High-power multichannel wireless power transmission system and method

Abstract

The invention provides a high-power multichannel wireless electric energy transmission system and method, and relates to the technical field of electric energy transmission, and the system comprises a primary side circuit and a secondary side circuit. The primary side circuit comprises a DSP (Digital Signal Processor) which is respectively connected with the plurality of transmitting side circuits through a synchronous inversion controller; each transmitting side circuit comprises a direct-current power supply, an inverter and a transmitting side coupling coil which are sequentially connected in parallel; a transmitting side compensation capacitor is connected in series between the inverter and the transmitting side coupling coil; the secondary side circuit comprises a receiving side coupling coil, a step-down transformer, a rectifier bridge, a filter capacitor and a load which are sequentially connected in parallel; and a receiving side compensation capacitor is connected in series between the receiving side coupling coil and the step-down transformer. By adjusting the compensation capacitance of the transmitting side coil, the wireless electric energy transmission system can reach a resonance state, the energy transmission efficiency is greatly improved, and the system in the resonance state can reduce the loss of energy in the transmission process.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy transmission, and in particular to a high-power multi-channel wireless electric energy transmission system and method. Background Art

[0002] The high-power multi-channel wireless power transmission method is a technology that uses multiple independent wireless transmission channels to simultaneously provide power to devices. It is suitable for scenarios with high power requirements, such as electric vehicles, industrial equipment, etc. The multi-channel wireless power transmission system usually includes multiple transmitting coils and a single receiving coil. The transmitting side is equipped with an antenna or coil that can generate and transmit electromagnetic waves to transmit energy to a concentrated receiving area. The receiving side is equipped with a corresponding antenna or coil to capture the electromagnetic waves from each transmitting coil and convert them back into electrical energy. Transmission through multiple channels can improve the transmission efficiency and stability of the system and reduce the energy loss and heat accumulation that may be caused by a single channel.

[0003] The multi-channel wireless power transmission method is supplied by multiple energy sources and the transmitting coil and the receiving coil do not need to be physically connected. It can be deployed more flexibly in the physical space. Even if one of the transmitting coils fails or the efficiency decreases, it can still provide stable energy output. It allows the number of transmitting coils to be increased or decreased according to demand. It can adapt to different energy requirements from small devices to large facilities, and can meet the wireless power supply needs of high-power equipment such as electric vehicles and industrial equipment, solving the inconvenience of traditional wired power supply and the limitations of low-power wireless transmission.

[0004] However, the efficiency of current wireless power transmission methods is usually limited by the coupling efficiency and transmission distance of the electromagnetic field. The relative positions and distances between each transmitting coil and receiving coil are different, and the energy transmission efficiency is uneven. Due to the interference and superposition of electromagnetic waves in space, energy loss is caused. During the wireless power transmission process, excessive power causes the equipment to overheat, reducing the life and reliability of the components. The phase and frequency of each transmitting coil cannot be accurately controlled, resulting in low transmission efficiency. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art that the efficiency of the current wireless power transmission method is usually limited by the coupling efficiency and transmission distance of the electromagnetic field, the relative positions and distances between each transmitting coil and the receiving coil are different, the energy transmission efficiency is uneven, and the interference and superposition of electromagnetic waves in space cause energy loss. During the wireless power transmission process, excessive power causes the equipment to overheat, reduces the life and reliability of the components, and cannot accurately control the phase and frequency of each transmitting coil, resulting in too low transmission efficiency, the present invention provides a high-power multi-channel wireless power transmission system and method.

[0006] First aspect:

[0007] An embodiment of the present invention provides a high-power multi-channel wireless power transmission system, comprising: a primary circuit and a secondary circuit;

[0008] The primary side circuit includes a DSP connected to a plurality of transmitting side circuits respectively through a synchronous inverter controller;

[0009] Each transmitting side circuit includes a DC power supply, an inverter and a transmitting side coupling coil connected in parallel in sequence;

[0010] A transmitting side compensation capacitor is connected in series between the inverter and the transmitting side coupling coil;

[0011] The secondary circuit includes a receiving side coupling coil, a step-down transformer, a rectifier bridge, a filter capacitor and a load connected in parallel in sequence;

[0012] A receiving side compensation capacitor is connected in series between the receiving side coupling coil and the step-down transformer.

[0013] Second aspect:

[0014] A high-power multi-channel wireless power transmission method provided in an embodiment of the present invention is applied to the high-power multi-channel wireless power transmission system of the first aspect, comprising:

[0015] S1: Get the voltage to be transmitted;

[0016] S2: setting the output voltage of each DC power supply to the voltage to be transmitted;

[0017] S3: adjusting the compensation capacitance of each transmitting side coil and the spacing between two transmitting side coils, so that the high-power multi-channel wireless power transmission system reaches a resonant state and a current-sharing state;

[0018] S4: The voltage to be transmitted is transmitted through the adjusted high-power multi-channel wireless power transmission system.

[0019] The third aspect:

[0020] An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the high-power multi-channel wireless power transmission method according to the second aspect is implemented.

[0021] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0022] In the present invention, by adjusting the compensation capacitor of the transmitting side coil, the wireless power transmission system reaches a resonant state, greatly improving the energy transmission efficiency. The system in the resonant state can reduce the energy loss during the transmission process. By adjusting the spacing between the transmitting side coils, the system reaches a current-sharing state, preventing the system components from being damaged due to overload, ensuring that the receiving end obtains a stable energy supply, and adopting a step-down transformer and a rectifier bridge, the secondary circuit can adapt to different load requirements, optimizing the energy receiving efficiency and quality. The coupling coils of the primary circuit and the secondary circuit of the high-power multi-channel wireless power transmission system adopt a multi-to-one arrangement, and a step-down transformer is arranged on the receiving side. The current of the transmission wire before the step-down transformer on the receiving side is relatively low, reducing the heat generation, and can ensure low-voltage high-current output and high-power output while low-voltage input. The DSP and synchronous inverter controller can accurately control each transmitting side circuit to reach a resonant state and a current-sharing state, avoiding electrical accidents, improving the life of system components, and enhancing the transmission efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a high-power multi-channel wireless power transmission system provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of a flow chart of a high-power multi-channel wireless power transmission method provided by an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of a circuit for multi-channel wireless power transmission provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0028] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0029] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0030] Reference Manual Attached Figure 1 , showing a schematic structural diagram of a high-power multi-channel wireless power transmission system provided by an embodiment of the present invention.

[0031] An embodiment of the present invention provides a high-power multi-channel wireless power transmission system, comprising: a primary circuit and a secondary circuit;

[0032] The primary circuit includes a DSP1 connected to multiple transmitting side circuits respectively through a synchronous inverter controller 2; each transmitting side circuit includes a DC power supply 3, an inverter 4 and a transmitting side coupling coil 61 connected in parallel; a transmitting side compensation capacitor 5 is connected in series between the inverter 4 and the transmitting side coupling coil 61; the secondary circuit includes a receiving side coupling coil 62, a step-down transformer 8, a rectifier bridge 9, a filter capacitor 10 and a load 11 connected in parallel; a receiving side compensation capacitor 7 is connected in series between the receiving side coupling coil 62 and the step-down transformer 8.

[0033] In a possible implementation manner, the number of the transmitting-side coupling coils is four, and the number of the receiving-side coupling coils relative to the transmitting-side coupling coils is one.

[0034] In a possible implementation, the inverter is a silicon carbide inverter.

[0035] In a possible implementation, the primary side of the step-down transformer is connected in parallel with the receiving-side coupling coil.

[0036] The ratio of the primary voltage to the secondary voltage of the step-down transformer is 6:1.

[0037] In actual operation, the ratio of the primary voltage to the secondary voltage of the step-down transformer is determined according to the number of turns of the primary coil and the number of turns of the secondary coil of the step-down transformer:

[0038]

[0039] Among them, V1 represents the primary voltage of the step-down transformer, V2 represents the secondary voltage of the step-down transformer, N1 represents the number of turns of the primary coil of the step-down transformer, and N2 represents the number of turns of the secondary coil of the step-down transformer.

[0040] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0041] In the present invention, by adjusting the compensation capacitor of the transmitting side coil, the wireless power transmission system reaches a resonant state, greatly improving the energy transmission efficiency. The system in the resonant state can reduce the energy loss during the transmission process. By adjusting the spacing between the transmitting side coils, the system reaches a current-sharing state, preventing the system components from being damaged due to overload, ensuring that the receiving end obtains a stable energy supply, and adopting a step-down transformer and a rectifier bridge, the secondary circuit can adapt to different load requirements, optimizing the energy receiving efficiency and quality. The coupling coils of the primary circuit and the secondary circuit of the high-power multi-channel wireless power transmission system adopt a multi-to-one arrangement, and a step-down transformer is arranged on the receiving side. The current of the transmission wire before the step-down transformer on the receiving side is relatively low, reducing the heat generation, and can ensure low-voltage high-current output and high-power output while low-voltage input. The DSP and synchronous inverter controller can accurately control each transmitting side circuit to reach a resonant state and a current-sharing state, avoiding electrical accidents, improving the life of system components, and enhancing the transmission efficiency of the system.

[0042] Reference Manual Attached Figure 2 , showing a flow chart of a high-power multi-channel wireless power transmission method provided by an embodiment of the present invention.

[0043] A high-power multi-channel wireless power transmission method provided in an embodiment of the present invention is applied to the above-mentioned high-power multi-channel wireless power transmission system, comprising:

[0044] S1: Get the voltage to be transmitted.

[0045] S2: Set the output voltage of each DC power supply to the voltage to be transmitted.

[0046] Among them, the output voltage refers to the voltage value provided by the DC power supply, which is the basic parameter for the operation of the equipment. The voltage to be transmitted is the target voltage value that needs to be transmitted to the load during the wireless power transmission process. The DC power supply provides a power supply device with constant current and voltage, and the output current direction does not change with time.

[0047] It should be noted that setting the output voltage of each DC power supply to the voltage to be transmitted can ensure the uniformity of the output voltage during the power transmission process, avoid voltage mismatch between different channels, and thus improve the stability and efficiency of the system.

[0048] Reference Manual Attached Figure 3 , showing a circuit diagram of a multi-channel wireless power transmission provided by an embodiment of the present invention.

[0049] Figure 3In the present invention, multiple coils on the transmitting side transmit electric energy through an AC power supply and a compensation capacitor. Each transmitting coil generates an equivalent mutual inductance voltage source in the receiving coil, and transmits electric energy to the receiving coil through magnetic resonance. The receiving coil is connected to a load, thereby finally realizing wireless transmission and consumption of electric energy. Figure 3 Each transmitting coil in the system has an alternating current inside, which is transmitted to the large receiving coil via magnetic resonance radio energy, generating four equivalent voltage sources UM1r, UM2r, UM3r, and UM4r in the receiving coil. UM1r, UM2r, UM3r, and UM4r are the equivalent mutual inductance voltage sources of the first coil, the second coil, the third coil, and the fourth coil to the receiving coil, respectively. UMr1, UM21, UM31, and UM41 are the equivalent mutual inductance voltage sources generated by the receiving coil, the second coil, the third coil, and the fourth coil to the first coil, respectively.

[0050] S3: Adjust the compensation capacitance of each transmitting side coil and the spacing between two transmitting side coils, so that the high-power multi-channel wireless power transmission system reaches a resonant state and a current-sharing state.

[0051] Among them, the transmitting side coil is a coil used to send electromagnetic energy, located on the transmitting side of the wireless power transmission system. The compensation capacitor is used to form a resonant circuit together with the coil to compensate for the phase difference caused by the coil inductance, thereby improving the transmission efficiency of the system. The spacing distance between the two transmitting side coils refers to the physical distance between the transmitting side coils, which will affect the coupling strength between the coils and the current equalization effect. The resonant state is when the reactance generated by the inductance and capacitance of the circuit is equal, the entire circuit is in a resonant state, and the transmission efficiency is the highest. The current equalization state refers to the uniform current distribution of multiple coils to avoid uneven power transmission due to current imbalance.

[0052] In a possible implementation, S3 specifically includes:

[0053] S301: modulating the output voltage of each DC power supply through DSP to obtain a square wave signal of a preset resonant frequency.

[0054] Among them, DSP (digital signal processor) is a processor specially used for fast processing of digital signals. It has efficient and real-time processing capabilities and is used to modulate voltage signals. The preset resonant frequency is a fixed frequency set to achieve the resonant state of wireless power transmission, so that the system can work under optimal conditions. The square wave signal is a simple time domain signal. The voltage periodically switches between high and low values ​​and is often used to drive electronic devices such as inverters.

[0055] Specifically, by modulating the output voltage of the DC power supply through DSP, the frequency of the generated square wave signal can be accurately controlled to match the preset resonant frequency of the system, thereby ensuring that the system operates in the optimal resonant state and improving the efficiency and stability of power transmission.

[0056] It should be noted that those skilled in the art can set the preset resonant frequency according to actual needs, and the present invention does not limit this.

[0057] S302: Using a synchronous inverter controller, input a square wave signal to an inverter of a transmitting side circuit, and output a transmitting side alternating current.

[0058] Among them, the synchronous inverter controller is used to control the synchronous operation of multiple inverters so that they can convert direct current into alternating current at the same frequency and phase to ensure stable operation of the system. The transmitting side circuit is the power generation part of the wireless power transmission system, which is composed of a DC power supply, an inverter and a transmitting side coil. The inverter is a power electronic device that converts direct current into alternating current and is responsible for generating the alternating current required for transmission. The transmitting side alternating current is the alternating current output by the inverter, which is supplied to the transmitting side coupling coil for wireless power transmission.

[0059] It should be noted that by inputting a square wave signal into the inverter through a synchronous inverter controller, it is possible to ensure that multiple transmitting side circuits work synchronously and output consistent alternating current, thereby ensuring the efficiency and stability of multi-channel wireless power transmission.

[0060] S303: Transmitting the transmitting side alternating current to the receiving side coupling coil through the transmitting side coupling coil, and generating an equivalent mutual inductance voltage source of the transmitting side alternating current in the receiving side coupling coil.

[0061] Among them, the transmitting side coupling coil is a coil located in the transmitting side circuit, which is responsible for transmitting the alternating current to the receiving side by electromagnetic induction. The receiving side coupling coil is a coil located in the receiving side circuit, which receives the electromagnetic energy from the transmitting side coil and generates an induced voltage. The equivalent mutual inductance voltage source is a voltage source induced in the receiving side coil due to the electromagnetic mutual inductance between the transmitting side and receiving side coupling coils, which corresponds to the alternating current on the transmitting side.

[0062] In a possible implementation manner, S303 specifically includes:

[0063] The magnetic resonance wireless power transmission method is used to transmit the AC power through the transmitting side coupling coil to the receiving side coupling coil to generate an equivalent voltage source, that is, an equivalent mutual inductance voltage source.

[0064] Among them, the induced voltage source generated by the coupling coil on the receiving side of the equivalent voltage source through electromagnetic induction is equivalent to the energy transmission on the transmitting side.

[0065] It should be noted that by transmitting alternating current to the receiving coil through the coupling coil on the transmitting side and generating an equivalent mutual inductance voltage source based on electromagnetic induction, efficient wireless power transmission can be achieved without the need for physical wire connections, reducing the complexity and loss of the system, ensuring contactless transmission of energy, and improving the flexibility and reliability of the system, making it suitable for a variety of application scenarios.

[0066] S304: In a high-power multi-channel wireless power transmission system with an equivalent mutual inductance voltage source, measuring an inductance value of a coupling coil on a transmitting side and an inductance value of a coupling coil on a receiving side.

[0067] Among them, the inductance value represents the ability of the coil to store magnetic field energy, which affects the resonant frequency and energy transmission efficiency of the circuit.

[0068] In a possible implementation manner, S304 specifically includes:

[0069] The inductance of the transmitting side coupling coil and the receiving side coupling coil is measured by using an inductance measuring instrument to determine the inductance value of the transmitting side coupling coil and the inductance value of the receiving side coupling coil.

[0070] It should be noted that by measuring the inductance of the coupled coils on the transmitting and receiving sides, the resonant state of the system can be accurately adjusted to optimize the efficiency of wireless power transmission. Understanding the inductance value can also help match the appropriate compensation capacitor to ensure that the system operates at the optimal operating frequency, reduce losses, improve system stability, and avoid problems such as overheating or uneven current distribution.

[0071] S305: Based on the inductance value of the transmitting-side coupling coil and the inductance value of the receiving-side coupling coil, matching is performed so that the transmitting-side coupling coil satisfies a target capacitance that satisfies a resonance condition.

[0072] Among them, the resonance condition is that when the system is in resonance, the reactance of the inductor and capacitor are equal, so that the circuit can efficiently transmit energy with minimum loss. The target capacitance is the capacitance value required for the system to reach the resonant state, and together with the inductor value, it determines the resonant frequency.

[0073] In a possible implementation manner, S305 specifically includes:

[0074] S305A: Calculate the capacitance value that satisfies the resonance condition of the transmitting side coupling coil:

[0075]

[0076] Wherein, C represents the capacitance value that makes the transmitting side coupling coil meet the resonance condition, π represents pi, f represents the resonance frequency, and L represents the inductance value of the transmitting side coupling coil.

[0077] S305B: Match the target capacitance according to the capacitance value.

[0078] It should be noted that by matching the appropriate target capacitance so that the transmitting-side coupling coil meets the resonance condition, the wireless power transmission efficiency can be greatly improved and energy loss can be reduced. In the resonant state, the system can transmit high power with the lowest energy loss, and the current and voltage waveforms are more stable, ensuring the efficient and reliable operation of the entire multi-channel system.

[0079] S306: Connecting a first preset voltage to the high-power multi-channel wireless power transmission system after matching the target capacitance, and measuring a voltage waveform and a current waveform of the transmitting-side coupling coil.

[0080] The voltage waveform and the current waveform represent the changes of the voltage and current in the coupling coil on the transmitting side over time, and are used to analyze whether the system is working normally.

[0081] In a possible implementation, S306 specifically involves using a voltage measuring instrument and a current measuring instrument to measure the voltage waveform and the current waveform of the transmitting-side coupling coil respectively.

[0082] It should be noted that those skilled in the art can set the magnitude of the first preset voltage according to actual needs, and the present invention is not limited thereto. Specifically, the first preset voltage is a low voltage.

[0083] Specifically, by connecting the preset voltage in the system after matching the capacitors and measuring the voltage and current waveforms of the transmitting side coil, it is possible to effectively detect whether the system is in a resonant state. Analyzing the waveform can verify whether the resonance adjustment is successful and help discover potential problems such as uneven current or voltage distortion.

[0084] S307: judging whether the transmitting-side coupling coils have reached the resonant state and the current-sharing state according to the voltage waveform and the current waveform; if so, proceeding to step S309; ​​otherwise, proceeding to step S308.

[0085] It should be noted that by analyzing the voltage waveform and current waveform, it is possible to determine whether the transmitting side coupling coil has reached the resonant state and the current equalization state, and to detect the operating status of the system in real time to ensure that each transmitting side coil is working in the best state. If deviation from resonance or uneven current is found, timely adjustments can be made to avoid power loss or equipment overheating.

[0086] S308: When the transmitting side coupling coil is in a non-resonant state, the transmitting side compensation capacitor with the largest resonance deviation is adjusted to make the transmitting side coupling coil reach a balanced state. When the transmitting side coupling coil is in a non-current-equalizing state, the spacing distance is adjusted to make the transmitting side coupling coil reach a current-equalizing state.

[0087] It should be noted that by adjusting the compensation capacitor with the largest resonance deviation, the resonance state of the transmitting side coil can be effectively corrected to return it to an efficient transmission state, and the spacing between the coils can be adjusted to achieve a current-sharing state, ensuring that each coil evenly distributes current.

[0088] S309: Determine whether the transmitting-side coupling coils have reached a resonant state and a current-sharing state. If so, proceed to S310; otherwise, return to step S306.

[0089] S310: End adjustment of the high-power multi-channel wireless power transmission system.

[0090] It should be noted that by adjusting the spacing between the compensation capacitor and the transmitting side coil so that the system reaches resonance and current balancing, the efficiency of power transmission can be significantly improved, power loss can be reduced, and current distribution in multiple channels can be balanced, thereby improving the stability and overall performance of the system. The current balancing state helps to extend the life of system components and prevent local overload.

[0091] S4: The voltage to be transmitted is transmitted through the adjusted high-power multi-channel wireless power transmission system.

[0092] It should be noted that by adjusting the voltage of the high-power multi-channel wireless power transmission system, efficient power transmission can be ensured under resonance and current sharing conditions. The adjusted system can minimize energy loss, improve power transmission efficiency, ensure the stability and reliability of multiple channels, and balanced current distribution can also avoid local overheating or equipment overload problems, extend the service life of the system, and adapt to the needs of high-power transmission.

[0093] For example, a 4-to-1 topology structure can be set up with four small transmitting coils and a single large receiving coil. When the input voltage is 30V, the DC power supply of each transmitting coil is set to output 30V. The circuit is simulated by Simulink of MATLAB to determine that the voltage at both ends of each transmitting coupling coil is 30V, and the voltage at both ends of the receiving coupling coil is 180V. According to the simulation results, a step-down transformer with a ratio of primary voltage to secondary voltage of 6:1 is set. The 30V input voltage is input into the adjusted high-power multi-channel wireless power transmission, which can stably ensure that the output voltage is maintained at 30±2V, the output power is ≥3kW, the primary-secondary transmission distance is ≥10cm, and the equivalent load output current is stable at 100A. The reasonable use of the transformer solves the problem of how to ensure low-voltage high-current output and high-power output at the same time as low-voltage input. At the same time, the current of the transmission wire before the step-down transformer on the receiving side is relatively low, which reduces the generation of heat.

[0094] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0095] In the present invention, by adjusting the compensation capacitor of the transmitting side coil, the wireless power transmission system reaches a resonant state, greatly improving the energy transmission efficiency. The system in the resonant state can reduce the energy loss during the transmission process. By adjusting the spacing between the transmitting side coils, the system reaches a current-sharing state, preventing the system components from being damaged due to overload, ensuring that the receiving end obtains a stable energy supply, and adopting a step-down transformer and a rectifier bridge, the secondary circuit can adapt to different load requirements, optimizing the energy receiving efficiency and quality. The coupling coils of the primary circuit and the secondary circuit of the high-power multi-channel wireless power transmission system adopt a multi-to-one arrangement, and a step-down transformer is arranged on the receiving side. The current of the transmission wire before the step-down transformer on the receiving side is relatively low, reducing the heat generation, and can ensure low-voltage high-current output and high-power output while low-voltage input. The DSP and synchronous inverter controller can accurately control each transmitting side circuit to reach a resonant state and a current-sharing state, avoiding electrical accidents, improving the life of system components, and enhancing the transmission efficiency of the system.

[0096] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0097] In the present invention, by adjusting the compensation capacitor of the transmitting side coil, the wireless power transmission system reaches a resonant state, greatly improving the energy transmission efficiency. The system in the resonant state can reduce the energy loss during the transmission process. By adjusting the spacing between the transmitting side coils, the system reaches a current-sharing state, preventing the system components from being damaged due to overload, ensuring that the receiving end obtains a stable energy supply, and adopting a step-down transformer and a rectifier bridge, the secondary circuit can adapt to different load requirements, optimizing the energy receiving efficiency and quality. The coupling coils of the primary circuit and the secondary circuit of the high-power multi-channel wireless power transmission system adopt a multi-to-one arrangement, and a step-down transformer is arranged on the receiving side. The current of the transmission wire before the step-down transformer on the receiving side is relatively low, reducing the heat generation, and can ensure low-voltage high-current output and high-power output while low-voltage input. The DSP and synchronous inverter controller can accurately control each transmitting side circuit to reach a resonant state and a current-sharing state, avoiding electrical accidents, improving the life of system components, and enhancing the transmission efficiency of the system.

[0098] It should be understood that the processor in the embodiment of the present invention may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0099] It should also be understood that the memory in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0100] The above embodiments can be implemented in whole or in part by software, hardware (such as circuits), firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When a computer instruction or computer program is loaded or executed on a computer, a process or function according to an embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. Computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state hard disk.

[0101] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0102] In the present invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0103] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0104] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0105] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described equipment, devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0106] In the several embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0107] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0108] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0109] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0110] An embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, a high-power multi-channel wireless power transmission method as described in the method embodiment is implemented.

[0111] A computer-readable storage medium provided by the present invention can implement the steps and effects of the high-power multi-channel wireless power transmission method of the above method embodiment. To avoid repetition, the present invention will not go into details.

[0112] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0113] In the present invention, by adjusting the compensation capacitor of the transmitting side coil, the wireless power transmission system reaches a resonant state, greatly improving the energy transmission efficiency. The system in the resonant state can reduce the energy loss during the transmission process. By adjusting the spacing between the transmitting side coils, the system reaches a current-sharing state, preventing the system components from being damaged due to overload, ensuring that the receiving end obtains a stable energy supply, and adopting a step-down transformer and a rectifier bridge, the secondary circuit can adapt to different load requirements, optimizing the energy receiving efficiency and quality. The coupling coils of the primary circuit and the secondary circuit of the high-power multi-channel wireless power transmission system adopt a multi-to-one arrangement, and a step-down transformer is arranged on the receiving side. The current of the transmission wire before the step-down transformer on the receiving side is relatively low, reducing the heat generation, and can ensure low-voltage high-current output and high-power output while low-voltage input. The DSP and synchronous inverter controller can accurately control each transmitting side circuit to reach a resonant state and a current-sharing state, avoiding electrical accidents, improving the life of system components, and enhancing the transmission efficiency of the system.

[0114] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0115] There are a few points to note:

[0116] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention, and other structures may refer to the general design.

[0117] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of the layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0118] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0119] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A high-power multi-channel wireless power transmission system, characterized in that: include: Primary circuit and secondary circuit; The primary circuit comprises a DSP (1) connected to a plurality of transmitting circuits respectively through a synchronous inverter controller (2); Each transmitting side circuit comprises a DC power supply (3), an inverter (4) and a transmitting side coupling coil (61) which are sequentially connected in parallel; A transmitting side compensation capacitor (5) is connected in series between the inverter (4) and the transmitting side coupling coil (61); The secondary circuit comprises a receiving side coupling coil (62), a step-down transformer (8), a rectifier bridge (9), a filter capacitor (10) and a load (11) which are sequentially connected in parallel; A receiving-side compensation capacitor (7) is connected in series between the receiving-side coupling coil (62) and the step-down transformer (8).

2. The high-power multi-channel wireless power transmission system according to claim 1, characterized in that: The number of the transmitting-side coupling coils is 4, and the number of the receiving-side coupling coils relative to the transmitting-side coupling coils is 1.

3. The high-power multi-channel wireless power transmission system according to claim 1, characterized in that: The inverter is a silicon carbide inverter.

4. The high-power multi-channel wireless power transmission system according to claim 1, characterized in that: The primary side of the step-down transformer is connected in parallel with the receiving-side coupling coil; The ratio of the primary voltage to the secondary voltage of the step-down transformer is 6:

1.

5. A high-power multi-channel wireless power transmission method, characterized in that: The high-power multi-channel wireless power transmission system according to any one of claims 1 to 4 comprises: S1: Get the voltage to be transmitted; S2: setting the output voltage of each DC power supply to the voltage to be transmitted; S3: adjusting the compensation capacitance of each transmitting side coil and the spacing between two transmitting side coils, so that the high-power multi-channel wireless power transmission system reaches a resonant state and a current-sharing state; S4: Transmitting the voltage to be transmitted through the adjusted high-power multi-channel wireless power transmission system.

6. The high-power multi-channel wireless power transmission method according to claim 5, characterized in that: The S3 specifically includes: S301: modulating the output voltage of each DC power supply through DSP to obtain a square wave signal of a preset resonant frequency; S302: using the synchronous inverter controller, inputting the square wave signal into the inverter of the transmitting side circuit to output transmitting side alternating current; S303: transmitting the transmitting-side alternating current to the receiving-side coupling coil through the transmitting-side coupling coil, and generating an equivalent mutual inductance voltage source with respect to the transmitting-side alternating current in the receiving-side coupling coil; S304: In the high-power multi-channel wireless power transmission system having the equivalent mutual inductance voltage source, measuring the inductance value of the coupling coil on the transmitting side and the inductance value of the coupling coil on the receiving side; S305: Based on the inductance value of the transmitting side coupling coil and the inductance value of the receiving side coupling coil, matching a target capacitance so that the transmitting side coupling coil meets a resonance condition; S306: connecting a first preset voltage to the high-power multi-channel wireless power transmission system after matching the target capacitance, and measuring a voltage waveform and a current waveform of the transmitting-side coupling coil; S307: judging whether the transmitting-side coupling coils have reached the resonant state and the current-sharing state according to the voltage waveform and the current waveform; if so, proceeding to step S309; ​​otherwise, proceeding to step S308; S308: When the transmitting side coupling coil is in a non-resonant state, the transmitting side compensation capacitor with the largest resonance deviation is adjusted to make the transmitting side coupling coil reach a balanced state; when the transmitting side coupling coil is in a non-current-sharing state, the spacing distance is adjusted to make the transmitting side coupling coil reach a current-sharing state; S309: Determine whether the transmitting-side coupling coils have reached the resonant state and the current-sharing state. If so, proceed to S310; otherwise, return to step S306; S310: End the adjustment of the high-power multi-channel wireless power transmission system.

7. The high-power multi-channel wireless power transmission method according to claim 6, characterized in that: The S303 is specifically: The AC power is transmitted to the receiving side coupling coil through the transmitting side coupling coil by using a magnetic resonance wireless power transmission method, so as to generate an equivalent voltage source, namely, the equivalent mutual inductance voltage source.

8. The high-power multi-channel wireless power transmission method according to claim 6, characterized in that: The S304 is specifically as follows: The inductance of the transmitting side coupling coil and the receiving side coupling coil is measured by using an inductance measuring instrument to determine the inductance value of the transmitting side coupling coil and the inductance value of the receiving side coupling coil.

9. The high-power multi-channel wireless power transmission method according to claim 6, characterized in that: The S305 specifically includes: S305A: Calculate the capacitance value that enables the transmitting-side coupling coil to meet the resonance condition: Wherein, C represents the capacitance value that makes the transmitting side coupling coil meet the resonance condition, π represents pi, f represents the resonance frequency, and L represents the inductance value of the transmitting side coupling coil; S305B: Match the target capacitance according to the capacitance value.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the high-power multi-channel wireless power transmission method according to any one of claims 5 to 9 is implemented.

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