CN208849553U - A kind of SS offset-type constant current wireless charging power supply of transmitting terminal Buck control - Google Patents
A kind of SS offset-type constant current wireless charging power supply of transmitting terminal Buck control Download PDFInfo
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- CN208849553U CN208849553U CN201821819331.8U CN201821819331U CN208849553U CN 208849553 U CN208849553 U CN 208849553U CN 201821819331 U CN201821819331 U CN 201821819331U CN 208849553 U CN208849553 U CN 208849553U
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- power supply
- transmitting terminal
- wireless charging
- charging power
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Abstract
A kind of SS offset-type constant current wireless charging power supply of transmitting terminal Buck control, which includes transmitting terminal and receiving end；Transmitting terminal includes sequentially connected DC source, Buck converter, full-bridge inverter, and transmitting coil and S compensation circuit of connecting, receiving end includes receiving coil and S compensation circuit of connecting, full-bridge rectification filter circuit and load, aforementioned receiving coil are coupled with transmitting coil, and the alternating magnetic field received is converted to alternating current and is charged to load.The utility model has the advantages that system rejection to disturbance is strong, and receiving end is small in size and at low cost, especially suitable for complex electromagnetic environment or to the wireless charging occasion of receiving end volume requirement harshness.
Description
Technical field
The utility model relates to the SS offset-type constant current wireless chargings that power technique fields more particularly to transmitting terminal Buck control
Power supply.
Background technique
Wireless charger refers to the charger being connected on the terminal device for needing to charge without traditional charging power cord,
Electric energy, Inductive coupling techniques are transmitted by using the alternating magnetic field generated between coil using newest wireless charging technology
The bridge of connection charging base station and equipment will be become.
For control mode, wireless charging power supply can be divided into transmitting terminal control type and receiving end control type.
1, transmitting terminal control type specifically include that rectifier bridge control, inversion bridge Phase shifted PWM Controlled, inversion full-bridge frequency modulation control with
And DC-DC Regulation Control.ICPT system is according to the difference of control method, and there are mainly two types of structures for primary circuit: rectification, DC-DC
The structure of the triple transformation of link, full-bridge inverting and rectification, full-bridge inverting double structure.
Rectifier bridge control: rectification can be divided into uncontrollable rectifier and controlled rectification two ways.Uncontrollable rectifier: uncontrollable rectification
Circuit is made of uncontrollable diode completely, the ratio of its DC rectifier voltage and AC supply voltage value after circuit structure is certain
It is fixed and invariable.Controlled rectification: the average value and polarity for exporting DC voltage can be by the conduction status of control element
It is adjusted.
DC-DC Regulation Control: there are DC-DC links in primary circuit, can adjust and control to this link, in turn
The output power of realization system.DC-DC link can use Buck or Boost circuit etc., be opened by adjusting these circuits
The duty ratio for closing pipe driving signal, which can be thus achieved, controls power output.DC/DC link regulating system is added in primary side
The shortcomings that input direct-current voltage: increasing main circuit link, to not only increase system cost, but also reduces system effectiveness, and
And usually added DC/DC link works in hard switching state, and increases the EMI value of system.
Inversion bridge Phase shifted PWM Controlled: full bridge inverter all there must be in two kinds of structures, to primary side full-bridge inverter
Using phase shifting control, the energy of injection primary side resonant network is adjusted by adjusting the size of phase shifting angle, thus regulating system
Transimission power.Disadvantage: phase-shifting control method can make the switching tube of primary side inverter work in hard switching mode, in transimission power
When larger, this will increase the switching loss of system and EMI value.
Inversion full-bridge frequency modulation control: it is similar to the detuning control of primary side and (accesses switching capacity or phase in primary side resonant tank
Inductance is controlled, its equivalent capacitance value or inductance value are adjusted, so that system is in tuning state or nonresonant state, to adjust and be
The transimission power of system), frequency modulation control is realized by adjusting the frequency departure system resonance frequencies of full bridge inverter driving signal
Primary side input power control, to control the constant of secondary side output electric current or voltage.
2, receiving end control type specifically include that DC-DC Regulation Control, dynamically detune control and short circuit detune control three kinds
Mode.
DC-DC Regulation Control: DC-DC link of connecting in secondary circuit can such as connect one behind secondary side rectifier bridge
Buck or Boost circuit, input current characteristics are preferable, can carry out PFC, can also carry out short-circuit decoupling.
Buck circuit works in the mode of high frequency, and advantage is that control is simple, the disadvantage is that decompression or boosting inverter can only be carried out.Work
In low frequency mode, it is equivalent to when switching tube is opened, behind rectifier bridge and has connect LC filtering powering load；When switching tube is closed
When, diode acts the function of preventing electric current from flowing backward at this time, at this time there are two circuit, before be equivalent to short-circuit decoupling, by subsequent
Capacitor maintenance supplies electricity to load.Advantage is controlled also simply, the disadvantage is that can only be depressured or be boosted, and final output
Voltage ripple is larger, is not suitable for the high system of control accuracy requirement.In addition, controlling output voltage and electric current using DC-DC circuit
When, it is also necessary to consideration open the light pipe duty ratio problem namely duty ratio it is too small, it is difficult to adjust.
Dynamic tuning control is that a phased inductance is added in a resonant circuit, adjusts inductive current by phase shifting control,
Secondary side can be made to be in tuning state or nonresonant state, achieve the purpose that control output power.The advantages of this mode is
System operating frequency can be made consistent with natural resonance frequency, dynamic property is fine.But control is extremely complex, it is difficult to carry out real
Border operation.
Short-circuit decoupling control is by the way that modes such as secondary coil paralleling switch mode controllers, this mode has structure
Simply, the advantages that intuitive is controlled, but this mode lower switch pipe can not achieve Sofe Switch, therefore excessive power loss makes it
Be not suitable for the system of high-power ICPT.
For above two type, there are disadvantages for transmitting terminal control type are as follows: is based on communication, needs to connect
The charging voltage information of receiving end is transferred to transmitting side controller in real time, when wireless communication is interfered, it will lead to system
Job insecurity.Meanwhile certain special occasions (as underwater), existing wireless communications mode is unreliable or unavailable.
There are disadvantages for receiving end control type are as follows:, can be directly in receiving end pair by increasing DC-DC converter in receiving end
Charging voltage is controlled, without wireless communication.But the miniaturization that the volume of DC-DC converter directly affects receiving end is set
Meter.With the promotion of power grade, due to the presence of inductance and capacitor, the volume of DC-DC converter can be sharply increased.
Utility model content
The purpose of this utility model be in view of the above-mentioned problems, propose the SS offset-type constant current of transmitting terminal Buck control a kind of without
Line charge power supply is estimated without increasing additional DC-DC converter and wireless communication on secondary side by transmitting terminal electric parameter
Then charging voltage value controls primary side Buck converter using PI algorithm, realize charging voltage perseverance indirectly by adjusting duty ratio
It is fixed
The technical solution of the utility model is:
A kind of SS offset-type constant current wireless charging power supply of transmitting terminal Buck control, the power supply include transmitting terminal and receive
End；Transmitting terminal includes sequentially connected DC source, Buck converter, full-bridge inverter and transmitting coil and S compensation electricity of connecting
Road, receiving end include receiving coil and S compensation circuit, full-bridge rectification filter circuit and the load of connecting, aforementioned receiving coil and hair
The coupling of ray circle, is converted to alternating current for the alternating magnetic field received and charges to load.
Further, in the transmitting terminal, the both ends of DC source simultaneously connect Buck converter, and Buck converter includes switch
Pipe QB1 and QB2, afterflow inductance LB and filter capacitor CB, after switching tube QB1 and the QB2 series connection with DC source and connect, continue
After galvanic electricity sense LB and filter capacitor CB concatenation with aforementioned switches pipe QB2 and connect, the DC voltage Ubus of DC source output passes through
Buck converter is input to full-bridge inverter after being adjusted；
The full-bridge inverter includes switching tube Q1-Q4, and the tie point of aforementioned afterflow inductance LB and filter capacitor CB are made
For the output of Buck converter, the output voltage of the point forms the electricity used for wireless charging power supply after full-bridge inverter
Press Us；
The transmitting coil includes the resistance R1, transmitting coil L1 and capacitor C1 being sequentially connected in series with S compensation circuit of connecting,
Aforementioned resistance R1 and capacitor C1 is serially connected in the both ends of transmitting coil L1, forms the first series compensation circuit, full-bridge inverter it is defeated
It is out the both ends that the tie point of switching tube Q1, Q4 and the tie point of switching tube Q2, Q3 are separately connected series compensation circuit.
Further, the DC source is obtained or market finished product direct current by power frequency 220Vac by current rectifying and wave filtering circuit
Power supply.
Further, the switching tube Q1-Q4 is all made of MOSFET or IGBT pipe.
Further, the voltage Us used for wireless charging power supply is high-frequency alternating voltage, be 20kHz or
85kHz。
Further, load uses Li-ion batteries piles or lead-acid battery.
Further, in the receiving end, receiving coil includes receiving coil L2, resistance R2 with S compensation circuit of connecting
Both ends with receiving coil L2 is connected on after capacitor C, aforementioned resistance R2 and capacitor C2 concatenation, form the second series compensation circuit；
The full-bridge rectification filter circuit includes diode D1-D4, for aforementioned alternating current to be converted to direct current,
It charges to load.
The utility model has the beneficial effects that
The utility model is especially suitable for that can not use wireless communication to carry out occasion (such as the strong electromagnetic of closed-loop control
And the occasions such as underwater), by using the utility model proposes SS offset-type constant pressure wireless charging power supplys to be sent out by detection
End electric parameter is penetrated, estimation receiving end loads charging voltage value, and then indirect by the Buck converter that transmitting terminal PI is controlled
Charging voltage is adjusted, to keep its maintenance constant.
The utility model has the advantages that system rejection to disturbance is strong, and receiving end is small in size and at low cost, especially suitable for multiple
Strays magnetic environment or wireless charging occasion to receiving end volume requirement harshness.
Other features and advantages of the utility model will then part of the detailed description can be specified.
Detailed description of the invention
The utility model illustrative embodiments are described in more detail in conjunction with the accompanying drawings, the utility model it is upper
It states and other purposes, feature and advantage will be apparent, wherein in the utility model illustrative embodiments, phase
Same reference label typically represents same parts.
Fig. 1 is SS offset-type constant current wireless charging power supply block diagram.
Fig. 2 is mutual inductance circuit model circuit diagram.
Fig. 3 is the open-loop simulation analysis schematic diagram of constant-current charging power.
Fig. 4 is the Buck converter block diagram based on PI algorithm.
Fig. 5 is the closed-loop simulation analysis schematic diagram of constant-current charging power.
Specific embodiment
Preferred embodiments of the present invention are more fully described below with reference to accompanying drawings.Although showing this in attached drawing
The preferred embodiment of utility model, however, it is to be appreciated that may be realized in various forms the utility model without should be by here
The embodiment of elaboration is limited.
As shown in Figure 1, the utility model proposes SS offset-type constant pressure wireless charging power supply mainly by transmitting terminal and receive
Hold two parts composition.Transmitting terminal mainly includes DC source, Buck converter, full-bridge inverter and transmitting coil and (S) benefit of connecting
It repays；Receiving end mainly include receive end-coil with connect (S) compensate, full-bridge rectification/filtering and load (such as Li-ion batteries piles,
Lead-acid battery etc.).Specifically, each section effect is described as follows with correlation:
DC source: being obtained by power frequency 220Vac by current rectifying and wave filtering circuit or market finished product DC power supply.
Buck converter: by switching tube (MOSFET or IGBT) QB1 and QB2, afterflow inductance LB and filter capacitor CB
It constitutes.The DC voltage Ubus of DC source output is input to full-bridge inverter after being adjusted by Buck converter.
Full-bridge inverter: it is made of switching tube (MOSFET or IGBT) Q1, Q2, Q3 and Q4.The output of Buck converter
Voltage after full-bridge inverter, formed be suitable for high-frequency alternating voltage that wireless charging power supply uses (such as 20kHz and
85kHz)。
Transmitting coil is with (S) compensation of connecting: having work identical with full-bridge inverter by the compensated transmitting coil of S
The alternating voltage that full-bridge inverter generates is converted to alternating magnetic field to greatest extent and is sent to receiving end by frequency.
Receiving coil is with (S) compensation of connecting: having the alternation magnetic with transmitting coil transmitting by the compensated receiving coil of S
The identical working frequency in field, is converted to alternating current for the alternating magnetic field received.
Full-bridge rectification/filtering: alternating current is converted to direct current by receiving end full-bridge rectification/filter, is filled for loading
Electricity.
When it is implemented, the specific work process and principle of this product is described with reference to the drawings:
Based on structural block diagram described in 1, the utility model proposes SS offset-type constant pressure wireless charging power supply use base
The constant current of receiving end charging voltage is realized in the duty ratio control of Buck converter.Concrete operating principle, as described below:
As shown in Fig. 2, can be obtained based on Kirchhoff's second law (KVL):
Wherein, SS:Zp=R1+jωL1+1/jωC1Zs=R2+Re+jωL2+1/jωC2 (2)
Primary and secondary side resonance current expression formula are as follows:
The output voltage of full-bridge inverter expresses formula are as follows:
Wherein, D is Buck converter duty ratio.
System works in resonant state, and the impedance to transmitting terminal is fed back in receiving end are as follows:
Primary side resonance current virtual value expression formula are as follows:
SS:
On the basis of (1)~(6), the expression formula of primary side resonance current virtual value and charging voltage can be obtained:
SS:
When system parameter determines, the β in (7) is constant, by controlling I1_RMSIt can realize indirectly to UoControl.Together
When, (6) show by adjusting the i.e. adjustable I of D1_RMS, namely pass through the i.e. controllable U of Do.Furthermore, (6) and (7) are this reality
With novel core formula.For more intuitive description (6) and (7), the simulation result in Fig. 3 is provided.Curve is further in Fig. 3
The duty ratio D for being verified control Buck converter can indirectly control charging voltage Uo, and β=0.12.
On the basis of the above, transmitting terminal Buck transformation is controlled using PI algorithm, finally realizes constant charge voltage
Control.Reasonability for the PI algorithm proposed in proof diagram 4 gives Fig. 5 simulation result.Known to: by using the PI algorithm of proposition
The duty ratio for adjusting Buck converter, to maintain charging current constant.
Each embodiment of the utility model is described above, above description is exemplary, and non-exclusive, and
And it is also not necessarily limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for
Many modifications and changes are obvious for those skilled in the art.
Claims (7)
1. a kind of SS offset-type constant current wireless charging power supply of transmitting terminal Buck control, which is characterized in that the power supply includes transmitting
End and receiving end；Transmitting terminal includes sequentially connected DC source, Buck converter, full-bridge inverter and transmitting coil and string
Join S compensation circuit, receiving end includes receiving coil and S compensation circuit, full-bridge rectification filter circuit and the load of connecting, aforementioned reception
Coil is coupled with transmitting coil, and the alternating magnetic field received is converted to alternating current and is charged to load.
2. the SS offset-type constant current wireless charging power supply of transmitting terminal Buck control according to claim 1, which is characterized in that
In the transmitting terminal, the both ends of DC source simultaneously connect Buck converter, and Buck converter includes switching tube QB1 and QB2, afterflow electricity
Feel LB and filter capacitor CB, after switching tube QB1 and the QB2 series connection with DC source and connect, afterflow inductance LB and filtered electrical
Hold after CB concatenation with aforementioned switches pipe QB2 and connect, the DC voltage Ubus of DC source output is adjusted by Buck converter
After be input to full-bridge inverter；
The full-bridge inverter includes switching tube Q1-Q4, the tie point conduct of aforementioned afterflow inductance LB and filter capacitor CB
The output of Buck converter, the output voltage of the point form the voltage used for wireless charging power supply after full-bridge inverter
Us；
The transmitting coil and S compensation circuit of connecting include the resistance R1 being sequentially connected in series, transmitting coil L1 and capacitor C1, aforementioned
Resistance R1 and capacitor C1 is serially connected in the both ends of transmitting coil L1, forms the first series compensation circuit, and the output of full-bridge inverter is
The tie point of switching tube Q1, Q4 and the tie point of switching tube Q2, Q3 are separately connected the both ends of series compensation circuit.
3. the SS offset-type constant current wireless charging power supply of transmitting terminal Buck control according to claim 2, which is characterized in that
The DC source is obtained by power frequency 220Vac by current rectifying and wave filtering circuit or market finished product DC power supply.
4. the SS offset-type constant current wireless charging power supply of transmitting terminal Buck control according to claim 2, which is characterized in that
The switching tube Q1-Q4 is all made of MOSFET or IGBT pipe.
5. the SS offset-type constant current wireless charging power supply of transmitting terminal Buck control according to claim 2, which is characterized in that
The voltage Us used for wireless charging power supply is high-frequency alternating voltage, is 20kHz or 85kHz.
6. the SS offset-type constant current wireless charging power supply of transmitting terminal Buck control according to claim 2, which is characterized in that
Load uses Li-ion batteries piles or lead-acid battery.
7. the SS offset-type constant current wireless charging power supply of transmitting terminal Buck control according to claim 1, which is characterized in that
In the receiving end, receiving coil includes receiving coil L2, resistance R2 and capacitor C, aforementioned resistance R2 with S compensation circuit of connecting
Both ends with receiving coil L2 is connected on after capacitor C2 concatenation, form the second series compensation circuit；
The full-bridge rectification filter circuit includes diode D1-D4, for aforementioned alternating current to be converted to direct current, to negative
Carry charging.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821819331.8U CN208849553U (en) | 2018-11-06 | 2018-11-06 | A kind of SS offset-type constant current wireless charging power supply of transmitting terminal Buck control |
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| CN201821819331.8U CN208849553U (en) | 2018-11-06 | 2018-11-06 | A kind of SS offset-type constant current wireless charging power supply of transmitting terminal Buck control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682627A (en) * | 2020-08-14 | 2020-09-18 | 深圳赫兹创新技术有限公司 | Anti-offset wireless charging circuit and control method |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682627A (en) * | 2020-08-14 | 2020-09-18 | 深圳赫兹创新技术有限公司 | Anti-offset wireless charging circuit and control method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20190510 Termination date: 20191106 |