CN108718117B - Double-pickup three-phase dynamic wireless power transmission system with constant output voltage - Google Patents

Double-pickup three-phase dynamic wireless power transmission system with constant output voltage Download PDF

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CN108718117B
CN108718117B CN201810684925.0A CN201810684925A CN108718117B CN 108718117 B CN108718117 B CN 108718117B CN 201810684925 A CN201810684925 A CN 201810684925A CN 108718117 B CN108718117 B CN 108718117B
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transmitting coil
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CN108718117A (en
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符玲
李宏超
何正友
周坤卓
麦瑞坤
高仕斌
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Southwest Jiaotong University
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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 discloses a double-pickup three-phase dynamic wireless power transmission system with constant output voltage, belonging to the field of wireless induction power transmission; the electromagnetic coupling mechanism comprises a sending mechanism and a receiving mechanism, the sending mechanism comprises a flat magnetic core F1 and a transmitting coil arranged on the flat magnetic core F1, the receiving mechanism comprises a flat magnetic core F2 and a double-pickup receiving coil arranged at the bottom end of the flat magnetic core F2, and the length of the double-pickup receiving coil is 1.5 times that of the transmitting coil; the invention optimizes the length ratio of the receiving coil and the transmitting coil, adopts the double-pick receiving coil, ensures that the induced voltage fluctuation of the system reaches the minimum, the output voltage of the system is constant, and greatly improves the output power of the system.

Description

Double-pickup three-phase dynamic wireless power transmission system with constant output voltage
Technical Field
The invention belongs to the field of wireless induction power transmission, and particularly relates to a double-pickup three-phase dynamic wireless power transmission system with constant output voltage.
Background
The inductive power transmission technology is applied to power supply of high-power equipment such as rail transit trains, electric automobiles and the like, compared with the traditional power transmission technology in which a wire is directly and physically contacted, the inductive power transmission technology has no problems of contact sparks, electric leakage, influence of rain, snow, dust and the like in the working process, effectively improves the power supply safety and reliability, and is widely applied to the fields of built-in medical devices, consumer electronics, illumination, electric automobiles and the like.
The working principle of the induction power transmission system is as follows: the power frequency alternating current is rectified into direct current through a rectifier, the direct current is converted into high-frequency alternating current under the action of a high-frequency inverter, and the high-frequency alternating current excites a high-frequency magnetic field on a primary coil; a secondary energy pickup coil which is not directly contacted with the primary coil is coupled with a high-frequency magnetic field to induce a same-frequency alternating voltage, and the same-frequency alternating voltage is converted into an electric energy form required by the load through an electric energy conversion device of a secondary circuit to be supplied to the load, so that the non-contact transmission of energy is realized.
There are various ways to ensure constant output of a wireless power transmission system in the prior art, wherein the closest prior art is the patent number: the three-phase dynamic wireless power transmission system with constant output voltage of CN201711038905.8, which is overlapped by two adjacent transmitting coils, makes the sum of mutual inductance and fluctuation of all transmitting coils and receiving coils reach the minimum, so as to make the fluctuation of the output voltage of the system reach the minimum and ensure the output voltage of the system to be constant; although the patent can ensure the output voltage of the system to be constant, the single pick-up mode is adopted, the primary coils are mutually overlapped, the mutual inductance between the primary coils is large, the reactive power exchange is more, and the output power is low; therefore, a wireless power transmission system capable of improving the output power of the system while ensuring the output voltage to be constant is required.
Disclosure of Invention
The invention aims to: the invention provides a double-pickup three-phase dynamic wireless power transmission system with constant output voltage, which solves the problem that the output voltage of the existing wireless induction power transmission system fluctuates greatly in a moving state.
The technical scheme adopted by the invention is as follows:
the utility model provides a two dynamic wireless power transmission systems of three-phase that pick up of constant output voltage, includes DC power supply E, high frequency three-phase inverter H, resonance unit, elementary compensation capacitance, electromagnetic coupling mechanism, secondary compensation capacitance, rectification filter circuit K and the load R that connects in order, electromagnetic coupling mechanism includes sending mechanism and receiving mechanism, sending mechanism includes dull and stereotyped magnetic core F1 and sets up the transmitting coil on dull and stereotyped magnetic core F1, receiving mechanism includes dull and stereotyped magnetic core F2 and sets up the two receiving coil that pick up in dull and stereotyped magnetic core F2 bottom, the length of two receiving coil that pick up is 1.5 times of transmitting coil length.
Preferably, the dual pick-up receiving coil comprises a closely arranged receiving coil S1 and a receiving coil S2, and the same-name ends of the receiving coil S1 and the receiving coil S2 are connected in series in an inverted manner.
Preferably, the dual pick-up receive coil and the transmit coil are equal in width.
Preferably, the transmitting coil comprises a transmitting coil A1, a transmitting coil B1, a transmitting coil C1, a transmitting coil A2, a transmitting coil B2 and a transmitting coil C2, and two adjacent transmitting coils are abutted against each other; the transmitting coil a1 is connected to the phase a of the high-frequency three-phase inverter H, the transmitting coil B1 is connected to the phase B of the high-frequency three-phase inverter H, and the transmitting coil C1 is connected to the phase C of the high-frequency three-phase inverter H.
Preferably, the resonance unit comprises a resonance inductance LPAResonant inductor LPBResonant inductor LPCResonant capacitor CPAResonant capacitor CPBAnd a resonance capacitor CPC(ii) a The primary compensation capacitor comprises a primary compensation capacitor CTAPrimary compensation capacitor CTBAnd a primary compensation capacitor CTCThe secondary compensation capacitor comprises a secondary compensation capacitor CS1And a secondary compensation capacitor CS2；
The A-phase output end of the high-frequency three-phase inverter H sequentially passes through the resonant inductor LPAAnd a compensation capacitor CTAAnd a transmitting coil A1, i.e. a transmitting coil LTAConnected by a coil LTAThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPAConnected in parallel to a compensation capacitor CTAAnd a transmitting coil LTATwo ends;
b-phase output end of high-frequency three-phase inverter H sequentially passes through resonant inductor LPBAnd a compensation capacitor CTBAnd a transmitting coil B1, i.e. a transmitting coil LTBConnected by a coil LTBThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPBConnected in parallel to a compensation capacitor CTBAnd a transmitting coil LTBTwo ends;
c-phase output end of high-frequency three-phase inverter H sequentially passes through resonant inductor LPCAnd a compensation capacitor CTCAnd a transmitting coil C1, i.e. a transmitting coil LTCConnected by a coil LTCThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPCConnected in parallel to a compensation capacitor CTCAnd a transmitting coil LTCTwo ends;
receiving coil S1, i.e. receiving coil LS1The same name end of the capacitor is connected with a secondary compensation capacitor CS1And a machineOne input end of the current filter circuit K is connected with a receiving coil S2, namely a receiving coil LS2The same name end of the capacitor is connected with a secondary compensation capacitor CS2A receiving coil L connected with the other input end of the rectification filter circuit KS1The other end and a receiving coil LS2The other end is connected, and the output end of the rectification filter circuit K is connected with a load R.
Preferably, the total induced voltage of the double pick-up receiving coils is calculated as follows:
Figure GDA0003001224250000021
wherein the content of the first and second substances,
Figure GDA0003001224250000022
representing the phase voltage of the A phase output by the high-frequency three-phase inverter HAS1Representing a phase A transmitting coil to a receiving coil LS1Mutual inductance of (M)BS1Representing a B-phase transmitting coil versus a receiving coil LS1Mutual inductance of (M)CS1Representing a C-phase transmitting coil to a receiving coil LS1Mutual inductance of (M)AS2Representing a phase A transmitting coil to a receiving coil LS2Mutual inductance of (M)BS2Representing a B-phase transmitting coil versus a receiving coil LS2Mutual inductance of (M)CS2Representing a C-phase transmitting coil to a receiving coil LS2Mutual inductance of LPARepresenting the resonant inductance.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, by optimizing the length ratio of the receiving coil to the transmitting coil and reasonably arranging the positions of the flat magnetic core F1, the transmitting coil and the double-pickup receiving coil, the induced voltage fluctuation of the system is minimized, and the output voltage of the system is constant;
2. the invention has simple structure, only needs to optimize the structure of the receiving coil, does not need a control circuit, has no complex control strategy, and has convenient system implementation and high reliability;
3. the invention adopts a double-pick-up coil structure, thereby increasing the output power of the system to 93 percent at most;
4. the system of the invention is not influenced by the position of the receiving coil, can output the same voltage at any position of the track, and can realize dynamic induction power transmission.
5. The primary coils of the invention are not overlapped with each other, the mutual inductance between the primary coils is smaller, the reactive exchange is less, the system efficiency is high, and the output power is large.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of the circuit structure of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is an equivalent circuit diagram of the present invention;
FIG. 4 is a graph of mutual inductance and value for different pickup coil lengths of the present invention;
fig. 5 is a graph of the mutual inductance and variance for different pick-up coil lengths of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
A double-pick-up three-phase dynamic wireless power transmission system with constant output voltage,
the technical problem to be solved is as follows: the output voltage of the wireless induction power transmission system fluctuates greatly in a moving state;
the technical effects achieved are as follows: the primary coils are not overlapped with each other, the mutual inductance between the primary coils is small, the reactive power exchange is less, the system efficiency is high, and the output power is high due to the adoption of a double-pick-up coil structure; optimizing the length ratio of the receiving coil and the transmitting coil to ensure that the induced voltage fluctuation of the system is minimum and the output voltage of the system is constant;
the technical means adopted are as follows: the electromagnetic coupling mechanism comprises a sending mechanism and a receiving mechanism, the sending mechanism comprises a flat-plate magnetic core F1 and a transmitting coil arranged on the flat-plate magnetic core F1, the receiving mechanism comprises a flat-plate magnetic core F2 and a double-pick receiving coil arranged at the bottom end of the flat-plate magnetic core F2, and the length of the double-pick receiving coil is 1.5 times that of the transmitting coil;
the double pick-up receiving coil comprises a receiving coil S1 and a receiving coil S2 which are closely arranged, and the same-name ends of the receiving coil S1 and the receiving coil S2 are connected in series in an opposite way. The double pick-up receiving coil is equal in width to the transmitting coil.
The transmitting coils comprise a transmitting coil A1, a transmitting coil B1, a transmitting coil C1, a transmitting coil A2, a transmitting coil B2 and a transmitting coil C2, and two adjacent transmitting coils are abutted against each other; the transmitting coil a1 is connected to the phase a of the high-frequency three-phase inverter H, the transmitting coil B1 is connected to the phase B of the high-frequency three-phase inverter H, and the transmitting coil C1 is connected to the phase C of the high-frequency three-phase inverter H.
The resonant unit comprises a resonant inductor LPAResonant inductor LPBResonant inductor LPCResonant capacitor CPAResonant capacitor CPBAnd a resonance capacitor CPC(ii) a The primary compensation capacitor comprises a primary compensation capacitor CTAPrimary compensation capacitor CTBAnd a primary compensation capacitor CTCThe secondary compensation capacitor comprises a secondary compensation capacitor CS1And a secondary compensation capacitor CS2；
The A-phase output end of the high-frequency three-phase inverter H sequentially passes through the resonant inductor LPAAnd a compensation capacitor CTAAnd a transmitting coil A1, i.e. a transmitting coil LTAConnected by a coil LTAThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPAConnected in parallel to a compensation capacitor CTAAnd a transmitting coil LTATwo ends;
b-phase output end of high-frequency three-phase inverter H sequentially passes through resonant inductor LPBAnd a compensation capacitor CTBAnd a transmitting coil B1, i.e. a transmitting coil LTBConnected by a coil LTBThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPBConnected in parallel to a compensation capacitor CTBAnd a transmitting coil LTBTwo ends;
c-phase output end of high-frequency three-phase inverter H sequentially passes through resonant inductor LPCAnd a compensation capacitor CTCAnd a transmitting coil C1, i.e. a transmitting coil LTCConnected by a coil LTCThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPCConnected in parallel to a compensation capacitor CTCAnd a transmitting coil LTCTwo ends;
receiving coil S1, i.e. receiving coil LS1The same name end of the capacitor is connected with a secondary compensation capacitor CS1And a rectifying filterThe wave circuit K is connected at one input end, and the receiving coil S2 is the receiving coil LS2The same name end of the capacitor is connected with a secondary compensation capacitor CS2A receiving coil L connected with the other input end of the rectification filter circuit KS1The other end and a receiving coil LS2The other end is connected, and the output end of the rectification filter circuit K is connected with a load R.
The total induced voltage of the dual pick-up receive coils is calculated as follows:
Figure GDA0003001224250000051
wherein the content of the first and second substances,
Figure GDA0003001224250000052
representing the phase voltage of the A phase output by the high-frequency three-phase inverter HAS1Representing a phase A transmitting coil to a receiving coil LS1Mutual inductance of (M)BS1Representing a B-phase transmitting coil versus a receiving coil LS1Mutual inductance of (M)CS1Representing a C-phase transmitting coil to a receiving coil LS1Mutual inductance of (M)AS2Representing a phase A transmitting coil to a receiving coil LS2Mutual inductance of (M)BS2Representing a B-phase transmitting coil versus a receiving coil LS2Mutual inductance of (M)CS2Representing a C-phase transmitting coil to a receiving coil LS2Mutual inductance of LPARepresenting a resonant inductance;
the number of the primary coils is not limited because the primary coils are infinitely long tracks; the inductance values of the transmitting coil, the resonance unit and the receiving coil are from dozens of microhenries to thousands of microhenries according to different output levels and output voltage and current requirements;
the working principle is as follows: the calculation formula of the total induced voltage of the double pick-up receiving coils shows that when the three-phase inverter outputs the phase voltage
Figure GDA0003001224250000055
And a resonant inductor LPAWhile remaining constant, the total induced voltage is only related to the sum of the mutual inductances, which are calculated and analyzed to obtain the value of the sum of the mutual inductances for different pick-up coil lengths, as shown in fig. 4, where lSIndicating the length of the pick-up coilThe variance is used to measure the fluctuation amplitude, and the variance of the mutual inductance sum can be obtained at different lengths of the pick-up coil, as shown in fig. 5; according to experiments, when the length of the double-pick-up receiving coil is 1.5 times of that of the transmitting coil, the mutual inductance sum is minimum when the variance of the mutual inductance sum is minimum, the fluctuation of the longitudinal induction voltage is minimum, and the output voltage of the system is stable.
Example 1
The total induced voltage of the dual pick-up receive coils is calculated as follows:
Figure GDA0003001224250000053
wherein the content of the first and second substances,
Figure GDA0003001224250000054
representing the phase voltage of the A phase output by the high-frequency three-phase inverter HAS1Representing a phase A transmitting coil to a receiving coil LS1Mutual inductance of (M)BS1Representing a B-phase transmitting coil versus a receiving coil LS1Mutual inductance of (M)CS1Representing a C-phase transmitting coil to a receiving coil LS1Mutual inductance of (M)AS2Representing a phase A transmitting coil to a receiving coil LS2Mutual inductance of (M)BS2Representing a B-phase transmitting coil versus a receiving coil LS2Mutual inductance of (M)CS2Representing a C-phase transmitting coil to a receiving coil LS2Mutual inductance of LPARepresenting resonant inductance
Capacitance value of resonance Capacitance (CP)
Figure GDA0003001224250000061
The calculation is as follows:
Figure GDA0003001224250000062
capacitance value of compensation Capacitor (CT)
Figure GDA0003001224250000063
The calculation is as follows:
Figure GDA0003001224250000064
capacitance value of secondary compensation Capacitor (CS)
Figure GDA0003001224250000065
The calculation is as follows:
Figure GDA0003001224250000066
wherein, omega is the angular frequency of the system,
Figure GDA0003001224250000067
and
Figure GDA0003001224250000068
the inductance values of the transmitting coil, the resonance unit and the receiving coil are respectively; when the length of the receiving coil is 30cm,
Figure GDA0003001224250000069
190 muH; when the length of the transmitting coil is 20cm,
Figure GDA00030012242500000610
about 110 μ H;
Figure GDA00030012242500000611
the value is 80 muH;
the receiver coil S1, the receiver coil S2, and the flat core F2 move back and forth in the direction in which the transmitter coil a1, the transmitter coil B1, the transmitter coil C1, the transmitter coil a2, the transmitter coil B2, and the transmitter coil C2 are aligned;
in the embodiment, 6 transmitting coils are arranged, wherein the transmitting coil a1, the transmitting coil B1, the transmitting coil C1, and the phase a, the phase B and the phase C corresponding to the inverter H form one group, the remaining 3 groups form another group, and different groups are connected in parallel to the same inverter;
the power frequency alternating current is rectified into direct current through a rectifier, and the direct current is converted into high-frequency alternating current under the action of a high-frequency inverter; high-frequency alternating current excites a high-frequency magnetic field on a primary coil, a secondary double-pickup coil which is not directly contacted with the primary coil is coupled with the high-frequency magnetic field to induce same-frequency alternating voltage, and the same-frequency alternating voltage is converted into an electric energy form required by a load through an electric energy conversion device of a secondary circuit to be supplied to the load, so that non-contact transmission of energy is realized;
as shown in fig. 4 and 5, when the transmitting coil takes 20cm, it can be seen from the figure that when the length of the pickup coil is 30cm, the variance of the mutual inductance sum is minimum, that is, the fluctuation of the mutual inductance sum is minimum, and at this time, the fluctuation of the total induced voltage is also minimum, the output voltage of the system is stable, and the calculated output power reaches 93%.
Example 2
When the length of the receiving coil is 45cm,
Figure GDA00030012242500000612
about 320 μ H; when the length of the transmitting coil is 30cm,
Figure GDA00030012242500000613
about 190 μ H;
Figure GDA00030012242500000614
the value was 80 μ H. Experiments and calculation show that the transmitting coil is arranged on the flat magnetic core F1, the double-pick receiving coil is arranged under the flat magnetic core F1, the length ratio of the receiving coil to the transmitting coil is 1.5:1, the induced voltage fluctuation of the system is minimum, the output voltage can be guaranteed to be stable, and the output power reaches 91%.
Example 3
When the length of the receiving coil is 40cm,
Figure GDA0003001224250000071
about 160 μ H; when the length of the transmitting coil is 25cm,
Figure GDA0003001224250000072
about 270 μ H;
Figure GDA0003001224250000073
value of 80 muH. Experiments and calculation show that the dual-pick-up receiving coil is arranged under the flat magnetic core F1 and the transmitting coil is arranged on the flat magnetic core F1, the length ratio of the receiving coil to the transmitting coil is 1.5:1, the induced voltage fluctuation of the system is minimum, the output voltage can be guaranteed to be stable, and the output power reaches 90%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. The utility model provides a two pickup three-phase dynamic wireless power transmission systems that output voltage is invariable, includes DC power supply E, high frequency three-phase inverter H, resonance unit, elementary compensation capacitance, electromagnetic coupling mechanism, secondary compensation capacitance, rectification filter circuit K and the load R that connects in order, electromagnetic coupling mechanism includes sending mechanism and receiving mechanism, its characterized in that: the sending mechanism comprises a flat-plate magnetic core F1 and a transmitting coil arranged on the flat-plate magnetic core F1, the receiving mechanism comprises a flat-plate magnetic core F2 and a double-pick-up receiving coil arranged at the bottom end of the flat-plate magnetic core F2, and the length of the double-pick-up receiving coil is 1.5 times that of the transmitting coil;
the total induced voltage of the double pick-up receiving coils is calculated as follows:
Figure FDA0003001224240000011
wherein the content of the first and second substances,
Figure FDA0003001224240000012
indicating that the high-frequency three-phase inverter H outputs the a-phase voltage,
Figure FDA0003001224240000013
representing a phase A transmitting coil to a receiving coil
Figure FDA0003001224240000014
The mutual inductance of (a) is determined,
Figure FDA0003001224240000015
representing a B-phase transmitting coil to a receiving coil
Figure FDA0003001224240000016
The mutual inductance of (a) is determined,
Figure FDA0003001224240000017
representing C-phase transmitting coil to receiving coil
Figure FDA0003001224240000018
The mutual inductance of (a) is determined,
Figure FDA0003001224240000019
representing a phase A transmitting coil to a receiving coil
Figure FDA00030012242400000110
The mutual inductance of (a) is determined,
Figure FDA00030012242400000111
representing a B-phase transmitting coil to a receiving coil
Figure FDA00030012242400000112
The mutual inductance of (a) is determined,
Figure FDA00030012242400000113
representing C-phase transmitting coil to receiving coil
Figure FDA00030012242400000114
Mutual inductance of LPARepresenting the resonant inductance.
2. The constant-output-voltage dual-pick-up three-phase dynamic wireless power transmission system according to claim 1, wherein: the double pick-up receiving coil comprises a closely arranged receiving coil S1 and a receiving coil S2, and the same-name ends of the receiving coil S1 and the receiving coil S2 are connected in series in an inverted mode.
3. The constant-output-voltage dual-pick-up three-phase dynamic wireless power transmission system according to claim 2, wherein: the double pick-up receiving coil and the transmitting coil are equal in width.
4. The constant-output-voltage dual-pick-up three-phase dynamic wireless power transmission system according to claim 2, wherein: the transmitting coils comprise a transmitting coil A1, a transmitting coil B1, a transmitting coil C1, a transmitting coil A2, a transmitting coil B2 and a transmitting coil C2, and two adjacent transmitting coils are abutted against each other; the transmitting coil a1 is connected to the phase a of the high-frequency three-phase inverter H, the transmitting coil B1 is connected to the phase B of the high-frequency three-phase inverter H, and the transmitting coil C1 is connected to the phase C of the high-frequency three-phase inverter H.
5. The constant-output-voltage dual-pick-up three-phase dynamic wireless power transmission system according to claim 4, wherein: the resonance unit comprises a resonance inductor LPAResonant inductor LPBResonant inductor LPCResonant capacitor CPAResonant capacitor CPBAnd a resonance capacitor CPC(ii) a The primary compensation capacitor comprises a primary compensation capacitor CTAPrimary compensation capacitor CTBAnd a primary compensation capacitor CTCThe secondary compensation capacitor comprises a secondary compensation capacitor CS1And a secondary compensation capacitor CS2；
The A-phase output end of the high-frequency three-phase inverter H sequentially passes through the resonant inductor LPAAnd a compensation capacitor CTAAnd a transmitting coil A1, i.e. a transmitting coil LTAConnected by a coil LTAThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPAConnected in parallel to a compensation capacitor CTAAnd a transmitting coil LTATwo ends;
b-phase output end of high-frequency three-phase inverter H sequentially passes through resonant inductor LPBAnd a compensation capacitor CTBAnd a transmitting coil B1, i.e. a transmitting coil LTBConnected by a coil LTBThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPBConnected in parallel to a compensation capacitor CTBAnd a transmitting coil LTBTwo ends;
c-phase output end of high-frequency three-phase inverter H sequentially passes through resonant inductor LPCAnd a compensation capacitor CTCAnd a transmitting coil C1, i.e. a transmitting coil LTCConnected by a coil LTCThe other end is connected with the negative electrode of a direct current power supply E, and a resonant capacitor CPCConnected in parallel to a compensation capacitor CTCAnd a transmitting coil LTCTwo ends;
receiving coil S1
Figure FDA0003001224240000021
The same name end of the capacitor is connected with a secondary compensation capacitor
Figure FDA0003001224240000022
Connected with one input end of the rectification filter circuit K, and a receiving coil S2, namely a receiving coil
Figure FDA0003001224240000023
The same name end of the capacitor is connected with a secondary compensation capacitor
Figure FDA0003001224240000024
A receiving coil connected with the other input end of the rectification filter circuit K
Figure FDA0003001224240000025
The other end and the receiving coil
Figure FDA0003001224240000026
The other end is connected, and the output end of the rectification filter circuit K is connected with a load R.
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