Modular High-Efficiency Extended Coupled System for Wireless Power Supply Area and Its Construction Method

Abstract

This invention discloses a modular, high-efficiency, extended coupling system for wireless power supply and its construction method. The system includes at least two minimum coupling systems and at least one power receiving unit. Each minimum coupling system includes a DC power supply, a high-frequency inverter, a T-type compensation unit, and two power transmitting units. The DC power supply provides DC power; the high-frequency inverter is connected to the DC power supply to convert the DC power to AC power; the T-type compensation unit is connected to the high-frequency inverter to remove cross-coupling of the transmitting coils in the power transmitting units; both power transmitting units are connected to the T-type compensation unit to wirelessly transmit power to at least one power receiving unit. This invention not only eliminates the coupling of the transmitting coils in a two-dimensional direction but also significantly reduces the number of inverters and decoupling coils required, effectively saving system costs.

Description

Technical Field

[0001] This invention relates to the field of wireless power transmission technology, and in particular to a modular, efficient, and extended coupling system for wireless power supply and its construction method. Background Technology

[0002] Magnetic-coupled resonant wireless power transfer technology is widely used in electric vehicles, medical equipment, and other fields due to its advantages of safety, efficiency, convenience, and flexibility. To expand the wireless power supply area and increase the degree of freedom in power supply, the transmitting coils can be arranged in a matrix. However, the transmitting coils exhibit cross-coupling in multiple directions, leading to a series of problems such as reduced system efficiency and increased current stress on switching devices.

[0003] Existing decoupling methods mainly include circuit topology design, magnetic coupling coil design, and power converter decoupling control. Power converter decoupling control uses the phase difference between inverter voltage and current to detect and adjust the overall system resonance state in real time, but its implementation is complex, and its effective application is difficult. Circuit topology design compensates for the cross-inductance between transmitting coils by increasing the capacitor connected in series with the transmitting coil, but this method cannot eliminate cross-coupling of transmitting coils in multiple directions. Magnetic coupling coil design achieves decoupling by adding decoupling coils. However, directly using decoupling coils to decouple transmitting coils in a two-dimensional direction requires one transmitting coil to be connected in series with four decoupling coils to achieve decoupling from adjacent transmitting coils, significantly increasing the size of the coupling coils and hindering practical installation and application. Furthermore, existing decoupling methods are only suitable for eliminating cross-coupling of transmitting coils in a single direction and cannot solve the coupling problem of transmitting coils in a two-dimensional direction. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to provide a modular, efficient, and expandable coupling system for wireless power supply areas. This system not only eliminates the coupling of the transmitting coil in a two-dimensional direction but also significantly reduces the number of inverters and decoupling coils required, effectively saving system costs.

[0005] The second objective of this invention is to provide a method for constructing a modular, efficient, and extended coupling system for wireless power supply.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A modular, efficient, and expandable coupling system for wireless power supply areas, comprising:

[0008] At least two minimally coupled systems and at least one power receiving unit, each of the minimally coupled systems comprising:

[0009] A DC power supply is used to provide DC power.

[0010] A high-frequency inverter, connected to the DC power supply, is used to invert the DC power into AC power;

[0011] The T-type compensation unit is connected to the high-frequency inverter and is used to remove the cross-coupling of the transmitting coil in the power transmitting unit;

[0012] Both power transmitting units are connected to the T-type compensation unit and are used to wirelessly transmit electrical energy to at least one of the power receiving units.

[0013] Optionally, the T-type compensation unit includes: a first passive element to a third passive element, one end of the first passive element being connected to the first output terminal of the high-frequency inverter, the other end of the first passive element being connected to one end of the second passive element and the third passive element, the other end of the second passive element being connected to the input terminal of the first power transmitting unit, and the other end of the third passive element being connected to the second output terminal of the high-frequency inverter and the input terminal of the second power transmitting unit.

[0014] Optionally, each of the power transmitting units includes two switches, a transmitting coil, a first compensation capacitor, and at least one decoupling coil, wherein the first switch, the transmitting coil, the first compensation capacitor, and at least one decoupling coil are connected in series and then connected in parallel with the second switch, and the decoupling coil is used to remove the cross coupling of the transmitting coil in the power transmitting unit.

[0015] Optionally, the power receiving unit includes a receiving coil, a second compensation capacitor, a rectifier, and a load resistor, wherein the two ends of the receiving coil and the second compensation capacitor connected in series are respectively connected to the two input terminals of the rectifier, and the output terminal of the rectifier is connected to the load resistor.

[0016] Optionally, each of the transmitting coils is a monopole coil, and each of the decoupling coils is a bipole coil.

[0017] Optionally, the transmitting coils in each power transmitting unit are arranged in a matrix, wherein adjacent transmitting coils overlap by the same distance.

[0018] Optionally, when the transmitting coil is located at the corner of the array, the corresponding power transmitting unit includes one decoupling coil; when the transmitting coil is located at the edge of the array, the corresponding power transmitting unit includes two decoupling coils; and when the transmitting coil is located in the middle of the array, the corresponding power transmitting unit includes three decoupling coils.

[0019] To achieve the above objectives, a second aspect of the present invention provides a method for constructing a modular, efficient, and scalable coupling system for wireless power supply areas, applicable to the aforementioned modular, efficient, and scalable coupling system for wireless power supply areas, comprising:

[0020] Step S1: Configure the parameters of the passive components in the T-type compensation unit and the parameters of the decoupling coil in the power transmission unit in the minimum coupling system;

[0021] Step S2: Obtain the T-type compensation unit and the power transmission unit by configuring the parameters, so as to construct the minimum coupling system through the T-type compensation unit and the power transmission unit;

[0022] Step S3: Construct a modular, efficient, extended coupling system for wireless power supply based on at least two of the minimum coupling systems.

[0023] Optionally, step S1 includes:

[0024] Step S11: Obtain the structural parameters of the transmitting coil and the receiving coil, so as to obtain the self-inductance values ​​of the transmitting coil and the receiving coil based on the structural parameters;

[0025] Step S12: In the dual-transmitter coil power supply mode, with the goal of minimizing the mutual inductance fluctuation between the transmitting coil and the receiving coil, determine the overlap distance between the transmitting coils;

[0026] Step S13: Based on the principle that the values ​​of the transmit and receive mutual inductance remain consistent and maximized in single-transmitter coil power supply mode, dual-transmitter coil power supply mode and four-transmitter coil power supply mode, divide the power supply area for each power supply mode.

[0027] Step S14: After determining the overlap distance of the transmitting coil and the power supply area of ​​each power supply mode, the self-inductance value of the decoupling coil is determined by simulation with the goal of minimizing the difference between the cross mutual inductance of the transmitting coil and the coupling mutual inductance of the decoupling coil.

[0028] Step S15: Determine the passive component parameters in the T-type compensation unit based on the self-inductance values ​​of the transmitting coil and the receiving coil, the cross mutual inductance of the transmitting coil, the coupling mutual inductance and self-inductance value of the decoupling coil.

[0029] Optionally, in step S15, the passive component parameters within the T-type compensation unit are determined using the following formula, where the passive component parameters are the reactances of the first to the third passive components:

[0030]

[0031] Where X1, X2, and X3 are the reactances of the first to the third passive components, respectively, ω is the operating angular frequency, j represents the imaginary part, and L... s C is the self-inductance value of the receiving coil. s Let X be the capacitance value of the second compensation capacitor, where X pe X is the equivalent impedance of the power transmitting unit. pe The values ​​are as follows for single-transmitter coil operation mode and dual-transmitter coil operation mode:

[0032]

[0033] Among them, X p X is the equivalent impedance of a single power transmitting unit. p =jωL p +A*jωL DD +1 / jωC p M pp For the cross-inductance of the transmitting coil, M DD The coupling mutual inductance of the decoupling coils is given by A, where A is the number of decoupling coils connected to the transmitting coil, and L is the number of decoupling coils connected to the transmitting coil. p L is the self-inductance of the transmitting coil. DD C is the self-inductance value of the decoupling coil. p This is the capacitance value of the first compensation capacitor.

[0034] This invention has at least the following technical effects:

[0035] This invention eliminates the coupling of the transmitting coils in the minimum coupling system by setting a T-type compensation unit and configuring the compensation element parameters. Furthermore, by adding a decoupling coil and designing its structural parameters, the coupling between transmitting coils in the minimum coupling system can be eliminated. This invention's modular, high-efficiency, extended coupling system for wireless power supply not only achieves effective decoupling of the transmitting coils in a two-dimensional direction but also reduces the nonlinearity of the cross-coupling of the transmitting coils and decreases the required number of inverters and decoupling coils, thus saving system costs.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the circuit topology of a modular, efficient, and extended coupling system for wireless power supply in an embodiment of the present invention.

[0038] Figure 2 This is a schematic diagram of a dynamic wireless power supply array according to an embodiment of the present invention.

[0039] Figure 3This is a planar schematic diagram of the four transmitting coils according to an embodiment of the present invention.

[0040] Figures 4(a)-4(c) These are structural diagrams of the transmitting coil, receiving coil, and decoupling coil from various perspectives in embodiments of the present invention.

[0041] Figure 5 This is a flowchart illustrating the construction method of a modular, efficient, and extended coupling system for wireless power supply in an embodiment of the present invention.

[0042] Figure 6 This is a decoupling circuit diagram for a given embodiment of the present invention where the four transmitting coils are arranged in a matrix.

[0043] Figure 7 This is a schematic diagram of the power supply area for single-transmitter, dual-transmitter, and quad-transmitter configurations according to embodiments of the present invention.

[0044] Figure 8 This is a schematic diagram illustrating the change in cross-inductance of the transmitting coils with the position of the receiving coil before and after adding a decoupling coil in the dual-transmitting coil power supply mode obtained from the simulation of an embodiment of the present invention.

[0045] Figure 9 This is a schematic diagram of the voltage and current waveforms at the output port of the inverter in the minimum coupling system under the dual-emitting coil power supply mode according to an embodiment of the present invention. Detailed Implementation

[0046] The following describes this embodiment in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0047] The following description, with reference to the accompanying drawings, illustrates a modular, efficient, and expandable wireless power supply system and its construction method.

[0048] Figure 1 This is a schematic diagram of the circuit topology of a modular, high-efficiency, and expandable coupling system for wireless power supply in an embodiment of the present invention. Figure 1 As shown, this modular, efficient, and expandable coupling system for wireless power supply includes: at least two minimum coupling systems and at least one power receiving unit, such as... Figure 1 The system includes N / 2 minimum coupled systems, wherein the power receiving unit is the topology part where the rectifier is located. In this embodiment, each minimum coupled system includes: a DC power supply, a high-frequency inverter, a T-type compensation unit (i.e., the T-type compensation topology in the figure), and two power transmitting units.

[0049] The DC power supply provides DC power; the high-frequency inverter is connected to the DC power supply to convert DC power into AC power; the T-type compensation unit is connected to the high-frequency inverter to remove the cross-coupling of the transmitting coil in the power transmitting unit; both power transmitting units are connected to the T-type compensation unit to wirelessly transmit electrical energy to at least one power receiving unit.

[0050] Specifically, the system's power transmitter is constructed by extending multiple minimally coupled systems in a two-dimensional plane. This includes a modular, high-efficiency extended coupling system for wireless power supply areas comprising N / 2 minimally coupled systems, with N ≥ 4, meaning at least two minimally coupled systems. In this embodiment, the location of the power receiver unit can be random, and it can have various coupling forms with the system's power transmitter, such as single-single, single-many, and many-many. That is, during system operation, one or more power transmitter units supply power to one or more power receiver units; in other words, the system wirelessly transmits electrical energy from one or more power transmitter units to one or more power receiver units.

[0051] Furthermore, such as Figure 1 As shown, the T-type compensation unit, i.e., the T-type compensation topology, includes a first passive element to a third passive element, wherein the reactances of the first passive element to the third passive element are X1, X2, and X3, respectively. Taking the minimum coupling system 1 as an example, the connection relationship of the internal passive elements of the T-type compensation unit is explained. That is, one end of the first passive element is connected to the first output terminal of the high-frequency inverter, the other end of the first passive element is connected to one end of the second passive element and the third passive element, the other end of the second passive element is connected to the input terminal of the first power transmitting unit, such as power transmitting unit 1, and the other end of the third passive element is connected to the second output terminal of the high-frequency inverter and the input terminal of the second power transmitting unit, such as power transmitting unit 2.

[0052] In this embodiment, each power transmitting unit, such as power transmitting unit 1, includes two switches S, a transmitting coil, a first compensation capacitor, and at least one decoupling coil. The first switch, transmitting coil, first compensation capacitor, and at least one decoupling coil are connected in series and then in parallel with the second switch. The self-inductance of the transmitting coil is L. p The capacitance value of the first compensation capacitor is C. p The self-inductance of the decoupling coil is L DD When the first switch is turned on and the second switch is turned off, the corresponding transmitting coil is energized.

[0053] Furthermore, the power receiving unit includes a receiving coil, a second compensation capacitor, a rectifier, and a load resistor. The two ends of the series connection between the receiving coil and the second compensation capacitor are respectively connected to the two input terminals of the rectifier, and the output terminal of the rectifier is connected to the load resistor. The self-inductance of the receiving coil is L. sThe capacitance value of the second compensation capacitor is C. s .

[0054] In this embodiment, the DC power supplied by the DC power source is converted into high-frequency AC power by a high-frequency inverter, and then flows into the transmitting coil through a T-type compensation unit to generate a high-frequency alternating magnetic field. The receiving coil induces an AC current with the same frequency as the current in the transmitting coil in the high-frequency alternating magnetic field, which is then converted into DC power by a rectifier to supply power to the load. The transmitting coil, decoupling coil, receiving coil, and components in the T-type compensation unit can be configured with parameters to form a resonant circuit, thereby achieving efficient wireless power transmission.

[0055] Additionally, for the coupling of the transmitting coil in a minimum coupling system, the following settings can be configured: Figure 1 The T-shaped compensation unit in the system eliminates coupling through parameter configuration of the compensation elements. For coupling between the transmitting coils in the minimum coupled systems, decoupling coils can also be set and eliminated through coil structure parameter design. It should be noted that each minimum coupled system further requires that its high-frequency inverters operate at the same frequency. Each transmitting coil is further required to have a nonlinear shielding layer with identical structural parameters, and each receiving coil is further required to have a nonlinear shielding layer with identical structural parameters.

[0056] Figure 2 This is a schematic diagram of a dynamic wireless power supply array according to an embodiment of the present invention. Figure 2 As shown, all transmitting coils are arranged in a matrix, with adjacent transmitting coils overlapping by the same distance, and decoupling coils are placed at the center of the transmitting coils. Each transmitting coil is a monopole coil, and each decoupling coil is a bipole coil, ensuring no coupling between the transmitting and decoupling coils. In this embodiment, the system power supply array is constructed by two-dimensionally expanding a minimum module consisting of four transmitting coils. The number of decoupling coils connected in series with a transmitting coil varies depending on its position in the array. When a transmitting coil is located at a corner of the array, it is connected in series with one decoupling coil; when it is located at the boundary of the array, it is connected in series with two decoupling coils; and when it is located in the middle of the array, it is connected in series with three decoupling coils.

[0057] Figure 3 This is a planar schematic diagram of the four transmitting coils according to an embodiment of the present invention. Figure 3 As shown, the four transmitting coils are arranged in a matrix, all located at the corners. To facilitate modularity of the power transmitting unit, adjacent transmitting coils overlap by the same distance, and all transmitting coils have identical structural parameters.

[0058] Figure 4(a) , 4(b)Figures 4(c) are structural diagrams of the transmitting coil, receiving coil, and decoupling coil from various perspectives in embodiments of the present invention. Both the transmitting and receiving coils include ferrite cores, which can reduce magnetic leakage between the transmitting and receiving coils and improve energy transmission efficiency, but will result in significant mutual inductance between adjacent transmitting coils. In some embodiments, the transmitting and receiving coils can be changed to other shapes, such as circular or rectangular.

[0059] Figure 5 This is a flowchart illustrating a construction method for a modular, efficient, and scalable wireless power supply area coupling system according to an embodiment of the present invention. This construction method is applied to the aforementioned modular, efficient, and scalable wireless power supply area coupling system, such as... Figure 5 As shown, the method includes:

[0060] Step S1: Configure the parameters of the passive components in the T-type compensation unit and the parameters of the decoupling coil in the power transmission unit in the minimum coupling system;

[0061] Step S2: Obtain the T-type compensation unit and power transmission unit by configuring the parameters, and construct the minimum coupling system using the T-type compensation unit and power transmission unit;

[0062] Step S3: Construct a modular, efficient, extended coupling system for wireless power supply based on at least two minimum coupling systems.

[0063] Figure 6 This is a decoupling circuit diagram showing the four transmitting coils arranged in a matrix according to an embodiment of the present invention. Based on this decoupling circuit, the configuration methods for the passive component parameters in the T-type compensation unit and the decoupling coil parameters in the power transmitting unit in the minimum coupling system are described in detail.

[0064] Step S1 includes:

[0065] Step S11: Obtain the structural parameters of the transmitting coil and the receiving coil, so as to obtain the self-inductance values ​​of the transmitting coil and the receiving coil based on the structural parameters.

[0066] Specifically, the structural parameters of the transmitting and receiving coils can be determined based on the actual operating conditions to obtain the self-inductance value L of the transmitting and receiving coils. p and L s .

[0067] Step S12: In the dual-transmitter coil power supply mode, determine the overlap distance between the transmitter coils with the goal of minimizing the mutual inductance fluctuation between the transmitter coil and the receiver coil.

[0068] Specifically, based on step S11, the mutual inductance between the transmitting and receiving coils in the dual-transmitter coil power supply mode can be simulated using Maxwell (electromagnetic simulation software) as the position of the receiving coil changes. The overlap distance between the transmitting coils is determined with the goal of minimizing the fluctuation of the mutual inductance.

[0069] Step S13: Based on the principle that the values ​​of the transmit and receive mutual inductance remain consistent and maximized in single-transmitter coil power supply mode, dual-transmitter coil power supply mode and four-transmitter coil power supply mode, divide the power supply area for each power supply mode.

[0070] Specifically, based on step S13, the changes in transceiver mutual inductance with the position of the receiving coil are simulated under single-transmitter, dual-transmitter, and quad-transmitter power supply modes. The single-transmitter, dual-transmitter, and quad-transmitter power supply regions are divided based on the principle that the transceiver mutual inductance values ​​remain consistent and maximized across different power supply modes. Figure 7 As shown in the diagram, the circular white area represents the single-transmitter coil power supply area, the black area represents the dual-transmitter coil power supply area, the central white square area represents the four-transmitter coil power supply area, and the remaining white areas represent inactive power supply areas.

[0071] Step S14: After determining the overlap distance of the transmitting coil and the power supply area of ​​each power supply mode, the self-inductance value of the decoupling coil is determined by simulation with the goal of minimizing the difference between the cross mutual inductance of the transmitting coil and the coupling mutual inductance of the decoupling coil.

[0072] Specifically, based on step S13, the cross-inductance M of the transmitting coil can be... pp Mutual inductance M with decoupling coil DD With the goal of minimizing the difference, the structural parameters of the decoupling coil were determined by simulation using Maxwell software, and its self-inductance value LDD was obtained.

[0073] Step S15: Determine the passive component parameters in the T-type compensation unit based on the self-inductance values ​​of the transmitting and receiving coils, the cross-inductance of the transmitting coil, the coupling inductance of the decoupling coil, and the self-inductance value.

[0074] Specifically, based on step S14, the passive component parameters within the T-type compensation unit, namely reactances X1, X2, and X3, and the capacitance value C of the first compensation capacitor connected in series with the transmitting coil, can be determined. p The capacitance value C of the second compensation capacitor connected in series with the receiving coil. s .

[0075] Furthermore, in order for the system to operate in a resonant state, the parameters of the compensation components must meet the following conditions, namely, the parameters of the passive components in the T-type compensation unit are determined by the following formula in step S15, wherein the parameters of the passive components are the reactances of the first to the third passive components:

[0076]

[0077] Where X1, X2, and X3 are the reactances of the first to the third passive components, respectively, ω is the operating angular frequency, j represents the imaginary part, and L... s C is the self-inductance value of the receiving coil. s Let X be the capacitance value of the second compensation capacitor, where X pe X is the equivalent impedance of the power transmitting unit. pe The values ​​are as follows for single-transmitter coil operation mode and dual-transmitter coil operation mode:

[0078]

[0079] Among them, X p X is the equivalent impedance of a single power transmitting unit. p =jωL p +A*jωL DD +1 / jωC p M pp For the cross-inductance of the transmitting coil, M DD The coupling mutual inductance of the decoupling coils is given by A, where A is the number of decoupling coils connected to the transmitting coil, and L is the number of decoupling coils connected to the transmitting coil. p L is the self-inductance of the transmitting coil. DD C is the self-inductance value of the decoupling coil. p This is the capacitance value of the first compensation capacitor. Since all four transmitting coils are located at the corners, A is set to 1.

[0080] Furthermore, substituting formula (2) into formula (1) yields:

[0081]

[0082] When X1, X2, and X3 are positive, the passive component being compensated is an inductor; when they are negative, the passive component being compensated is a capacitor. When there are multiple combinations of X1, X2, and X3 that satisfy equation (3), the costs of different combinations are compared, and the combination with the lowest cost is selected.

[0083] Figure 8 This is a schematic diagram illustrating the change in cross-inductance of the transmitting coils with the position of the receiving coil before and after adding a decoupling coil in a dual-transmitting coil power supply mode, obtained from a simulation of an embodiment of the present invention. Figure 8It can be seen that before adding the decoupling coil, the maximum and minimum cross-inductance of the transmitting coil differed by approximately 10 μH during the movement of the receiving coil, with the maximum cross-inductance reaching around 35 μH. After adding the decoupling coil, the minimum and maximum cross-inductance of the transmitting coil were 0.5 μH and 2.4 μH, respectively. Therefore, the use of the decoupling coil not only effectively reduced the cross-inductance of the transmitting coil but also significantly reduced its nonlinearity, simplifying the design of subsequent compensation topology parameters.

[0084] Figure 9 This is a schematic diagram of the inverter output port voltage and current waveforms in a minimum coupling system under dual-emitting coil power supply mode according to an embodiment of the present invention. Uinv and Iinv represent the inverter output port voltage and current, respectively. Figure 9 It can be seen that the T-type compensation unit enables the minimum coupling system to be tuned when operating with a single transmitting coil and a dual transmitting coil, demonstrating the effectiveness of the single-source high-order composite compensation topology design.

[0085] It should be noted that the method of the present invention can be extended to the case of an infinite number of transmitting coils arranged in a matrix.

[0086] In summary, this invention eliminates the coupling of the transmitting coils in the minimum coupling system by setting a T-type compensation unit and configuring the compensation element parameters. Furthermore, by adding decoupling coils and designing their structural parameters, the coupling of the transmitting coils between systems in the minimum coupling system can be eliminated. Specifically, the T-type compensation topology can be used to eliminate the coupling of the transmitting coils in the horizontal direction, and the decoupling coils can be used to eliminate the coupling of the transmitting coils in the vertical direction. That is, the modular, efficient, and extended coupling system for wireless power supply of this invention can effectively decouple the transmitting coils in two dimensions, reduce the nonlinearity of the cross-coupling of the transmitting coils, and reduce the number of inverters and decoupling coils required, thus saving system costs.

[0087] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0088] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A modular, high-efficiency, expandable coupling system for wireless power supply, characterized in that, include: At least two minimally coupled systems and at least one power receiving unit, each of the minimally coupled systems comprising: A DC power supply is used to provide DC power. A high-frequency inverter, connected to the DC power supply, is used to invert the DC power into AC power; The T-type compensation unit is connected to the high-frequency inverter and is used to remove the cross-coupling of the transmitting coil in the power transmitting unit; Both power transmitting units are connected to the T-type compensation unit and are used to wirelessly transmit electrical energy to at least one of the power receiving units; The T-shaped compensation unit includes: The first passive element to the third passive element, one end of the first passive element is connected to the first output terminal of the high-frequency inverter, the other end of the first passive element is connected to one end of the second passive element and the third passive element, the other end of the second passive element is connected to the input terminal of the first power transmitting unit, and the other end of the third passive element is connected to the second output terminal of the high-frequency inverter and the input terminal of the second power transmitting unit. Each of the power transmitting units includes two switches, a transmitting coil, a first compensation capacitor, and at least one decoupling coil. The first switch, the transmitting coil, the first compensation capacitor, and at least one decoupling coil are connected in series and then connected in parallel with the second switch. The decoupling coil is used to remove the cross-coupling of the transmitting coil in the power transmitting unit. The passive component parameters within the T-type compensation unit are determined using the following formula, where the passive component parameters are the reactances of the first to the third passive components: in, X 1. X 2. X 3 represents the reactance of the first to the third passive components, respectively. ω The operating angular frequency, j Indicates the imaginary part. L s The self-inductance value of the receiving coil. C s Let be the capacitance value of the second compensation capacitor, where X pe This is the equivalent impedance of the power transmitting unit. X pe The values ​​are as follows for single-transmitter coil operation mode and dual-transmitter coil operation mode: in, X p The equivalent impedance of a single power transmitting unit. X p = jωL p + A*jωL DD +1 / jωC p , M pp For the cross-inductance of the transmitting coil, M DD To decouple the mutual inductance of the coils, A The number of decoupling coils connected to the transmitting coil. L p This is the self-inductance value of the transmitting coil. L DD This is the self-inductance value of the decoupling coil. C p This is the capacitance value of the first compensation capacitor.

2. The wireless power supply area modular high-efficiency extended coupling system as described in claim 1, characterized in that, The power receiving unit includes a receiving coil, a second compensation capacitor, a rectifier, and a load resistor. The two ends of the receiving coil and the second compensation capacitor connected in series are respectively connected to the two input terminals of the rectifier, and the output terminal of the rectifier is connected to the load resistor.

3. The wireless power supply area modular high-efficiency extended coupling system as described in claim 2, characterized in that, Each of the transmitting coils is a monopole coil, and each of the decoupling coils is a bipole coil.

4. The wireless power supply area modular high-efficiency extended coupling system as described in claim 3, characterized in that, The transmitting coils in each power transmitting unit are arranged in a matrix, wherein adjacent transmitting coils overlap by the same distance.

5. The wireless power supply area modular high-efficiency extended coupling system as described in claim 4, characterized in that, When the transmitting coil is located at the corner of the array, the corresponding power transmitting unit includes one decoupling coil; when the transmitting coil is located at the edge of the array, the corresponding power transmitting unit includes two decoupling coils; when the transmitting coil is located in the middle of the array, the corresponding power transmitting unit includes three decoupling coils.

6. A method for constructing a modular, efficient, and expandable coupling system for wireless power supply areas, applied to the modular, efficient, and expandable coupling system for wireless power supply areas as described in any one of claims 1-5, characterized in that, include: Step S1: Configure the parameters of the passive components in the T-type compensation unit and the parameters of the decoupling coil in the power transmission unit in the minimum coupling system; Step S2: Obtain the T-type compensation unit and the power transmission unit by configuring the parameters, so as to construct the minimum coupling system through the T-type compensation unit and the power transmission unit; Step S3: Construct a modular, efficient, extended coupling system for wireless power supply based on at least two of the minimum coupling systems.

7. The construction method of the wireless power supply area modular high-efficiency extended coupling system as described in claim 6, characterized in that, Step S1 includes: Step S11: Obtain the structural parameters of the transmitting coil and the receiving coil, so as to obtain the self-inductance values ​​of the transmitting coil and the receiving coil based on the structural parameters; Step S12: In the dual-transmitter coil power supply mode, with the goal of minimizing the mutual inductance fluctuation between the transmitting coil and the receiving coil, determine the overlap distance between the transmitting coils; Step S13: Based on the principle that the values ​​of the transmit and receive mutual inductance remain consistent and maximized in single-transmitter coil power supply mode, dual-transmitter coil power supply mode and four-transmitter coil power supply mode, divide the power supply area for each power supply mode. Step S14: After determining the overlap distance of the transmitting coil and the power supply area of ​​each power supply mode, the self-inductance value of the decoupling coil is determined by simulation with the goal of minimizing the difference between the cross mutual inductance of the transmitting coil and the coupling mutual inductance of the decoupling coil. Step S15: Determine the passive component parameters in the T-type compensation unit based on the self-inductance values ​​of the transmitting coil and the receiving coil, the cross mutual inductance of the transmitting coil, the coupling mutual inductance and self-inductance value of the decoupling coil.

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