CN216451189U - Wireless power transmission power control system - Google Patents

Wireless power transmission power control system Download PDF

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CN216451189U
CN216451189U CN202122957344.XU CN202122957344U CN216451189U CN 216451189 U CN216451189 U CN 216451189U CN 202122957344 U CN202122957344 U CN 202122957344U CN 216451189 U CN216451189 U CN 216451189U
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power
output
switch tube
power switch
module
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李志忠
梁瑶伟
龚淑娴
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Guangdong University of Technology
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Guangdong University of Technology
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Abstract

The utility model discloses a wireless electric energy transmission power control system, which is characterized in that the input end of a transmitting end full-bridge rectification and filtering module is connected with an input alternating voltage, the output end of the transmitting end full-bridge rectification and filtering module is connected with the input end of a synchronous Buck converter, the output end of the synchronous Buck converter is connected with the input end of a power full-bridge inversion module, the output end of the power full-bridge inversion module is connected with the input end of a transmitting end resonant network, the output end of the transmitting end resonant network is wirelessly connected with the input end of a receiving end network, the output end of the receiving end network is connected with the input end of the receiving end full-bridge rectification and filtering module, the output end of the receiving end full-bridge rectification and filtering module is connected with an external load device, the input end of a control module is respectively connected with the synchronous Buck converter and the transmitting end resonant network, the output end of the control module is respectively connected with the synchronous Buck converter and the power full-bridge inversion module, stable power output is realized under the condition of certain coupling coefficient and load change.

Description

Wireless power transmission power control system
Technical Field
The present invention relates to the field of wireless power transmission technologies, and in particular, to a wireless power transmission power control system.
Background
In recent years, various electronic and electrical devices are rapidly popularized and developed, and users have new requirements on safety and reliability of electric energy transmission. When the traditional plug-in electric energy transmission technology is charged, potential safety hazards such as sparks and high-voltage electric shock exist, so that the safety, the reliability and the service life of a system are reduced, and the safety requirements of some special industrial occasions are difficult to meet. Different from the traditional electric energy transmission mode of direct contact of metal wires, the radio transmission technology utilizes magnetic fields, laser or microwaves and the like as energy transmission media, so that electric direct contact between a power grid and electric equipment is not needed, inherent defects and problems of the traditional direct contact power supply of metal wires are overcome effectively, and the utilization rate of the electric equipment to electric wires and wiring ports is greatly reduced. The wireless power transmission system has many advantages such as safety, electrical isolation, low maintenance, convenience, and capability of working in special environment and weather, and is discussed and researched by many scholars. The output power control of the wireless power transmission system is also a research hotspot. In practical applications, such as dynamic wireless power supply, constant power wireless charging, and power-adjustable power supply, stable output power control is often required. However, in a wireless power transmission system, the output of the wireless power transmission system is very sensitive to load and coupling coefficient changes, and the coupling coefficient and the load are often changed in actual operation, so that power cannot be freely and reliably obtained if the system output is not controlled.
Currently, the conventional control method for the output power of the wireless power transmission system generally feeds back the voltage and current information of the output end to the transmitting end circuit in a wireless communication manner for control, or adds an additional DC-DC converter and an active rectification control circuit at the receiving end to realize the control of the output. However, the prior control method has some defects and shortcomings: the output power control is realized in a wireless communication mode, and the stability and the reliability of the system are influenced by a certain time delay existing in communication, and the complexity of the system is increased to a certain extent; an additional control circuit is added at a receiving end to realize output power control, certain influence is generated on a transmitting end circuit when load or coupling coefficient changes, additional control needs to be added at the transmitting end, and the size of the receiving end is increased.
A wireless power transmission system and a wireless power transmission control method are disclosed in the prior art, including detecting a supply current using a current sensor; detecting the transmission state, interruption and related information of the wireless electric energy; determining the demand information of the electric energy receiving end; generating an electromagnetic wave by an electromagnetic generator; transmitting a wireless electromagnetic wave through a transmitting antenna; receiving the electromagnetic wave by a receiver; judging whether transmission is stable and the current load state based on the received wireless power transmission state and the interruption information; adjusting wireless power transmission power through a power adjuster based on the determination result; converting the received electromagnetic waves into electric energy by using an electromagnetic converter; the converted electrical energy is stored using the auxiliary power supply. The scheme also has the defects that the output is very sensitive to load and coupling coefficient change and cannot be stably output.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wireless electric energy transmission power control system which realizes stable output of output power under the condition of certain coupling coefficient and load change.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
the utility model provides a wireless power transmission power control system, includes transmitting terminal full-bridge rectification and filtering module, synchronous Buck converter, power full-bridge contravariant module, transmitting terminal resonant network, receiving terminal network and receiving terminal full-bridge rectification and filtering module and control module, wherein:
the input end of the transmitting end full-bridge rectifying and filtering module is connected with an input alternating voltage, the output end of the transmitting end full-bridge rectifying and filtering module is connected with the input end of the synchronous Buck converter, the output end of the synchronous Buck converter is connected with the input end of the power full-bridge inversion module, the output end of the power full-bridge inversion module is connected with the input end of the transmitting end resonant network, the output end of the transmitting end resonant network is wirelessly connected with the input end of the receiving end network, the output end of the receiving end network is connected with the input end of the receiving end full-bridge rectification and filtering module, the output end of the receiving end full-bridge rectification and filtering module is connected with external load equipment, the input end of the control module is respectively connected with the synchronous Buck converter and the transmitting end resonant network, and the output end of the control module is respectively connected with the synchronous Buck converter and the power full-bridge inversion module.
Preferably, the transmitting end full-bridge rectifying and filtering module comprises a rectifying diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4And a filter capacitor CinWherein:
the rectifier diode D1Respectively with the rectifying diode D3Is connected to one end of the input AC voltage, the rectifier diode D1Respectively with the rectifying diode D2Negative electrode and filter capacitor CinIs connected to the rectifying diode D3Respectively with the rectifying diode D4Positive electrode and filter capacitor CinIs connected with the other end of the rectifying diode D4Respectively with the rectifying diode D2The other end of the filter capacitor C is connected with the anode of the capacitor and the input alternating voltageinThe two ends of the synchronous Buck converter are used as the output ends of the full-bridge rectification and filtering module of the transmitting end and are connected with the synchronous Buck converter.
Preferably, the synchronous Buck converter comprises a power switch tube Q1Power switch tube Q2Power inductor L1And an output filter capacitor C0Wherein:
the power switch tube Q1Input terminal and filter capacitor CinIs connected with one end of the power switch tube Q1Respectively with the power inductor L1One end of (1), power switch tube Q2Is connected to the input terminal of a power inductor L1Another end of (1) and an output filter capacitor C0Is connected with one end of the power switch tube Q2Respectively with the filter capacitor CinAnother end of (1), an output filter capacitor C0Is connected with the other end of the output filter capacitor C0Are at both ends asThe output end of the synchronous Buck converter is connected with the power full-bridge inversion module;
the output filter capacitor C0And both ends of the power switch tube Q are also connected with the input end of the control module1Control terminal and power switch tube Q2The control end of the control module is connected with the output end of the control module.
Preferably, the power full-bridge inversion module comprises a power switch tube Q3Power switch tube Q4Power switch tube Q5And power switch tube Q6Wherein:
power switch tube Q3Respectively with the output filter capacitor C0One end of (1), power switch tube Q5Is connected with the input end of the power switch tube Q3And the output end of the power switch tube Q4Is connected with the input end of the power switch tube Q4Respectively with an output filter capacitor C0Another end of the power switch tube Q6Is connected with the output end of the power switch tube Q6And the power switch tube Q5Is connected with the output end of the power switch tube Q3Output terminal of (1), power switch tube Q5The output end of the power full-bridge inversion module is used as the output end of the power full-bridge inversion module and is connected with the transmitting end resonant network;
the power switch tube Q3Control terminal and power switch tube Q4Control terminal and power switch tube Q5Control terminal and power switch tube Q6The control ends of the two control modules are connected with the output end of the control module.
Preferably, the power switch tube Q1Power switch tube Q2Power switch tube Q3Power switch tube Q4Power switch tube Q5And power switch tube Q6The MOS transistors are all MOS transistors, wherein the grid electrode of the MOS transistor is a control end, the drain electrode of the MOS transistor is an input end, and the source electrode of the MOS transistor is an output end.
Preferably, the transmitting end resonant network comprises a resonant inductor LPAnd an excitation inductor LmParallel resonant capacitor CPAnd series resonant capacitor CTWherein:
the resonance inductor LPAnd one end of the power switch tube Q3Is connected with the output terminal of the resonant inductor LPAnd the other end of the parallel resonant capacitor C is respectively connected with the parallel resonant capacitor CPOne end of (1), excitation inductance LmIs connected to the excitation inductor LmAnd the other end of the series resonant capacitor CTIs connected to the series resonant capacitor CTAnd the other end of the parallel resonant capacitor C is respectively connected with the parallel resonant capacitor CPAnother end of the power switch tube Q5Is connected with the output end of the excitation inductor LmThe transmitting coil is used as the output end of the transmitting end resonant network and is in wireless connection with the receiving end network;
the parallel resonance capacitor CPAre also connected with the input end of the control module.
Preferably, the receiving end network comprises a resonant capacitor C1And an excitation inductance LSWherein:
the excitation inductance LSThe excitation inductor L is a receiving coil and is wirelessly connected with the transmitting end resonant networkSAnd the resonant capacitor C1Is connected to the resonant capacitor C1Another end of (1) and an excitation inductance LSAnd the other end of the network is used as the output end of the receiving end network and is connected with the receiving end full-bridge rectification and filtering module.
Preferably, the receiving end full-bridge rectification and filtering module comprises a power diode D5Power diode D6Power diode D7Power diode D8Filter capacitor CfWherein:
the power diode D5Respectively with the power diode D7Negative electrode and resonant capacitor C1Is connected to the other end of the power diode D5Respectively with the power diode D6Negative electrode and filter capacitor CfIs connected to the power diode D6Anode and power diode D8Is connected to the negative pole of the power diodeD8Respectively with the filter capacitor CfAnother terminal of (D), power diode D7The positive pole of the filter capacitor CfThe two ends of the receiving end are used as the output ends of the full-bridge rectification and filtering module of the receiving end to be connected with external load equipment.
Preferably, the control module comprises a microcontroller, a first PWM generator, a PI control module, an auxiliary power supply and a parallel capacitor CPPeak value voltage sampling module, Buck output voltage sampling module and first opto-coupler isolation drive circuit, wherein:
the auxiliary power supply is respectively connected with the microcontroller, the PI control module and the parallel capacitor CPThe peak voltage sampling module, the Buck output voltage sampling module, the first PWM generator and the first optical coupling isolation driving circuit are connected, and the parallel capacitor CPInput end of peak voltage sampling module and parallel resonance capacitor CPThe input end of the Buck output voltage sampling module is connected with the output filter capacitor C0Are connected, the input end of the microcontroller is respectively connected with the parallel capacitor CPThe output of peak voltage sampling module, the output of Buck output voltage sampling module are connected, microcontroller's output with PI control module's input is connected, PI control module's output with the input of first PWM generator is connected, the output of first PWM generator with drive circuit's input is kept apart to first opto-coupler is connected, drive circuit's output respectively with power switch pipe Q in the synchronous Buck converter1Control terminal and power switch tube Q2Is connected with the control end of the controller.
Preferably, the optical coupler isolation driving circuit further comprises a second optical coupler isolation driving circuit and a second PWM generator, wherein:
the output end of the microcontroller is also connected with the input end of the second PWM generator, the output end of the second PWM generator is connected with the input end of the second optical coupling isolation driving circuit, and the output end of the second optical coupling isolation driving circuit is connected with a power switch tube Q in the power full-bridge inversion module3Control ofEnd, power switch tube Q4Control terminal and power switch tube Q5Control terminal and power switch tube Q6Is connected with the control end of the controller.
Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:
the utility model does not need double-end communication and additional receiving end control, can realize output power control under the condition of the change of the coupling coefficient, overcomes the problem that the output power control of the traditional wireless power transmission system mainly aims at the constant fixed coupling coefficient of a coil, can realize output power control under the condition of load change, only needs one high-frequency rectifying circuit without an additional control circuit, reduces the volume of the receiving end, has high transmission efficiency, can realize soft switching and improves the efficiency of the system.
Drawings
FIG. 1 is a block diagram of the present invention.
Fig. 2 is a schematic circuit structure of the present invention.
Fig. 3 is a schematic diagram of an equivalent model of a wireless power transmission power control system, wherein (a) is a decoupling circuit equivalent model, and (b) is a simplified equivalent circuit.
FIG. 4 is a schematic diagram of a control module according to the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
This embodiment provides a wireless power transmission power control system, as shown in fig. 1 and fig. 2, including transmitting terminal full-bridge rectification and filtering module, synchronous Buck converter, power full-bridge contravariant module, transmitting terminal resonant network, receiving terminal network and receiving terminal full-bridge rectification and filtering module and control module, wherein:
the input end of the transmitting end full-bridge rectification and filtering module is connected with an input alternating voltage, the output end of the transmitting end full-bridge rectification and filtering module is connected with the input end of the synchronous Buck converter, the output end of the synchronous Buck converter is connected with the input end of the power full-bridge inversion module, the output end of the power full-bridge inversion module is connected with the input end of the transmitting end resonant network, the output end of the transmitting end resonant network is wirelessly connected with the input end of the receiving end network, the output end of the receiving end network is connected with the input end of the receiving end full-bridge rectification and filtering module, the output end of the receiving end full-bridge rectification and filtering module is connected with external load equipment, the input end of the control module is respectively connected with the synchronous Buck converter and the transmitting end resonant network, and the output end of the control module is respectively connected with the synchronous Buck converter and the power full-bridge inversion module.
The transmitting end full-bridge rectification and filtering module comprises a rectifier diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4And a filter capacitor CinWherein:
the rectifier diode D1Respectively with the rectifying diode D3Is connected to one end of the input AC voltage, the rectifier diode D1Respectively with the rectifying diode D2Negative electrode and filter capacitor CinIs connected to the rectifying diode D3Respectively with the rectifying diode D4Positive electrode and filter capacitor CinIs connected with the other end of the rectifying diode D4Respectively with the rectifying diode D2The other end of the filter capacitor C is connected with the anode of the capacitor and the input alternating voltageinThe two ends of the synchronous Buck converter are used as the output ends of the full-bridge rectification and filtering module of the transmitting end and are connected with the synchronous Buck converter.
The synchronous Buck converter comprises powerSwitch tube Q1Power switch tube Q2Power inductor L1And an output filter capacitor C0Wherein:
the power switch tube Q1Input terminal and filter capacitor CinIs connected with one end of the power switch tube Q1Respectively with the power inductor L1One end of (1), power switch tube Q2Is connected to the input terminal of a power inductor L1Another end of (1) and an output filter capacitor C0Is connected with one end of the power switch tube Q2Respectively with the filter capacitor CinAnother end of (1), an output filter capacitor C0Is connected with the other end of the output filter capacitor C0The two ends of the synchronous Buck converter are used as the output ends of the synchronous Buck converter and are connected with the power full-bridge inversion module;
the output filter capacitor C0And both ends of the power switch tube Q are also connected with the input end of the control module1Control terminal and power switch tube Q2The control end of the control module is connected with the output end of the control module.
The power full-bridge inversion module comprises a power switch tube Q3Power switch tube Q4Power switch tube Q5And power switch tube Q6Wherein:
power switch tube Q3Respectively connected with the output filter capacitor C0One end of (1), power switch tube Q5Is connected with the input end of the power switch tube Q3And the output end of the power switch tube Q4Is connected with the input end of the power switch tube Q4Respectively with an output filter capacitor C0Another end of the power switch tube Q6Is connected with the output end of the power switch tube Q6And the power switch tube Q5Is connected with the output end of the power switch tube Q3Output terminal of (1), power switch tube Q5The output end of the power full-bridge inversion module is used as the output end of the power full-bridge inversion module and is connected with the transmitting end resonant network;
the power switch tube Q3Control terminal and power switch tube Q4Control terminal and power switch tube Q5Control terminal and power switch tube Q6The control ends of the two control modules are connected with the output end of the control module.
The power switch tube Q1Power switch tube Q2Power switch tube Q3Power switch tube Q4Power switch tube Q5And power switch tube Q6The MOS transistors are all MOS transistors, wherein the grid electrode of the MOS transistor is a control end, the drain electrode of the MOS transistor is an input end, and the source electrode of the MOS transistor is an output end.
The transmitting end resonant network comprises a resonant inductor LPAnd an excitation inductor LmParallel resonant capacitor CPAnd series resonant capacitor CTWherein:
the resonant inductor LPAnd one end of the power switch tube Q3Is connected with the output terminal of the resonant inductor LPAnd the other end of the parallel resonant capacitor C is respectively connected with the parallel resonant capacitor CPOne end of (1), excitation inductance LmIs connected to the excitation inductor LmAnd the other end of the series resonant capacitor CTIs connected to the series resonant capacitor CTAnd the other end of the parallel resonant capacitor C is respectively connected with the parallel resonant capacitor CPAnother end of the power switch tube Q5Is connected with the output end of the excitation inductor LmThe transmitting coil is used as the output end of the transmitting end resonant network and is in wireless connection with the receiving end network;
the parallel resonance capacitor CPAre also connected with the input end of the control module.
The receiving end network comprises a resonant capacitor C1And an excitation inductance LSWherein:
the excitation inductance LSThe excitation inductor L is a receiving coil and is wirelessly connected with the transmitting end resonant networkSAnd the resonant capacitor C1Is connected to the resonant capacitor C1Another end of (1) and an excitation inductance LSAnd the other end of the network is used as the output end of the receiving end network and is connected with the receiving end full-bridge rectification and filtering module.
The jointThe receiving end full-bridge rectification and filtering module comprises a power diode D5Power diode D6Power diode D7Power diode D8Filter capacitor CfWherein:
the power diode D5Respectively with the power diode D7Negative electrode and resonant capacitor C1Is connected to the other end of the power diode D5Respectively with the power diode D6Negative electrode and filter capacitor CfIs connected to the power diode D6Anode and power diode D8Is connected to the negative pole of the power diode D8Respectively with the filter capacitor CfAnother terminal of (D), power diode D7The positive pole of the filter capacitor CfThe two ends of the receiving end are used as the output ends of the full-bridge rectification and filtering module of the receiving end to be connected with external load equipment.
Example 2
In this embodiment, the operation principle of the wireless power transmission power control system is explained based on embodiment 1.
The transmitting end resonant network and the receiving end network in embodiment 1 jointly form an LCC-S resonant network, and the function of this part of the circuit is to convert an ac square wave into a high-frequency ac sine wave through the resonant network, so that energy can be transmitted to the receiving end through a resonant mode, and the circuit structure shown in fig. 2 is simplified to obtain an equivalent circuit model shown in fig. 3.
Figure BDA0003377729220000081
Is a fundamental wave equivalent alternating current source and comprises:
Figure BDA0003377729220000082
wherein
Figure BDA0003377729220000083
VabFor the output of synchronous Buck convertersVoltage is output, and omega is angular frequency;
reflection impedance R of transmitting endeqComprises the following steps:
Figure BDA0003377729220000084
where ω is the angular frequency, ReIs an AC load resistor, M is the mutual inductance of the transmitting coil and the receiving coil
Figure BDA0003377729220000085
Using Kirchhoff's Voltage Law (KVL) and Kirchhoff's Current Law (KCL), it can be derived from fig. 3 (b):
Figure BDA0003377729220000086
wherein ZLm＝jωLm,ZLP＝jωLP,
Figure BDA0003377729220000087
Figure BDA0003377729220000088
When a WPT (wireless power transmission) system resonates, the transmitted energy and efficiency are the highest, and in order to enable the LCC-S type WPT system to work in a resonant state, a transmitting end needs to meet the following requirements:
Figure BDA0003377729220000089
the binding formulae (3) and (4) can be given as follows:
Figure BDA0003377729220000091
due to the fact that
Figure BDA0003377729220000092
According to formula (5):
Figure BDA0003377729220000093
as can be seen from FIG. 3(a), the receiving end resonates
Figure BDA0003377729220000094
Further, the equivalent AC output voltage is derived
Figure BDA0003377729220000095
Comprises the following steps:
Figure BDA0003377729220000096
in the formula (5)
Figure BDA0003377729220000097
Is brought into availability
Figure BDA0003377729220000098
Comprises the following steps:
Figure BDA0003377729220000099
so as to obtain the output DC power PoutComprises the following steps:
Figure BDA00033777292200000910
the following equations (6) and (9) can be obtained:
Figure BDA00033777292200000911
the voltage of the parallel resonant capacitor CP can be obtained
Figure BDA00033777292200000912
Comprises the following steps:
Figure BDA00033777292200000913
the peak voltage V of the capacitor is obtained from the equation (11)CPPComprises the following steps:
Figure BDA00033777292200000914
further knowing the output power PoutComprises the following steps:
Figure BDA00033777292200000915
the LCC-S compensation type wireless power transmission system can output power by a parallel capacitor C according to the formula (13)PPeak voltage Vcpp and LCC-S compensation network input voltage UinThe mutual inductance of the coil and the magnitude of the load are shown and need not be known. And a capacitance CPNot only participate in resonance in the system, but also cooperate with the inductance LPThe low-pass filter is formed to effectively reduce the influence of higher harmonic waves, so that the capacitor CPThe voltage information can accurately reflect the output power of the system. It can be known from the equation (9) that under the same mutual inductance and load condition, the output power Pout monotonically increases with the input voltage Uin, and similarly, the output power Pout monotonically increases with the input voltage Uin in the transformed equation (13), and a first-stage Buck circuit is added for controlling the output power, and the input voltage of the LCC-S compensation network is adjusted by using a PI (proportional regulation and integral regulation) control method.
Example 3
In this embodiment, based on the embodiments 1 and 2, the corresponding structure of the control module is continuously disclosed, and as shown in fig. 4, the control module includes a microcontroller, a first PWM generator, a PI control module, an auxiliary power supply, and a parallel capacitor CPPeak value voltage sampling module, Buck output voltage sampling module and first opto-coupler isolation drive circuit, wherein:
the auxiliary power supplyThe source is respectively connected with the microcontroller, the PI control module and the parallel capacitor CPThe peak voltage sampling module, the Buck output voltage sampling module, the first PWM generator and the first optical coupling isolation driving circuit are connected, and the parallel capacitor CPInput end of peak voltage sampling module and parallel resonance capacitor CPThe input end of the Buck output voltage sampling module is connected with the output filter capacitor C0Are connected, the input end of the microcontroller is respectively connected with the parallel capacitor CPThe output of peak voltage sampling module, the output of Buck output voltage sampling module are connected, microcontroller's output with PI control module's input is connected, PI control module's output with the input of first PWM generator is connected, the output of first PWM generator with drive circuit's input is kept apart to first opto-coupler is connected, drive circuit's output respectively with power switch pipe Q in the synchronous Buck converter1Control terminal and power switch tube Q2Is connected with the control end of the controller.
The microcontroller is connected with a capacitor C in parallelPThe peak voltage sampling module and the Buck output voltage sampling module obtain a parallel capacitor CPCalculating the output power of the system according to the formula (13) by using the peak voltage and the output voltage of the synchronous Buck converter, and controlling the PWM generator to output two paths of frequency f by using a PI control module2And the duty ratio of the PWM wave is variable, and the PWM wave drives a power switch tube Q in the synchronous Buck converter through a first optical coupling isolation driving circuit1、Q2The control of the output voltage of the synchronous Buck converter is realized, and the control of the output power of the system is further realized.
Still include second opto-isolator drive circuit and second PWM generator, wherein:
the output end of the microcontroller is also connected with the input end of the second PWM generator, the output end of the second PWM generator is connected with the input end of the second optical coupling isolation driving circuit, and the output end of the second optical coupling isolation driving circuit is connected with a power switch tube Q in the power full-bridge inversion module3The control end of,Power switch tube Q4Control terminal and power switch tube Q5Control terminal and power switch tube Q6Is connected with the control end of the controller.
In this embodiment, the microcontroller controls the second PWM generator to generate four paths of frequency f1And a PWM wave with a duty ratio of 50 percent drives a power switch tube Q through a second optical coupling isolation driving circuit3Power switch tube Q4Power switch tube Q5And power switch tube Q6And the half-bridge inversion function of the transmitting end is realized.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a wireless power transmission power control system which characterized in that, including transmitting terminal full-bridge rectification and filtering module, synchronous Buck converter, power full-bridge contravariant module, transmitting terminal resonant network, receiving terminal network and receiving terminal full-bridge rectification and filtering module and control module, wherein:
the input end of the transmitting end full-bridge rectifying and filtering module is connected with an input alternating voltage, the output end of the transmitting end full-bridge rectifying and filtering module is connected with the input end of the synchronous Buck converter, the output end of the synchronous Buck converter is connected with the input end of the power full-bridge inversion module, the output end of the power full-bridge inversion module is connected with the input end of the transmitting end resonant network, the output end of the transmitting end resonant network is wirelessly connected with the input end of the receiving end network, the output end of the receiving end network is connected with the input end of the receiving end full-bridge rectification and filtering module, the output end of the receiving end full-bridge rectification and filtering module is connected with external load equipment, the input end of the control module is respectively connected with the synchronous Buck converter and the transmitting end resonant network, and the output end of the control module is respectively connected with the synchronous Buck converter and the power full-bridge inversion module.
2. The wireless power transfer power control system of claim 1 wherein the transmit side full bridge rectification and filtering module comprises a rectifier diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4And a filter capacitor CinWherein:
the rectifier diode D1Respectively with the rectifying diode D3Is connected to one end of the input AC voltage, the rectifier diode D1Respectively with the rectifying diode D2Negative electrode and filter capacitor CinIs connected to the rectifying diode D3Respectively with the rectifying diode D4Positive electrode and filter capacitor CinIs connected with the other end of the rectifying diode D4Respectively with the rectifying diode D2The other end of the filter capacitor C is connected with the anode of the capacitor and the input alternating voltageinThe two ends of the synchronous Buck converter are used as the output ends of the full-bridge rectification and filtering module of the transmitting end and are connected with the synchronous Buck converter.
3. The wireless power transfer power control system of claim 2 wherein the synchronous Buck converter comprises a power switch Q1Power switch tube Q2Power inductor L1And an output filter capacitor C0Wherein:
the power switch tube Q1Input terminal and filter capacitor CinIs connected at one end toRate switching tube Q1Respectively with the power inductor L1One end of (1), power switch tube Q2Is connected to the input terminal of a power inductor L1Another end of (1) and an output filter capacitor C0Is connected with one end of the power switch tube Q2Respectively with the filter capacitor CinAnother end of (1), an output filter capacitor C0Is connected with the other end of the output filter capacitor C0The two ends of the synchronous Buck converter are used as the output ends of the synchronous Buck converter and are connected with the power full-bridge inversion module;
the output filter capacitor C0And both ends of the power switch tube Q are also connected with the input end of the control module1Control terminal and power switch tube Q2The control end of the control module is connected with the output end of the control module.
4. The system according to claim 3, wherein the power full-bridge inverter module comprises a power switch Q3Power switch tube Q4Power switch tube Q5And power switch tube Q6Wherein:
power switch tube Q3Respectively with the output filter capacitor C0One end of (1), power switch tube Q5Is connected with the input end of the power switch tube Q3And the output end of the power switch tube Q4Is connected with the input end of the power switch tube Q4Respectively with an output filter capacitor C0Another end of the power switch tube Q6Is connected with the output end of the power switch tube Q6And the power switch tube Q5Is connected with the output end of the power switch tube Q3Output terminal of (1), power switch tube Q5The output end of the power full-bridge inversion module is used as the output end of the power full-bridge inversion module and is connected with the transmitting end resonant network;
the power switch tube Q3Control terminal and power switch tube Q4Control terminal and power switch tube Q5Control terminal and power switch tube Q6Control terminals of the controller are all connected with the output of the control moduleAnd end connection.
5. The system of claim 3 or 4, wherein the power switch Q is1Power switch tube Q2Power switch tube Q3Power switch tube Q4Power switch tube Q5And power switch tube Q6The MOS transistors are all MOS transistors, wherein the grid electrode of the MOS transistor is a control end, the drain electrode of the MOS transistor is an input end, and the source electrode of the MOS transistor is an output end.
6. The wireless power transfer power control system of claim 4, wherein the transmit-side resonant network comprises a resonant inductor LPAnd an excitation inductor LmParallel resonant capacitor CPAnd series resonant capacitor CTWherein:
the resonance inductor LPAnd one end of the power switch tube Q3Is connected with the output terminal of the resonant inductor LPAnd the other end of the parallel resonant capacitor C is respectively connected with the parallel resonant capacitor CPOne end of (1), excitation inductance LmIs connected to the excitation inductor LmAnd the other end of the series resonant capacitor CTIs connected to the series resonant capacitor CTAnd the other end of the parallel resonant capacitor C is respectively connected with the parallel resonant capacitor CPAnother end of the power switch tube Q5Is connected with the output end of the excitation inductor LmThe transmitting coil is used as the output end of the transmitting end resonant network and is in wireless connection with the receiving end network;
the parallel resonance capacitor CPAre also connected with the input end of the control module.
7. The wireless power transfer power control system of claim 6, wherein the receiving end network comprises a resonant capacitor C1And an excitation inductance LSWherein:
the excitation inductance LSThe excitation inductor L is a receiving coil and is wirelessly connected with the transmitting end resonant networkSOne end of (A)And the resonance capacitor C1Is connected to the resonant capacitor C1Another end of (1) and an excitation inductance LSThe other end of the receiving end network is used as the output end of the receiving end network and is connected with the receiving end full-bridge rectification and filtering module.
8. The wireless power transfer power control system of claim 7, wherein the receiving-end full-bridge rectification and filtering module comprises a power diode D5Power diode D6Power diode D7Power diode D8Filter capacitor CfWherein:
the power diode D5Respectively with the power diode D7Negative electrode and resonant capacitor C1Is connected to the other end of the power diode D5Respectively with the power diode D6Negative electrode and filter capacitor CfIs connected to the power diode D6Anode and power diode D8Is connected to the negative pole of the power diode D8Respectively with the filter capacitor CfAnother terminal of (D), power diode D7The positive pole of the filter capacitor CfThe two ends of the receiving end are used as the output ends of the full-bridge rectification and filtering module of the receiving end to be connected with external load equipment.
9. The system according to claim 8, wherein the control module comprises a microcontroller, a first PWM generator, a PI control module, an auxiliary power supply, and a parallel capacitor CPPeak value voltage sampling module, Buck output voltage sampling module and first opto-coupler isolation drive circuit, wherein:
the auxiliary power supply is respectively connected with the microcontroller, the PI control module and the parallel capacitor CPThe peak voltage sampling module, the Buck output voltage sampling module, the first PWM generator and the first optical coupling isolation driving circuit are connected, and the parallel capacitor CPInput end of peak voltage sampling module and parallel resonance capacitor CPThe input end of the Buck output voltage sampling module is connected with the output filter capacitor C0Are connected, the input end of the microcontroller is respectively connected with the parallel capacitor CPThe output of peak voltage sampling module, the output of Buck output voltage sampling module are connected, microcontroller's output with PI control module's input is connected, PI control module's output with the input of first PWM generator is connected, the output of first PWM generator with drive circuit's input is kept apart to first opto-coupler is connected, drive circuit's output respectively with power switch pipe Q in the synchronous Buck converter1Control terminal and power switch tube Q2Is connected with the control end of the controller.
10. The wireless power transfer power control system of claim 9, further comprising a second opto-isolator driver circuit and a second PWM generator, wherein:
the output end of the microcontroller is also connected with the input end of the second PWM generator, the output end of the second PWM generator is connected with the input end of the second optical coupling isolation driving circuit, and the output end of the second optical coupling isolation driving circuit is connected with a power switch tube Q in the power full-bridge inversion module3Control terminal and power switch tube Q4Control terminal and power switch tube Q5Control terminal and power switch tube Q6Is connected with the control end of the controller.
CN202122957344.XU 2021-11-26 2021-11-26 Wireless power transmission power control system Active CN216451189U (en)

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