CN111884357B - Wireless power transmission system efficiency optimization method based on switchable LCL circuit - Google Patents
Wireless power transmission system efficiency optimization method based on switchable LCL circuit Download PDFInfo
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- CN111884357B CN111884357B CN202010804532.6A CN202010804532A CN111884357B CN 111884357 B CN111884357 B CN 111884357B CN 202010804532 A CN202010804532 A CN 202010804532A CN 111884357 B CN111884357 B CN 111884357B
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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
-
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a wireless electric energy transmission system efficiency optimization method based on a switchable LCL circuit, which comprises the steps of arranging a high-frequency inverter at a transmitting end, and converting direct-current input voltage into high-frequency alternating-current voltage; taking the high-frequency alternating voltage as an equivalent voltage source to supply power to a receiving end in a resonance state; taking an equivalent voltage source as the input of a rectifier bridge in a receiving end, and outputting a rectifier bridge output voltage and a rectifier bridge output current through the rectifier bridge; calculating the load resistance of the wireless power transmission system according to the output voltage of the rectifier bridge and the output current of the rectifier bridge; closing one control switch in the receiving end and disconnecting the other control switches; and configuring network parameters of the LCL impedance transformation network circuit, and adjusting the load resistance of the wireless power transmission system to enable the adjusted load resistance of the wireless power transmission system to be equal to the load value when the efficiency of the wireless power transmission system is the highest. The invention needs relatively few components when optimizing the transmission efficiency, has relatively simple control and does not need to establish the communication of the transmitting end and the receiving end.
Description
Technical Field
The invention relates to the technical field of electric energy transmission, in particular to a wireless electric energy transmission system efficiency optimization method based on a switchable LCL circuit.
Background
The problem of optimizing the efficiency of a wireless power transmission system is one of the hot spots in the current power transmission technical field. For a typical wireless power transfer system, there is always an optimum load to maximize the efficiency of the system. However, in practical engineering applications, the load of the system tends to change with the change of the working condition, thereby causing the efficiency of the system to deviate from the maximum efficiency point. Currently, the main efficiency optimization methods for this problem include: 1) a maximum efficiency tracking control method based on a power electronic converter; 2) a frequency modulation control method; 3) efficiency optimization methods based on switchable circuits.
1) The maximum efficiency tracking control method based on the power electronic converter comprises the following steps: the method has the main working principle that when the system load is separated from the optimal load, the equivalent impedance of the system is converted into the optimal load impedance of the system through the power electronic converter, and therefore maximum-efficiency transmission is achieved. The main approaches to achieve this approach are: firstly, an inverter/active rectifier of a system is controlled by a phase-shifting control method; secondly, a direct current-direct current converter is added to realize equivalent impedance conversion. The above approach, while improving efficiency by optimizing the equivalent load, on the other hand also results in increased losses on the power electronic converter.
2) The frequency modulation control method comprises the following steps: for an open-loop wireless power transmission system, in addition to the resonant frequency of the system, there are two split frequencies so that the total input impedance of the system is resistive, and the total input impedance at the split frequencies is independent of the load size. The frequency modulation control method is to keep the system efficiency almost unchanged by tracking the splitting frequency when the load changes. However, in practical engineering applications, this method is limited by the ISM band range.
3) The efficiency optimization method based on the switchable circuit comprises the following steps: for a wireless power transmission system with a fixed compensation parameter, there will be an optimal load associated with the compensation parameter to maximize efficiency. Conversely, for a given load, a suitable set of compensation parameters may be selected to maximize system efficiency. Therefore, by introducing the switchable capacitor/inductor matrix, when the load is changed, the appropriate compensation capacitor/inductor parameter is switched, and the system efficiency can be improved. However, the method needs to introduce a large number of passive elements and switching devices, and is high in cost and low in reliability.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is directed to a method for optimizing efficiency of a wireless power transmission system based on a switchable LCL circuit, which is used to optimize the transmission efficiency of the wireless power transmission system in the prior art.
In order to achieve the above and other related objects, the present invention provides a method for optimizing efficiency of a wireless power transmission system based on a switchable LCL circuit, the wireless power transmission system including a transmitting end and a receiving end; the method comprises the following steps:
arranging a high-frequency inverter at the transmitting end, and converting a direct-current input voltage into a high-frequency alternating-current voltage through the high-frequency inverter; and the high-frequency alternating voltage is used as an equivalent voltage source to supply power to the receiving end in a resonance state;
the equivalent voltage source is used as the input of a rectifier bridge in the receiving end, and the corresponding rectifier bridge output voltage and the corresponding rectifier bridge output current are output through the rectifier bridge;
calculating the load resistance of the wireless power transmission system according to the output voltage of the rectifier bridge and the output current of the rectifier bridge;
closing one control switch in the receiving end and disconnecting the other control switches; and configuring network parameters of an LCL impedance transformation network circuit, and adjusting the load resistance of the wireless power transmission system to make the adjusted load resistance of the wireless power transmission system equal to the load value of the wireless power transmission system with the highest efficiency.
Optionally, the expression for determining the optimal load value when the efficiency of the wireless power transmission system is highest includes:
wherein R isLoptThe system load resistance is the system load resistance when the efficiency of the wireless power transmission system is the highest;
RTis the internal resistance of the transmitting coil;
RRis the internal resistance of the receiving coil;
omega is the working angular frequency of the wireless power transmission system;
m is the mutual inductance between the transmitter coil and the receiver coil.
Optionally, performing equivalent transformation on a load resistor of the wireless power transmission system by using an LCL impedance transformation network circuit; then there are:
wherein, XLThe inductance value of an inductor at one side in the LCL impedance transformation network is shown, and j is an imaginary number;
XCthe capacitance reactance value of a capacitor in the LCL impedance transformation network is shown, and j is an imaginary number;
RLTis a load resistance R of the wireless power transmission systemLEquivalent load value after LCL impedance transformation network circuit equivalent transformation;
according to the load resistance R of the wireless power transmission systemLConfiguring the network parameters of the LCL impedance transformation network circuit such that RLT＝RLopt。
Optionally, closing the ith control switch SiAnd disconnecting the other control switches to configure the network parameters of the LCL impedance transformation network circuit, wherein the network parameters comprise:
wherein, CRA resonance compensation capacitor for the receiving coil;
LRparasitic inductance of the receiving coil;
CSiLCL impedance transformation circuit capacitance controlled by ith control switch;
LSiLCL impedance transformation circuit inductance controlled by ith control switch;
LSjLCL impedance transformation circuit inductance controlled by jth control switch;
RLNthe system load value when the Nth control switch is closed;
RLiis the ith controlSystem load resistance when the system switch is closed;
RLi-1the load resistance of the system is when the i-1 th control switch is closed;
n is a system load resistor RLNumber or system load resistance R when performing discrete changesLThe number of equal fractions when continuously varied.
Optionally, a resonance compensation capacitor is arranged at the transmitting end, so that the transmitting end works in a resonance state; setting a resonance compensation capacitor at a receiving end to enable the receiving end to work in a resonance state;
forming a high-frequency alternating current with the same frequency as the high-frequency alternating voltage through the resonance compensation capacitor;
passing the high-frequency alternating current through a transmitting coil and generating a high-frequency alternating magnetic field around the transmitting coil;
and placing the receiving coil in the high-frequency alternating magnetic field for induction to generate high-frequency alternating voltage.
Optionally, the load resistor R of the wireless power transmission systemLWhen the LCL impedance conversion network circuit changes, the control switch in the receiving end is switched to control the connection of different LCL impedance conversion circuit inductors in the receiving end and corresponding LCL impedance conversion circuit capacitors to form different LCL impedance conversion network circuits; maintaining maximum efficiency for the wireless power transfer system.
As described above, the present invention provides a method for optimizing efficiency of a wireless power transmission system based on a switchable LCL circuit, which has the following advantages:
a high-frequency inverter is arranged at a transmitting end to convert a direct-current input voltage into a high-frequency alternating-current voltage; and the high-frequency alternating voltage is used as an equivalent voltage source to supply power to the receiving end in a resonance state; taking an equivalent voltage source as the input of a rectifier bridge in a receiving end, and outputting corresponding rectifier bridge output voltage and rectifier bridge output current through the rectifier bridge; calculating the load resistance of the wireless power transmission system according to the output voltage of the rectifier bridge and the output current of the rectifier bridge; closing one control switch in the receiving end and disconnecting the other control switches; and configuring network parameters of the LCL impedance transformation network circuit, and adjusting the load resistance of the wireless power transmission system to enable the adjusted load resistance of the wireless power transmission system to be equal to the load value when the efficiency of the wireless power transmission system is the highest. Compared with the efficiency optimization method of the existing wireless power transmission system, the method has high transmission efficiency, does not need to introduce an additional power electronic converter, reduces the loss of devices, and does not increase the switching loss on the power electronic converter, so the transmission efficiency is high. The invention can obtain the highest efficiency for one load value only by adding one switch, one inductor and one capacitor, and has great advantages particularly for discrete change load scenes, so that the required components are relatively few. The invention can realize the related control algorithm from the system model, has relatively simple control and does not need to establish the communication between the transmitting end and the receiving end. And the invention can save additional power electronic converters and wireless communication equipment.
Drawings
Fig. 1 is a schematic circuit diagram of a wireless power transmission system according to an embodiment;
fig. 2 is a schematic flowchart illustrating an efficiency optimization method of a wireless power transmission system based on a switchable LCL circuit according to an embodiment;
FIG. 3 is a schematic diagram of an equivalent circuit connection when the ith control switch is closed according to an embodiment;
FIG. 4 is a diagram illustrating an exemplary embodiment of a system load RLAnd (3) a circuit connection schematic diagram after impedance conversion.
Description of the element reference numerals
UDCDirect current input voltage
UINOutput voltage of inverter
ITCurrent of transmitting terminal
IRReceiving end current
USInput voltage of rectifier bridge
ISInput current of rectifier bridge
UOOutput of rectifier bridgeVoltage of
IOOutput current of rectifier bridge
Operating angular frequency of omega system
LTParasitic inductance of transmitting coil
CTResonance compensation capacitor of transmitting coil
RTInternal resistance of transmitting coil
LRParasitic inductance of receiving coil
CRResonance compensation capacitor of receiving coil
RRInternal resistance of receiving coil
LS1...LS...LSNLCL impedance transformation network circuit inductor
CS1...CSi、CSi+1...CSNLCL impedance transformation network circuit capacitor
S1...Si...SNControl switch
Mutual inductance between M transmitter coils and receiver coils
RLLoad resistance
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The wireless electric energy transmission system comprises a transmitting end and a receiving end, wherein the circuit connection is as shown in figure 1, and the working principle is as follows: the high-frequency inverter inputs DC voltage UDCConverted into a high-frequency alternating voltage and used for supplying power to a subsequent resonant network. Wherein, the resonance compensation capacitor CTThe function of the transformer is to enable the transmitting end to work in a resonance state, avoid introducing reactive current, form high-frequency alternating current with the same frequency as the high-frequency alternating voltage and pass through the transmitting coil, and generate a high-frequency alternating magnetic field around the transmitting coil. The receiving coil induces and generates high-frequency alternating-current voltage in the high-frequency alternating magnetic field, and the high-frequency alternating-current voltage is used as an equivalent voltage source to supply power for a receiving end circuit. Receiving end compensation capacitor CRThe function of the circuit is to enable the receiving end to work in a resonance state, and reactive current is prevented from being introduced. The LCL impedance transformation network at the receiving end has the function of transforming the actual load value of the system into the optimal equivalent load value of the system. Finally, the current at the receiving end supplies power to the load after being rectified by the rectifier bridge.
Generally, for a given wireless power transfer system, there is an optimum load value that maximizes system efficiency. Therefore, the present invention provides a method for optimizing efficiency of a wireless power transmission system based on a switchable LCL circuit, as shown in fig. 2, the method includes the following steps:
s100, arranging a high-frequency inverter at a transmitting end, and converting direct-current input voltage into high-frequency alternating-current voltage through the high-frequency inverter; and the high-frequency alternating voltage is used as an equivalent voltage source to supply power to the receiving end in a resonance state;
s200, taking an equivalent voltage source as the input of a rectifier bridge in a receiving end, and outputting corresponding rectifier bridge output voltage and rectifier bridge output current through the rectifier bridge;
s300, calculating load resistance of the wireless power transmission system according to the output voltage of the rectifier bridge and the output current of the rectifier bridge;
s400, closing one control switch in the receiving end and disconnecting the other control switches; and configuring network parameters of the LCL impedance transformation network circuit, and adjusting the load resistance of the wireless power transmission system to enable the adjusted load resistance of the wireless power transmission system to be equal to the load value when the efficiency of the wireless power transmission system is the highest.
According to the above description, as an example, the expression of the optimal load value when the efficiency of the wireless power transmission system is the highest is determined first, and there are:
wherein R isLoptThe system load resistance is the system load resistance when the efficiency of the wireless power transmission system is the highest;
RTis the internal resistance of the transmitting coil;
RRis the internal resistance of the receiving coil;
omega is the working angular frequency of the wireless electric energy transmission system;
m is the mutual inductance between the transmitter coil and the receiver coil.
As shown in fig. 3, a load resistor R of a wireless power transmission system is connected by an LCL impedance transformation network circuitLCarrying out equivalent transformation; then there are:
wherein, XLThe inductance value of an inductor at one side in the LCL impedance transformation network is shown, and j is an imaginary number;
XCthe capacitance reactance value of a capacitor in the LCL impedance transformation network is shown, and j is an imaginary number;
RLTload resistor R for wireless power transmission systemLEquivalent load value after LCL impedance transformation network circuit equivalent transformation;
according to the load resistance R of the wireless power transmission systemLConfiguring the network parameters of the LCL impedance transformation network circuit such that RLT＝RLopt. For a load RLReasonable configurationLCL network parameters of (1), implementing RLT＝RLoptAnd the equivalent load value of the system is the optimal load value of the system, and the system efficiency is highest at the moment.
At any time in the present invention, only one control switch is in the closed state. E.g. control switch SiWhen i is more than or equal to 1 and less than or equal to N is closed, the other control switches are required to be opened. As an example, as shown in FIG. 4, the present invention closes the ith control switch SiAnd disconnecting the other control switches to configure the network parameters of the LCL impedance transformation network circuit, wherein the network parameters comprise:
wherein, CRA resonance compensation capacitor for the receiving coil;
LRparasitic inductance of the receiving coil;
CSiLCL impedance transformation circuit capacitance controlled by ith control switch;
LSiLCL impedance transformation circuit inductance controlled by ith control switch;
LSjLCL impedance transformation circuit inductance controlled by jth control switch;
RLNthe system load value when the Nth control switch is closed;
RLithe system load resistance when the ith control switch is closed;
RLi-1the load resistance of the system is when the i-1 th control switch is closed;
n is a system load resistor RLNumber or system load resistance R when performing discrete changesLThe number of equal fractions when continuously varied. For the discrete variable load values, N is the number of the discrete variable load values, and system parameter design is carried out according to the method in the parameter configuration, so that the highest efficiency can be obtained at each discrete load point. For continuously variable load value, the load variation range of the system is determined to be [ R ]Lmin,RLmax]The interval [ R ]Lmin,RLmax]Dividing the data into N equal parts, and designing system parameters according to a method in parameter configuration; rLminFor minimum value of system load, RLmaxThe maximum value of the system load is taken. The larger the value of N is, the higher the average efficiency of the system is, and the higher the complexity of the system is.
Load resistor R of wireless power transmission systemLWhen the LCL impedance transformation network circuit changes, the inductance of different LCL impedance transformation circuits in the receiving end can be controlled to be connected with the capacitance of the corresponding LCL impedance transformation circuit through switching the control switch in the receiving end to form different LCL impedance transformation network circuits; the wireless power transmission system maintains the highest efficiency.
In another embodiment of the application, an expression of an optimal load value when the efficiency of the wireless power transmission system is the highest is determined; i.e. to determine
Remeasure rectifier bridge output voltage UOOutput current I of the rectifier bridgeO；
Respectively closing the control switches S in sequence1～SNObtaining the corresponding equivalent load resistance value RLT1～RLTN(ii) a Wherein the content of the first and second substances,
respectively calculate RLTi(1. ltoreq. i. ltoreq.N) and RLoptAnd determining the value of i at the minimum difference and marking as next;
opening the currently closed switch and closing switch Snext(ii) a And measuring the output voltage of the rectifier bridge againUOOutput current I of the rectifier bridgeOContinuing the optimization until R is achievedLT＝RLopt. When R isLT＝RLoptAnd then, taking the equivalent load value of the system as the optimal load value of the system, and obtaining the highest point of the system efficiency at the moment.
In summary, the present invention provides a method for optimizing efficiency of a wireless power transmission system based on a switchable LCL circuit, which has the following advantages:
a high-frequency inverter is arranged at a transmitting end to convert a direct-current input voltage into a high-frequency alternating-current voltage; and the high-frequency alternating voltage is used as an equivalent voltage source to supply power to the receiving end in a resonance state; taking an equivalent voltage source as the input of a rectifier bridge in a receiving end, and outputting corresponding rectifier bridge output voltage and rectifier bridge output current through the rectifier bridge; calculating the load resistance of the wireless power transmission system according to the output voltage of the rectifier bridge and the output current of the rectifier bridge; closing one control switch in the receiving end and disconnecting the other control switches; and configuring network parameters of the LCL impedance transformation network circuit, and adjusting the load resistance of the wireless power transmission system to enable the adjusted load resistance of the wireless power transmission system to be equal to the load value when the efficiency of the wireless power transmission system is the highest. Compared with the efficiency optimization method of the existing wireless power transmission system, the method has high transmission efficiency, does not need to introduce an additional power electronic converter, reduces the loss of devices, and does not increase the switching loss on the power electronic converter, so the transmission efficiency is high. The invention can obtain the highest efficiency for one load value only by adding one switch, one inductor and one capacitor, and has great advantages particularly for discrete change load scenes, so that the required components are relatively few. The invention can realize the related control algorithm from the system model, has relatively simple control and does not need to establish the communication between the transmitting end and the receiving end. And the invention can save additional power electronic converters and wireless communication equipment.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. A wireless electric energy transmission system efficiency optimization method based on a switchable LCL circuit is disclosed, wherein the wireless electric energy transmission system comprises a transmitting end and a receiving end; the method is characterized by comprising the following steps:
arranging a high-frequency inverter at the transmitting end, and converting a direct-current input voltage into a high-frequency alternating-current voltage through the high-frequency inverter; and the high-frequency alternating voltage is used as an equivalent voltage source to supply power to the receiving end in a resonance state;
the equivalent voltage source is used as the input of a rectifier bridge in the receiving end, and the corresponding rectifier bridge output voltage and the corresponding rectifier bridge output current are output through the rectifier bridge;
calculating the load resistance of the wireless power transmission system according to the output voltage of the rectifier bridge and the output current of the rectifier bridge;
closing one control switch in the receiving end and disconnecting the other control switches; configuring network parameters of an LCL impedance transformation network circuit, and adjusting the load resistance of the wireless power transmission system to make the adjusted load resistance of the wireless power transmission system equal to a load value when the efficiency of the wireless power transmission system is highest;
determining an expression of an optimal load value when the efficiency of the wireless power transmission system is highest, wherein the expression comprises the following steps:
wherein R isLoptThe system load resistance is the system load resistance when the efficiency of the wireless power transmission system is the highest;
RTis the internal resistance of the transmitting coil;
RRis the internal resistance of the receiving coil;
omega is the working angular frequency of the wireless power transmission system;
m is the mutual inductance between the transmitter coil and the receiver coil.
2. The method for optimizing the efficiency of the wireless power transmission system based on the switchable LCL circuit as claimed in claim 1, wherein the load resistance of the wireless power transmission system is equivalently transformed by an LCL impedance transformation network circuit; then there are:
wherein, XLThe inductance value of an inductor at one side in the LCL impedance transformation network is shown, and j is an imaginary number;
RLTis a load resistance R of the wireless power transmission systemLEquivalent load value after LCL impedance transformation network circuit equivalent transformation;
according to the load resistance R of the wireless power transmission systemLConfiguring the network parameters of the LCL impedance transformation network circuit such that RLT＝RLopt。
3. The method of claim 2, wherein an ith control switch S is closediAnd disconnecting the other control switches to configure the network parameters of the LCL impedance transformation network circuit, wherein the network parameters comprise:
wherein, CRA resonance compensation capacitor for the receiving coil;
LRparasitic inductance of the receiving coil;
CSiLCL impedance transformation circuit capacitance controlled by ith control switch;
LSiLCL impedance transformation circuit inductance controlled by ith control switch;
LSjLCL impedance transformation circuit inductance controlled by jth control switch;
RLNthe system load value when the Nth control switch is closed;
RLithe system load resistance when the ith control switch is closed;
RLi-1the load resistance of the system is when the i-1 th control switch is closed;
n is a system load resistor RLNumber or system load resistance R when performing discrete changesLThe number of equal fractions when continuously varied.
4. The method for optimizing efficiency of a wireless power transmission system based on a switchable LCL circuit as claimed in any one of claims 1 to 3, wherein a resonance compensation capacitor is disposed at the transmitting end to make the transmitting end operate in a resonance state; setting a resonance compensation capacitor at a receiving end to enable the receiving end to work in a resonance state;
forming a high-frequency alternating current with the same frequency as the high-frequency alternating voltage through the resonance compensation capacitor;
passing the high-frequency alternating current through a transmitting coil and generating a high-frequency alternating magnetic field around the transmitting coil;
and placing the receiving coil in the high-frequency alternating magnetic field for induction to generate high-frequency alternating voltage.
5. The method of claim 4, wherein the wireless power transfer system efficiency optimization method based on the switchable LCL circuit is characterized in that the wireless power transfer system efficiency optimization method is based on the switchable LCL circuitLoad resistance R of the systemLWhen the LCL impedance conversion network circuit changes, the control switch in the receiving end is switched to control the connection of different LCL impedance conversion circuit inductors in the receiving end and corresponding LCL impedance conversion circuit capacitors to form different LCL impedance conversion network circuits; maintaining maximum efficiency for the wireless power transfer system.
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