CN110912282B - Wireless power transmission system and optimization method thereof - Google Patents

Wireless power transmission system and optimization method thereof Download PDF

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CN110912282B
CN110912282B CN201911212372.XA CN201911212372A CN110912282B CN 110912282 B CN110912282 B CN 110912282B CN 201911212372 A CN201911212372 A CN 201911212372A CN 110912282 B CN110912282 B CN 110912282B
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wireless power
power transmission
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CN110912282A (en
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王丽芳
刘志孟
陶成轩
张玉旺
郭彦杰
李芳�
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Institute of Electrical Engineering of CAS
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

Abstract

The invention discloses a wireless power transmission system and an optimization method thereof. The system comprises: the system comprises a power supply, an inverter, an LCC-S type compensation network, a rectifier bridge and a Boost converter; the input end of the inverter is connected with the power supply, and the output end of the inverter is connected with the input end of the LCC-S type compensation network; the output end of the LCC-S type compensation network is connected with the input end of a rectifier bridge, and the output end of the rectifier bridge is connected with a Boost converter. By adopting the wireless power transmission system and the optimization method thereof, the Boost converter is added in the wireless power transmission system, the transmission efficiency of the wireless power transmission system and the electrical stress of the LCC-S type compensation network of the wireless power transmission system are considered, and the wireless power transmission system has the advantages of improving the safety and stability of the wireless power transmission system during working.

Description

Wireless power transmission system and optimization method thereof
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a wireless power transmission system and an optimization method thereof.
Background
The wireless power transmission system has gained wide attention due to the advantages of wireless connection, high automation degree and space saving, and is introduced into the fields of electric vehicles, mobile phone charging, smart homes, logistics trolleys and the like. In practical application, according to the requirements of adjusting output voltage and optimizing the performance of a wireless power transmission system, an additional converter needs to be added to the primary side or the secondary side of a wireless power transmission coil.
At present, some researches are carried out by adding a Buck converter on a secondary side and carrying out voltage division sampling, and adjusting a primary power supply to realize the constancy of output voltage, so that the stability of a system is improved, but the influence of the newly added Buck converter on the transmission efficiency of a wireless power transmission system and the electric stress of an LCC-S type compensation network of the wireless power transmission system is not considered. Other researches are carried out by adding the topology of the Buck converter to the front stage and the rear stage of the wireless power transmission system. The frequency tracking is realized through the phase-locked loop, so that the system always works at a resonant frequency when the resonant parameters change, and the DC-DC converter is used on the secondary side to adjust the equivalent load to inhibit frequency splitting, so that the frequency tracking is not influenced by the frequency splitting phenomenon, but only the influence of the Buck converter on the frequency splitting is considered, the influence of the Buck converter on the transmission efficiency of the wireless power transmission system and the electric stress of the LCC-S type compensation network of the wireless power transmission system is not considered, and the safety and the stability of the wireless power transmission system in working can not be ensured.
Disclosure of Invention
The invention aims to provide a wireless power transmission system and an optimization method thereof.
In order to achieve the purpose, the invention provides the following scheme:
a wireless power transfer system comprising:
the system comprises a power supply, an inverter, an LCC-S type compensation network, a rectifier bridge and a Boost converter;
the input end of the inverter is connected with the power supply, and the output end of the inverter is connected with the input end of the LCC-S type compensation network; the output end of the LCC-S type compensation network is connected with the input end of the rectifier bridge, and the output end of the rectifier bridge is connected with the Boost converter.
Optionally, the LCC-S type compensation network specifically includes:
the wireless energy transmission device comprises a primary side compensation circuit, a wireless energy transmission coil and a secondary side compensation circuit;
the input end of the primary side compensation circuit is connected with the output end of the inverter; the output end of the primary side compensation circuit is connected with the input end of the wireless energy transmission coil; the output end of the wireless energy transmission coil is connected with the input end of the secondary side compensation circuit; and the output end of the secondary side compensation circuit is connected with the input end of the rectifier bridge.
Optionally, the wireless energy transmission coil specifically includes:
the equivalent impedance of the primary coil and the equivalent impedance of the secondary coil; and the equivalent impedance of the primary side coil is coupled with the equivalent impedance of the secondary side coil.
Optionally, the primary side compensation circuit specifically includes:
the equivalent impedance of the series inductor of the primary side compensation circuit, the equivalent impedance of the series capacitor of the primary side compensation circuit and the equivalent impedance of the parallel capacitor of the primary side compensation circuit;
the first end of the equivalent impedance of the series inductor of the primary side compensation circuit is connected with the first output end of the inverter; the second end of the equivalent impedance of the series inductor of the primary side compensation circuit is respectively connected with the first end of the equivalent impedance of the series capacitor of the primary side compensation circuit and the first end of the equivalent impedance of the parallel capacitor of the primary side compensation circuit; the second end of the equivalent impedance of the primary side compensation circuit series capacitor is connected with the first end of the equivalent impedance of the primary side coil; and the second end of the equivalent impedance of the parallel capacitor of the primary side compensation circuit is respectively connected with the second output end of the inverter and the second end of the equivalent impedance of the primary side coil.
Optionally, the secondary side compensation circuit specifically includes:
the secondary side compensation circuit is connected with the equivalent impedance of the capacitor in series;
the first end of the equivalent impedance of the secondary side compensation circuit series capacitor is connected with the first end of the equivalent impedance of the secondary side coil; the second end of the equivalent impedance of the secondary side compensation circuit series capacitor is connected with the first input end of the rectifier bridge; and the second end of the equivalent impedance of the secondary coil is connected with the second input end of the rectifier bridge.
Alternatively to this, the first and second parts may,
the equivalent impedance of the primary coil specifically comprises: the primary coil self-inductance and the primary coil internal resistance; the primary coil self-inductance and the primary coil internal resistance are connected in series;
the secondary coil equivalent impedance specifically includes: the secondary coil self-inductance and the secondary coil internal resistance; the secondary coil self-inductance and the secondary coil internal resistance are connected in series;
the equivalent impedance of the series inductor of the primary side compensation circuit specifically comprises: the internal resistance of the series inductance of the primary side compensation circuit and the series inductance of the primary side compensation circuit; the primary side compensation circuit series inductor is connected in series with the internal resistance of the primary side compensation circuit series inductor;
the equivalent impedance of the series capacitor of the primary side compensation circuit specifically comprises: the internal resistance of the primary side compensation circuit series capacitor and the primary side compensation circuit series capacitor; the primary side compensation circuit series capacitor and the internal resistance of the primary side compensation circuit series capacitor are connected in series;
the equivalent impedance of the parallel capacitor of the primary side compensation circuit specifically comprises: the internal resistance of the parallel capacitor of the primary side compensation circuit and the parallel capacitor of the primary side compensation circuit; the internal resistances of the parallel capacitor of the primary side compensation circuit and the parallel capacitor of the primary side compensation circuit are connected in series;
the equivalent impedance of the secondary side compensation circuit series capacitor specifically comprises: the secondary side compensation circuit is connected with the internal resistance of the capacitor in series and the secondary side compensation circuit is connected with the internal resistance of the capacitor in series; and the secondary side compensation circuit series capacitor is connected in series with the internal resistance of the secondary side compensation circuit series capacitor.
The invention also provides an optimization method of the wireless power transmission system, which is applied to the wireless power transmission system and comprises the following steps:
acquiring element parameters of a wireless power transmission system and a load resistor connected with a Boost converter; the element parameters of the wireless power transmission system comprise the working duty ratio of a Boost converter and LCC-S type compensation network parameters;
and adjusting the efficiency of the wireless power transmission system and the electrical stress of the LCC-S type compensation network according to the element parameters of the wireless power transmission system and the load resistance connected with the Boost converter.
Optionally, the method further includes:
and adjusting the output impedance angle of the inverter according to the element parameters of the wireless power transmission system.
Optionally, the adjusting the efficiency of the wireless power transmission system and the electrical stress of the LCC-S type compensation network according to the element parameters of the wireless power transmission system and the load resistance connected to the Boost converter specifically includes:
adjusting an efficiency η of the wireless power transmission system according to the following formulatrans：
Figure BDA0002298482760000041
Wherein the content of the first and second substances,
Figure BDA0002298482760000042
Figure BDA0002298482760000043
Figure BDA0002298482760000044
in the formula IORepresenting the input current of the rectifier bridge, IINRepresenting the inverter output current, r (Z)Re) Represents ZReReal part of r (Z)IN) Represents ZINReal part of, ZReRepresenting the input impedance of the rectifier bridge, ZINRepresenting the inverter output impedance, Z12Representing the first mutual impedance, Z, of an LCC-S type compensation network22Representing the second self-impedance of the LCC-S type compensation network, D representing the working duty ratio of the Boost converter, RLRepresenting the resistance of a load connected to the Boost converter, ZMRepresenting the mutual inductance impedance, Z, of the primary and secondary windingsp2Representing the equivalent impedance, Z, of the parallel capacitance of the primary compensation circuitp1Representing the equivalent impedance, Z, of the series capacitance of the primary compensation circuit1Representing the equivalent impedance of the primary winding, Zs1Representing the equivalent impedance, Z, of the series capacitance of the secondary compensation circuit2Representing the equivalent impedance of the secondary coil;
is regulated according to the following formulaElectrical stress of the LCC-S type compensation network
Figure BDA0002298482760000045
Figure BDA0002298482760000046
Wherein the content of the first and second substances,
Figure BDA0002298482760000047
Z21＝Z12
in the formula of UINRepresenting the inverter output voltage, Z21Representing the second mutual impedance, Z, of the LCC-S type compensation network11Representing the first self-impedance, Z, of an LCC-S type compensation networkL11Representing the equivalent impedance of the series inductance of the primary compensation circuit.
Optionally, the adjusting an output impedance angle of the inverter according to the element parameter of the wireless power transmission system specifically includes:
adjusting an output impedance angle θ of the inverter according to the following equation:
Figure BDA0002298482760000051
wherein the content of the first and second substances,
Figure BDA0002298482760000052
Figure BDA0002298482760000053
in the formula, I (Z)IN) Represents ZINThe imaginary part of (a), omega, represents the operating frequency of the wireless power transmission system, omega0Denotes the resonant frequency, Cp1Representing the series capacitance of the primary compensation circuit, Cp2Representing the parallel capacitance of the primary compensation circuit, L1Representing the self-inductance of the primary coil; vOUTRepresenting the value of the load voltage, U, connected to the Boost converterdRepresenting the DC bus voltage of the inverter, M representing the mutual inductance of the primary coil and the secondary coil, ZrefRepresenting the equivalent impedance of the secondary winding to the primary winding.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a wireless power transmission system and an optimization method thereof, wherein a Boost converter is added in the wireless power transmission system, the transmission efficiency of the wireless power transmission system and the electrical stress of an LCC-S type compensation network of the wireless power transmission system are considered, the efficiency of the wireless power transmission system and the electrical stress of the LCC-S type compensation network are adjusted by changing the duty ratio of the Boost converter, and the wireless power transmission system has the advantages of improving the safety and stability of the wireless power transmission system during working.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a diagram illustrating a structure of a wireless power transmission system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an LCC-S type compensation network topology according to an embodiment of the present invention;
fig. 3 is a flowchart of an optimization method of a wireless power transmission system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a wireless power transmission system and an optimization method thereof.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Examples
Fig. 1 is a structural diagram of a wireless power transmission system according to an embodiment of the present invention, and as shown in fig. 1, the embodiment provides a wireless power transmission system, including: a direct current power supply 201, an inverter 202, an LCC-S type compensation network, a rectifier bridge 206 and a Boost converter 207. The input end of the inverter is connected with the power supply, and the output end of the inverter is connected with the input end of the LCC-S type compensation network; the output end of the LCC-S type compensation network is connected with the input end of a rectifier bridge, and the output end of the rectifier bridge is connected with a Boost converter. The Boost converter is connected to a load 208.
The LCC-S type compensation network specifically comprises: a primary side compensation circuit 203, a wireless energy transfer coil 204 and a secondary side compensation circuit 205. The input end of the primary side compensation circuit is connected with the output end of the inverter; the output end of the primary side compensation circuit is connected with the input end of the wireless energy transmission coil; the output end of the wireless energy transmission coil is connected with the input end of the secondary side compensation circuit; the output end of the secondary side compensation circuit is connected with the input end of the rectifier bridge.
Fig. 2 is a schematic diagram of an LCC-S type compensation network topology according to an embodiment of the present invention, as shown in fig. 2,
wireless energy transfer coil specifically includes: equivalent impedance Z of primary coil1And secondary coil equivalent impedance Z2(ii) a The equivalent impedance of the primary coil is coupled with the equivalent impedance of the secondary coil. The equivalent impedance of the primary coil specifically comprises: self-inductance L of primary coil1And internal resistance R of primary coil1(ii) a The self-inductance of the primary coil and the internal resistance of the primary coil are connected in series. The secondary coil equivalent impedance specifically includes: secondary coil self-inductance L2And secondary coil internal resistance R2(ii) a The self-inductance of the secondary coil and the internal resistance of the secondary coil are connected in series.
The primary side compensation circuit specifically comprises: equivalent impedance Z of series inductor of primary side compensation circuitL11Equivalent impedance Z of series capacitor of primary side compensation circuitp1Equivalent impedance Z of parallel capacitor with primary side compensation circuitp2. The first end of the equivalent impedance of the series inductor of the primary side compensation circuit is connected with the first output end of the inverter; the second end of the equivalent impedance of the series inductor of the primary side compensation circuit is respectively connected with the first end of the equivalent impedance of the series capacitor of the primary side compensation circuit and the first end of the equivalent impedance of the parallel capacitor of the primary side compensation circuit; the second end of the equivalent impedance of the primary side compensation circuit series capacitor is connected with the first end of the equivalent impedance of the primary side coil; and the second end of the equivalent impedance of the parallel capacitor of the primary side compensation circuit is respectively connected with the second output end of the inverter and the second end of the equivalent impedance of the primary side coil.
Equivalent impedance Z of series inductor of primary side compensation circuitL11The method specifically comprises the following steps: primary side compensation circuit series inductance R11Internal resistance L of series inductor connected with primary side compensation circuit11(ii) a The primary side compensation circuit series inductance and the internal resistance of the primary side compensation circuit series inductance are connected in series. Equivalent impedance Z of series capacitor of primary side compensation circuitp1The method specifically comprises the following steps: primary side compensation circuit series capacitor Cp1Internal resistance R of capacitor connected in series with primary side compensation circuitp1(ii) a And the internal resistances of the primary side compensation circuit series capacitor and the primary side compensation circuit series capacitor are connected in series. Equivalent impedance Z of parallel capacitor of primary side compensation circuitp2The method specifically comprises the following steps: primary side compensation circuit parallel capacitor Cp2Internal resistance R of capacitor connected in parallel with primary side compensation circuitp2(ii) a And the internal resistances of the parallel capacitor of the primary side compensation circuit and the parallel capacitor of the primary side compensation circuit are connected in series.
The secondary side compensation circuit specifically comprises: equivalent impedance Z of secondary side compensation circuit series capacitors1. The second side of the compensation circuit is connected with the equivalent impedance of the capacitorOne end of the secondary side coil is connected with the first end of the equivalent impedance of the secondary side coil; the second end of the equivalent impedance of the secondary side compensation circuit series capacitor is connected with the first input end of the rectifier bridge; and the second end of the equivalent impedance of the secondary coil is connected with the second input end of the rectifier bridge. Equivalent impedance Z of secondary side compensation circuit series capacitors1The method specifically comprises the following steps: secondary side compensation circuit series capacitor Cs1Internal resistance R of capacitor connected in series with secondary side compensation circuits1(ii) a The secondary side compensation circuit series capacitor and the secondary side compensation circuit series capacitor are connected in series.
Fig. 3 is a flowchart of an optimization method of a wireless power transmission system according to an embodiment of the present invention, and as shown in fig. 3, the optimization method of the wireless power transmission system is applied to the wireless power transmission system, and the method includes:
step 301: acquiring element parameters of a wireless power transmission system and a load resistor connected with a Boost converter; the element parameters of the wireless power transmission system comprise the working duty ratio of a Boost converter and LCC-S type compensation network parameters.
Step 302: and adjusting the efficiency of the wireless power transmission system and the electric stress of the LCC-S type compensation network according to the element parameters of the wireless power transmission system and the load resistance connected with the Boost converter.
Determining the variation range of a load connected with the Boost converter, and then obtaining the impedance transformation relation of the Boost converter according to the input and output characteristics of the Boost converter: zDC＝(1-D)2RL。
Modeling a wireless power transmission system to obtain parameters of a two-port network;
Figure BDA0002298482760000081
adjusting an efficiency η of a wireless power transfer system according to the following formulatrans：
Figure BDA0002298482760000082
Wherein the content of the first and second substances,
Figure BDA0002298482760000083
Figure BDA0002298482760000084
Figure BDA0002298482760000085
in the formula IORepresenting the input current of the rectifier bridge, IINRepresenting the inverter output current, UORepresenting the input voltage of the rectifier bridge, r (Z)Re) Represents ZReReal part of r (Z)IN) Represents ZINReal part of, ZReRepresenting the input impedance of the rectifier bridge, ZINRepresenting the inverter output impedance, Z12Representing the first mutual impedance, Z, of an LCC-S type compensation network22Representing the second self-impedance of the LCC-S type compensation network, D representing the working duty ratio of the Boost converter, RLRepresenting the resistance of a load connected to the Boost converter, ZMRepresenting the mutual inductance impedance, Z, of the primary and secondary windingsp2Representing the equivalent impedance, Z, of the parallel capacitance of the primary compensation circuitp1Representing the equivalent impedance, Z, of the series capacitance of the primary compensation circuit1Representing the equivalent impedance of the primary winding, Zs1Representing the equivalent impedance, Z, of the series capacitance of the secondary compensation circuit2Representing the equivalent impedance of the secondary coil;
adjusting the electrical stress of an LCC-S type compensation network according to the following formula
Figure BDA0002298482760000086
Figure BDA0002298482760000087
Wherein the content of the first and second substances,
Figure BDA0002298482760000088
Z21＝Z12
in the formula of UINRepresenting the inverter output voltage, Z21Representing the second mutual impedance, Z, of the LCC-S type compensation network11Representing the first self-impedance, Z, of an LCC-S type compensation networkL11Representing the equivalent impedance of the series inductance of the primary compensation circuit.
Step 303: and adjusting the output impedance angle of the inverter according to the element parameters of the wireless power transmission system.
The output impedance angle θ of the inverter is adjusted according to the following equation:
Figure BDA0002298482760000091
wherein the content of the first and second substances,
Figure BDA0002298482760000092
Figure BDA0002298482760000093
in the formula, I (Z)IN) Represents ZINThe imaginary part of (a), omega, represents the operating frequency of the wireless power transmission system, omega0Denotes the resonant frequency, Cp1Representing the series capacitance of the primary compensation circuit, Cp2Representing the parallel capacitance of the primary compensation circuit, L1Representing the self-inductance of the primary coil; vOUTRepresenting the value of the load voltage, U, connected to the Boost converterdRepresenting the DC bus voltage of the inverter, M representing the mutual inductance of the primary coil and the secondary coil, ZrefRepresenting the equivalent impedance of the secondary winding to the primary winding.
Further, in the above-mentioned case,
Figure BDA0002298482760000094
Figure BDA0002298482760000095
Figure BDA0002298482760000096
Figure BDA0002298482760000097
optimal load point R of coil of wireless power transmission systemopt：
Figure BDA0002298482760000098
In the formula, k is the coupling coefficient of the wireless energy transmission coil, Q1 is the quality factor of the primary coil, and Q2 is the quality factor of the secondary coil.
According to the invention, the working duty ratio D of the Boost converter is properly arranged on the secondary side to optimize the efficiency of the system and compensate the stress of the network, and the working duty ratio D of the Boost converter is adjusted to change ZReWhen Z isReEfficiency eta of wireless electric energy transmission system when changedtransStress U of compensation networkpress_Cs1And the output impedance angle theta of the inverter are changed along with the change of the output impedance angle theta, so that the aim of improving the system characteristic is fulfilled. The invention adopts the DC/DC converter (namely Boost converter) which is easy to design, the adopted LCC-S type compensation network has the characteristics of high stability, easy qualitative analysis and strong decouplability, the simplification is easy to realize in the design process of the system, the transmission efficiency, the compensation network electrical stress and the output impedance angle condition of the inverter of the considered system are all factors which need to be considered in the practical application of the wireless electric energy transmission system, and the universality is realized.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.

Claims (3)

1. An optimization method of a wireless power transmission system is applied to the wireless power transmission system, and the wireless power transmission system comprises the following steps: the power supply, an inverter, an LCC-S type compensation network, a rectifier bridge and a Boost converter, wherein the input end of the inverter is connected with the power supply, the output end of the inverter is connected with the input end of the LCC-S type compensation network, the output end of the LCC-S type compensation network is connected with the input end of the rectifier bridge, and the output end of the rectifier bridge is connected with the Boost converter, and the method comprises the following steps:
acquiring element parameters of a wireless power transmission system and a load resistor connected with a Boost converter; the element parameters of the wireless power transmission system comprise the working duty ratio of a Boost converter and LCC-S type compensation network parameters;
adjusting the efficiency of the wireless power transmission system and the electrical stress of the LCC-S type compensation network according to the element parameters of the wireless power transmission system and the load resistance connected with the Boost converter, and specifically comprises:
adjusting an efficiency η of the wireless power transmission system according to the following formulatrans：
Figure FDA0002789587560000011
Wherein the content of the first and second substances,
Figure FDA0002789587560000012
Figure FDA0002789587560000013
Figure FDA0002789587560000014
in the formula IORepresenting the input current of the rectifier bridge, IINRepresenting the inverter output current, r (Z)Re) Represents ZReReal part of r (Z)IN) Represents ZINReal part of, ZReRepresenting the input impedance of the rectifier bridge, ZINRepresenting the inverter output impedance, Z12Representing the first mutual impedance, Z, of an LCC-S type compensation network22Representing the second self-impedance of the LCC-S type compensation network, D representing the working duty ratio of the Boost converter, RLRepresenting the resistance of a load connected to the Boost converter, ZMRepresenting the mutual inductance impedance, Z, of the primary and secondary windingsp2Representing the equivalent impedance, Z, of the parallel capacitance of the primary compensation circuitp1Representing the equivalent impedance, Z, of the series capacitance of the primary compensation circuit1Representing the equivalent impedance of the primary winding, Zs1Representing the equivalent impedance, Z, of the series capacitance of the secondary compensation circuit2Representing the equivalent impedance of the secondary coil;
adjusting the electrical stress of the LCC-S type compensation network according to the following formula
Figure FDA0002789587560000015
Figure FDA0002789587560000016
Wherein the content of the first and second substances,
Figure FDA0002789587560000017
Z21＝Z12
in the formula of UINRepresenting the inverter output voltage, Z21To representSecond mutual impedance, Z, of LCC-S type compensation network11Representing the first self-impedance, Z, of an LCC-S type compensation networkL11Representing the equivalent impedance of the series inductance of the primary compensation circuit.
2. The method of optimizing a wireless power transfer system according to claim 1, further comprising:
and adjusting the output impedance angle of the inverter according to the element parameters of the wireless power transmission system.
3. The method for optimizing the wireless power transmission system according to claim 2, wherein the adjusting the output impedance angle of the inverter according to the parameters of the components of the wireless power transmission system specifically comprises:
adjusting an output impedance angle θ of the inverter according to the following equation:
Figure FDA0002789587560000021
wherein the content of the first and second substances,
Figure FDA0002789587560000022
Figure FDA0002789587560000023
in the formula, I (Z)IN) Represents ZINThe imaginary part of (a), omega, represents the operating frequency of the wireless power transmission system, omega0Denotes the resonant frequency, Cp1Representing the series capacitance of the primary compensation circuit, Cp2Representing the parallel capacitance of the primary compensation circuit, L1Representing the self-inductance of the primary coil; vOUTRepresenting the value of the load voltage, U, connected to the Boost converterdRepresenting the DC bus voltage of the inverter, M representing the mutual inductance of the primary coil and the secondary coil, ZrefIndicating secondary side loopTo the equivalent impedance of the primary coil.
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