CN114552800A - Magnetic resonance wireless power transmission system with receiving end high-order LC compensation - Google Patents

Magnetic resonance wireless power transmission system with receiving end high-order LC compensation Download PDF

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CN114552800A
CN114552800A CN202210193226.2A CN202210193226A CN114552800A CN 114552800 A CN114552800 A CN 114552800A CN 202210193226 A CN202210193226 A CN 202210193226A CN 114552800 A CN114552800 A CN 114552800A
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order
receiving
transmitting
current
capacitor
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李志忠
龙淑群
张亦弛
邱炜
夏振林
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Guangdong University of Technology
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Guangdong University of Technology
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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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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

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  • Computer Networks & Wireless Communication (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides a magnetic resonance wireless power transmission system with a receiving end compensated by high-order LC, and relates to the technical field of wireless power transmission. The device comprises a transmitting end and a receiving end; the transmitting terminal comprises a transmitting terminal compensation network and a transmitting coil, the transmitting terminal compensation network is connected with the transmitting coil, an alternating current signal is input into the transmitting terminal compensation network, the current in the transmitting coil is enabled to present a constant current characteristic through the transmitting terminal compensation network, and the transmitting coil transmits electric energy to the receiving coil through magnetic coupling; the receiving end comprises a receiving coil and a receiving end compensation network, and the receiving end compensation network comprises a high-order LC structure with a plurality of stages of LC; the receiving coil is connected with the receiving end compensation network, the receiving coil receives the electric energy sent by the transmitting coil, and the transmission efficiency is stabilized through the receiving end compensation network. When the load changes, LCC-C (LC)nThe high-order topology family has higher efficiency smoothness compared with the traditional topology.

Description

Magnetic resonance wireless power transmission system with receiving end high-order LC compensation
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to a magnetic resonance wireless power transmission system with a receiving end compensated by high-order LC.
Background
Compared with wired power transmission, the wireless power transmission technology has the advantages of stability, safety, capability of avoiding port aging and abrasion, reduction of electric arc and electric leakage risks, and small influence by severe environments such as moist dust; generally, in a wireless power transmission system, in order to achieve co-frequency resonance of the inductance of a transceiver coil and improve the energy transmission power and efficiency of the system, the transceiver coil needs to be compensated at the same time in a form of adding a compensation network in a transceiver circuit. The compensation network plays a vital role in a magnetic resonance coupling type wireless power transmission system, the parameters of the bilateral compensation network of the transceiver mechanism are configured, and the equivalent impedance characteristic of the system can be changed, so that the reactive power of the system is reduced to the maximum extent, the integral power factor of the system is improved, the coupling degree between the transceiver coils is increased, and the transmission efficiency of the current LCC-S and LCC-CCL combined type resonance compensation network topology structure still has a space for improvement.
In the LCC-S type wireless power transmission system and the parameter design method in the prior art, the system transmission efficiency is relatively low under the condition of light load, the system transmission stability is poor, the system transmission efficiency is rapidly reduced along with the increase of the load, and the system cannot be suitable for a variable load charging mode in the battery charging process when the wireless power transmission is used for charging the battery.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a receiving end high-order LC compensated magnetic resonance wireless power transmission system with higher system transmission efficiency and stability.
The technical scheme of the invention is as follows:
a receiving-end high-order LC compensated magnetic resonance wireless power transmission system comprises: a transmitting end and a receiving end;
the transmitting terminal comprises a transmitting terminal compensation network and a transmitting coil, the transmitting terminal compensation network is connected with the transmitting coil, an alternating current signal is input into the transmitting terminal compensation network, the current in the transmitting coil is enabled to present a constant current characteristic through the transmitting terminal compensation network, and the transmitting coil transmits electric energy to the receiving coil through magnetic coupling;
the receiving end comprises a receiving coil and a receiving end compensation network, and the receiving end compensation network comprises a high-order LC structure with a plurality of stages of LC; the receiving coil is connected with the receiving end compensation network, the receiving coil receives the electric energy sent by the transmitting coil, and the transmission efficiency is stabilized through the receiving end compensation network.
The technical scheme provides a receiving end high-order LC compensated magnetic resonance wireless power transmission system, which comprises a transmitting end and a receiving end, wherein the transmitting end is of an LCC series-parallel resonance structure, and the receiving end is provided with a high-order LC structure; when the load changes in an ideal state, the current of the transmitting coil cannot change, and the constant current of the transmitting coil can keep the stable transmission characteristic of the system; in the receiving terminal, when the number of the LCs in the high-order LC structure is odd, the output of the receiving terminal shows a constant current characteristic, and when the number of the LCs in the high-order LC structure is even, the output of the receiving terminal shows a constant voltage characteristic; therefore, when the load changes, the receiving-end high-order LC compensated magnetic resonance wireless power transmission system has higher efficiency stability compared with the traditional LCC-S and LCC-CCL topologies, and the efficiency at light load is far higher than that of the traditional topologies.
Furthermore, the transmitting end compensation network is an LCC series-parallel resonant network and comprises a capacitor C connected with the transmitting coil in seriesTA capacitor C connected in parallel with the transmitting coilPAnd an inductor L connected in parallel with the transmitter coilPThe transmitting terminal also comprises an inverter circuit, the input end of the inverter circuit is connected with a direct current power supply, the output end of the inverter circuit is connected with the transmitting terminal compensation network, and the inverter circuit converts direct current input into alternating current signals to be output.
Furthermore, the inverter circuit is a full-bridge inverter circuit, and the inverter circuit comprises a MOS (metal oxide semiconductor) tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4(ii) a MOS tube Q1Drain electrode of (1) and MOS transistor Q3Drain electrode of MOS transistor Q2Source electrode of and MOS transistor Q4Source electrode of (3) is connected with MOS tube Q1Source electrode of the MOS transistor Q2Drain electrode of (1), MOS tube Q3Source electrode of the MOS transistor Q is connected with a MOS transistor Q4Drain electrode of (1), MOS tube Q3Drain electrode of (1) and MOS tube Q2The source electrode of the inverter circuit is used as the input end of the inverter circuit, and the MOS tube Q1Source electrode of and MOS transistor Q4The drain electrode of the inverter circuit is used as the output end of the inverter circuit; MOS tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4Are all N-type MOS tubes, MOS tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4The gates of all the switches are connected with the PWM signal.
Furthermore, the receiving end also comprises a rectifying circuit, the input end of the rectifying circuit is connected with the output end of the high-order LC structure, and the output end of the rectifying circuit is connected with the load.
Further, the rectifying circuit is a full-bridge rectifying circuit, and the rectifying circuit comprises a diode DR1Diode DR2Diode DR3And a diode DR4(ii) a Diode DR1Negative electrode of (2) is connected with a diode DR2Negative electrode of (2), diode DR3Anode of (2) connecting diode DR4Anode of (2), diode DR1Anode of (2) connecting diode DR3Negative electrode of (2), diode DR2Anode of (2) connecting diode DR4The negative electrode of (1); diode DR1Anode and diode DR4The negative pole of the diode D is used as the input end of the rectification circuitR3Anode and diode DR2The negative electrode of the rectifier circuit is used as the output end of the rectifier circuit.
Further, the rectifier circuit also comprises a rectifier capacitor CoA rectifier capacitor CoTwo ends of the rectifier circuit are respectively connected with two output ends of the rectifier circuit.
In the above technical scheme, the capacitor C is rectifiedoThe high-frequency wave output by the diode is converted into direct current and is transmitted to load equipment for use.
Further, the rectifying capacitor CoIs a polar capacitor, a rectifying capacitor CoAnode of (2) connecting diode DR2Negative electrode of (1), rectifying capacitor CoNegative electrode of (2) is connected with a diode DR3The positive electrode of (1).
Furthermore, the high-order LC structure in the receiving end compensation network comprises two-to-ten-order LC structures, each-order LC structure comprises a capacitor and an inductor, the capacitor is provided with a first connecting end and a second connecting end of the capacitor, the inductor is provided with a first connecting end and a second connecting end of the inductor, and the second connecting end of the capacitor of each-order LC structure is connected with the first connecting end of the inductor; the connection relationship between two adjacent LC structures is as follows: the second connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC inductor, and the first connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC capacitor; the first capacitor connecting end and the second capacitor connecting end of the first-order LC structure in the high-order LC structure are used as input ends of the high-order LC structure, and the first capacitor connecting end and the second inductor connecting end of the last-order LC structure in the high-order LC structure are used as output ends of the high-order LC structure.
Further, the sum of the reactance of each mesh in the system is zero, and the system works in a resonance state; according to the KVL equation, the receiving end loop has the following relationship in the resonance state:
Figure BDA0003525082010000031
wherein, UINFor the transmitting end input voltage, ITFor transmitting coil current, ZCPCompensating the capacitance C in the network for the transmitting endPCapacitive reactance of (I)INFor the input of current at the transmitter terminal, IRFor receiving coil current, RLFor the load at the receiving end, IOFor the output current of the receiving terminal, In-1Is a current of an n-1 th order LC structure, ZMIs a mutual inductance impedance, CnA capacitance of an nth order LC structure, LnInductance being an nth order LC structure, ZCnIs CnCapacitive reactance of, ZLnIs Lnω is the resonant angular frequency of the circuit;
input current I of transmitting terminalINThe expression is as follows:
Figure BDA0003525082010000041
transmitting coil current ITThe expression is as follows:
Figure BDA0003525082010000042
from the transmitting coil current ITAccording to the expression, the current I of the transmitting coilTCompensating the capacitance C in the network only with the input voltage and the transmitting endPRelated, independent of load; the constant current of the transmitting coil enables the system to maintain stable transmission characteristics;
receiving coil current IRThe expression is as follows:
Figure BDA0003525082010000043
output current I of receiving terminalOThe expression is as follows:
Figure BDA0003525082010000044
from an output current IOThe expression (b) shows that when the order n of the high-order LC structure is an odd number, the topological output current of the circuit topological family is independent of the load and shows constant current characteristics; when the order n of the high-order LC structure is an even number, the output voltage of the receiving end of the circuit topology family is independent of the load and shows constant voltage characteristics.
Furthermore, the high-order LC structure in the receiving end compensation network is a second-order LC structure, and the transmitting end also comprises an inductor L connected with the input power supply in seriesPThe transmitting end and the receiving end have five meshes in total, and a KVL equation is written for five voltage mesh columns:
Figure BDA0003525082010000051
Figure BDA0003525082010000052
UIN＝R1IIN-ZCPCIO＝R1DIO-ZCPCIO＝(R1D-ZCPC)IO＝EIO
Figure BDA0003525082010000053
solving to obtain an efficiency expression of the magnetic resonance wireless power transmission system with a high-order LC structure in the receiving end compensation network as a second-order LC structure as follows:
Figure BDA0003525082010000054
wherein, ZMIs a mutual inductance impedance, UINFor the transmitting end input voltage, ITTo transmit coil current, ZCPCompensating a capacitance C in a network for a transmitting endPCapacitive reactance of, ZLPIs an inductance LPInductive reactance of (I)INFor the input of current at the transmitter, IRTo receive the coil current, ZCnCapacitive reactance, Z, being an nth order LC structureLnIs LnInductive reactance of (1), RLFor the load at the receiving end, IOFor the output current of the receiving terminal, In-1Is a current of an n-1 th order LC structure, R1、R2、R3、R4And R5All are line equivalent resistances.
The invention provides a magnetic resonance wireless power transmission system with a receiving end compensated by high-order LC (inductance capacitance), which comprises a transmitting end and a receiving end, wherein the transmitting end is of an LCC (inductance capacitance) series-parallel resonance structure, and the receiving end is provided with a high-order LC structure; compared with the prior art, the invention has the beneficial effects that: the current of the transmitting coil is only related to the input voltage and parameters in the transmitting terminal compensation network, but not related to the load, when the load changes in an ideal state, the current of the transmitting coil does not change, and the constant current of the transmitting coil can keep the stable transmission characteristic of the system; in the receiving terminal, when the number of the LCs in the high-order LC structure is odd, the output of the receiving terminal shows a constant current characteristic, and when the number of the LCs in the high-order LC structure is even, the output of the receiving terminal shows a constant voltage characteristic; therefore, when the load changes, the receiving-end high-order LC compensated magnetic resonance wireless power transmission system has higher efficiency stability compared with the traditional LCC-S and LCC-CCL topologies, and the efficiency at light load is far higher than that of the traditional topologies.
Drawings
FIG. 1 is a schematic diagram of a magnetic resonance wireless power transmission system with high-order LC compensation at a receiving end;
FIG. 2 is a schematic diagram of a topology of a conventional LCC-S and LCC-CCL hybrid resonant compensation network;
FIG. 3 is a schematic diagram of a circuit topology family of a receiving-end high-order LC compensated magnetic resonance wireless power transmission system;
FIG. 4 is a schematic diagram of an equivalent circuit model of a magnetic resonance wireless power transmission system with receiving end high-order LC compensation;
FIG. 5 is a schematic diagram of an equivalent circuit model of a magnetic resonance wireless power transmission system with a second-order LC structure;
FIG. 6 is a simulation graph of the transmission efficiency of the present invention and a conventional LCC-S structure as a function of load;
fig. 7 is an experimental graph of transmission efficiency with load variation for the present invention and the conventional LCC-S structure.
Detailed Description
For clearly illustrating the receiving-end high-order LC compensated magnetic resonance wireless power transmission system of the present invention, the present invention will be further described with reference to the embodiments and the accompanying drawings, but the protection scope of the present invention should not be limited thereby.
Example 1
A receiving-end high-order LC compensated magnetic resonance wireless power transmission system, as shown in fig. 1, comprising: a transmitting end and a receiving end;
the transmitting terminal comprises a transmitting terminal compensation network and a transmitting coil LTThe transmitting terminal compensation network is connected with a transmitting coil LTInput of AC signalA transmitting terminal compensation network for converting the input electric energy into high-frequency voltage and current signals, which are input into the transmitting coil LTTransmitting coil LTSending out electric energy, enabling the current in the transmitting coil to present a constant current characteristic through a transmitting end compensation network, and transmitting the electric energy to the receiving coil through magnetic coupling by the transmitting coil; (ii) a
The receiving end comprises a receiving coil LRAnd a receiving end compensation network comprising a high-order LC structure with several LC orders; receiving coil LRConnected to a receiver compensation network, a receiver coil LRReceiving and transmitting coil LTThe generated electric energy is compensated by the receiving end to stabilize the transmission efficiency of the network.
The embodiment provides a receiving end high-order LC compensated magnetic resonance wireless power transmission system, which comprises a transmitting end and a receiving end, wherein the transmitting end is of an LCC series-parallel resonance structure, and the receiving end is provided with a high-order LC structure; when the load changes in an ideal state, the current of the transmitting coil cannot change, and the constant current of the transmitting coil can keep the stable transmission characteristic of the system; in the receiving terminal, when the number of the LCs in the high-order LC structure is odd, the output of the receiving terminal shows a constant current characteristic, and when the number of the LCs in the high-order LC structure is even, the output of the receiving terminal shows a constant voltage characteristic; therefore, when the load changes, the receiving-end high-order LC compensated magnetic resonance wireless power transmission system has higher efficiency stability compared with the traditional LCC-S and LCC-CCL topologies, and the efficiency at light load is far higher than that of the traditional topologies.
Example 2
On the basis of embodiment 1, as shown in fig. 1, the transmitting end compensation network of this embodiment is an LCC series-parallel resonant network, the transmitting end further includes an inverter circuit, an input end of the inverter circuit is connected to a dc power supply, an output end of the inverter circuit is connected to the transmitting end compensation network, and the inverter circuit converts a dc input into an ac signal for output. The inverter circuit is a full-bridge inverter circuit and comprises an MOS (metal oxide semiconductor) tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4(ii) a MOS tube Q1Drain electrode of (1) and MOS transistor Q3Drain electrode of MOS transistor Q2Source electrode of and MOS transistor Q4Source electrode of MOS transistor Q1Source electrode of the MOS transistor Q2Drain electrode of (1), MOS tube Q3Source electrode of the MOS transistor Q4Drain electrode of (1), MOS tube Q3Drain electrode of (1) and MOS transistor Q2The source electrode of the inverter circuit is used as the input end of the inverter circuit, and the MOS tube Q1Source electrode of and MOS transistor Q4The drain of the inverter circuit is used as the output end of the inverter circuit. MOS tube Q1MOS transistor Q2MOS transistor Q3And MOS tube Q4Are all N-type MOS tubes, MOS tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4The gates of all the switches are connected with the PWM signal. MOS tube Q1MOS transistor Q2MOS transistor Q3And MOS tube Q4All the models are FQPF12N 60.
The receiving end of the embodiment further comprises a rectifying circuit, wherein an input end of the rectifying circuit is connected with an output end of the high-order LC structure, and an output end of the rectifying circuit is connected with a load. The rectification circuit is a full-bridge rectification circuit and comprises a diode DR1Diode DR2Diode DR3And a diode DR4(ii) a Diode DR1Negative electrode of (2) is connected with a diode DR2Negative electrode of (2), diode DR3Anode of (2) connecting diode DR4Anode of (2), diode DR1Anode of (2) connecting diode DR3Negative electrode of (2), diode DR2Anode of (2) connecting diode DR4The negative electrode of (1); diode DR1Anode and diode DR4The negative pole of the diode D is used as the input end of the rectification circuitR3Anode and diode DR2The negative electrode of the rectifier circuit is used as the output end of the rectifier circuit. The rectification circuit also comprises a rectification capacitor CoA rectifier capacitor CoTwo ends of the rectifier circuit are respectively connected with two output ends of the rectifier circuit. The rectifier capacitor CoIs a polar capacitor, a rectifier capacitor CoAnode of (2) connecting diode DR2Negative electrode of (1), rectifying capacitor CoNegative electrode of (2) is connected with a diode DR3The positive electrode of (1).
In this embodiment, the high-order LC structure in the receiving end compensation network includes two to ten-order LC structures, each of the two-order LC structures includes a capacitor and an inductor, the capacitor has a first connection end and a second connection end of the capacitor, the inductor has a first connection end and a second connection end of the inductor, and the second connection end of the capacitor of each of the two-order LC structures is connected with the first connection end of the inductor; the connection relationship between two adjacent LC structures is as follows: the second connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC inductor, and the first connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC capacitor; the first capacitor connecting end and the second capacitor connecting end of the first-order LC structure in the high-order LC structure are used as input ends of the high-order LC structure, and the first capacitor connecting end and the second inductor connecting end of the last-order LC structure in the high-order LC structure are used as output ends of the high-order LC structure.
Example 3
In order to realize the inductive co-frequency resonance of a receiving coil and a transmitting coil and improve the energy transmission power and efficiency of the system in the wireless electric energy transmission system, the receiving and transmitting coils need to be compensated at the same time in a mode of adding a compensation network in a receiving and transmitting mechanism. The compensation network plays a vital role in a magnetic resonance coupling type wireless charging system, and the parameters of the bilateral compensation network of the transceiver mechanism are configured, so that the equivalent impedance characteristic of the system can be changed, the reactive power of the system is reduced to the maximum extent, the integral power factor of the system is improved, and the coupling degree between the transceiver coils is increased. The compensation network has four basic topological structures S-S, S-P, P-P, P-S according to different serial-parallel combination modes of the bilateral compensation network of the transceiver mechanism. Because the basic topological structure has certain limitation, a composite resonant topological structure is introduced on the basic topological structure, and the composite resonant topological structure mainly comprises the following components: LCL-S type, LCC-S type, LCL-LCL type, LCC-LCC type and the like.
The traditional compensation network is similar to the LCC-S type and LCC-CCL type composite resonant topological structures, the schematic diagram of the LCC-S and LCC-CCL composite resonant compensation network topological structures is shown in figure 2, and the LCC-S and LCC-CCL composite resonant compensation network has the following defects:
1. under the condition of light load, the transmission efficiency of the system is relatively low.
2. The system transmission efficiency stability is poor. As the load increases, the system transmission efficiency drops rapidly and cannot be applied to a variable load charging mode during battery charging.
In this embodiment, a set of circuit topology families of a receiving-end high-order LC compensated magnetic resonance wireless power transmission system is provided, and a circuit structure of the circuit topology family is shown in fig. 3, where the circuit topology family includes a transmitting-end compensation network and a transmitting coil of a transmitting end, a receiving coil of a receiving end, and a receiving-end compensation network, where the transmitting-end compensation network is an LCC series-parallel resonance network, and the receiving-end compensation network is c (LC)nThe resonant network selects different n values to correspond to different topological structures; therefore, the circuit topology family of the receiving-end high-order LC compensated magnetic resonance wireless power transmission system of the embodiment can be called LCC-C (LC)nA high-order topological family.
The receiving end compensation network comprises a high-order LC structure with a plurality of stages of LC and a receiving end compensation capacitor CRReceiving end compensation capacitor CRConnecting the input end of the high-order LC structure;
the high-order LC structure comprises n-order LC structures, each order LC structure comprises a capacitor and an inductor, the capacitor is provided with a first connecting end and a second connecting end of the capacitor, the inductor is provided with a first connecting end and a second connecting end of the inductor, and the second connecting end of the capacitor of each order LC structure is connected with the first connecting end of the inductor; the connection relationship between two adjacent LC structures is as follows: the second connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC inductor, and the first connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC capacitor; the first capacitor connecting end and the second capacitor connecting end of the first-order LC structure in the high-order LC structure are used as input ends of the high-order LC structure, and the first capacitor connecting end and the second inductor connecting end of the last-order LC structure in the high-order LC structure are used as output ends of the high-order LC structure. Receiving end compensation capacitor CRAnd connecting the second connection end of the capacitor.
In the whole magnetic resonance wireless power transmission system, the resonance network plays a role in starting and stopping in the power transmission processThe LCC series-parallel resonant network at the transmitting end mainly has the function of converting electric energy input by a power supply into required high-frequency voltage and current signals through the LCC series-parallel resonant network, loading the high-frequency voltage and current signals into a transmitting coil and further transmitting the electric energy efficiently. The inductance and capacitance parameters of the LCC series-parallel resonant network are reasonably designed, so that the reliability and the adaptability of the LCC series-parallel resonant network are improved. On the other hand, for the receiving end, the inductance value and the size of the receiving coil are reasonably designed, and C (LC) of the receiving end is reasonably selectednThe resonant network parameters can improve the stability of the transmission efficiency of the system, and ensure the stability of the transmission efficiency when the load changes.
The input ac signal in fig. 3 is sent out through an inverter circuit, as shown in fig. 1, an input end of the inverter circuit is connected to a dc power supply, an output end of the inverter circuit is connected to a transmitting end compensation network, and the inverter circuit converts the dc input into an ac signal for output; the inverter circuit is a full-bridge inverter circuit and comprises an MOS (metal oxide semiconductor) tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4(ii) a MOS tube Q1Drain electrode of (1) and MOS transistor Q3Drain electrode of MOS transistor Q2Source electrode of and MOS transistor Q4Source electrode of MOS transistor Q1Source electrode of the MOS transistor Q2Drain electrode of (1), MOS tube Q3Source electrode of the MOS transistor Q4Drain electrode of (2), MOS tube Q3Drain electrode of (1) and MOS transistor Q2The source electrode of the inverter circuit is used as the input end of the inverter circuit, and the MOS tube Q1Source electrode of and MOS transistor Q4The drain of the inverter circuit is used as the output end of the inverter circuit.
By analyzing the circuit characteristics of the transmitting end and receiving end resonant networks in the group of receiving end high-order LC compensated magnetic resonance wireless power transmission system circuit topology families of the present embodiment, the circuit of fig. 3 can be equivalent to obtain the receiving end high-order LC compensated magnetic resonance wireless power transmission system equivalent circuit model shown in fig. 4.
ZMFor mutual inductance between the receiver coil and the transmitter coil, where ω is the resonant angular frequency of the circuit, ZMAnd other impedances are expressed as follows:
Figure BDA0003525082010000101
according to the KVL equation, the receiving end loop has the following relationship in the resonance state:
Figure BDA0003525082010000102
when the inductance and capacitance parameters of the compensation network are set, the sum of the reactance of each mesh needs to be ensured to be zero, so that the system works in a resonance state.
Figure BDA0003525082010000103
Figure BDA0003525082010000111
Figure BDA0003525082010000112
Figure BDA0003525082010000113
From the transmitting coil current ITThe expression shows that no matter what the value of n of the topological family, all topological transmission coils of the topological family have the same expression, and the expression is only related to the input voltage and the parameters in the compensation network and is not related to the load. This means that the topology of the topology family has the same property that the current of the transmission coil does not change when the load changes in the ideal state. The constant current of the topological family transmitting coil can keep the stable transmission characteristic of the system.
Output current I from the receiving endOThe expression of (c) can be known. When n is an odd number, the expression of the output current is related to the mutual inductance, the compensation network parameters and the input voltage, at which time the output current is related to the mutual inductance, the compensation network parameters and the input voltageThe topology output current of the topology family is independent of the load and exhibits constant current characteristics. When n is an even number, the output current expression is related to the mutual inductance, the compensation network parameters, the input voltage and the load, and the output current is positively related to the input voltage and negatively related to the load. This means that when n is an even number, the topology output voltage of the topology family is load independent and exhibits constant voltage characteristics.
Consider this example set of LCC-C (LC)nComplexity of the higher-order topology family, here, only the conventional LCC-S topology with n ═ 0 and the LCC-c (LC) of the magnetic resonance radio transmission system with the second-order LC structure with n ═ 2 are used2The circuit topology carries out theoretical comparative analysis on the transmission efficiency of the system, LCC-C (LC)2The equivalent model of the circuit topology is shown in a schematic diagram of an equivalent circuit model of a magnetic resonance wireless power transmission system with a second-order LC structure in FIG. 5;
write KVL equation for five voltage mesh columns:
Figure BDA0003525082010000121
Figure BDA0003525082010000122
UIN＝R1IIN-ZCPCIO＝R1DIO-ZCPCIO＝(R1D-ZCPC)IO＝EIO
Figure BDA0003525082010000123
obtaining LCC-C (LC)2The efficiency expression for the circuit topology is:
Figure BDA0003525082010000124
similarly, the method solves the LCC-S conventional topology with n being 0, and can obtain:
Figure BDA0003525082010000125
by analyzing the relationship between the MATLAB simulation efficiency and the load curve as shown in FIG. 6, the following results can be obtained: (1) when the load changes, LCC-C (LC)2The transmission efficiency of the circuit topology has higher smoothness compared with the traditional topology LCC-S. (2) LCC-C (LC)2The efficiency of the circuit topology under light load is far higher than that of the LCC-S.
It can be seen from fig. 7 that the transmission efficiency of the magnetic resonance wireless power transmission system having the second-order LC structure at the receiving end and the transmission efficiency of the conventional LCC-S structure vary with load according to the experimental graph of the present invention and the conventional LCC-S structure, when the load varies, the LCC-c (LC)nThe high-order topology family has higher efficiency smoothness compared with the traditional topology. LCC-C (LC)nThe efficiency of the high-order topology family at light load is much higher than the traditional topology.
Example 4
On the basis of embodiment 3, the transmitting end of this embodiment further includes an inverter circuit, and the receiving end further includes a rectifier circuit, as shown in fig. 1, an input end of the inverter circuit is connected to a dc power supply, an output end is connected to the transmitting end compensation network, and the inverter circuit converts a dc input into an ac signal for output; the rectifying circuit comprises a power diode DR1Diode DR2Diode DR3Diode DR4Filter capacitor COLoad RLoad. The input end of the rectification circuit is connected with the output end of the high-order LC structure, and the output end of the rectification circuit is connected with the load. The rectifier circuit is used for leading the high-frequency alternating-current sine wave received by the high-order LC structure resonant network of the receiving end to pass through the diode D of the receiving endR1Diode DR2Diode DR3Diode DR4Converted into high-frequency steamed bread waves, and then passed through filter capacitor COThe high-frequency steamed bread wave is converted into direct current and is transmitted to load equipment for use.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A receiving end high-order LC compensated magnetic resonance wireless power transmission system is characterized by comprising: a transmitting end and a receiving end;
the transmitting terminal comprises a transmitting terminal compensation network and a transmitting coil, the transmitting terminal compensation network is connected with the transmitting coil, an alternating current signal is input into the transmitting terminal compensation network, the current in the transmitting coil is enabled to present a constant current characteristic through the transmitting terminal compensation network, and the transmitting coil transmits electric energy to the receiving coil through magnetic coupling;
the receiving end comprises a receiving coil and a receiving end compensation network, and the receiving end compensation network comprises a high-order LC structure with a plurality of stages of LC; the receiving coil is connected with the receiving end compensation network, the receiving coil receives the electric energy sent by the transmitting coil, and the transmission efficiency is stabilized through the receiving end compensation network.
2. The receiving-end high-order LC compensated magnetic resonance wireless power transmission system of claim 1, wherein the transmitting-end compensation network is an LCC series-parallel resonant network, and the transmitting-end compensation network comprises a capacitor C connected in series with the transmitting coilTA capacitor C connected in parallel with the transmitting coilPAnd an inductor L connected in parallel with the transmitter coilPThe transmitting terminal also comprises an inverter circuit, the input end of the inverter circuit is connected with a direct-current power supply, the output end of the inverter circuit is connected with the transmitting terminal compensation network, and the inverter circuit converts direct-current input into alternating-current signals for output.
3. The receiving-end high-order LC compensated magnetic resonance wireless power transfer system of claim 2,the inverter circuit is a full-bridge inverter circuit and comprises an MOS (metal oxide semiconductor) tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4(ii) a MOS tube Q1Drain electrode of (1) and MOS transistor Q3Drain electrode of MOS transistor Q2Source electrode of and MOS transistor Q4Source electrode of MOS transistor Q1Source electrode of the MOS transistor Q is connected with a MOS transistor Q2Drain electrode of (1), MOS tube Q3Source electrode of the MOS transistor Q4Drain electrode of (1), MOS tube Q3Drain electrode of (1) and MOS transistor Q2The source electrode of the inverter circuit is used as the input end of the inverter circuit, and the MOS tube Q1Source electrode of and MOS transistor Q4The drain electrode of the inverter circuit is used as the output end of the inverter circuit; MOS tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4Are all N-type MOS tubes, MOS tube Q1MOS transistor Q2MOS transistor Q3And MOS transistor Q4The gates of all the switches are connected with the PWM signal.
4. The receiving end high-order LC compensated magnetic resonance wireless power transmission system as claimed in claim 1, wherein the receiving end further comprises a rectifying circuit, the input end of the rectifying circuit is connected with the output end of the high-order LC structure, and the output end of the rectifying circuit is connected with the load.
5. The receiving-end high-order LC compensated magnetic resonance wireless power transmission system of claim 4, wherein the rectification circuit is a full-bridge rectification circuit, and the rectification circuit comprises a diode DR1Diode DR2Diode DR3And a diode DR4(ii) a Diode DR1Negative electrode of (2) is connected with a diode DR2Negative electrode of (2), diode DR3Anode of (2) connecting diode DR4Anode of (2), diode DR1Anode of (2) connecting diode DR3Negative electrode of (2), diode DR2Anode of (2) connecting diode DR4The negative electrode of (1); diode DR1Anode and diode DR4The negative pole of the diode D is used as the input end of the rectification circuitR3Anode and diode DR2The negative electrode of the rectifier circuit is used as the output end of the rectifier circuit.
6. The receiving-end high-order LC compensated magnetic resonance wireless power transmission system of claim 5, wherein the rectifying circuit further comprises a rectifying capacitor CoA rectifier capacitor CoTwo ends of the rectifier circuit are respectively connected with two output ends of the rectifier circuit.
7. The receiving-end high-order LC compensated magnetic resonance wireless power transmission system of claim 6, wherein the rectifying capacitor CoIs a polar capacitor, a rectifier capacitor CoAnode of (2) connecting diode DR2Negative electrode of (1), rectifying capacitor CoNegative electrode of (2) is connected with a diode DR3The positive electrode of (1).
8. The receiving-end high-order LC compensated magnetic resonance wireless power transmission system according to any one of claims 1 to 7, wherein the high-order LC structures in the receiving-end compensation network include two to ten-order LC structures, each-order LC structure includes a capacitor and an inductor, the capacitor has a first connection end and a second connection end of the capacitor, the inductor has a first connection end and a second connection end of the inductor, and the second connection end of the capacitor of each-order LC structure is connected with the first connection end of the inductor; the connection relationship between two adjacent LC structures is as follows: the second connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC inductor, and the first connection end of the capacitor in the second-order LC is connected with the first connection end of the first-order LC capacitor; the first capacitor connecting end and the second capacitor connecting end of the first-order LC structure in the high-order LC structure are used as input ends of the high-order LC structure, and the first capacitor connecting end and the second inductor connecting end of the last-order LC structure in the high-order LC structure are used as output ends of the high-order LC structure.
9. The receiving-end high-order LC-compensated magnetic resonance wireless power transmission system of claim 8, wherein the sum of the reactance of each mesh in the system is zero, and the system operates in a resonance state; according to the KVL equation, the receiving end loop has the following relationship in the resonance state:
Figure FDA0003525082000000031
wherein, UINFor the transmitting end input voltage, ITFor transmitting coil current, ZCPCompensating a capacitance C in a network for a transmitting endPCapacitive reactance of, IINFor the input of current at the transmitter terminal, IRFor receiving coil current, RLFor the load at the receiving end, IOFor the output current of the receiving terminal, In-1Current of n-1 order LC structure, ZMIs a mutual inductance impedance, CnA capacitance of an nth order LC structure, LnInductance being an nth order LC structure, ZCnIs CnCapacitive reactance of (d);
input current I of transmitting terminalINThe expression is as follows:
Figure FDA0003525082000000032
transmitting coil current ITThe expression is as follows:
Figure FDA0003525082000000033
from the transmitting coil current ITAccording to the expression, the current I of the transmitting coilTCompensating the capacitance C in the network only with the input voltage and the transmitting endPRelated, independent of load; the constant current of the transmitting coil enables the system to maintain stable transmission characteristics;
receiving coil current IRThe expression is as follows:
Figure FDA0003525082000000041
output current I of receiving terminalOThe expression is as follows:
Figure FDA0003525082000000042
from an output current IOThe expression (b) shows that when the order n of the high-order LC structure is an odd number, the topological output current of the circuit topological family is independent of the load and shows constant current characteristics; when the order n of the high-order LC structure is an even number, the output voltage of the receiving end of the circuit topology family is independent of the load and shows constant voltage characteristics.
10. The receiving-end high-order LC compensated magnetic resonance wireless power transmission system of claim 9, wherein the high-order LC structure in the receiving-end compensation network is a second-order LC structure, and the transmitting-end further comprises an inductor L connected in series with the input power supplyPThe transmitting end and the receiving end have five meshes in total, and a KVL equation is written for five voltage mesh columns:
Figure FDA0003525082000000043
Figure FDA0003525082000000051
UIN＝R1IIN-ZCPCIO＝R1DIO-ZCPCIO＝(R1D-ZCPC)IO＝EIO
Figure FDA0003525082000000052
solving to obtain an efficiency expression of the magnetic resonance wireless power transmission system with a high-order LC structure in the receiving end compensation network as a second-order LC structure as follows:
Figure FDA0003525082000000053
wherein Z isMIs a mutual inductance impedance, UINFor the transmitting end input voltage, ITFor transmitting coil current, ZCPCompensating a capacitance C in a network for a transmitting endPCapacitive reactance of, ZLPIs an inductance LPInductive reactance of (I)INFor the input of current at the transmitter terminal, IRFor receiving coil current, ZCnCapacitive reactance, Z, of nth order LC structureLnIs LnInductive reactance of (1), RLFor the load at the receiving end, IOIs the output current of the receiving terminal, In-1Is a current of an n-1 th order LC structure, R1、R2、R3、R4And R5All are line equivalent resistances.
CN202210193226.2A 2022-02-28 2022-02-28 Magnetic resonance wireless power transmission system with receiving end high-order LC compensation Pending CN114552800A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117977831A (en) * 2024-03-27 2024-05-03 广东工业大学 Constant power control method of wireless power transmission system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117977831A (en) * 2024-03-27 2024-05-03 广东工业大学 Constant power control method of wireless power transmission system

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