CN108736579A - Radio energy radiating circuit - Google Patents
Radio energy radiating circuit Download PDFInfo
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- CN108736579A CN108736579A CN201710263892.8A CN201710263892A CN108736579A CN 108736579 A CN108736579 A CN 108736579A CN 201710263892 A CN201710263892 A CN 201710263892A CN 108736579 A CN108736579 A CN 108736579A
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- 230000005540 biological transmission Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 24
- 238000005516 engineering process Methods 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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Classifications
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- H02J7/025—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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Abstract
Disclose a kind of radio energy radiating circuit, by substantially connecting one or more resonant branch in parallel or serial fashion on the transmitting coil of radio energy transmitting terminal, the resonant frequency of resonant branch is set to the frequency of issuable high-frequency harmonic electric current, thus, high-frequency harmonic electric current can be obstructed by concatenated resonant branch or be shunted by resonant branch in parallel, cannot enter transmitting coil.The radio energy radiating circuit of the disclosure can be effectively inhibited due to EMC Conduction Interferences and radiation interference caused by high-frequency harmonic electric current.
Description
Technical Field
The present disclosure relates to power electronics technologies, and more particularly, to a wireless power transmitting circuit for a magnetic resonance wireless power supply system.
Background
Wireless power supply technology can transfer power between electronic devices in a wireless manner, and thus is widely used in consumer electronics and other types of electronic products. Wireless power supply technology generally achieves wireless transmission of electric energy by mutual electromagnetic coupling of a transmitting side coil and a receiving side coil. The magnetic resonance type wireless power supply method can efficiently supply electric energy to a receiving end at a certain distance in a wireless mode. In this method, both the power transmitting end and the power receiving end are provided with a resonance circuit composed of a coil and a capacitor, which allows an electric field and a magnetic field to resonate between the two circuits to transmit power wirelessly.
As shown in fig. 1, the conventional wireless power supply system generally includes a power transmitting terminal 1 and a power receiving terminal 2. The power transmitting end includes an inverter circuit 11 and a transmitting coil 12. The transmitting coil 12 may be equivalent to a compensation capacitor Cs and a coil inductance Ls in series. The compensation capacitance Cs can be obtained by the parasitic capacitance of the coil itself, or by providing a special compensation element. The compensation capacitor Cs and the coil inductance Ls form a resonant circuit, which resonates at an operating frequency f0 (e.g., 6.78MHz of A4WP standard), thereby forming a coupling with the power receiving terminal 2. The power receiving terminal 2 includes a receiving coil 21 and a rectifying circuit 22. The receiving coil 21 may be equivalent to a compensation capacitor Cd and a coil inductance Ld. Both of which also form a resonant circuit that resonates at the operating frequency f0 so that the transmitted electrical energy may be coupled to the transmit coil. In an ideal situation, the current Is supplied to the transmitting coil by the inverter circuit 11 Is an alternating current with the operating frequency f 0. However, in practice, when the inverter circuit performs dc-ac conversion, high-frequency harmonic current is generated. These high frequency harmonic currents will be superimposed on the current Is flowing to the transmitting coil and radiate outwards through the transmitting coil 12, causing EMC radiation interference, affecting the operation of the electric energy transmitting terminal and the electric energy receiving terminal.
Meanwhile, as shown in fig. 2, when a high-frequency harmonic current flows through the transmitting coil, a high-frequency voltage jump to the ground is generated. The voltage jump forms a common-mode current ICMi to ground through the parasitic capacitance of the transmitting coil to ground, i being 1,2, … …, n. This can lead to EMC conducted interference.
Disclosure of Invention
In view of the above, the present disclosure provides a wireless power transmitting circuit to shield harmonic currents of a specific frequency or frequencies from entering a transmitting coil, and suppress EMC radiation interference and conduction interference.
The wireless power transmitting circuit of the present disclosure includes:
a transmitting coil configured to wirelessly transmit electrical energy at a predetermined operating frequency in resonance;
at least one resonant branch, connected with the transmitting coil, configured to resonate at a corresponding shielding frequency to prevent harmonic signals at the shielding frequency from being transmitted through the transmitting coil.
Preferably, the resonant branch comprises:
at least one first resonant branch, each for short-circuiting a subsequent circuit including the transmitting coil at a corresponding shielding frequency.
Preferably, the resonant branch comprises a plurality of first resonant branches;
wherein different first resonant legs are configured to resonate at different shielding frequencies.
Preferably, each of the first resonant branches is connected in parallel with the transmitting coil; or,
at least one of the first resonant branches is connected in parallel with a circuit formed by the transmitting coil and at least one other resonant branch.
Preferably, the first resonant branch comprises an inductance and a capacitance connected in series with each other.
Preferably, the resonant branch comprises:
at least one second resonant branch, each of the second resonant branches for blocking current at a corresponding shielding frequency from flowing to a subsequent circuit including the transmit coil.
Preferably, the resonant branch comprises a plurality of second resonant branches;
wherein the different second resonant legs are configured to resonate at different shielding frequencies.
Preferably, the plurality of second resonance branches are connected in series with each other.
Preferably, at least one of said second resonant branches is connected in series with the circuit formed by the transmitting coil and at least one other resonant branch.
Preferably, the second resonant branch or a circuit formed by a plurality of second resonant branches connected in series with each other is disposed in a current path of the transmitting coil.
Preferably, each of the second resonant branches includes an inductor and a capacitor connected in parallel with each other.
Preferably, the wireless power transmitting circuit further includes:
the impedance matching network is connected with the transmitting coil and comprises an inductor and a capacitor;
wherein the second resonant branch and the impedance matching network share the inductance.
By connecting one or more resonance branches to the transmitting coil of the wireless power transmitting terminal in a substantially parallel or series manner, the resonance frequency of the resonance branch is set to the frequency of a high-frequency harmonic current that may be generated, whereby the high-frequency harmonic current may be blocked by the series resonance branch or shunted by the parallel resonance branch, and may not enter the transmitting coil. The wireless power transmitting circuit of the present disclosure can effectively suppress EMC conducted interference and radiated interference due to high frequency harmonic current.
Drawings
FIG. 1 is a circuit block diagram of a prior art wireless power supply system;
FIG. 2 is a schematic diagram of the generation of common mode currents in the transmit coils;
fig. 3 is a circuit block diagram of a wireless power transmission circuit of a first embodiment of the present disclosure;
fig. 4 is a circuit diagram of a preferred implementation of a wireless power transmitting circuit of a first embodiment of the present disclosure;
fig. 5 is a circuit diagram of another preferred implementation of a wireless power transmitting circuit of the first embodiment of the present disclosure;
fig. 6 is a circuit block diagram of a wireless power transmitting circuit of a second embodiment of the present disclosure;
fig. 7 is a circuit diagram of a preferred implementation of a wireless power transmitting circuit of a second embodiment of the present disclosure;
fig. 8 is a circuit diagram of another preferred implementation of a wireless power transmitting circuit of a second embodiment of the present disclosure;
fig. 9 is a circuit block diagram of a wireless power transmitting circuit of a third embodiment of the present disclosure;
fig. 10 is a circuit block diagram of a wireless power transmitting circuit of a fourth embodiment of the present disclosure;
fig. 11 is a circuit block diagram of a wireless power transmitting circuit of a fifth embodiment of the present disclosure;
fig. 12 is a circuit block diagram of a wireless power transmitting circuit of a sixth embodiment of the present disclosure;
fig. 13 is a circuit diagram of a preferred embodiment of the present disclosure.
Detailed Description
Several preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, but the present disclosure is not limited to only these embodiments. The present disclosure covers any alternatives, modifications, equivalents, and alternatives that fall within the spirit and scope of the present disclosure. In the following description of the preferred embodiments of the present disclosure, specific details are set forth in order to provide a thorough understanding of the present disclosure, and it will be apparent to those skilled in the art that the present disclosure may be practiced without these specific details.
The term "comprising" as used in the claims should not be interpreted as a limitation of the means listed thereafter. It does not exclude other elements or steps. Thus, the scope of the expression "a device comprising means a and B" should not be limited to devices comprising only components a and B. It is meant that for the purposes of this disclosure, the relevant components of the device are a and B.
Furthermore, the terms first, second, third and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the disclosure described herein are capable of operation in other sequences than described or illustrated herein.
It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements should be understood in the same manner (i.e., "with and directly between," "adjacent" with "directly adjacent," etc.).
Fig. 3 is a circuit block diagram of a wireless power transmitting circuit of a first embodiment of the present disclosure. As shown in fig. 3, the wireless power transmitting circuit of the present embodiment includes a transmitting coil 3 and at least one first resonant branch 4 connected in parallel with the transmitting coil 3. Wherein the transmitting coil 3 may be a spiral wire or a metal pattern substantially in one plane, which may be equivalent to the compensation capacitance Cs and the coil inductance Ls. The two form a resonant circuit, and resonate at the working frequency f0, so as to transmit electric energy to the outside in a wireless mode. In the present embodiment, the first resonant branch 4 is a series resonant circuit, i.e. comprises an inductance and a capacitance connected in series with each other. The resonance frequency of the first resonant branch 4 is set to one or more shielding frequencies fx 1-fxn. The shielding frequencies fx1-fxn correspond to the high frequency harmonic currents Ix1-Ixn, respectively, of the different frequencies that it is desired to shield. The masking frequencies fx1-fxn can be obtained by experimental testing before designing the circuit.
Fig. 4 is a circuit diagram of a preferred embodiment of the wireless power transmitting circuit of the present embodiment. The wireless power transmitting circuit is provided with only one first resonant branch 41, which is connected to two ends of the transmitting coil 3 and forms a parallel relation with the transmitting coil 3 relative to the output port of the inverter circuit. The first resonant branch 41 is a series resonant circuit, and includes an inductor Lx and a capacitor Cx connected in series. The parameters of the inductance Lx and the capacitance Cx are selected such that the first resonant branch 41 resonates at the corresponding shielding frequency fx. For a harmonic current Ix of frequency fx, the series impedance of the first resonant branch 41 is zero, which short-circuits the transmitting coil 3 in parallel therewith. Thereby, the current Ix flows back through the first resonant branch 41 without flowing to the transmitting coil 3. The harmonic current Ix at the shielding frequency fx in the current Is flowing to the transmitter coil 3 Is filtered out, so that no EMC conducted interference or radiated interference Is caused. At the same time, since the resonance frequency of the transmitting coil 3 Is the operating frequency f0, its impedance with respect to the current Is zero or close to zero, while the first resonance branch 41, whose resonance frequency fx Is higher than the operating frequency f0, presents a high impedance to the current Is. Therefore, the current Is does not flow into the first resonant branch 41. The first resonant branch 41 does not shunt the current Is, and the normal outward transmission of electric energy by the transmitting coil 3 Is not affected.
Further, harmonic signals causing EMC disturbances will typically occur at multiple frequencies, and therefore, multiple first resonant legs 41-4n may be provided to shunt harmonic currents Ix1-Ixn at multiple different shielding frequencies fx 1-fxn. Fig. 5 is a circuit diagram of another preferred embodiment of the wireless power transmitting circuit of the present embodiment. As shown in fig. 5, the plurality of first resonance branches 41-4n are connected in parallel with the transmitting coil 3, that is, the plurality of first resonance branches 41-4n are connected to both ends of the transmitting coil 3 in a mutually parallel manner. Each first resonant branch 4i corresponds to a shielding frequency fxi at which it resonates, so that the impedance of the first resonant branch 4i to the harmonic current Ixi having the corresponding shielding frequency fxi is zero, short-circuiting the other circuits connected in parallel thereto. Thus, each first resonant branch 41i can shunt the harmonic current Ixi at the corresponding shielding frequency, so that the harmonic current components at the shielding frequencies fx1-fxn do not flow to the transmitting coil 3, thereby suppressing the EMC conducted interference and radiated interference caused by the harmonic signals. In fig. 5, the first resonant branches 41-4n are also each a series resonant circuit, each first resonant branch 4i comprising an inductance Lxi and a capacitance Cxi in series. By setting the parameters of the inductance Lxi and the capacitance Cxi, the resonance frequency of the first resonance branch 4i can be set or adjusted.
Fig. 6 is a circuit block diagram of a wireless power transmitting circuit of a second embodiment of the present disclosure. In the present embodiment, a parallel resonant circuit is provided in front of the transmitting coil 3 to block the harmonic signal. As shown in fig. 6, the wireless power transmitting circuit of the present embodiment includes a transmitting coil 3 and at least one second resonant branch 5 connected in series with the wireless transmitting coil 3. Wherein the transmitting coil 3 may be a spiral wire or a metal pattern substantially in one plane, which may be equivalent to the compensation capacitance Cs and the coil inductance Ls. The two form a resonant circuit, and resonate at the working frequency f0, so as to transmit electric energy to the outside in a wireless mode. In this embodiment, the second resonant branch 5 is a parallel resonant circuit, and includes a capacitor and an inductor connected in parallel with each other. The resonance frequency of the second resonant branch 5 is set to one or more shielding frequencies fx 1-fxn. The shielding frequencies fx1-fxn correspond to the high frequency harmonic currents Ix1-Ixn at different frequencies, respectively. The masking frequencies fx1-fxn can be obtained by experimental testing before designing the circuit.
Fig. 7 is a circuit diagram of a wireless power transmitting circuit of the present embodiment. Wherein the radio energy transmission circuit is provided with only one second resonant branch 51. Which is connected in series relationship with the transmitter coil 3 in the current path of the transmitter coil 3. The second resonant branch 51 is a parallel resonant circuit, and includes an inductor Lx and a capacitor Cx connected in parallel. The second resonant branch 51 can be made to resonate at the corresponding shielding frequency fx by setting the parameters of the inductance Lx and the capacitance Cx. For a harmonic current Ix of frequency fx, the impedance of the second resonant branch 51 is infinite. The harmonic current Ix will be blocked by the second resonant branch 51 from entering the transmitting coil 3 in the subsequent circuit. And thus does not cause EMC conducted interference and radiated interference. Meanwhile, since the designer desires the frequency of the current Is flowing into the transmitting coil to be the operating frequency f 0. The operating frequency f0 is lower than the masking frequency fx. When the current Is passes through the second resonant branch 51, the inductor Lx presents a low impedance, and the second resonant branch 51 does not block the current of the frequency, so that the normal outward transmission of the electric energy by the transmitting coil 3 Is not affected.
Further, harmonic signals causing EMC interference will typically occur at multiple frequencies, and therefore, multiple second resonant legs 51-5n may be provided to block harmonic currents Ix1-Ixn at multiple different shielding frequencies fx 1-fxn. Fig. 8 is a circuit diagram of another preferred embodiment of the wireless power transmitting circuit of the present embodiment. As shown in fig. 8, a plurality of second resonant branches 51-5n are connected in series with each other. The circuit formed by the series connection is connected to the current path of the transmitting coil 3. Each second resonant branch 5i corresponds to a shielding frequency fxi at which it resonates. The impedance of the second resonant branch 5i to the harmonic current Ixi with the corresponding shielding frequency fxi is infinite. The harmonic current Ixi is blocked by the second resonant branch 5i from entering the transmitting coil 3. The second resonance branches 51-5n connected in parallel correspond to a plurality of different shielding frequencies fx1-fxn, so that harmonic currents Ix1-Ixn of corresponding frequencies are blocked from entering the transmitting coil 3, and EMC conducted interference and radiation interference caused by harmonic signals are suppressed. In fig. 8, the second resonant branches 51-5n are also all parallel resonant circuits, each second resonant branch 5i comprising an inductance Lxi and a capacitance Cxi connected in parallel. By setting the parameters of the inductance Lxi and the capacitance Cxi, the resonance frequency of the second resonance branch 5i can be set or adjusted.
Meanwhile, the first resonance branch and the second resonance branch can be simultaneously applied to the wireless power transmitting circuit of the present disclosure to better suppress harmonic signals from entering the transmitting coil.
Fig. 9 is a circuit block diagram of a wireless power transmitting circuit of a third embodiment of the present disclosure. As shown in fig. 9, in the present embodiment, the wireless power transmitting circuit includes a transmitting coil 3, at least one first resonant branch 4 connected in parallel with the transmitting coil 3, and at least one second resonant branch 5 connected in a current path of a circuit formed by the transmitting coil 3 and the first resonant branch 4. When a plurality of first resonance branches exist, the first resonance branches are connected in parallel with each other. When a plurality of second resonance branches exist, the second resonance branches are connected in series with each other. The resonance frequency of the first resonant branch 4 is set to the shielding frequency and the resonance frequency of the second resonant branch 5 is also set to the shielding frequency. Thus, each first resonant branch 4 presents a zero impedance for currents having the corresponding shielding frequency, and each second resonant branch 5 presents a high impedance for currents having the corresponding shielding frequency. Thus, the first resonant branch 4 shunts the harmonic current Ix having the corresponding shielding frequency, and the second resonant branch 5 blocks the harmonic current Ix having the corresponding shielding frequency, so that the harmonic current which is not expected to enter the transmitting coil is prevented from entering the transmitting coil, and EMC conducted interference and radiated interference are suppressed. In this embodiment, one or more first resonant branches 4 may be provided, and one or more second resonant branches 5 may also be provided. The number of the two may be the same or different. When a plurality of first resonant branches 4 and a plurality of second resonant branches 5 are provided, the shielding frequency may be identical. For example, n first resonant branches 4 and n second resonant branches 5 are provided, the n first resonant branches 4 corresponding to the shielding frequencies fx1-fxn, respectively, and the n second resonant branches 5 also corresponding to the resonant frequencies fx1-fxn, respectively. Thereby, harmonic signals can be suppressed by means of double blocking. Alternatively, the shielding frequencies corresponding to the first resonant branches 4 and the shielding frequencies corresponding to the second resonant branches 5 may be different completely. For example, n first resonant branches 4 and m second resonant branches 5 are provided, n first resonant branches 4 corresponding to the shielding frequencies fx1-fxn and m second resonant branches 5 corresponding to the resonant frequencies fxn +1-fxn + m. Thereby, more shielding frequencies are covered by two different ways of resonant branches. Optionally, the shielding frequency corresponding to the plurality of first resonant branches 4 and the shielding frequency corresponding to the plurality of second resonant branches 5 may also be partially the same. For example, n first resonant branches 4 and m second resonant branches 5 are provided, n first resonant branches 4 corresponding to the shielding frequencies fx1-fxn and m second resonant branches 5 corresponding to the resonant frequencies fxn-5-fxn + m-5. That is, there are 5 first resonant branches 4 and 5 second resonant branches 5 for which the resonant frequencies correspond.
It will be readily appreciated that the connection between the first and second resonant branches 4, 5 is not limited to the connection of the second resonant branch 5 closer to the input port of the transmitting coil.
Fig. 10 is a circuit block diagram of a wireless power transmitting circuit of a fourth embodiment of the present disclosure. As shown in fig. 10, the wireless power transmitting circuit of the present embodiment includes a transmitting coil 3, a second resonant branch 5 connected in series with the transmitting coil 3, and at least one first resonant circuit 4. The first resonant branch 4 is connected in parallel to the circuit formed by the transmitting coil 3 and the second resonant branch 5. That is, the first resonant branch 4 is connected to the input port of the circuit formed by the transmitting coil 3 and the second resonant branch 5. Therefore, a part of the harmonic current in the current flowing to the transmitting coil is firstly shunted by the first resonant branch 4, and the other part of the harmonic current is blocked by the second resonant branch 5 in the subsequent circuit, so that the harmonic current cannot enter the transmitting coil to radiate or conduct outside.
Fig. 11 is a circuit block diagram of a wireless power transmitting circuit of a fifth embodiment of the present disclosure. As shown in fig. 11, the wireless power transmitting circuit of the present embodiment includes a transmitting coil 3, at least one first resonant branch 4, and a plurality of second resonant branches 5 and 5'. A part of the second resonant branches 5 are connected in series with each other and then connected to the current path of the transmitting coil 3. The first resonant branch 4 is connected in parallel with a circuit formed by a part of the second resonant branch 5 and the transmitting coil 3. I.e. to the input port of the circuit formed by a part of the second resonant branch 5 and the transmitting coil 3. Another part of the second resonance branch 5' is connected in series in the current path of the circuit formed by the above-mentioned components. Therefore, the first resonance branch 4 and the second resonance branch 5 and 5' form a T-shaped harmonic suppression network before the transmitting coil 3, so that undesired harmonic signals are suppressed from entering the transmitting coil 3 in different modes, and the purpose of suppressing EMC conducted interference and radiated interference is achieved.
Fig. 12 is a circuit block diagram of a wireless power transmitting circuit of a sixth embodiment of the present disclosure. As shown in fig. 12, the wireless power transmitting circuit of the present embodiment includes a transmitting coil 3, at least one second resonant branch 5, and a plurality of first resonant branches 4 and 4'. A part of the first resonant branch 4 is connected in parallel with the transmitting coil 3. The second resonant branch 5 is connected in series with the circuit formed by the first resonant branch 4 and the transmitting coil 3. I.e. to the current path of the circuit consisting of the first resonant branch 4 and the transmitting coil 3. The other part of the first resonant branch 4 is connected in parallel with the circuit formed by the above-mentioned components. I.e. to the input port of the circuit formed by the above-mentioned components. Therefore, the first resonance branch 4, 4' and the second resonance branch 5 form a pi-shaped harmonic suppression network before the transmitting coil 3, so that undesired harmonic signals are suppressed from entering the transmitting coil 3 in different ways, and the effect of suppressing the EMC conducted interference and the radiated interference is achieved.
It should be understood that a person skilled in the art may further modify the solution of the present disclosure according to the embodiments shown in fig. 9-12, and by combining the connection modes of the first resonant branch 4 and the second resonant tank 5, a harmonic suppression network with a more complex structure is formed.
Fig. 13 is a circuit diagram of a preferred embodiment of the present disclosure. As shown in fig. 13, in a part of the wireless power transmitting terminal, an impedance matching network 6 is provided between the inverter circuit and the transmitting coil 3. The impedance matching network 6 functions to provide impedance matching for an ac signal having an operating frequency f0 to achieve a transmit coil constant current. The impedance matching network 5 can also assist the inverter to work as a soft switch of the inverter. As shown in fig. 13, the impedance matching network includes an inductance Lc connected in series in the current path of the transmitter coil 3 and a capacitance Cc connected in parallel with the transmitter coil 3. For the wireless power transmitting circuit provided with the impedance matching network 6, the second resonant branch and the impedance matching network 6 may share the inductor Lc. That is, the capacitor Cx is connected in parallel to the two ends of the inductor Lc, so that the inductor Lc and the capacitor Cx form a second resonance branch, and the harmonic current corresponding to the shielding frequency is blocked. By adjusting the parameter of the capacitance Cx, the resonance frequency of the second resonance branch formed by the inductance Lc and the capacitance Cx can be adjusted, so that the shielding frequency can be adjusted. Since the size of the inductance element is usually large, the preferred embodiment can effectively reduce the number of circuit periods, reduce the circuit size, and suppress EMC conducted interference and radiated interference caused by harmonic signals while supporting constant current output by sharing the inductance.
By connecting one or more resonance branches substantially in parallel or in series on the transmission coil of the wireless power transmitting end, the resonance frequency of the resonance branch is set to the frequency of a high-frequency harmonic current that may be generated, whereby the high-frequency harmonic current may be blocked by the series resonance branch or shunted by the parallel resonance branch, and may not enter the transmission coil. The wireless power transmitting circuit of the present disclosure can effectively suppress EMC conducted interference and radiated interference due to high frequency harmonic current.
The above description is that of embodiments of the present disclosure. Various modifications and changes may be made without departing from the scope of the present disclosure. The present disclosure is presented for illustrative purposes and should not be construed as an exclusive description of all embodiments of the disclosure or to limit the scope of the disclosure to the particular elements illustrated and described in connection with those embodiments. Any one or more of the individual elements of the described invention may be replaced, without limitation, with alternative elements providing substantially similar functionality or otherwise providing sufficient operation. This includes both currently known replacement elements, such as those that may be currently known to those skilled in the art, as well as replacement elements that may be developed in the future, such as those that may be deemed to be replaced by those skilled in the art at the time of development.
Claims (12)
1. A wireless power transmitting circuit comprising:
a transmitting coil configured to wirelessly transmit electrical energy at a predetermined operating frequency in resonance;
at least one resonant branch, connected with the transmitting coil, configured to resonate at a corresponding shielding frequency to prevent harmonic signals at the shielding frequency from being transmitted through the transmitting coil.
2. The wireless power transmission circuit of claim 1, wherein the resonant branch comprises:
at least one first resonant branch, each for short-circuiting a subsequent circuit including the transmitting coil at a corresponding shielding frequency.
3. The wireless power transmission circuit of claim 2, wherein the resonant branch comprises a first plurality of resonant branches;
wherein different first resonant legs are configured to resonate at different shielding frequencies.
4. The wireless power transmission circuit of claim 2, wherein each of the first resonant branches is connected in parallel with the transmit coil; or,
at least one of the first resonant branches is connected in parallel with a circuit formed by the transmitting coil and at least one other resonant branch.
5. The wireless power transmission circuit of claim 2, wherein the first resonant branch comprises an inductor and a capacitor in series with each other.
6. The wireless power transmitting circuit according to claim 1 or 2, wherein the resonant branch comprises:
at least one second resonant branch, each of the second resonant branches for blocking current at a corresponding shielding frequency from flowing to a subsequent circuit including the transmit coil.
7. The wireless power transmission circuit of claim 6, wherein the resonant branch comprises a plurality of second resonant branches;
wherein the different second resonant legs are configured to resonate at different shielding frequencies.
8. The wireless power transmission circuit of claim 7, wherein the plurality of second resonant legs are connected in series with each other.
9. A wireless power transmission circuit according to claim 6, wherein at least one of the second resonant branches is connected in series with a circuit comprising the transmission coil and at least one other resonant branch.
10. The wireless power transmitting circuit according to claim 6 or 7, wherein the second resonant branch or a circuit formed by a plurality of second resonant branches connected in series with each other is disposed on a current path of the transmitting coil.
11. The wireless power transmission circuit of claim 6, wherein each of the second resonant branches comprises an inductance and a capacitance connected in parallel with each other.
12. The wireless power transmission circuit of claim 6, further comprising:
the impedance matching network is connected with the transmitting coil and comprises an inductor and a capacitor;
wherein the second resonant branch and the impedance matching network share the inductance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710263892.8A CN108736579A (en) | 2017-04-21 | 2017-04-21 | Radio energy radiating circuit |
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| CN201710263892.8A CN108736579A (en) | 2017-04-21 | 2017-04-21 | Radio energy radiating circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109546759A (en) * | 2018-12-26 | 2019-03-29 | 北京酷能科技有限公司 | Current harmonics elimination circuit |
| CN110971012A (en) * | 2019-12-02 | 2020-04-07 | 广东工业大学 | E-type wireless power transmission device and starting control method |
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| US20160056639A1 (en) * | 2014-08-25 | 2016-02-25 | NuVolta Technologies | Wireless Power Transfer System and Method |
| CN105186646A (en) * | 2015-10-12 | 2015-12-23 | 华中科技大学 | Dynamic wireless charging apparatus and parameter acquiring method thereof |
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| CN109546759A (en) * | 2018-12-26 | 2019-03-29 | 北京酷能科技有限公司 | Current harmonics elimination circuit |
| CN110971012A (en) * | 2019-12-02 | 2020-04-07 | 广东工业大学 | E-type wireless power transmission device and starting control method |
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