CN119906164A - Asymmetric coupling variable coil type bidirectional wireless power transmission system, method and device - Google Patents
Asymmetric coupling variable coil type bidirectional wireless power transmission system, method and device Download PDFInfo
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- CN119906164A CN119906164A CN202510410009.8A CN202510410009A CN119906164A CN 119906164 A CN119906164 A CN 119906164A CN 202510410009 A CN202510410009 A CN 202510410009A CN 119906164 A CN119906164 A CN 119906164A
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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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- 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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/01—Resonant DC/DC converters
-
- 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
- H02M3/33569—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 several active switching elements
- H02M3/33571—Half-bridge at primary side of an isolation transformer
-
- 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
- H02M3/33569—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 several active switching elements
- H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Inverter Devices (AREA)
Abstract
本发明涉及无线电能传输技术领域，尤其涉及一种非对称耦合可变线圈式双向无线电能传输系统、方法和设备，系统包括电网侧单元和负载侧单元，其中电网侧单元包括原边直流电源、原边逆变器、可变原边补偿网络、原边线圈组件，由第一线圈和第二线圈串联构成；原边控制器；负载侧单元包括副边直流电源、副边开关网络、可变副边补偿网络，连接副边开关网络；副边线圈；副边控制器，调节副边开关网络的导通状态；根据原边线圈组件与副边线圈的非对称耦合结构，进行电能的无线双向恒流或无线双向恒压传输。通过本发明，有效解决了现有双向无线电能传输系统因依赖复杂控制环节及对称结构导致的双向控制能力不足、结构僵化及硬件冗余的问题。
The present invention relates to the field of wireless power transmission technology, and in particular to an asymmetric coupling variable coil type bidirectional wireless power transmission system, method and device, the system includes a grid side unit and a load side unit, wherein the grid side unit includes a primary DC power supply, a primary inverter, a variable primary compensation network, a primary coil assembly, and is composed of a first coil and a second coil connected in series; a primary controller; the load side unit includes a secondary DC power supply, a secondary switch network, a variable secondary compensation network, connected to the secondary switch network; a secondary coil; a secondary controller, adjusting the conduction state of the secondary switch network; and wireless bidirectional constant current or wireless bidirectional constant voltage transmission of electric energy is performed according to the asymmetric coupling structure of the primary coil assembly and the secondary coil. Through the present invention, the problems of insufficient bidirectional control capability, rigid structure and hardware redundancy caused by the existing bidirectional wireless power transmission system due to reliance on complex control links and symmetrical structures are effectively solved.
Description
Technical Field
The invention relates to the technical field of wireless power transmission, in particular to an asymmetric coupling variable coil type bidirectional wireless power transmission system, method and equipment.
Background
The bidirectional wireless power transmission technology realizes bidirectional wireless flow of power through magnetic coupling, is a core technology for realizing dynamic energy management in the fields of electric automobiles, smart grids and the like, and is required to meet the switching requirements of Constant Current (CC) charging and Constant Voltage (CV) floating charging of a storage battery during forward transmission (power supply to a load) and support constant current discharging and constant voltage stabilizing functions during reverse transmission (power supply to the power grid by the load).
However, the traditional variable frequency control relies on frequency adjustment to realize output mode switching, but frequency offset is easy to cause system detuning, efficiency suddenly drops and dynamic response is slow, DC-DC auxiliary control adjusts output through an additional power converter, although the accuracy is higher, additional devices increase system volume, loss and cost, phase shift modulation can adjust output through phase difference, but complex algorithm support is needed, and switching loss is obviously increased along with phase offset. In addition, most schemes in the prior art only optimize unidirectional transmission (such as forward charging), have weak constant-current and constant-voltage control capability during reverse transmission, so that bidirectional performance is asymmetric, the system design strictly depends on the symmetry of primary and secondary coils and a compensation network, and is difficult to adapt to asymmetric scenes such as size difference of a vehicle and power grid equipment, a plurality of groups of primary controllers or switching devices are required to be configured for realizing mode switching, and hardware complexity is high and reliability is reduced.
The information disclosed in this background section is only for enhancement of understanding of the general background of the disclosure and is not to be taken as an admission or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art.
Disclosure of Invention
The invention provides an asymmetric coupling variable coil type bidirectional wireless power transmission system, method and equipment, which can effectively solve the problems in the background technology.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
An asymmetrically coupled variable coil bi-directional wireless power transfer system, the system comprising a grid-side unit and a load-side unit, wherein:
The power grid side unit comprises a primary side direct current power supply U dc1, a primary side inverter, a variable primary side compensation network, a primary side coil assembly, a primary side controller and a power grid side control unit, wherein the primary side inverter comprises a switching tube Q 1、Q2 which is connected with the primary side direct current power supply;
The load side unit comprises a secondary side direct current power supply U dc2, a secondary side switch network, a variable secondary side compensation network, a secondary side coil L s, a secondary side controller and a control circuit, wherein the secondary side switch network comprises a switch tube Q 3、Q4、Q5、Q6 which is connected with the secondary side direct current power supply;
And according to the asymmetric coupling structure of the primary coil assembly and the secondary coil L s, wireless bidirectional constant current or wireless bidirectional constant voltage transmission of electric energy is performed.
Further, in the primary coil assembly, the first coil L p1 is a loop coil, and the second coil L p2 is a double-D coil;
the first coil is arranged around the second coil, and a ferrite isolation layer is arranged between the first coil and the second coil;
The secondary coil L s is a ring coil, is wound on a ferrite substrate, and is spatially and vertically arranged with the first coil L p1.
Further, the variable primary side compensation network includes a series compensation inductance L 1, a parallel compensation capacitance C 1, a first series compensation capacitance C p1, a second series compensation capacitance C p2, and the primary side controller S;
the switching end of the primary side controller S is connected between the output end of the primary side inverter and the series compensation inductance L 1;
The other end of the series compensation inductance L 1 is connected with one end of the parallel compensation capacitor C 1 and one end of the second series compensation capacitor C p2;
the other end of the second series compensation capacitor C p2 is connected with the second coil L p2;
One end of the first series compensation capacitor C p1 is connected to the output end of the primary side inverter through the switching of the primary side controller S, and the other end is connected to the first coil L p1.
Further, the variable secondary compensation network comprises a series compensation inductance L 2, a parallel compensation capacitance C 2, a series compensation capacitance C s and the secondary switch network;
One end of the series compensation inductor L 2 is connected to the negative electrode of the secondary side direct current power supply U dc2 through a switch tube Q 6, and the other end of the series compensation inductor L 2 is connected with one end of the parallel compensation capacitor C 2 and one end of the series compensation capacitor C s;
The other end of the parallel compensation capacitor C 2 is connected with a node between the switching tube Q 4 and the switching tube Q 5;
The other end of the series compensation capacitor C s is connected with one end of the secondary coil L s;
The other end of the secondary coil L s is connected with a node between the switching tube Q 5 and the switching tube Q 6.
Further, the primary side controller and the secondary side controller are further configured to include:
In a constant current output mode, controlling the primary side controller S to disconnect a connection node a of the first coil L p1, connect a node b and constantly conduct switching tubes Q 4 and Q 6 in the secondary side switching network, so that the variable secondary side compensation network forms an LCC topology;
in the constant voltage output mode, the primary side controller S is controlled to be connected with the connection node a and connected with the first coil L p1, the switching tube Q 3 in the secondary side switching network is constantly conducted, the switching tube Q 6 is constantly turned off, and the variable secondary side compensation network forms an S-type topology.
Further, when the bidirectional transmission mode is executed, the method includes:
during forward transmission, the primary side inverter works in a high-frequency inversion state, and the secondary side switch network operates as a half-wave rectifier;
during reverse transmission, the secondary side switch network is switched to a half-bridge inversion state, and the primary side inverter operates as a half-wave rectifier.
Further, the parameters of the variable primary and secondary compensation networks should satisfy the following resonance conditions:
;
;
;
;
;
Wherein ω is the operating angular frequency of the system, L 1 is a series compensation inductance, C 1 is a parallel compensation capacitance, L 2 is a series compensation inductance, C 2 is a parallel compensation capacitance, L s is the secondary coil, C s is a series compensation capacitance, L p1 is the first coil, C p1 is a first series compensation capacitance, L p2 is the second coil, and C p2 is a second series compensation capacitance.
Further, the system provides a constant current independent of a load in a constant current output mode and provides a constant voltage independent of the load in a constant voltage output mode through cooperative switching of the asymmetric coupling structure and the variable compensation network.
A method of asymmetrically coupled variable coil bi-directional wireless power transfer, the method comprising:
collecting double-end electric energy parameters of an output end and an input end in real time, and analyzing and obtaining adjustment requirements;
Controlling physical switching of the contacts of the primary side controller and logical reconstruction of the secondary side switching tube network according to the regulation requirement to generate a multidimensional control frame;
Establishing a bidirectional zero-phase difference resonance condition based on the double-end electric energy parameters of the variable primary side compensation network and the variable secondary side compensation network;
according to the multidimensional control frame and the space orthogonal layout of the first coil and the second coil, constructing a mutual inductance adjusting channel of the primary coil and the secondary coil, and maintaining a bidirectional transmission path when redundant coupling is eliminated;
Based on the synergistic effect of the multidimensional control framework and the bidirectional zero-phase difference resonance condition, constant current or constant voltage output irrelevant to loads is realized in a bidirectional transmission scene through the current source characteristic of the LCC topology and the voltage source characteristic of the S-S topology.
An asymmetric coupling variable coil type bidirectional wireless power transmission device is used for realizing the asymmetric coupling variable coil type bidirectional wireless power transmission system.
By the technical scheme of the invention, the following technical effects can be realized:
The dynamic parameter matching and the frequency closed-loop tracking are utilized to maintain zero phase difference resonance under an asymmetric structure, thereby ensuring high-efficiency transmission in a full-load range and solving the problems of insufficient bidirectional control capability, structural rigidness and hardware redundancy.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic circuit diagram of an asymmetrically coupled variable coil bi-directional wireless power transfer system;
FIG. 2 is a block diagram of a coupling mechanism of an asymmetrically coupled variable coil bi-directional wireless power transfer system;
FIG. 3 is a schematic circuit diagram of a forward and reverse constant current output mode;
fig. 4 is an equivalent circuit diagram in a forward and reverse constant current output mode;
FIG. 5 is a schematic diagram of the circuit in the forward and reverse constant voltage output mode;
FIG. 6 is an equivalent circuit diagram in a forward and reverse constant voltage output mode;
Fig. 7 is a flowchart of the operation of an asymmetrically coupled variable coil bi-directional wireless power transfer system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Embodiment one;
As shown in fig. 1, the present application provides an asymmetrically coupled variable coil type bidirectional wireless power transmission system, which includes a grid side unit and a load side unit, wherein:
The power grid side unit comprises a primary side direct current power supply U dc1, a primary side inverter, a variable primary side compensation network, a primary side coil assembly, a primary side controller and a power grid side control unit, wherein the primary side inverter comprises a switching tube Q 1、Q2 which is connected with the primary side direct current power supply;
the load side unit comprises a secondary side direct current power supply U dc2, a secondary side switch network, a variable secondary side compensation network, a secondary side coil L s, a secondary side controller and a control circuit, wherein the secondary side switch network comprises a switch tube Q 3、Q4、Q5、Q6 which is connected with the secondary side direct current power supply;
And according to the asymmetric coupling structure of the primary coil assembly and the secondary coil L s, wireless bidirectional constant current or wireless bidirectional constant voltage transmission of electric energy is carried out.
Specifically, in a forward constant current output or constant voltage output mode, a relay is controlled by a primary side controller, so that a coupling transformer forms a double-coil structure, and a secondary side controller switches a secondary side compensation network to an LCC compensation topology (constant current mode) or an S-S compensation topology (constant voltage mode); in a reverse constant current output or constant voltage output mode, a primary side controller controls a transformer to be in a double-coil structure or a three-coil structure through a switching relay, a secondary side controller controls a secondary side switching tube network to be in a half-bridge inverter to ensure high-efficiency feedback of electric energy, the relay control is used for switching different coupling structures (double-coil or three-coil) to realize constant current or constant voltage output according to load requirements, the secondary side controller switches a secondary side compensation network according to a working mode to respectively form an LCC or S-S compensation topology to ensure stability of output current or voltage, the relay is controlled to be disconnected or connected with different nodes in the constant current mode, the secondary side controller controls switching tubes Q 4 and Q 6 to be constantly conducted, the secondary side compensation network is switched into an LCC topology (composed of a series compensation inductance L 2, a parallel compensation capacitance C 2 and a series compensation capacitance C s), the relay is controlled to be connected with a first coil L p1 to be required node in the constant current output mode in the constant voltage mode, the secondary side controller enables the switching tube Q 3 to be constantly conducted, and the secondary side compensation network Q 6 to be constantly turned off, and the secondary side compensation network is switched into the constant current output by the S-S topology to be composed of the constant voltage 35L and the output of the series compensation capacitance C35L.
According to the technical scheme, seamless control of bidirectional constant-current constant-voltage output under an asymmetric structure is realized, hardware complexity is reduced according to the functions of multiplexing primary side coils and secondary side switch networks, zero phase difference resonance is maintained under the asymmetric structure by utilizing dynamic parameter matching and frequency closed-loop tracking, high-efficiency energy transmission in a full load range is ensured, and the problems of insufficient bidirectional control capability, structural rigidness and hardware redundancy are solved.
Further, as shown in fig. 2, in the primary coil assembly, the first coil L p1 is a loop coil, and the second coil L p2 is a double D coil;
the first coil surrounds the second coil, and a ferrite isolation layer is arranged between the first coil and the second coil;
the secondary coil L s is a loop coil wound on the ferrite substrate and spatially arranged perpendicular to the first coil L p1.
As a preference of the above embodiment, the first coil is in a ring structure, usually wound by copper wire, in a circular or oval shape, and placed in the core area of the primary side portion, and the ring design enables the first coil to form a uniform magnetic field during transmission, enhancing electromagnetic coupling efficiency, and the specific size, number of turns and wire diameter of the coil are optimized according to the system design requirements, so as to ensure effective coupling with the second coil, while maximizing transmission efficiency; the second coil adopts a double-D-shaped structure, namely, two D-shaped coils are symmetrically arranged to enhance the asymmetry of coupling, the design has the advantages of providing more flexible and efficient electromagnetic coupling, being particularly suitable for a bidirectional electric energy transmission system, the double-D-shaped structure forms special electromagnetic field distribution in space, is suitable for multimode operation and can better support constant current and constant voltage output modes, a ferrite isolation layer is arranged between the first coil and the second coil, ferrite materials have excellent magnetic conductivity and high magnetic permeability, the mutual influence between the coils can be effectively isolated, the interference of magnetic fields is reduced, the coupling efficiency is improved, the thickness and the shape of the isolation layer can be optimized according to design requirements to realize ideal electromagnetic shielding effect and ensure energy efficient transmission, the secondary coil is an annular coil which is similar to the first coil, is wound by copper wires and is designed into an annular shape, the magnetic field focusing capability of the coil is enhanced, the receiving capability of electric energy is improved, the secondary coil and the first coil is vertically arranged in space, the vertical layout can be arranged in the coupling, the necessary interference can be avoided, the magnetic field is generated between the primary coil and the second coil by the primary inverter in the forward power transmission process of the system, the secondary coil receives the magnetic field and converts the magnetic field into electric energy, the electromagnetic coupling can effectively reduce the dispersion of the magnetic field and improve the power transmission efficiency of the system due to the double-D design of the primary coil assembly and the use of a ferrite isolating layer, the secondary coil and the first coil continuously maintain a better magnetic coupling relationship in the reverse transmission process, the secondary coil reversely transmits the power to the primary coil assembly, and at the moment, the vertical arrangement of the secondary coil and the first coil can effectively improve the power conversion efficiency, the primary coil and the second coil are arranged according to the design requirement and ensure that the ferrite isolating layer is arranged between the primary coil and the second coil so as to reduce electromagnetic interference, and the secondary coil is wound on a ferrite substrate and ensure that the secondary coil and the first coil are vertically arranged in space so as to maximize the power coupling efficiency.
Further, the variable primary compensation network includes a series compensation inductance L 1, a parallel compensation capacitance C 1, a first series compensation capacitance C p1, a second series compensation capacitance C p2, and a primary controller S;
The switching end of the primary side controller S is connected between the output end of the primary side inverter and the series compensation inductor L 1;
The other end of the series compensation inductance L 1 is connected with one end of the parallel compensation capacitor C 1 and one end of the second series compensation capacitor C p2;
The other end of the second series compensation capacitor C p2 is connected with a second coil L p2;
One end of the first series compensation capacitor C p1 is connected to the output end of the primary side inverter through switching of the primary side controller S, and the other end is connected to the first coil L p1.
As a preferred embodiment of the above embodiment, in the variable primary side compensation network, the series compensation inductance L 1 is located in the primary side circuit, and is connected in series between the output end of the primary side inverter and other compensation elements, which mainly has the effects of adjusting the phase of the current, reducing the voltage fluctuation and enhancing the stability of the system, and the parallel compensation capacitance C 1 is connected in parallel with the series compensation inductance L 1, so as to play the roles of stabilizing the voltage and reducing the current fluctuation. The capacitor is used for balancing voltage drop caused by inductance to ensure stability of output voltage, the first series compensation capacitor C p1 and the second series compensation capacitor C p2 are connected in series in a network, the effect of C p1 is to stabilize the output voltage of the primary side inverter, C p2 is connected with the primary side coil L p2 to further optimize the working state of the system, the primary side controller S is a control unit which is responsible for adjusting the working state of elements in the primary side compensation network and can switch different capacitors and inductance elements according to load requirements and working modes to optimize the power transmission efficiency of the system, the switching end of the primary side controller S is connected between the output end of the primary side inverter and the series compensation inductance L 1, the current and the voltage of the system are adjusted by controlling the connection mode of the capacitors and the inductance to ensure that the system can realize constant current or constant voltage output in different working modes, the switching end of the primary side controller S is connected between the output end of the primary side inverter and the series compensation inductance L 1 to control the current and voltage change of the series compensation inductance L 1, so that the working state of the whole compensation network is influenced, and the switching end of the primary side controller S is connected to the other end of the series compensation network p2 through the switching end of the capacitor C. The structure is characterized in that the voltage and the current of a system are regulated jointly through the combination of a series compensation inductor L 1, a parallel compensation capacitor C 1 and a second series compensation capacitor C p2, the output stability is ensured, the series compensation inductor L 1 plays a role in current regulation, the parallel compensation capacitor C1 provides support for voltage stability, the second series compensation capacitor C p2 is connected with a second coil L p2, the magnetic coupling of the system is further enhanced, the energy transmission efficiency is optimized, one end of the first series compensation capacitor C p1 is connected with the output end of a primary side inverter through the switching end of the primary side controller S, the other end of the first series compensation capacitor C p1 is connected to the first coil L p1, the connection of the first series compensation capacitor C p1 and the output end of the inverter can be dynamically regulated through the switching controller S, and therefore the working state of a circuit is changed, for example, in a constant current mode, the connection state of the C p1 can enable the system to adapt to load change, the stable output of the current is kept, in a constant voltage mode, the C p1 helps to regulate the output voltage, the realization of the voltage is ensured, in a constant voltage mode, the primary side controller S is connected with the primary side controller S through the switching end of the primary side controller, the switching end of the primary side controller S is connected with the primary side controller S, the output end of the primary side controller is connected with the primary side inverter, the current is not required to be regulated, the stable, the current is regulated, the stable output of the current is ensured, and the stable voltage is ensured, the stable output is ensured, and the output is stable through the stable voltage, and the output of the current is realized through the constant voltage, and the current is stable voltage.
Further, the variable secondary compensation network includes a series compensation inductance L 2, a parallel compensation capacitance C 2, a series compensation capacitance C s, and a secondary switching network;
One end of the series compensation inductance L 2 is connected to the negative electrode of the secondary side direct current power supply U dc2 through a switching tube Q 6, and the other end of the series compensation inductance L 2 is connected with one end of the parallel compensation capacitance C 2 and one end of the series compensation capacitance C s;
the other end of the parallel compensation capacitor C 2 is connected with a node between the switching tube Q 4 and the switching tube Q 5;
the other end of the series compensation capacitor C s is connected with one end of the secondary coil L s;
The other end of the secondary coil L s is connected to a node between the switching tube Q 5 and the switching tube Q 6.
In the variable secondary compensation network, the series compensation inductance L 2 is connected in series with other elements in the secondary circuit to regulate the phase of the current, smooth the current fluctuation, enhance the electromagnetic coupling, one end of the series compensation inductance L 2 is connected to the negative electrode of the secondary dc power supply U dc2 through the switching tube Q 6, the other end of the series compensation inductance C 2 is connected to the end points of the parallel compensation capacitance C 2 and the series compensation capacitance C s, the parallel compensation capacitance C 2 is connected with the series compensation inductance L 2 to provide voltage stability, prevent the voltage fluctuation from being too large, the other end of the parallel compensation capacitance C 2 is connected with the node between the switching tubes Q 4 and Q 5, the configuration of the parallel compensation capacitance C 2 can effectively improve the voltage stability of the secondary portion, ensure that the voltage of the secondary side does not have excessive fluctuation during the transmission, and the series compensation capacitance C s is located in the secondary circuit to work together with the series compensation inductance L 2 and the parallel compensation capacitance C 2 to provide additional voltage regulation capability. one end of the secondary side switch network is connected to the other end of the series compensation inductor L 2, the other end of the secondary side switch network is connected to one end of the secondary side coil L s, the series compensation capacitor C s further stabilizes secondary side current through the series connection with the series compensation inductor L 2 to ensure balance of voltage and current, and the secondary side switch network consists of three switch tubes Q 4、Q5 and Q 6 and is used for switching circuit states and controlling electric energy flow. switching transistors Q 4 and Q 5 control the current flow direction of parallel compensation capacitor C 2, and switching transistor Q 6 is used to control the current path of series compensation inductor L 6; the other end of the parallel compensation capacitor C 6 is connected to a node between the switching tubes Q 6 and Q 6, and provides a control point for electric energy flow; the other end of the secondary coil L 6 is connected to a node between the switching tubes Q 6 and Q 6 to form a closed path for current flow and ensure transmission and feedback of electric energy, one end of the series compensation inductor L 6 is connected to the switching tube Q 6 and is connected to the negative electrode of the secondary DC power supply U 6 through the switching tube Q 6, the other end of the series compensation inductor L 6 is connected with the parallel compensation capacitor C 6 and the series compensation capacitor C 6, the series arrangement of the three provides a current phase adjusting function, so that the secondary coil L 6 can keep good electromagnetic coupling with the primary coil L 6, the other end of the parallel compensation capacitor C 6 is connected to the node between the switching tubes Q 6 and Q 6, the voltage stabilizing function of the parallel compensation capacitor C 6 is determined, the control of the switching tubes Q 6 and Q 6 determines the charging and discharging process of the parallel compensation capacitor C2, and accordingly current and voltage of the secondary side are adjusted, the other end of the series compensation capacitor C 6 is connected with one end of the secondary coil L2, the capacitor C2 can work together with the secondary coil L 6, the current can be adjusted, the current can be converted with the secondary coil L 6, the current can be connected with the secondary coil 6, and the node is connected with the current of the switching tube 6, and the complete circuit Q 6 is formed, ensuring the feedback or transmission of the electric energy from the secondary coil to the switching network, and ensuring the stable output of the secondary current and the series compensation inductance L by the secondary compensation network through adjusting the working states of the parallel compensation capacitor C 2 and the series compensation capacitor C s and controlling the switching state of the switching tube Q 4、Q5、Q6 in the constant current mode 2 The secondary side compensation network adjusts the states of the parallel compensation capacitor C 2 and the series compensation capacitor C s under the constant voltage mode to maintain the stability of the output voltage of the secondary side, the switching tubes Q 4、Q5 and Q 6 are switched timely according to the load requirement to adjust the electric energy output of the secondary side to keep the electric energy output of the secondary side in the constant voltage state, and the accurate adjustment of the secondary side current and the voltage can be realized under different working modes through the switching control of the switching tube Q 4、Q5、Q6 and the cooperation of the series compensation inductor L 2, the parallel compensation capacitor C 2 and the series compensation capacitor C s in the secondary side compensation network, so that the stability and the efficiency of wireless electric energy transmission are ensured.
Further, as shown in fig. 3, 4, 5, and 6, the primary side controller and the secondary side controller are further configured to include:
In a constant current output mode, controlling a primary side controller S to disconnect a connection node a of a first coil L p1, connect a node b and constantly conduct switching tubes Q 4 and Q 6 in a secondary side switching network, so that a variable secondary side compensation network forms an LCC topology;
in the constant voltage output mode, the primary side controller S is controlled to be connected with the connection node a and connected with the first coil L p1, the switching tube Q 3 in the secondary side switching network is constantly conducted, the switching tube Q 6 is constantly turned off, and the variable secondary side compensation network forms an S-type topology.
As a preference of the above embodiment, in the constant current mode, the primary side controller S controls the switching end thereof to disconnect the connection node a of the first coil L p1 and connect to the node b, the coupling mechanism is a dual coil, the switching tube Q 4、Q6 is constantly turned on, the switching tube Q 1、Q2 is alternately turned on with a duty ratio of 50%, the switching tube Q 3、Q5 does not provide a trigger signal, only the diode works, and the output of the first coil L p1 is switched to the node b by the switching control, thereby realizing the constant output of the load current; in the constant current mode, the switching tubes Q 4 and Q 6 of the secondary side controller are constantly conducted, the conduction of Q 4 ensures that the parallel compensation capacitor C 2 keeps stable voltage, the conduction of Q 6 ensures that the working state between the series compensation inductor L 2 and the series compensation capacitor C s is ensured, the configuration forms an LCC topology, in the LCC topology, the secondary side compensation network mainly consists of the series inductor and the parallel capacitor, a stable constant current output can be provided, in the LCC topology, the series compensation inductor L 2 and the parallel compensation capacitor C 2 jointly act to ensure the stability of the secondary side current, meanwhile, the series compensation capacitor C s helps to regulate the output current, in the constant voltage mode, the primary side controller S connects the connection node a to the first coil L p1, ensures that the connection node a is in an on state, the first coil L p1 is connected to the output end of the inverter, the current flows through the first coil to form constant voltage output, the primary side current is regulated, the primary side controller ensures the stability of the output voltage and ensures that the voltage reaches a set value, in the constant voltage mode, the secondary side switching tube Q 3 keeps constant current in the constant voltage mode, the switching tube Q 6 is constantly turned off, the conduction of the Q 3 ensures stable transmission of electric energy in the secondary side circuit, the turn-off of the Q 6 avoids the influence of the series compensation inductance L 2 on output current, and in the S-shaped topology, the capacitor C s and the secondary side coil L s form a feedback network to keep voltage stable. the topology can provide constant voltage output while ensuring efficient energy transfer, and in constant current mode, the primary side controller S disconnects the first coil L p1 from node a and connects it to node b. The secondary side controller forms an LCC topology through the constant conduction switching tubes Q 4 and Q 6, the topology can ensure stable output of secondary side current, meanwhile, the configuration of the series compensation inductor L 2 and the parallel compensation capacitor C 2 can provide effective current compensation, in a constant voltage mode, the primary side controller S connects the connection node a to the first coil L p1 to ensure that the connection node a is connected to the output end of the inverter, the secondary side controller forms an S-shaped topology through the constant conduction switching tube Q 3, the switching tube Q 6 is kept to be turned off, the series compensation capacitor C s in the secondary side compensation network and the secondary side coil L s keep stable voltage in the S-shaped topology, constant voltage is ensured, when in a forward constant voltage mode, the switching arm connection node a of the primary side controller S, the coupling mechanism is three coils, the switching tube Q 6 is constantly turned off, the switching tube Q 3 is constantly turned on, the switching tube Q 1、Q2 is alternately turned on with a duty ratio of 50%, and the switching tube Q 4、Q5 does not provide a trigger signal. When in the reverse constant voltage mode, the switching transistor Q 4、Q5 is alternately turned on at a duty ratio of 50%, and the switching transistor Q 1、Q2 does not provide a trigger signal, only the diode operates.
Further, when the bidirectional transmission mode is executed, the method includes:
During forward transmission, the primary side inverter works in a high-frequency inversion state, and the secondary side switch network works as a half-wave rectifier;
during reverse transmission, the secondary side switch network is switched to a half-bridge inversion state, and the primary side inverter operates as a half-wave rectifier.
As a preference of the above embodiment, in the forward transmission mode, electric energy is transmitted from the primary side to the secondary side, in which mode the primary side inverter operates in a high frequency inversion state and the secondary side switching network operates as a half-wave rectifier, so that electric energy can be effectively transmitted from the primary side to the secondary side through electromagnetic coupling; in the forward transmission process, the primary side inverter converts an input direct current power supply into high-frequency alternating current, so that the primary side inverter converts the received high-frequency alternating current into high-frequency alternating current through electromagnetic coupling transmission through a first coil L p1 and a second coil L p2, the primary side inverter converts the electric energy into alternating current through adjusting the switching frequency and the working mode of a switching tube, the high-frequency alternating current is ensured to be transmitted to a secondary side, a secondary side switching network works as a half-wave rectifier at the moment, the working mode of the secondary side switching tube only allows current to flow in one direction, the switching tubes Q 4 and Q 6 in the secondary side switching network are usually conducted only in one half period to work in a matching way, the received high-frequency alternating current signal is converted into the direct current through half-wave rectification processing, the direct current is supplied to a secondary side load, the primary side inverter converts the direct current into the high-frequency alternating current through the switching network in the forward transmission mode, the secondary side switching network is used as the rectifier and converts the alternating current into the direct current, the direct current to the secondary side load, the fluctuation of the current and the voltage is effectively reduced, stability and efficiency of electric energy transmission are improved, in the reverse transmission mode, the direction is opposite, namely, the secondary side transmission direction is opposite, namely, the primary side is switched from the primary side to the half-side switching network to the inverter half-side inverter bridge to the inverter bridge to work state, the inverter bridge work state, and the bridge work state is switched in the reverse transmission mode, namely, the secondary side switching tubes Q 3、Q4、Q5 and Q 6 are conducted and cut off at proper time to realize inversion of direct current, when in a reverse constant current mode, the switching tube Q 3、Q5 is conducted alternately with a duty ratio of 50%, the switching tube Q 1、Q2 does not provide a trigger signal, only a diode works, the secondary side converts direct current received from a load into high-frequency alternating current through a half-bridge inverter, the secondary side inverter structure can ensure that the current can be efficiently transmitted between the secondary side and the primary side, the system can control the output direction of voltage and current, in a reverse transmission mode, the primary side inverter is switched into a half-wave rectification mode and is responsible for converting alternating current signals transmitted by the secondary side into direct current for the primary side load or feeding back the direct current to a power grid, in the half-wave rectification mode, the primary side inverter can receive and rectify alternating current signals from the secondary side inverter into stable direct current, in the reverse transmission mode, the secondary side reversely transmits energy to the primary side through the half-bridge inverter as a rectifier and receives the direct current and converts the alternating current into the stable direct current, and the reverse transmission efficiency of the system is improved, and the system can stably recover the direct current flow, and the power flow to the system is stable in the reverse transmission mode; in the forward transmission mode, the primary side inverter adjusts the high-frequency inversion frequency and the working mode according to the load requirement, ensures that the alternating current energy passing through the primary side coil can be stably transmitted to the secondary side, the secondary side switch network processes the alternating current signals through half-wave rectification and converts the alternating current signals into stable direct current to be output to the secondary side load, in the reverse transmission mode, the secondary side switch network is switched to the half-bridge inverter to work, the high-frequency alternating current is generated by controlling the on and off of a switch tube, the primary side inverter works as a half-wave rectifier, rectifies the alternating current signal from the secondary side, converts the alternating current signal into direct current, and feeds the direct current back to the primary side or a power grid.
Further, the parameters of the variable primary compensation network and the variable secondary compensation network should satisfy the following resonance conditions:
;
;
;
;
;
Wherein ω is the operating angular frequency of the system, L 1 is the series compensation inductance, C 1 is the parallel compensation capacitance, L 2 is the series compensation inductance, C 2 is the parallel compensation capacitance, L s is the secondary coil, C s is the series compensation capacitance, L p1 is the first coil, C p1 is the first series compensation capacitance, L p2 is the second coil, and C p2 is the second series compensation capacitance.
The control strategy can be realized by a compensation network of a dynamic adjusting circuit, for example, the primary side controller can monitor the magnetic field change between the primary side coil and the secondary side coil in real time, adjust the frequency of the inverter and the working state of the compensation capacitor according to feedback information, adopt proper compensation inductance and capacitance components (such as LCC, S-shaped topology and the like) to ensure the phase synchronization of the magnetic field, the effect of the compensation network is to adjust the phase of the current, compensate the phase difference caused by the asymmetry of coupling so as to realize zero phase difference, the working frequency of the inverter is adjusted through the controller, the voltage and the current of the primary side and the secondary side always keep zero phase difference in the working process, the control strategy can be realized by reasonably selecting a compensation network of the dynamic adjusting circuit, for example, the primary side controller can monitor the magnetic field change between the primary side coil and the secondary side coil according to feedback information, adjust the working state of the inverter frequency and the compensation capacitor according to feedback information, and ensure that the phase difference of the magnetic field is synchronous, the phase of the compensation network is adjusted to compensate the phase difference caused by the phase difference of the current, and the working state of the primary side is adjusted according to the phase difference of the feedback information, and the phase difference of the primary side is kept to be high, and the synchronous when the primary side and secondary side is required to be synchronous.
Further, as shown in fig. 7, the system provides a constant current independent of the load in the constant current output mode and provides a constant voltage independent of the load in the constant voltage output mode through cooperative switching of the asymmetric coupling structure and the variable compensation network.
Embodiment two;
Based on the same inventive concept as the asymmetric coupling variable coil type bidirectional wireless power transmission system in the previous embodiment, the invention also provides an asymmetric coupling variable coil type bidirectional wireless power transmission method, which comprises the following steps:
collecting double-end electric energy parameters of an output end and an input end in real time, and analyzing and obtaining adjustment requirements;
Controlling physical switching of the contacts of the primary side controller and logical reconstruction of the secondary side switching tube network according to the regulation requirement to generate a multidimensional control frame;
Establishing a bidirectional zero-phase difference resonance condition based on the double-end electric energy parameters of the variable primary side compensation network and the variable secondary side compensation network;
according to the multidimensional control frame and the space orthogonal layout of the first coil and the second coil, constructing a mutual inductance adjusting channel of the primary coil and the secondary coil, and maintaining a bidirectional transmission path when redundant coupling is eliminated;
Based on the synergistic effect of the multidimensional control framework and the bidirectional zero-phase difference resonance condition, constant current or constant voltage output irrelevant to loads is realized in a bidirectional transmission scene through the current source characteristic of the LCC topology and the voltage source characteristic of the S-S topology.
The adjustment method in the invention can effectively realize an asymmetric coupling variable coil type bidirectional wireless power transmission system, and the technical effects can be achieved as described in the embodiment, and the description is omitted here.
Embodiment three;
Based on the same inventive concept as the asymmetric coupling variable coil type bidirectional wireless power transmission system in the previous embodiment, the invention also provides an asymmetric coupling variable coil type bidirectional wireless power transmission device for realizing the asymmetric coupling variable coil type bidirectional wireless power transmission system.
The device in the invention can effectively realize an asymmetric coupling variable coil type bidirectional wireless power transmission system, and the technical effects can be achieved as described in the embodiment, and the description is omitted here.
Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the scope of the application. Thus, the present application is intended to include such modifications and alterations insofar as they come within the scope of the application or the equivalents thereof.
Claims (10)
1. An asymmetrically coupled variable coil bi-directional wireless power transfer system, the system comprising a grid-side unit and a load-side unit, wherein:
The power grid side unit comprises a primary side direct current power supply U dc1, a primary side inverter, a variable primary side compensation network, a primary side coil assembly, a primary side controller and a power grid side control unit, wherein the primary side inverter comprises a switching tube Q 1、Q2 which is connected with the primary side direct current power supply;
The load side unit comprises a secondary side direct current power supply U dc2, a secondary side switch network, a variable secondary side compensation network, a secondary side coil L s, a secondary side controller and a control circuit, wherein the secondary side switch network comprises a switch tube Q 3、Q4、Q5、Q6 which is connected with the secondary side direct current power supply;
And according to the asymmetric coupling structure of the primary coil assembly and the secondary coil L s, wireless bidirectional constant current or wireless bidirectional constant voltage transmission of electric energy is performed.
2. The asymmetrically coupled variable coil bi-directional wireless power transfer system of claim 1, wherein:
In the primary coil assembly, the first coil L p1 is a loop coil, and the second coil L p2 is a double-D coil;
the first coil is arranged around the second coil, and a ferrite isolation layer is arranged between the first coil and the second coil;
The secondary coil L s is a ring coil, is wound on a ferrite substrate, and is spatially and vertically arranged with the first coil L p1.
3. The asymmetrically coupled variable coil bi-directional wireless power transfer system of claim 1, wherein:
The variable primary side compensation network comprises a series compensation inductance L 1, a parallel compensation capacitor C 1, a first series compensation capacitor C p1, a second series compensation capacitor C p2 and the primary side controller S;
the switching end of the primary side controller S is connected between the output end of the primary side inverter and the series compensation inductance L 1;
The other end of the series compensation inductance L 1 is connected with one end of the parallel compensation capacitor C 1 and one end of the second series compensation capacitor C p2;
the other end of the second series compensation capacitor C p2 is connected with the second coil L p2;
One end of the first series compensation capacitor C p1 is connected to the output end of the primary side inverter through the switching of the primary side controller S, and the other end is connected to the first coil L p1.
4. The asymmetrically coupled variable coil bi-directional wireless power transfer system of claim 1, wherein:
The variable secondary side compensation network comprises a series compensation inductance L 2, a parallel compensation capacitance C 2, a series compensation capacitance C s and the secondary side switch network;
One end of the series compensation inductor L 2 is connected to the negative electrode of the secondary side direct current power supply U dc2 through a switch tube Q 6, and the other end of the series compensation inductor L 2 is connected with one end of the parallel compensation capacitor C 2 and one end of the series compensation capacitor C s;
The other end of the parallel compensation capacitor C 2 is connected with a node between the switching tube Q 4 and the switching tube Q 5;
The other end of the series compensation capacitor C s is connected with one end of the secondary coil L s;
The other end of the secondary coil L s is connected with a node between the switching tube Q 5 and the switching tube Q 6.
5. The asymmetrically coupled variable coil bi-directional wireless power transfer system of claim 1, wherein the primary side controller and secondary side controller are further configured to comprise:
In a constant current output mode, controlling the primary side controller S to disconnect a connection node a of the first coil L p1, connect a node b and constantly conduct switching tubes Q 4 and Q 6 in the secondary side switching network, so that the variable secondary side compensation network forms an LCC topology;
in the constant voltage output mode, the primary side controller S is controlled to be connected with the connection node a and connected with the first coil L p1, the switching tube Q 3 in the secondary side switching network is constantly conducted, the switching tube Q 6 is constantly turned off, and the variable secondary side compensation network forms an S-type topology.
6. The asymmetrically coupled variable coil bi-directional wireless power transfer system of claim 1, wherein the bi-directional transfer mode is performed comprising:
during forward transmission, the primary side inverter works in a high-frequency inversion state, and the secondary side switch network operates as a half-wave rectifier;
during reverse transmission, the secondary side switch network is switched to a half-bridge inversion state, and the primary side inverter operates as a half-wave rectifier.
7. The asymmetrically coupled variable coil bi-directional wireless power transfer system of claim 6, wherein parameters of the variable primary side compensation network and the variable secondary side compensation network are adapted to satisfy the following resonance conditions:
;
;
;
;
;
Wherein ω is the operating angular frequency of the system, L 1 is a series compensation inductance, C 1 is a parallel compensation capacitance, L 2 is a series compensation inductance, C 2 is a parallel compensation capacitance, L s is the secondary coil, C s is a series compensation capacitance, L p1 is the first coil, C p1 is a first series compensation capacitance, L p2 is the second coil, and C p2 is a second series compensation capacitance.
8. The asymmetrically coupled variable coil bi-directional wireless power transfer system of claim 1, wherein:
the system provides constant current irrelevant to a load in a constant current output mode and constant voltage irrelevant to the load in a constant voltage output mode through cooperative switching of the asymmetric coupling structure and the variable compensation network.
9. A method of asymmetrically coupled variable coil bi-directional wireless power transfer, the method comprising:
collecting double-end electric energy parameters of an output end and an input end in real time, and analyzing and obtaining adjustment requirements;
Controlling physical switching of the contacts of the primary side controller and logical reconstruction of the secondary side switching tube network according to the regulation requirement to generate a multidimensional control frame;
Establishing a bidirectional zero-phase difference resonance condition based on the double-end electric energy parameters of the variable primary side compensation network and the variable secondary side compensation network;
according to the multidimensional control frame and the space orthogonal layout of the first coil and the second coil, constructing a mutual inductance adjusting channel of the primary coil and the secondary coil, and maintaining a bidirectional transmission path when redundant coupling is eliminated;
Based on the synergistic effect of the multidimensional control framework and the bidirectional zero-phase difference resonance condition, constant current or constant voltage output irrelevant to loads is realized in a bidirectional transmission scene through the current source characteristic of the LCC topology and the voltage source characteristic of the S-S topology.
10. An asymmetrically coupled variable coil bi-directional wireless power transfer device for implementing an asymmetrically coupled variable coil bi-directional wireless power transfer system as claimed in claims 1-8.
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| CN104718682A (en) * | 2012-10-11 | 2015-06-17 | 株式会社村田制作所 | wireless power supply |
| CN116780790A (en) * | 2023-07-12 | 2023-09-19 | 中国电子科技集团公司第十四研究所 | Inductive wireless power transmission system constant current and constant voltage output control system and method |
| CN116979580A (en) * | 2023-07-04 | 2023-10-31 | 广西电网有限责任公司电力科学研究院 | Bidirectional WPT system that switches constant voltage and constant current output through switching compensation topology |
| CN119182233A (en) * | 2024-11-13 | 2024-12-24 | 哈尔滨电气集团海洋智能装备有限公司 | Wireless power transmission system with reconfigurable topology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104718682A (en) * | 2012-10-11 | 2015-06-17 | 株式会社村田制作所 | wireless power supply |
| CN116979580A (en) * | 2023-07-04 | 2023-10-31 | 广西电网有限责任公司电力科学研究院 | Bidirectional WPT system that switches constant voltage and constant current output through switching compensation topology |
| CN116780790A (en) * | 2023-07-12 | 2023-09-19 | 中国电子科技集团公司第十四研究所 | Inductive wireless power transmission system constant current and constant voltage output control system and method |
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