine may float up and down, because there is no positioning, the situation must be taken into account), which requires the ability to switch the corresponding segmented energy transmitting coils in real time. In the absence of the position coordinates of the energy receiving end, at intervals t, the segmented transmitting coils adjacent to the upper and lower sides of the current working coil are quickly switched, and then the segmented transmitting coils that can receive relatively large energy are selected. The segmented transmitting coil is the segmented transmitting coil closest to the energy receiving end. The control unit generates corresponding control signals, and controls the multiplexing unit to connect the nearest transmitting coil with the power amplifier, so as to achieve the best transmission efficiency of the system.

Corresponding to the above-mentioned system and switching mode 1, the wireless energy transmission method of this embodiment is shown in Figure 2(b), and includes the following steps:

(1) The control unit randomly selects any segmented energy transmitting coil except the uppermost segmented energy transmitting coil and the lowermost segmented energy transmitting coil as the current coil J.

(2) After the working time t of the current coil J, judge whether the current coil J is the uppermost segmental energy transmitting coil, if so, directly switch to coil J+1, and go to step (3), otherwise switch to coil J -1, make a choice based on energy feedback: if the energy increases, select coil J-1 as the working coil, and go to step (4); if the energy decreases, switch to coil J+1, and go to step (3) .

(3) Make a choice based on energy feedback: if the energy increases, select coil J+1 as the working coil, and go to step (4); if the energy decreases, coil J continues to be the working coil, and go to step (2 ).

(4) Record the working coil as the current coil J, and judge whether the current coil J is the lowermost segmental energy transmitting coil: if yes, keep the current coil working until the set time, and then end the process; if not, then Go to step (2).

Example 3

As shown in Figure 3(a), the difference between this embodiment and Embodiment 2 is that each segmented energy transmitting coil is equipped with a capacitor that resonates with it, so that two There are two segmented energy transmitting coils, and the currents in the two segmented transmitting coils need to maintain the same phase. The change of the access coil makes its impedance change, so its impedance matching network needs to be adjusted accordingly. As shown in Figure 3(b), there are two kinds of matching networks. When accessing a single segmented transmitting coil, the control unit connects the "matching network when a single segmented transmitting coil works" between the power amplifier and the multiplexing unit; when accessing two segmented transmitting coils, the control unit Connect the "matching network when the two segmented transmitting coils work" between the power amplifier and the multiplexing unit. And the control unit controls the connection between the multiplexing unit and the segmented energy transmitting coils, so that the energy of the power amplifier can be transmitted to each segmented transmitting coil through the corresponding matching network. Assume that the energy receiving end is initially located in the area surrounded by the segmented energy transmitting coil 2, and the segmented energy transmitting coil 2 is the working coil. However, as the detection time goes by, the energy receiving end will move to the segmented energy transmitting coil 3 or coil 1 (the intestinal tract may float up and down, since there is no positioning, the situation must be taken into account), which requires switching to the corresponding segmented energy transmitting coil. In the absence of position coordinates, at intervals t, try two segmental energy transmitting coils (coil 1, coil 3) adjacent to the current working coil 2, that is, let coil 1, coil 3 and the current working coil respectively The coils 2 work at the same time, and judge which coil contributes the most according to the received energy, and this coil is the segmental energy transmitting coil closest to the energy receiving end. The control unit generates corresponding control signals to control the multiplexing unit to connect the optimal segmented transmitting coil with the power amplifier. In addition, for the segmented energy transmitting coil in Embodiment 2, either the structure in 2(a) or the structure in 3(a) can be used. In this scenario, the method of simultaneously connecting two segmented energy transmitting coils avoids the disadvantage of instantaneous power failure of the system when a single energy transmitting coil is switched as in Embodiment 2.

Corresponding to the above system and switching mode, the wireless energy transmission method of this embodiment is shown in Figure 3(c), and includes the following steps:

(1) The control unit randomly selects any segmented energy transmitting coil except the uppermost segmented energy transmitting coil and the lowermost segmented energy transmitting coil as the current coil J

(2) Make coil J and coil J-1 work simultaneously after the working time t of current working coil J, and go to step (3).

(3) Make a choice based on energy feedback: if E _j,j-1 /E _j ≥ 1 (E _j is the wireless energy intensity data received when coil J is working, E _j,j-1 is coil J and coil J -1 wireless energy intensity data received when working at the same time), then let the coil J-1 be the working coil, and go to step (4); if E _j,j-1 /E _j <1, then go to step ( 5).

(4) Make a choice based on energy feedback: if E _j-1 /E _j ≥ 1 (E _j-1 is the wireless energy intensity data received when coil J-1 is working), let coil J-1 be the working coil , and go to step (8); if E _j-1 /E _j <1, continue to let coil J be the working coil, and go to step (8).

(5) Make coil J and coil J+1 work at the same time, and obtain E _j,j+1 (E _j,j-1 is the received wireless energy intensity data when coil J and coil J+1 work at the same time).

(6) Make a choice based on energy feedback: if E _j,j+1 /E _j ≥ 1, select coil J+1 as the working coil, and go to step (7); if E _j,j+1 /E _j <1, then the coil J continues to be the working coil, and go to step (2).

(7) Make a choice based on energy feedback: if E _j+1 /E _j ≥ 1 (E _j+1 is the wireless energy intensity data received when coil J+1 is working), let coil J+1 be the working coil , and go to step (8); if E _j+1 /E _j <1, continue to let coil J be the working coil, and go to step (2).

(8) The current working coil is recorded as J. If the current coil is the lowermost segmented transmitting coil, keep the current coil working until the set time; if the current coil is not the lowermost segmented transmitting coil, go to step (2) .

Example 4

As shown in Figure 4(a), the difference between this structure and the previous embodiments 1, 2, and 3 is that the system includes both the positioning subunit and the wireless data receiving subunit, and the switching method of the segmented energy transmitting coil is also Change accordingly. In application, the position coordinates are first used. However, when positioning errors may lead to inaccurate judgments, for example, when the energy receiving end moves to a position between the two coils, it is necessary to use the energy information fed back from the energy receiving end. Judging whether the energy is sufficient, such two judgments make the system more reliable.

The positioning subunit will locate the energy receiving end every time t. The position coordinates include which coil range and position the energy receiving end is located in (inside or edge of the segmented energy transmitting coil). Since the current positioning error is <1cm, set The height of the edge is 1cm, then the space surrounded by the segmented transmitting coil except the upper and lower edges is the interior, as shown in Figure 4(b), in the longitudinal section view of the segmented energy transmitting coil, the segmented transmitting coil 1 is taken as The example is divided into regions. Assume that the energy receiving end is located in the area surrounded by the segmented energy transmitting coil 2, and the segmented energy transmitting coil 2 is the working coil. However, as the detection time goes by, the energy receiving end will move to the area surrounded by the segmented energy transmitting coil 3 , such a position transfer, it is necessary to select the segmented energy transmitting coil 3 as the working coil, the control unit generates a corresponding control signal according to the position information, and controls the multiplexing unit to connect the segmented energy transmitting coil 3 with the power amplifier to achieve the system have the best transmission efficiency. But when the energy receiving end is positioned at the position between segmented energy transmitting coils 2 and 3 (that is, the area formed by the adjacent edges of the two coils), errors may occur in the positioning, and at this time it is necessary to use the energy receiving end according to the feedback from the energy receiving end. The energy information is checked. If the energy information shows that the received energy increases after the switching is completed according to the positioning information, it means that the switching is valid; if the energy information shows that the energy decreases, it means that there is an error in the positioning information (the premise is The end will not be transferred in a large range in a short time, so the energy receiving end must be located in the coil before switching or to be switched), and it is necessary to continue to use the segmented energy transmitting coil before switching.

Corresponding to the above system and its actions, the wireless energy transmission method of this embodiment is shown in Figure 4(c), including the following steps:

(1) The positioning subunit obtains the position coordinates of the energy receiving end relative to the segmented energy transmitting coil every time t, and judges whether the energy receiving end is within the range of the lowest coil: if yes, go to step (4); if If not, go to step (2).

(2) The control unit controls the multi-channel selection unit to complete the switching of segmental energy transmitting coils according to the position coordinates, and executes step (3).

(3) If the positioning information is the inside of the segmented coil, perform step (1); if the position information is the edge of the segmented energy transmitting coil, then compare the received wireless energy intensity data before and after switching the segmented energy transmitting coil: if If the energy decreases after switching, continue to use the segmented energy transmitting coil before switching, and perform step (1); if the energy increases after switching, perform step (1).

(4) Keep the bottom coil running for the set time, and then end the process.

Example 5

As shown in Figure 5(a), the difference between this embodiment and Embodiment 4 is that each group of wireless segmented energy transmitting coils is equipped with a capacitor that resonates with it, so that when the multiplexer is trying to switch, Just can connect one, two, or a plurality of segmental energy transmitting coils. The core idea is that no matter where the energy receiving end is located, try to make it in the middle of multiple segmented energy transmitting coils, or let it be in the middle of the overall coil composed of multiple segmented energy transmitting coils, so that the segmented energy transmitting coil The coupling coefficient of the worst case between the receiving coil and the receiving coil can reach the maximum. Since the segmented energy transmitting coil cannot be moved with the position change of the energy receiving end, it is selected to respond to the multi-group segmented transmitting coil with the position change of the energy receiving end. control. Introduce two coil switching methods based on the above ideas: first, when the energy receiving end is located in the middle of a transmitting coil, select the corresponding single group segmented energy transmitting coil to work; when the energy receiving end is located in the middle of the two coils , select the corresponding two coils to work; the second type, when the energy receiving end is located in the middle of the uppermost or lowermost segmented energy transmitting coil, only select the corresponding single group segmented energy transmitting coil to work, when the energy receiving end When it is in the middle of other single coils, select the current coil and the two sets of segmented energy transmitting coils adjacent to it to work at the same time. When the energy receiving end is located in the middle of the two coils, select the corresponding two segmented energy transmitting coils. The coil works. The main difference between the two methods is, when the energy receiving end is located in the middle of the single-group segmented energy transmitting coil, whether to choose the single-group segmented energy transmitting coil or the three transmitting coils to work. The change of the access coil makes its impedance change, so its impedance matching network needs to be adjusted accordingly. As shown in Figure 5(b), there are three kinds of matching networks. When connecting to a single segmented transmitting coil, the control unit connects the "matching network when a single group of segmented energy transmitting coil works" between the power amplifier and the multiplexing unit; when connecting to two segmented transmitting coils, The control unit connects the "matching network when two sets of segmented energy transmitting coils work" between the power amplifier and the multiplexer unit; when connecting three segmented energy transmitting coils, the control unit The matching network when the transmitting coil is working" is connected between the power amplifier and the multiplexing unit, and the control unit controls the connection between the multiplexing unit and the segmented energy transmitting coil, so that the energy of the power amplifier can be transmitted to the power amplifier through the corresponding matching network. Each segmented energy transmitting coil and the current of each segmented energy transmitting coil maintain the same phase. When switching the segmented energy transmitting coils, it may be based only on the position coordinates, or only based on the wireless energy intensity data, or a combination of the two.

The longitudinal section of the segmented energy transmitting coil is shown in Figure 5(c). The serial number of the uppermost segmented energy transmitting coil is 1, and the serial number of the lowermost segmented energy transmitting coil is P, and the space is divided into different sections in the vertical direction. area. Assume that the energy receiving end is initially located in the middle area Z ₁ of the segmented energy transmitting coil 1 (in order to ensure that the system has a sufficient will move to the edge of coil 1 and coil P), the segmented transmitting coil 1 is the working coil, but as the detection time goes on, the energy receiving end will move to the zone Z _{1&2 between the segmented transmitting coil 1 and coil 2} ( The middle area between the two adjacent coils is the area composed of the lower 1/4 part of the upper coil and the upper 1/4 part of the lower coil), at this time, the segmented transmitting coil 1 and coil 2 need to work at the same time. The advantages can be obtained from Table 3. When the energy receiving end is located in the lower 1/4 region of a single segmented transmitting coil (such as Z _1&2 ), the minimum and average values of the magnetic field strength generated by a single coil are better than those of two segments The magnetic field intensity generated by the transmitting coil is low, and using two segmented transmitting coils to work simultaneously can make the magnetic field intensity consistency in the Z _1&2 area better; when the energy receiving end moves to the middle area Z ₂ of the coil 2 (the middle of a coil area is the middle area which accounts for 1/2 of the total space of the coil), whether the coil 2 needs to work alone or the segmented transmitting coil 1, coil 2, and coil 3 need to work at the same time, the conclusion can be drawn from Table 4, it can be seen that the three coils can work at the same time The minimum magnetic field strength is slightly improved, but the average magnetic field strength is not as good as that of a single segmented transmitting coil. The two application methods have their own advantages, so in this case, you can choose a single segmented transmitting coil to work, or you can choose three segments. The segment transmitting coils work at the same time. Considering the practical application, the system may transmit wireless energy with the power that meets the minimum transmission efficiency. Therefore, in this embodiment, when the energy receiving end is located in the middle of the segment transmitting coil, the three segments are selected to be The scheme of transmitting coils working at the same time; when the coil moves to the area Z _{2 & 3} between coil 2 and coil 3, it is necessary to segment the transmitting coil 2 and coil 3 to work simultaneously; other situations can be analogized as above.

Table 3 Magnetic field energy comparison between a single segmented coil and two segmented coils in zone Z _1&2

Minimum magnetic field strength Average magnetic field strength Maximum magnetic field strength Single segmented transmit coil operation 14.24(A/m) 18.42(A/m) 32.40(A/m) Two segmented transmitting coils work simultaneously 15.59(A/m) 18.57(A/m) 23.68(A/m)

Table 4 Comparison of magnetic field energy between a single segmented coil and three segmented coils in zone Z2

Minimum magnetic field strength Average magnetic field strength Maximum magnetic field strength Single Segmented Transmit Coil Operation 14.24(A/m) 19.35(A/m) 33.1(A/m) Three segmented transmitting coils work simultaneously 14.91(A/m) 16.38(A/m) 18.93(A/m)

When only the positioning subunit is used, the positioning subunit will locate the energy receiving end every time t, and the position coordinates are the area of the coil where the energy receiving end is located, as the basis for switching coils. The control unit generates corresponding control signals according to the position information, and controls the multiplexing unit to connect the corresponding segmented transmitting coils with the power amplifier, so as to achieve the best transmission efficiency of the system. When only the wireless data transceiving unit is used, at intervals t, it will try to connect to the segmented transmitting coils adjacent to the upper and lower adjacent to the current working coil, and let one of them work at the same time as the current working coil. If the energy fed back If the information shows that the received energy has increased, the switching is correct. If the feedback energy information shows that the received energy has decreased or even no feedback, then the switching is wrong, and the current working coil needs to continue to work alone. When both the positioning subunit and the wireless data receiving subunit are used, the position coordinates are used first. When the positioning error may lead to inaccurate judgments, for example, when the energy receiving end moves to the dividing line between two areas, it is necessary to Whether the handover is valid is judged according to the energy information before and after the handover fed back from the energy receiving end, so that the two judgments make the system more reliable. In this embodiment, only the positioning subunit is used as an example for detailed description.

The wireless energy transmission method of this embodiment is shown in Figure 5(d), and includes the following steps:

(1) Initial judgment, whether the energy receiving end is located within the range of coil 1 (the uppermost coil) or P (the lowermost coil): if yes, perform step (2); if not, perform step (3).

(2) Locate the energy receiving end: if the energy receiving end is located in area Z ₁ or Z _P , let the corresponding coil work alone, and turn to step (4); if the energy receiving end is located in area Z _1&2 or Z _P-1&P ( between coil P-1 and coil P), let coil 1&2 or coil P-1&P work at the same time, and turn to step (4).

(3) The coil where the energy receiving end is located is marked as J, and the energy receiving end is positioned: if the energy receiving end is located in the middle area Z _J of the coil J (the middle area of the J coil is the middle area that occupies 1/2 of the total space of the coil ), let the coils J-1, J, J+1 work at the same time, and turn to step (4); if the energy receiving end is located in the area Z between coil J and J-1 or J+1 _J-1&J (J- 1 area consisting of the lower 1/4 part of the coil and the upper 1/4 part of the J coil), Z _J&J+1 (the area consisting of the lower 1/4 part of the J coil and the upper 1/4 part of the J+1 coil) , let coil J and J-1 or J+1 work simultaneously, and turn to step (4).

(4) After the working time t, judge whether the running time reaches the set time: if yes, end the process; if not, execute step (1).

In some embodiments, the position coordinates of the energy receiving end and the wireless energy intensity data can be used as the basis for energy power adjustment at the same time. The position coordinates of the energy receiving end can provide the direction of energy power adjustment (increase or decrease), and the wireless energy intensity data Feedback can be provided to make power regulation more precise and accurate, and the system more stable. And the interval between two adjacent power adjustments can be adjusted according to different situations.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (9)

1. An energy transmitting end, comprising: the device comprises a plurality of groups of segmented energy emitting coils, an energy supply unit, a multi-path selection unit, a position information acquisition unit and a control unit, wherein the position information acquisition unit, the control unit, the multi-path selection unit and the plurality of groups of segmented energy emitting coils are sequentially connected, the energy supply unit is respectively connected with the multi-path selection unit, the control unit and the position information acquisition unit,

the position information acquisition unit is used for acquiring the position information of the energy receiving end;

the control unit is used for receiving and controlling the multi-path selection unit according to the position information;

the multiplex unit is used for selecting at least one group of coils in the multiple groups of segmented energy transmitting coils to be communicated with the energy supply unit under the control of the control unit;

the multiple groups of segmented energy transmitting coils are used for transmitting wireless energy when being communicated with the energy supply unit so as to ensure the wireless transmission efficiency;

wherein when P is_optWhen the number of the energy transmitting coils is an integer, the heights H of each group of the segmented energy transmitting coils are the same;

when P is present_optWhen not an integer, the total height is H_TIs divided into P_opt1Group height ofThe segmented energy transmitting coil of (1); or, the total height is H_TIs divided into P_opt2Segmented energy transmitting coil with group height H and group height H₂The segmented energy transmitting coil of (1);

wherein,H_Tfor the total height of the energy-emitting coil, H is 0.445R, R is the radius of the energy-emitting coil, P_opt1＝int<P_opt>，int<x>To take the integer operator closest to x, for the round-down operator, H₂＝H_T-H·P_opt2。

2. The energy transmission terminal according to claim 1, wherein the position information acquisition unit includes: a positioning sub-unit and/or a wireless data receiving sub-unit,

the positioning subunit is used for acquiring the position coordinates of the energy receiving end;

and the wireless data receiving subunit is used for acquiring wireless energy intensity data of the energy receiving end.

3. The energy transmitting terminal according to claim 1 or 2, wherein the energy supply unit comprises: the power supply, the oscillator, the power amplifier, the impedance matching network and the resonance capacitor are sequentially connected, the power supply is connected with the control unit, the position information acquisition unit and the power amplifier respectively, and the resonance capacitor is arranged between the impedance matching network and the multi-path selection unit or between each group of segmented energy transmitting coils and the multi-path selection unit.

4. The energy transmitting terminal according to claim 3, wherein when the resonant capacitor is provided between the impedance matching network and the multiplexing unit, the number of the resonant capacitors is one; or the number of the resonance capacitors is the same as that of the coils of the multiple groups of segmented energy transmitting coils and corresponds to that of the coils of the multiple groups of segmented energy transmitting coils one by one.

5. A wireless energy transmission method based on the energy transmitting terminal of any one of claims 1-4, characterized in that the method comprises the following steps:

a1: the method comprises the steps that a position information acquisition unit acquires position coordinates of an energy receiving end every preset time t;

a2: the control unit judges whether the energy receiving end is positioned in the range of the lowermost segmented energy transmitting coil, if so, the step A4 is executed, otherwise, the step A3 is executed;

a3: the control unit determines the segmented energy transmitting coil closest to the energy receiving end according to the position coordinates, controls the multi-path selection unit to enable the segmented energy transmitting coil closest to the energy receiving end to be communicated with the energy supply unit so that the segmented energy transmitting coil closest to the energy receiving end works, and returns to the step A1;

a4: and taking the lowermost segmented energy emitting coil as a current coil, and finishing the process after keeping the current coil working for a set time.

6. A wireless energy transmission method based on the energy transmitting terminal of any one of claims 1-4, characterized in that the method comprises the following steps:

b1: the control unit randomly selects any segmented energy transmitting coil except the uppermost segmented energy transmitting coil and the lowermost segmented energy transmitting coil as a current coil J, the current coil J is communicated with the energy supply unit, and the position information acquisition unit acquires wireless energy intensity data E corresponding to the current coil J_j；

B2: after the current coil J works for a preset time t, judging whether the current coil J is the uppermost segmented energy transmitting coil, if so, executing a step B3, otherwise, switching the work of the current coil J to the work of a coil J-1 by the control unit, and acquiring wireless energy intensity data E corresponding to the current coil J-1 by the position information acquisition unit_j-1Comparison of E_jAnd E_j-1If E is_j-1>E_jExecuting step B4, otherwise executing step B3, the coil J-1 being a segmented energy emitting coil adjacent to and above the current coil J;

b3: the control unit is switched to work of a coil J +1, and the position information acquisition unit acquires wireless energy intensity data E corresponding to the current coil J +1_j+1Comparison of E_jAnd E_j+1If E is_j+1>E_jThen step B4 is executed, otherwise the control unit switches the operation of coil J +1 to coil J operation, and returns to step B2, the coil J +1 is adjacent to and located at the current coil JA segmented energy emitting coil below the current coil J;

b4: and recording the coil which is working as a current coil J, judging whether the current coil J is the lowest segmented energy transmitting coil, if so, keeping the current coil working for a set time, ending the process, and otherwise, returning to the step B2.

7. A wireless energy transmission method based on the energy transmitting terminal of any one of claims 1-4, characterized in that the method comprises the following steps:

c1: the control unit randomly selects any segmented energy transmitting coil except the uppermost segmented energy transmitting coil and the lowermost segmented energy transmitting coil as a current coil J, the current coil J is communicated with the energy supply unit, and the position information acquisition unit acquires wireless energy intensity data E corresponding to the current coil J_j；

C2: after the current coil J works for the preset time t, the control unit enables the current coil J and the coil J-1 to work simultaneously, and the position information acquisition unit acquires corresponding wireless energy intensity data E_j,j-1The coil J-1 is a segmented energy emitting coil adjacent to and above the current coil J;

c3: comparison E_jAnd E_j,j-1If E is_j,j-1/E_jIf the current position is more than or equal to 1, the control unit only enables the coil J-1 to work, and the position information acquisition unit acquires the corresponding wireless energy intensity data E_j-1And go to step C4, otherwise go to step C5;

c4: comparison E_jAnd E_j-1If E is_j-1/E_jIf not, executing the step C8, otherwise, the control unit only enables the coil J to work, and executing the step C8;

c5: the control unit enables the current coil J and the coil J +1 to work simultaneously, and the position information acquisition unit acquires corresponding wireless energy intensity data E_j,j+1The coil J +1 is a segmented energy emission adjacent to and below the current coil JA coil;

c6: comparison E_jAnd E_j,j+1If E is_j,j+1/E_jIf the current value is more than or equal to 1, the control unit only enables the coil J +1 to work, and the position information acquisition unit acquires corresponding wireless energy intensity data E_j+1And go to step C7, otherwise go to step C2;

c7: comparison E_jAnd E_j+1If E is_j+1/E_jIf not, executing the step C8, otherwise, the control unit only enables the coil J to work, and executing the step C2;

c8: and recording the coil which is working as a current coil J, judging whether the current coil J is the lowest segmented energy transmitting coil, if so, keeping the current coil working for a set time, ending the process, and otherwise, returning to the step C2.

8. A wireless energy transmission method based on the energy transmitting terminal of any one of claims 1-4, characterized in that the method comprises the following steps:

d1: the method comprises the steps that a position information acquisition unit acquires position coordinates of an energy receiving end every preset time t;

d2: the control unit judges whether the energy receiving end is positioned in the range of the lowermost segmented energy transmitting coil, if so, the step D6 is executed, otherwise, the step D3 is executed;

d3: the control unit determines a segmented energy transmitting coil closest to the energy receiving end according to the position coordinates, takes the segmented energy transmitting coil closest to the energy receiving end as a current coil, controls a multi-path selection unit to enable the current coil to be communicated with the energy supply unit so as to enable the current coil to work, and executes the step D4;

d4: the control unit determines whether the energy receiving end is located inside the current coil according to the position coordinates, if so, step D1 is executed, and if so, the position information acquiring unit acquires the corresponding non-coil areaLinear energy intensity data E₁And performing step D5;

d5: the control unit switches the current coil to work in another coil of the two adjacent segmented transmitting coils, and the position information acquisition unit acquires corresponding wireless energy intensity data E₂If E is₁≥E₂If so, the control unit switches the other coil operation to the current coil operation and returns to the step D1, otherwise, returns to the step D1;

d6: and taking the lowermost segmented energy emitting coil as a current coil, and finishing the process after keeping the current coil working for a set time.

9. A wireless energy transmission method based on the energy transmitting terminal of any one of claims 1-4, characterized in that the method comprises the following steps:

e1: the method comprises the steps that a position information acquisition unit acquires position coordinates of an energy receiving end every preset time t;

e2: the control unit judges whether the energy receiving end is positioned in the range of the uppermost segmented energy transmitting coil or the lowermost segmented energy transmitting coil, if so, the step E3 is executed, otherwise, the step E4 is executed;

e3: if the energy receiving terminal is located in the area Z₁Or Z_PThe control unit makes the corresponding coil 1 or coil P operate alone and performs step E5 if the energy-receiving end is located in the zone Z_1&2Or Z_P-1&PThen the control unit makes the corresponding coil 1 and coil 2 or coil P-1 and coil P work simultaneously, and executes step E5, the segmented energy transmitting coils have P groups in common and are respectively called coil 1, coil …, and coil P from top to bottom, and the region Z is₁For expanding the area formed between at least one turn and the top end of the coil 1 downwards from the middle of the coil 1, the area Z_PFor expanding the area formed between at least one turn and the bottom end of the coil P upward from the middle of the coil P, the area Z_1&2Is a region Z₁And zone Z₂Region betweenRegion Z_P-1&PIs a region Z_P-1And zone Z_PThe area in between;

e4: marking the coil where the energy receiving end is positioned as J, and if the energy receiving end is positioned in the area Z_JThen the control unit makes coil J-1, coil J and coil J +1 work simultaneously and executes step E5 if the energy receiving end is located in zone Z_J-1&JOr Z_J&J+1The control unit makes the corresponding coil J-1 and coil J or coil J and coil J +1 operate simultaneously and executes step E5, the zone Z_JA region formed by extending at least one turn upward and downward from the middle of the coil J, wherein J is 2, …, P-1, and the region Z_J-1&JIs a region Z_J-1And zone Z_JRegion Z between_J&J+1Is a region Z_JAnd zone Z_J+1The area in between;

e5: and after working for the preset time t, judging whether the preset time is reached, if so, ending the process, otherwise, returning to the step E1.