CN113315254A - Current gain variable constant current output wireless power transmission system - Google Patents

Current gain variable constant current output wireless power transmission system Download PDF

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CN113315254A
CN113315254A CN202110480789.5A CN202110480789A CN113315254A CN 113315254 A CN113315254 A CN 113315254A CN 202110480789 A CN202110480789 A CN 202110480789A CN 113315254 A CN113315254 A CN 113315254A
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inductance
coil
constant current
transmission system
power transmission
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朱国荣
张迪
陆江华
王菁
向馗
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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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

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Abstract

The invention relates to a current gain variable constant current output wireless power transmission system which comprises a power transmitter and a plurality of different power receivers, wherein the power transmitter comprises a full-bridge inverter, an LCC compensation topological circuit and a transmitting coil, the power receivers comprise a full-bridge rectifier and a receiving coil, the LCC compensation topological circuit, the transmitting coil and the receiving coil form a resonant cavity circuit, and the resonant cavity circuit is used for realizing constant current output irrelevant to a load and inputting pure resistance. The current gain variable constant current output wireless power transmission system provided by the invention enables a single power transmitter to be matched with power receivers with different powers, and improves the compatibility of the power transmitter and the power receivers.

Description

Current gain variable constant current output wireless power transmission system
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a current gain variable constant current output wireless power transmission system.
Background
The wireless energy transmission technology is more and more favored by people due to the advantages of isolation, safety, convenience, reliability and the like, and is applied to many fields nowadays. As one of wireless power transmission technologies, an inductive power transmission technology is based on an electromagnetic induction principle to realize contactless power transmission, and has the advantages of safe operation, convenience, flexibility, low maintenance cost, good user experience and the like, and the technology gradually receives more and more attention and research.
In practical application, the existing inductive energy transmission system needs to output a constant current irrelevant to a load to meet the load power supply requirement of a specific application occasion, for example, the constant current output irrelevant to the load can be applied to LED wireless lighting and lithium battery charging; meanwhile, the input pure-resistance characteristic of the resonant network in the system, which is irrelevant to the load, can increase the power density of the system and reduce the circulating current loss of the system. At present, the load forms in the induction type energy transmission system are various, and the electric energy transmitter and the electric energy receiver can only be matched one to one and cannot be freely compatible.
Disclosure of Invention
In view of the above, there is a need to provide a current gain variable constant current output wireless power transmission system, which is used to solve the problem that in the prior art, a power transmitter and a power receiver can only be matched one-to-one and cannot be compatible arbitrarily.
The invention provides a current gain variable constant current output wireless power transmission system which comprises a power transmitter and a plurality of different power receivers, wherein the power transmitter comprises a full-bridge inverter, an LCC compensation topological circuit and a transmitting coil, the power receivers comprise a full-bridge rectifier and a receiving coil, the LCC compensation topological circuit, the transmitting coil and the receiving coil form a resonant cavity circuit, and the resonant cavity circuit is used for realizing constant current output irrelevant to a load and inputting pure resistance.
Further, the LCC compensation topology circuit comprises an inductor LpsCapacitor CpsAnd a capacitor CppSaid inductance LpsOne end of the inductor L is connected with one output end of the full-bridge inverterpsThe other ends of the two capacitors are respectively connected with a capacitor CpsOne terminal of and a capacitor CppOne terminal of said capacitor CppAnd the other end of the full-bridge inverter is connected with the other output end of the full-bridge inverter.
Further, the transmitting coil is an inductance coil LpThe receiving coil is an inductance coil LsSaid inductance coil LpAre respectively connected with a capacitor CpsAnother terminal of (1) and a capacitor CppThe other end of (1), the inductance coil LpAnd an inductance coil LsAre coupled with each other.
Further, the ratio of the output current to the input voltage of the resonant cavity circuit satisfies an expression
Figure BDA0003048489360000021
Wherein, the IabIs the output current of the resonant cavity circuit, VABOf the resonant cavity circuit is an input voltage of L'ccIs a capacitor CpsAnd an inductance coil LpThe series equivalent inductance of the self-inductance equivalent inductance, M is an inductance coil LpAnd an inductance coil LsMutual inductance of, said ωccIs the angular frequency of the system.
Further, the angular frequency ωccAnd a capacitor CppThe following formula is satisfied: omegacc＝2πfcc，
Figure BDA0003048489360000022
Cpp＝C′cc1+C′cc2，
Figure BDA0003048489360000023
Wherein, the fccIs the resonant frequency of the system, L'pIs an inductance coil LpSelf-inductance equivalent inductance.
Further, the resonant cavity circuit realizes pure input resistance, and specifically includes: enabling the resonant cavity circuit to meet a resonance condition formula to realize pure resistance input, wherein the resonance condition formula is
ωcc 2C′cc1Ls′M+ωcc 2Lcc′M·(C′cc1+C′cc2)+ωcc 2C′cc1Ls′Lcc′-M＝0
Wherein, L'sIs an inductance coil LsSelf-inductance equivalent inductance, L'ccIs an inductance coil LpThe self-inductance equivalent inductance is the equivalent inductance in series.
Further, the input impedance corresponding to the realization of the input pure resistance is
Figure BDA0003048489360000031
Wherein Z isinccFor input impedance, said RacThe equivalent resistance of the full-bridge rectifier and the load to the alternating current side is converted.
Further, the inductance coil LpSelf-inductance equivalent inductance L'p＝LpM, inductor LsSelf-inductance equivalent inductance L's＝Ls-M, resonant cavity circuit input AC voltage
Figure BDA0003048489360000032
Equivalent resistance of full bridge rectifier and load converted to AC side
Figure BDA0003048489360000033
The current gain variable constant current output wireless power transmission system according to claim 1, wherein the receiving coils of the different power receivers are arranged in the same ferrite mode, the aluminum plates are of the same size, the receiving coil windings of the different power receivers are all of circular planar spiral structures, the inner diameter, the outer diameter and the wire diameter of the winding are the same, the number of turns and the turn pitch are different, and the coupling coefficient of the transmitting coil and the receiving coil is a constant value.
Further, the full-bridge inverter comprises MOS tubes Q1, Q2, Q3 and Q4, wherein the source of the MOS tube Q2 is connected with the source of the MOS tube Q4, the drain of the MOS tube Q1 is connected with the drain of the MOS tube Q3, the source of the MOS tube Q1 is connected with the drain of the MOS tube Q2, and the source of the MOS tube Q3 is connected with the drain of the MOS tube Q4; the full-bridge rectifier comprises diodes D1, D2, D3, D4 and a capacitor CoA cathode of the diode D1 is connected to a cathode of the diode D2, and an anode of the diode D3 is connected to an anode of the diode D4, soThe anode of the diode D1 is connected with the cathode of the diode D3, the anode of the diode D2 is connected with the cathode of the diode D4, and the inductance coil LsAre connected to the anodes of diodes D1 and D2, respectively.
Compared with the prior art, the invention has the beneficial effects that: the wireless power transmission system comprises a power transmitter and a plurality of different power receivers, wherein the power transmitter comprises a full-bridge inverter, an LCC (lower control circuit) compensation topological circuit and a transmitting coil, the power receivers comprise a full-bridge rectifier and a receiving coil, the LCC compensation topological circuit, the transmitting coil and the receiving coil form a resonant cavity circuit, and the resonant cavity circuit is used for realizing constant current output irrelevant to a load and inputting pure resistance; the single electric energy transmitter can be matched with the electric energy receivers with different powers, and the compatibility of the electric energy transmitter and the electric energy receivers is improved.
Drawings
Fig. 1 is a block diagram of a current gain variable constant current output wireless power transmission system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an embodiment of a current gain variable constant current output wireless power transmission system according to the present invention;
FIG. 3 is a schematic diagram of an LCCN compensated wireless power transfer system according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an embodiment of an equivalent resonant cavity circuit provided in the present invention;
FIG. 5 is a model of an equivalent circuit of a resonant cavity circuit in a constant current output mode according to the present invention;
FIG. 6 is a plan view of the coil winding of three power receivers provided by the present invention;
FIG. 7 is a graph showing the variation of the number of turns of the transmitting coil and the number of turns of the receiving coil according to the present invention;
FIG. 8 is a graph illustrating the coupling coefficient versus the number of turns of the receiving coil according to the present invention;
FIG. 9 is a graph illustrating the self inductance of the receiving coil and the number of turns of the receiving coil according to the present invention;
FIG. 10 is a graph showing the variation of the input phase angle and equivalent transconductance versus the self-inductance of the load and receiving coil provided by the present invention;
fig. 11 is a graph showing the equivalent transconductance versus the self-inductance variation of the load and the receiving coil according to the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention provides a current gain variable constant current output wireless power transmission system, wherein the flow schematic diagram of one embodiment is shown in fig. 1, in the embodiment, the current gain variable constant current output wireless power transmission system comprises a power transmitter 1 and a plurality of different power receivers 2, the power transmitter comprises a full bridge inverter 11, an LCC compensation topology circuit 12 and a transmitting coil 13, the power receivers 2 comprise a full bridge rectifier 21 and a receiving coil 22, the LCC compensation topology circuit 12, the transmitting coil 13 and the receiving coil 22 form a resonant cavity circuit, and the resonant cavity circuit is used for realizing constant current output irrelevant to a load and inputting pure resistance.
In a specific embodiment, as shown in fig. 2, the power transmitter is coupled to the power receiver-1, the power receiver-2, and the power receiver-n to achieve high-efficiency and high-performance power transmission, that is, a single power transmitter can be matched with power receivers of different power levels, and the power receiver can be coupled to only a single power receiver during operation, but cannot be coupled to multiple receivers simultaneously.
As a preferred embodiment, the LCC compensation topology circuit comprises an inductor LpsCapacitor CpsAnd a capacitor CppSaid inductance LpsOne end of the inductor L is connected with one output end of the full-bridge inverterpsThe other ends of the two capacitors are respectively connected with a capacitor CpsOne terminal of and a capacitor CppOne terminal of said capacitor CppAnd the other end of the full-bridge inverter is connected with the other output end of the full-bridge inverter.
As a preferred embodiment, the transmitting coil comprises an inductor coil LpThe receiving coil comprises an inductance coil LsSaid inductance coil LpAre respectively connected with a capacitor CpsAnother terminal of (1) and a capacitor CppThe other end of (1), the inductance coil LpAnd an inductance coil LsAre coupled with each other.
In one embodiment, to facilitate analysis of the transmission characteristics of the system, any one of the power receivers is selected to be matched with the power transmitter, so as to obtain a schematic diagram of the LCCN-compensated wireless power transmission system, as shown in fig. 3. The LCCN compensation wireless electric energy transmission system mainly comprises: the system comprises a voltage source type full-bridge inverter, a transmitting end LCC compensation topology, a magnetic coupling structure and a full-bridge rectifier with capacitance filtering; the magnetic coupling structure comprises a transmitting coil and a receiving coil. Wherein Vin/IinIs the input voltage/current, V, of the systemAB/IABIs a resonant cavity circuit inputting alternating voltage/current, ZinIs the equivalent impedance of the resonant cavity circuit input, Lps、Cpp、CpsRespectively a transmitting end series compensation inductor, a transmitting end parallel compensation capacitor, a transmitting end series compensation capacitor, Lp/LsIs the self-inductance of the transmitter/receiver coil, M is the mutual inductance of the transmitter and receiver coils, Vab/IabThe resonant cavity circuit outputs AC voltage/current, and the resistor R for loadLIs represented by Vout/IoutIs the voltage/current output by the system to the load.
In a specific embodiment, fundamental wave equivalence is performed on the transmitting-end inverter and the receiving-end rectifier, and T-type equivalence is performed on the magnetic coupling structure, so as to obtain a circuit schematic diagram of the resonant cavity equivalent circuit and the resonant cavity equivalent circuit, as shown in fig. 4. L isp' and Ls' equivalent inductance of the self-inductance of the transmitting coil and the self-inductance of the receiving coil in the T-shaped model, and the transmission characteristic of the equivalent circuit of the resonant cavity can be considered as the transmission characteristic of the IPT system. In the equivalent circuit of the resonant cavity, the ratio of the output current to the input voltage (equivalent transconductance) is defined as GviThe input impedance of the system equivalent circuit is ZinK is a magnetic coupling junctionCoefficient of coupling of structure, RacThe equivalent resistance of the filter rectifying circuit with capacitance and the load converted to the alternating current side has the following expression,
Figure BDA0003048489360000061
Lp′＝Lp-M，Ls′＝Ls-M
Figure BDA0003048489360000062
Figure BDA0003048489360000063
as a preferred embodiment, the ratio of the output current to the input voltage of the resonant cavity circuit satisfies the expression
Figure BDA0003048489360000064
Wherein, the IabIs the output current of the resonant cavity circuit, VABOf the resonant cavity circuit is an input voltage of L'ccIs a capacitor CpsAnd an inductance coil LpThe series equivalent inductance of the self-inductance equivalent inductance, M is an inductance coil LpAnd an inductance coil LsMutual inductance of, said ωccIs the angular frequency of the system.
Decomposing the resonant cavity circuit shown in fig. 4 into a series connection of an LC network and an n-type circuit to obtain an equivalent circuit model of the resonant cavity circuit in a constant current output mode, as shown in fig. 5; cpsAnd L'pIs equivalent to an inductance L'cc，CppIs equivalent to C'cc1And C'cc2Parallel connection of equivalent circuit input impedance ZinccThe system resonant frequency is fccAngular frequency of ωcc. Obtaining the constant current output resonance condition of the equivalent circuit independent of the load, wherein the expression corresponding to the constant current output resonance condition is as follows,
ωcc＝2πfcc
Figure BDA0003048489360000071
Cpp＝C′cc1+C′cc2
Figure BDA0003048489360000072
and calculating to obtain GviThe expression is as follows,
Figure BDA0003048489360000073
as a preferred embodiment, the angular frequency ω isccAnd a capacitor CppThe following formula is satisfied: omegacc＝2πfcc，
Figure BDA0003048489360000074
Cpp＝C′cc1+C′cc2，
Figure BDA0003048489360000075
Wherein, the fccIs the resonant frequency of the system, L'pIs an inductance coil LpSelf-inductance equivalent inductance.
As a preferred embodiment, the resonant cavity circuit realizes pure input resistance, and specifically includes: enabling the resonant cavity circuit to meet a resonance condition formula to realize pure resistance input, wherein the resonance condition formula is
ωcc 2C′cc1Ls′M+ωcc 2Lcc′M·(C′cc1+C′cc2)+ωcc 2C′cc1Ls′Lcc′-M＝0
Wherein, L'sIs an inductance coil LsSelf-inductance equivalent inductance, L'ccIs an inductance coil LpThe self-inductance equivalent inductance is the equivalent inductance in series.
In one embodiment, under the condition of constant current output resonance, the resonant cavity circuit realizes input pure resistance, the formula of the resonance condition to be met is as follows,
ωcc 2C′cc1Ls′M+ωcc 2Lcc′M·(C′cc1+C′cc2)+ωcc 2C′cc1Ls′Lcc′-M＝0
calculating to obtain input impedance ZinccIs expressed as
Figure BDA0003048489360000081
Preferably, the input impedance corresponding to the realization of the input pure resistance is
Figure BDA0003048489360000082
Wherein Z isinccFor input impedance, said RacThe equivalent resistance of the full-bridge rectifier and the load to the alternating current side is converted.
As a preferred embodiment, the inductor LpSelf-inductance equivalent inductance L'p＝LpM, inductor LsSelf-inductance equivalent inductance L's＝Ls-M, resonant cavity circuit input AC voltage
Figure BDA0003048489360000083
Equivalent resistance of full bridge rectifier and load converted to AC side
Figure BDA0003048489360000084
As a preferred embodiment, the receiving coils of the different power receivers are laid with the same ferrite, the aluminum plates of the receiving coils have the same size, the receiving coil windings of the different power receivers are all circular planar spiral structures, the inner diameter, the outer diameter and the wire diameter of the receiving coils are the same, the number of turns and the turn-to-turn distance are different, and the coupling coefficient between the transmitting coil and the receiving coil is a fixed value.
In a specific embodiment, the ferrite laying modes used by different receiving coils need to be kept the same, the sizes of the aluminum plates are kept consistent, but the coil winding structure parameters are different; coil windings of different electric energy receivers are all in a circular plane spiral structure, the inner diameter, the outer diameter and the wire diameter of a wire of the coil windings are the same, and the number of turns and the turn-to-turn distance of the coil windings are different.
Under the conditions that the structural parameters of the transmitting coil are fixed, the transmission distance is unchanged, and the number of turns of the receiving coil is changed, the self-inductance of the transmitting coil is unchanged, the self-inductance of different receiving coils is different, and meanwhile, the coupling coefficient of the transmitting coil and the coupling coefficient of the receiving coil are unchanged.
Only the self-inductance of the receiving coil changes, the system can still meet the requirements of constant current output and pure resistance input which are irrelevant to the load, but the current gain is relevant to the self-inductance of the receiving coil; when the electric energy transmitter is matched with different electric energy receivers, the electric energy receivers output constant currents with different sizes regardless of loads, and the power supply requirements of loads with different rated currents are met.
As a preferred embodiment, the full-bridge inverter includes MOS transistors Q1, Q2, Q3 and Q4, the source of the MOS transistor Q2 is connected to the source of the MOS transistor Q4, the drain of the MOS transistor Q1 is connected to the drain of the MOS transistor Q3, the source of the MOS transistor Q1 is connected to the drain of the MOS transistor Q2, and the source of the MOS transistor Q3 is connected to the drain of the MOS transistor Q4; the full-bridge rectifier comprises diodes D1, D2, D3, D4 and a capacitor CoThe cathode of the diode D1 is connected with the cathode of the diode D2, the anode of the diode D3 is connected with the anode of the diode D4, the anode of the diode D1 is connected with the cathode of the diode D3, the anode of the diode D2 is connected with the cathode of the diode D4, and the inductance coil L is connected with the inductance coil LsAre connected to the anodes of diodes D1 and D2, respectively.
The full-bridge inverter is a voltage source full-bridge inverter, and a voltage source is connected to the drain of the MOS transistor Q1 and the source of the MOS transistor Q2; the full-bridge rectifier with capacitor filtering is arranged at the capacitor CoAre connected at both ends withLoad, capacitor CoFor filtering.
In one embodiment, the power transmitter is generally installed at a fixed location on the ground, and a single power transmitter can match different rated currents to require the power receiver to have great convenience in practical application. Specifically, the electric energy transmitter is kept unchanged, and when the system is matched with different electric energy receivers, constant current output irrelevant to load and pure resistance input can be realized, but the magnitude of output current can be changed.
The difference between different power receivers is that the receiving coils have different structures, and the winding plane structure diagram of the three power receivers is shown in fig. 6; the inner diameter and the outer diameter of a receiving coil winding, the wire diameter of a lead and the transmission distance are kept unchanged, the number of turns (turn interval) of the receiving coil is changed, and meanwhile, the structure of the transmitting coil is kept unchanged, so that the self-inductance of the transmitting coil is kept unchanged, the coupling coefficient is unchanged, the self-inductance of the receiving coil is changed, and the self-inductance is related to the number of turns. The self-inductance of the transmitter coil, the coupling coefficient, and the self-inductance of the receiver coil and the turn-number variation curve of the receiver coil are shown in fig. 7-9, respectively. FIG. 7 shows that the self-inductance of the transmitting coil is maintained at 284.5uH, the fluctuation range of the upper and lower parts is small, and the change of the number of turns of the receiving coil does not cause the change of the self-inductance of the transmitting coil; FIG. 8 shows that a change in the number of turns of the receiving coil does not cause a change in the coupling coefficient between the coils, and is maintained substantially at 0.458; fig. 9 shows that the self-inductance of the receiving coil is positively correlated with the number of turns, and the larger the number of turns, the larger the self-inductance of the coil. Fig. 10 shows the input phase angle and the equivalent transconductance versus load and receiving coil self-inductance variation curve, and fig. 11 shows that when the receiving coil self-inductance takes a certain fixed value, the equivalent transconductance is independent of the load and remains constant; the phase angle of the input impedance is plotted against the self-inductance of the load and the receiving coil, as shown in fig. 11, wherein the phase angle of the input impedance is constantly 0.
The transmitting coil is coupled with different self-inductance coils to realize constant current output and pure resistance input which are irrelevant to the load, and meanwhile, the receiving coils with different self-inductances output currents with different gains correspondingly; the function of high-efficiency and high-performance power transmission between a single electric energy transmitter and electric energy receivers with different rated currents is realized.
The invention discloses a current gain variable constant current output wireless power transmission system, which comprises a power transmitter and a plurality of different power receivers, wherein the power transmitter comprises a full-bridge inverter, an LCC (inductor-capacitor) compensation topological circuit and a transmitting coil; the single electric energy transmitter can be matched with the electric energy receivers with different power levels, the single electric energy transmitter can be matched with the electric energy receivers with different powers, the compatibility of the electric energy transmitter and the electric energy receivers is improved, high-efficiency and high-performance power transmission can be realized, and the number of the electric energy transmitters is reduced to a certain extent.
According to the technical scheme, the emitter adopts LCC topology to compensate coil leakage inductance, namely a novel LCCN unilateral compensation topology form is adopted, the coil structure comprises a high-permeability magnetic core and coil windings wound by litz wires, the coil windings of different electric energy receivers are all circular plane spiral structures, the inner diameter, the outer diameter and the wire diameter of the windings are the same, and the number of turns and the turn pitch of the windings are different. Under the conditions that the structural parameters of the transmitting coil are fixed, the transmission distance is unchanged, and the number of turns of the receiving coil is changed, the self-inductance of the transmitting coil is unchanged, the self-inductances of different receiving coils are different, and the coupling coefficient of the transmitting coil and the receiving coil is unchanged; the electric energy transmitter is coupled with electric energy receivers of different self-inductance receiving coils, the resonance conditions of constant current output and pure resistance input which are independent of a load can be met by LCCN topology, and the current gain is related to the self-inductance of the receiving coils; different self-inductance receiving coil electric energy receivers can output constant currents with different sizes irrelevant to loads, and pure resistance is input into a resonant cavity, so that the power supply requirements of loads with different rated currents are met.
In the technical scheme of the invention, the receiving coils in different electric energy receivers have different structures, the selection of the diode and the filter capacitor of the bridge type uncontrolled rectifier is related to the load and the output current, and the resistance value of the load is continuously changed; the laying mode of ferrite (PC40) used by different receiving coils needs to be kept the same, the size of the aluminum plate is kept consistent, but the coil winding structure parameters are different.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims (10)

1. The wireless power transmission system is characterized by comprising a power transmitter and a plurality of different power receivers, wherein the power transmitter comprises a full-bridge inverter, an LCC (lower control circuit) compensation topological circuit and a transmitting coil, the power receivers comprise a full-bridge rectifier and a receiving coil, the LCC compensation topological circuit, the transmitting coil and the receiving coil form a resonant cavity circuit, and the resonant cavity circuit is used for realizing constant current output and pure resistance input which are irrelevant to a load.
2. The current gain variable constant current output wireless power transmission system according to claim 1, wherein the LCC compensation topology circuit comprises an inductor LpsCapacitor CpsAnd a capacitor CppSaid inductance LpsOne end of the inductor L is connected with one output end of the full-bridge inverterpsThe other ends of the two capacitors are respectively connected with a capacitor CpsOne terminal of and a capacitor CppOne terminal of said capacitor CppAnd the other end of the full-bridge inverter is connected with the other output end of the full-bridge inverter.
3. The current gain variable constant current output wireless power transmission system according to claim 2, wherein the transmitter coil is an inductor coil LpThe receiving coil is an inductance coil LsSaid inductance coil LpAre respectively connected with a capacitor CpsAnother terminal of (1) and a capacitor CppThe other end of (1), the inductance coil LpAnd an inductance coil LsAre coupled with each other.
4. The current gain variable constant current output wireless power transmission system according to claim 3, wherein a ratio of an output current to an input voltage of the resonant cavity circuit satisfies an expression
Figure FDA0003048489350000011
Wherein, the IabIs the output current of the resonant cavity circuit, VABOf the resonant cavity circuit is an input voltage of L'ccIs a capacitor CpsAnd an inductance coil LpThe series equivalent inductance of the self-inductance equivalent inductance, M is an inductance coil LpAnd an inductance coil LsMutual inductance of, said ωccIs the angular frequency of the system.
5. The current gain variable constant current output wireless power transmission system according to claim 4, wherein the angular frequency ω isccAnd a capacitor CppThe following formula is satisfied: omegacc＝2πfcc，
Figure FDA0003048489350000021
Cpp＝C′cc1+C′cc2，
Figure FDA0003048489350000022
Wherein, the fccIs the resonant frequency of the system, L'pIs an inductance coil LpSelf-inductance equivalent inductance.
6. The current gain variable constant current output wireless power transmission system according to claim 5, wherein the resonant cavity circuit realizes input pure resistance, and specifically comprises: enabling the resonant cavity circuit to meet a resonance condition formula to realize pure resistance input, wherein the resonance condition formula is
ωcc 2C′cc1Ls′M+ωcc 2Lcc′M·(C′cc1+C′cc2)+ωcc 2C′cc1Ls′Lcc′-M＝0
Wherein, L'sIs an inductance coil LsSelf-inductance equivalent inductance, L'ccIs an inductance coil LpThe self-inductance equivalent inductance is the equivalent inductance in series.
7. The current gain variable constant current output wireless power transmission system according to claim 6, wherein the input impedance corresponding to the implementation of the input pure resistance is
Figure FDA0003048489350000023
Wherein Z isinccFor input impedance, said RacThe equivalent resistance of the full-bridge rectifier and the load to the alternating current side is converted.
8. The current gain variable constant current output wireless power transmission system according to claim 5 or 6, wherein the inductance coil LpSelf-inductance equivalent inductance L'p＝LpM, inductor LsSelf-inductance equivalent inductance L's＝Ls-M, resonant cavity circuit input AC voltage
Figure FDA0003048489350000024
Equivalent resistance of full bridge rectifier and load converted to AC side
Figure FDA0003048489350000025
9. The current gain variable constant current output wireless power transmission system according to claim 1, wherein receiving coils of different power receivers are provided with the same ferrite laying method and the same aluminum plate size, receiving coil windings of different power receivers are all circular planar spiral structures, inner diameters, outer diameters and wire diameters of the windings are the same, turns and turn pitches are different, and coupling coefficients of the transmitting coil and the receiving coil are constant values.
10. The current gain variable constant current output wireless power transmission system according to claim 1, wherein the full bridge inverter comprises MOS transistors Q1, Q2, Q3 and Q4, the source of the MOS transistor Q2 is connected with the source of the MOS transistor Q4, the drain of the MOS transistor Q1 is connected with the drain of the MOS transistor Q3, the source of the MOS transistor Q1 is connected with the drain of the MOS transistor Q2, and the source of the MOS transistor Q3 is connected with the drain of the MOS transistor Q4; the full-bridge rectifier comprises diodes D1, D2, D3, D4 and a capacitor CoThe cathode of the diode D1 is connected with the cathode of the diode D2, the anode of the diode D3 is connected with the anode of the diode D4, the anode of the diode D1 is connected with the cathode of the diode D3, the anode of the diode D2 is connected with the cathode of the diode D4, and the inductance coil L is connected with the inductance coil LsAre connected to the anodes of diodes D1 and D2, respectively.
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