Single load wireless power transfer system with single transmit dual receive coil and method thereof

Abstract

The application discloses a single-load wireless power transmission system with a single transmitting and double receiving coil and a method thereof, the system comprising a direct-current power supply, a high-frequency inverter, a transmitting end compensation topology module, a transmitting coil module, two receiving coil modules, two receiving end compensation topology modules, a rectifying module, a filtering capacitor and a system load module; the topology structure adopts S-LC and S-LCC compensation topologies, and a method for optimizing the parameters of the topology structure is given, so that the anti-deviation characteristics of the system are effectively improved. The optimized system can realize the stability of the system output power under the deviation and load change conditions within a certain range. The system of the application reduces the cost of the system, the method of the application can realize strong anti-deviation capability, the output power is stable, and the system overall efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of radio technology, and particularly relates to a single-load wireless power transmission system with single transmission and double reception coils and a method thereof. BACKGROUND

[0002] In the wireless power transmission technology, a magnetic field coupling wireless power transmission (MFC-WPT) system can realize relatively high-efficiency and stable energy transmission at a medium distance, and can avoid problems such as cable binding and contact wear caused by traditional wired charging, and has become an ideal choice for realizing wireless power supply of devices in many fields, and has shown a broad application prospect in the fields of smart home, intelligent transportation, intelligent medical treatment and underwater unmanned equipment.

[0003] However, the performance of the MFC-WPT system in the actual application scene is restricted by a key factor, i.e., the offset problem. In the intelligent and autonomous device operation environment, the relative positions between the transmission end and the reception end are often in a dynamic change state. In the smart home scene, the positions of the movable intelligent electrical appliances are difficult to fix in daily use. In the intelligent transportation field, the vehicles will generate displacement in the use process. In the intelligent medical treatment field, the implantable medical devices will change positions along with the activities of the human body. In the underwater unmanned equipment environment, the equipment is easily affected by environmental factors such as the degree of turbulent flow of water, the change of water temperature, the fluctuation of water pressure and the reaction force generated by the working of the propeller of the equipment itself, and the positions of the equipment are easily offset. These conditions will cause the offset problem between the coils of the MFC-WPT system, and then seriously affect the coupling state between the coils, so that the coupling coefficient is significantly changed, the output power of the system fluctuates greatly, and the overall efficiency of the system is low. In the prior art, the constant output of power is usually realized by a control means, but the cost of the system is increased. SUMMARY

[0004] The present application aims to provide a single-load wireless power transmission system with single transmission and double reception coils and a method thereof, which can realize the constant output of power, improve the overall efficiency of the system, and is low in cost.

[0005] To achieve the above object, the single-load wireless power transmission system with single transmission and double reception coils comprises a DC power supply, a high-frequency inverter, a transmission end compensation topology module, a transmission coil module, two reception coil modules, two reception end compensation topology modules, a rectifier module, a filter capacitor and a system load module; the DC power supply is connected with the input end of the high-frequency inverter, the output end of the high-frequency inverter is connected with the input end of the transmission end compensation topology module, the output end of the transmission end compensation topology module is connected with the input end of the transmission coil module, the output end of the transmission coil module is opposite to the input end of the two reception coil modules, the output end of the two reception coil modules is connected with the input end of the two reception end compensation topology modules, the output end of the two reception end compensation topology modules is connected with the input end of the rectifier module in parallel, and the output end of the rectifier module is connected with the filter capacitor and the system load module.

[0006] As a further scheme of the application, the transmission end compensation topology module comprises a compensation capacitor C1, the transmission coil module comprises a transmission end coil self-inductance L1, the compensation capacitor C1 and the transmission end coil self-inductance L1 form an S topology, one of the reception end compensation topology modules comprises a compensation capacitor C2 and a compensation inductance Ls to form an LC topology, the other of the reception end compensation topology modules comprises a compensation capacitor C3, a compensation capacitor C4 and a compensation inductance L4 to form an LCC topology, the reception coil module comprises a reception end coil self-inductance L2 and a reception end coil self-inductance L3, the mutual inductance between the transmission end coil and the reception end coil is M12 and M13 respectively, the S topology and the LC topology form an S-LC compensation topology, and the S topology and the LCC topology form an S-LCC compensation topology.

[0007] As a further scheme of the application, the mutual inductance M 23 between the reception end coil self-inductance L2 and the reception end coil self-inductance L3 is zero, and the two reception end coils adopt an overlapping rectangular coil structure.

[0008] As a further scheme of the application, the high-frequency inverter is composed of MOSFETS S1-S4, MOSFETS S1 and MOSFETS S3 are connected in series, and then MOSFETS S2 and MOSFETS S4 connected in series are connected in parallel, the rectifier module is a full-bridge rectifier circuit composed of diodes D1-D4, and the filter capacitor and the system load module are composed of a filter capacitor C e and a load R L connected in parallel.

[0009] A method for a single-load wireless power transmission system with single transmission and double reception coils comprises an anti-offset method, and specifically comprises the following steps.

[0010] Step one: determining the equivalent load R eq of the system and the system resonance condition:

[0011] Req = 8R L / π 2 (1)

[0012] wherein R L is the load of the system,

[0013] The compensation parameters of the system satisfy the condition shown in equation (2):

[0014]

[0015] wherein ω is the resonant angular frequency of the system;

[0016] Step two, build a mathematical model, to find the output power, compensation inductance L S and the relationship between the compensation inductance L4 and the mutual inductance between the coils, according to Kirchhoff's voltage, current law can be listed as shown in equation (3) matrix equation:

[0017]

[0018] wherein j represents the imaginary,

[0019] According to equation (2) to solve equation (3), the LCC topology output current I4, LC topology output current I5 as shown in equation (4) is solved out:

[0020]

[0021] The system output current I R and the output power P O as shown in equation (5) and equation (6):

[0022] I R = I4+I5 (5)

[0023] P O = I R (I R ) * R eq (6)

[0024] Step three, from equation (4) to (6), by adjusting the compensation inductance L S and the value of the compensation inductance L4, so that in the offset case to maintain the output power of the system constant; according to the mutual inductance value M 12 and M 13 , through the non dominated particle swarm optimization algorithm, the value of the compensation inductance L S and the compensation inductance L4 is calculated.

[0025] As a further scheme of the present application: further comprising calculating the output power characteristics of the S-LC compensation topology and the S-LCC compensation topology, specifically comprising the following steps:

[0026] Step one, according to the equivalent circuit of S-LC and S-LCC compensation topology, respectively build S-LC compensation topology mathematical model, S-LCC compensation topology mathematical model;

[0027] Step two: calculate the relationship between the output power and mutual inductance of S-LC compensation topology, the resonance condition of its topology is shown in equation (7):

[0028] ω 2 L1C1=ω 2 L2C2=ω 2 L S C2=1 (7)

[0029] Build the mathematical model of the topology as shown in equation (8):

[0030]

[0031] Among them,

[0032] According to equation (7) to solve equation (8), the output current I5 and the output power P O1 As shown in equation (9) and equation (10):

[0033]

[0034] P O1 =I5(I5) * R eq (10)

[0035] From equation (9) and equation (10), the output power and current of S-LC compensation topology are inversely proportional to the mutual inductance between the coils;

[0036] Step three, calculate the relationship between the output power and mutual inductance of S-LCC compensation topology, the resonance condition of its topology is shown in equation (11):

[0037] ω 2 L1C1=ω 2 (L3-L4)C3=ω 2 L4C4=1 (11)

[0038] Build the mathematical model of the topology as shown in equation (12):

[0039]

[0040] Among them,

[0041] According to formula (11) to formula (12), the output current I4 and the output power P are solved O2 As shown in formula (13) and formula (14):

[0042]

[0043] P O2 =I4(I4) * R eq (14)

[0044] From formula (13) and formula (14), it is obtained that the current and the output power of the S-LCC compensation topology are inversely proportional to the mutual inductance between the coil.

[0045] As a further scheme of the application: the non-dominated particle swarm optimization algorithm realizes the target of minimum output power fluctuation and high system efficiency, and comprises the following steps:

[0046] Step one, input parameter definition, the mutual inductance value M 12 and M 13 are defined, the output power corresponding to the mutual inductance value when the coil is directly opposite is set as the initial power, the compensation inductance L S and the search range of the compensation inductance L4 and the algorithm parameters are set;

[0047] Step two, particle swarm initialization and external archive initialization, particles are randomly generated, and the target of high efficiency is converted into a minimum problem by adding a negative sign;

[0048] Step three, iteration is started according to the set iteration number, particle speed and position are updated, the new position is evaluated, the individual optimum is updated, and the external archive is updated;

[0049] Step four, according to the weight of the two targets, the weight is 6:4, the final solution is selected.

[0050] Compared with the prior art, the application improves the system topology structure, utilizes the transmission end compensation topology module, two receiving coil modules, two receiving end compensation topology modules, optimizes the parameters of the compensation capacitor and the compensation inductance by using the non-dominated particle swarm optimization algorithm, reduces the cost of the system, can realize strong anti-offset capability, the output power is stable, and the system overall efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 It is the circuit diagram of the single-transmitting multi-receiving single-load anti-offset wireless power transmission system based on the application.

[0052] Figure 2is a structure diagram of a transmitting coil and a receiving coil in the application.

[0053] Figure 3 is an S-LC compensation topology equivalent circuit diagram in the application.

[0054] Figure 4 is an S-LCC compensation topology equivalent circuit diagram in the application.

[0055] Figure 5 is a mutual inductance change characteristic diagram under coil offset in the application.

[0056] Figure 6 is a non-dominated particle swarm optimization algorithm parameter optimization flowchart in the application.

[0057] Figure 7 is a system output power diagram when the load resistance is 25Ω and 50Ω in the application.

[0058] Figure 8 is a system efficiency diagram when the load resistance is 25Ω and 50Ω in the application.

[0059] In the figure: 1, DC power supply, 2, high-frequency inverter, 3, transmitting end compensation topology module, 4, transmitting coil module, 5, receiving coil module, 6, receiving end compensation topology module, 7, rectifier module, 8, filter capacitor and system load module. DETAILED DESCRIPTION

[0060] The application will be further described below in combination with the drawings.

[0061] As Figure 1 shown, a single-transmitting double-receiving coil single-load wireless power transmission system includes a DC power supply 1, a high-frequency inverter 2, a transmitting end compensation topology module 3, a transmitting coil module 4, two receiving coil modules 5, two receiving end compensation topology modules 6, a rectifier module 7, a filter capacitor and system load module 8; the DC power supply 1 is connected with the input end of the high-frequency inverter 2, the output end of the high-frequency inverter 2 is connected with the input end of the transmitting end compensation topology module 3, the output end of the transmitting end compensation topology module 3 is connected with the input end of the transmitting coil module 4, the output end of the transmitting coil module 4 is opposite to the input end of the two receiving coil modules 5, the output end of the two receiving coil modules 5 is connected with the input end of the two receiving end compensation topology modules 6, the output end of the two receiving end compensation topology modules 6 is connected with the input end of the rectifier module 7 in parallel, and the output end of the rectifier module 7 is connected with the filter capacitor and system load module 8.

[0062] The transmitting end compensation topology module 3 comprises a compensation capacitor C1, the transmitting coil module 4 comprises a transmitting end coil self-inductance L1, the compensation capacitor C1 and the transmitting end coil self-inductance L1 form an S topology; one of the receiving end compensation topology modules 6 comprises an LC topology formed by a compensation capacitor C2 and a compensation inductor Ls, and the other receiving end compensation topology module 6 comprises an LCC topology formed by a compensation capacitor C3, a compensation capacitor C4 and a compensation inductor L4; the receiving coil module 5 comprises a receiving end coil self-inductance L2 and a receiving end coil self-inductance L3, the mutual inductances between the transmitting end coil and the receiving end coil are M12 and M13 respectively; the S topology and the LC topology form an S-LC compensation topology, and the S topology and the LCC topology form an S-LCC compensation topology; as the degree of offset between the transmitting end coil and the receiving end coil increases, the mutual inductance M12 shows a decreasing trend, and the mutual inductance M13 shows an increasing trend; at this time, the output powers of the S-LC and S-LCC compensation topologies are reduced with the increase of the mutual inductance. Therefore, according to the above characteristics, smaller output power fluctuation can be realized by optimizing the compensation parameters of the topologies, and the anti-offset capability of the system can be enhanced.

[0063] As shown in Figure 2 , in order to make the currents on both sides of the receiving end of the system not affect each other and reduce the complexity of system control, the mutual inductance M 23 between the receiving end coil self-inductance L2 and the receiving end coil self-inductance L3 needs to be zero. In the present application, the two receiving end coils in the receiving coil module 5 adopt an overlapping rectangular coil structure to eliminate the cross coupling between the coils, and the relative positions of the two coils when the mutual inductance is zero are simulated by Maxwell software.

[0064] The high-frequency inverter 2 is composed of MOSFETS S1-S4, wherein MOSFETS S1 is connected in series with MOSFETS S3, and then connected in parallel with MOSFETS S2 and MOSFETS S4 connected in series; the rectifier module 7 is a full-bridge rectifier circuit composed of diodes D1-D4, and the filter capacitor and the system load module 8 are composed of a filter capacitor C e and a load R L connected in parallel.

[0065] A method for anti-offset of a single-transmitting and double-receiving coil single-load wireless power transmission system, comprising the following steps:

[0066] Step one: determining the equivalent load R eq of the system and the system resonance condition:

[0067] R eq = 8R L / π 2 (1)

[0068] Wherein R L is the load of the system,

[0069] The compensation parameters of the system satisfy the condition shown in equation (2):

[0070]

[0071] Where ω is the resonant angular frequency of the system.

[0072] Step two, build a mathematical model, and calculate the output power, compensation inductance L S and the relationship between the compensation inductance L4 and the mutual inductance between the coils. When the system deviates, the mutual inductance between the coupling mechanisms changes, but the mutual inductance M 23 is almost zero and can be ignored. According to the Kirchhoff voltage and current law, the matrix equation is shown in equation (3):

[0073]

[0074] Where: j represents an imaginary number,

[0075] According to equation (2), solve equation (3) to solve the LCC topology output current I4 and the LC topology output current I5 as shown in equation (4):

[0076]

[0077] The system output current I R and the output power P O are shown in equations (5) and (6):

[0078] I R = I4+I5 (5)

[0079] P O = I R (I R ) * R eq (6)

[0080] Step three, from equations (4)-(6), by adjusting the values of the compensation inductance L S and the compensation inductance L4, the output power of the system is kept constant under the deviation condition. According to the mutual inductance values M 12 and M 13 calculated by simulation, the values of the compensation inductance L S and the compensation inductance L4 are calculated by the non-dominated particle swarm optimization algorithm.

[0081] The output power characteristics of the S-LC compensation topology and the S-LCC compensation topology are calculated, including the following steps:

[0082] Step one, according to the equivalent circuits of the S-LC and S-LCC compensation topologies, as shown inFigure 3 、 Figure 4 The S-LC compensation topology mathematical model and the S-LCC compensation topology mathematical model are respectively built as shown in the following formula (7) and formula (8):

[0083] Step two: the relationship between the output power of the S-LC compensation topology and mutual inductance is calculated, and the resonance condition of the topology is shown in formula (7):

[0084] ω 2 L1C1=ω 2 L2C2=ω 2 L S C2=1 (7)

[0085] The mathematical model of the compensation topology is shown in formula (8):

[0086]

[0087] Wherein,

[0088] According to formula (7) to solve formula (8), the output current I5 and the output power P O1 As shown in formula (9) and formula (10):

[0089]

[0090] P O1 =I5(I5) * R eq (10)

[0091] It can be seen from formula (9) and formula (10) that the output power and current of the S-LC compensation topology are inversely proportional to the mutual inductance between the coils.

[0092] Step three, the relationship between the output power of the S-LCC compensation topology and mutual inductance is calculated, and the resonance condition of the topology is shown in formula (11):

[0093] ω 2 L1C1=ω 2 (L3-L4)C3=ω 2 L4C4=1 (11)

[0094] The mathematical model of the compensation topology is shown in formula (12):

[0095]

[0096] Wherein,

[0097] According to formula (11) to solve formula (12), the output current I4 and the output power P O2As shown in formula (13) and formula (14):

[0098]

[0099] P O2 = I4(I4) * R eq (14)

[0100] It can be seen from formula (13) and formula (14) that the current and output power of the S-LCC compensation topology are inversely proportional to the mutual inductance between the coils.

[0101] Through the above calculation, it is found that the output power characteristics of the S-LC compensation topology and the S-LCC compensation topology are reduced with the increase of the mutual inductance.

[0102] Optimize the compensation inductance L S and the value of the compensation inductance L4 to achieve the purpose of minimizing the output power fluctuation and high system efficiency. The non-dominated particle swarm optimization algorithm is selected for the system. The non-dominated particle swarm optimization algorithm is used for multi-objective optimization problem algorithm, as shown in formula (15), which specifically includes the following steps: Figure 6

[0103] Step one, input parameter definition, define the mutual inductance value M 12 and M 13 output by simulation, set the output power corresponding to the mutual inductance value when the coil is directly opposite as the initial power, and set the search range and algorithm parameters of the compensation inductance L S and the compensation inductance L4.

[0104] Step two, particle swarm initialization and external archive initialization, randomly generate particles, and convert the high-efficiency target into a minimization problem by adding a negative sign.

[0105] Step three, start iteration according to the set iteration number, update particle speed and position, evaluate new position, update individual optimum, and update external archive.

[0106] Step four, according to the weight of the two targets, the weight is 6:4, select the final solution.

[0107] Embodiment:

[0108] The system input voltage V in is 111V, the driving frequency f is 85kHz, the compensation capacitor C1 of the transmitting end is 18.76nF, the compensation capacitor C2 of the secondary side is 26.76nF, the compensation capacitor C3 is 53.64nF, and the compensation capacitor C4 is 53.41nF; the compensation inductance L S is 75.86μH, the compensation inductance L4 is 65.64μH; the filter capacitor Ce is 22μF; and the system load R L ​The current ratings are 25Ω and 50Ω.

[0109] The structure diagram of the coil is as follows Figure 2 As shown, the specific parameters are as follows: the transmitting coil is 510mm long and 300mm wide, the Litz wire diameter is 2mm, the number of turns is 12, and the self-inductance L1 of the coil is 186.85μH. The two receiving coils on the secondary side use coils of the same specifications. The receiving coil is 300mm long and 300mm wide, the Litz wire diameter is 2mm, the number of turns is 12, and the self-inductances L2 and L3 of both receiving coils are 131μH. The distance between the transmitting and receiving coils is 130mm. To improve the mutual inductance between the transmitting and receiving coils, a magnetic core is added to the coil structure. Figure 5 This is a diagram showing the change in mutual inductance of the coil after the addition of a magnetic core and subsequent deflection.

[0110] Simulation tests were conducted based on the parameters designed above. Figure 7 For system load R L Output power diagrams for 25Ω and 50Ω resistors under system offset conditions, and system efficiency as shown below. Figure 8 As shown in the figure. Simulation results show that with a 20% lateral coil offset between the transmitting coil and the two receiving coils, the system's output power fluctuation is within 6%, and the overall system efficiency is over 90%.

Claims

1. A method for a single-transmitter, dual-receiver coil, single-load wireless power transmission system, including an anti-offset method, specifically comprising the following steps: Step 1: Determine the equivalent load of the system R eq Resonance condition of the system: （1） ； in R L For the system load, The system's compensation parameters satisfy the conditions shown in equation (2): （2）; in ω This is the resonant angular frequency of the system; Step two: Build a mathematical model and calculate the output power and compensation inductance. L S and compensating inductor L 4. The relationship between the mutual inductance of the coils can be expressed by matrix equations based on Kirchhoff's voltage and current laws, as shown in equation (3): （3）; in: j represents an imaginary number, , , , , ; Solving equation (3) based on equation (2) yields the output current of the LCC topology. I 4. Output current of LC topology I 5. As shown in equation (4): （4）; System output current I R and output power P O As shown in equations (5) and (6): （5）; （6）; Step 3, as can be seen from equations (4)-(6), by adjusting the compensation inductor L S and compensating inductor L A value of 4 ensures that the system's output power remains constant under offset conditions; based on the simulated mutual inductance value... M 12 and M 13 The compensation inductance is calculated using a non-dominated particle swarm optimization algorithm. L S and compensating inductor L The value of 4; The transmitter compensation topology module (3) includes compensation capacitors. C 1. The transmitting coil module (4) includes the self-inductance of the transmitting coil. L 1. Compensation capacitor C1 and the self-inductance of the transmitting coil L 1. Forming an S-topology; one of the receiver compensation topology modules (6) consists of a compensation capacitor. C 2. Compensating inductance L The s form an LC topology, and the other receiver compensation topology module (6) consists of a compensation capacitor. C 3. Compensation capacitor C 4. Compensating inductance L 4. The LCC topology is composed; the receiving coil module (5) includes the self-inductance of the receiving coil. L 2. Self-inductance of the receiving coil L 3. The mutual inductances between the transmitting coil and the receiving coil are M12 and M13, respectively; the S-topology and LC-topology form an S-LC compensation topology, and the S-topology and LCC-topology form an S-LCC compensation topology.

2. The method of the single-transmitter dual-receiver coil single-load wireless power transmission system according to claim 1, characterized in that, It also includes calculating the output power characteristics of the S-LC compensation topology and the S-LCC compensation topology, specifically including the following steps: Step 1: Based on the equivalent circuits of S-LC and S-LCC compensation topologies, construct the mathematical models of the S-LC compensation topology and the S-LCC compensation topology, respectively. Step 2: Calculate the relationship between the output power and mutual inductance of the S-LC compensated topology. The resonance condition of the topology is shown in equation (7): （7） The mathematical model for constructing this compensation topology is shown in equation (8): （8） in, , , ; Solve equation (8) using equation (7) to obtain the output current. I 5 and output power P O1 As shown in equations (9) and (10): （9） （10） From equations (9) and (10), it can be seen that the output power and current of the S-LC compensation topology are inversely proportional to the mutual inductance between the coils; Step 3: Calculate the relationship between the output power and mutual inductance of the S-LCC compensation topology. The resonance condition of the topology is shown in equation (11): （11） The mathematical model for constructing this compensation topology is shown in equation (12): （12） in, , , ; Solving equation (12) using equation (11) yields the output current. I 4 and output power P O2 As shown in equations (13) and (14): （13） （14） From equations (13) and (14), it can be seen that the current and output power of the S-LCC compensation topology are inversely proportional to the mutual inductance between the coils.

3. The method of the single-transmitter dual-receiver coil single-load wireless power transmission system according to claim 1, characterized in that, The non-dominated particle swarm optimization algorithm aims to minimize output power fluctuations and achieve high system efficiency, and includes the following steps: Step 1: Define the input parameters, including the simulated mutual inductance values. M 12 and M 13 Define the output power corresponding to the mutual inductance value when the coils are directly aligned as the initial power, and set the compensation inductance. L S and compensating inductor L 4. Search range and algorithm parameters; Step 2: Particle swarm initialization and external archive initialization, randomly generate particles, and convert efficient objectives into minimization problems by adding a negative sign; Step 3: Start iterating according to the set number of iterations, update particle velocity and position, evaluate the new position, update the individual optimal, and update the external archive; Step 4: Based on the weights of the two objectives (6:4), select the final solution.

4. The method of a single-transmitter dual-receiver coil single-load wireless power transmission system according to any one of claims 1 to 3, characterized in that, This method is applied to a single-load wireless power transmission system with a single transmitter and dual receiver coils. The system includes a DC power supply (1), a high-frequency inverter (2), a transmitter compensation topology module (3), a transmitter coil module (4), two receiver coil modules (5), two receiver compensation topology modules (6), a rectifier module (7), a filter capacitor, and a system load module (8). The DC power supply (1) is connected to the input terminal of the high-frequency inverter (2). The output terminal of the high-frequency inverter (2) is connected to the input terminal of the transmitter compensation topology module (3). The output terminal of the transmitter compensation topology module (3) is connected to the input terminal of the transmitter coil module (4). The output terminal of the transmitter coil module (4) is opposite to the input terminals of the two receiver coil modules (5). The output terminals of the two receiver coil modules (5) are connected to the input terminals of the two receiver compensation topology modules (6). The output terminals of the two receiver compensation topology modules (6) are connected in parallel and then connected to the input terminal of the rectifier module (7). The output terminal of the rectifier module (7) is connected to the filter capacitor and the system load module (8).

5. The method of the single-transmitter dual-receiver coil single-load wireless power transmission system according to claim 4, characterized in that, The self-inductance of the receiving coil L 2. Self-inductance of the receiving coil L Mutual induction between 3 M 23 The value is zero, and the two receiving coils adopt an overlapping rectangular coil structure.

6. The method of the single-transmitter dual-receiver coil single-load wireless power transmission system according to claim 4, characterized in that, The high-frequency inverter (2) consists of MOSFETs S1-S4, where MOSFETs S1 and S3 are connected in series, and then MOSFETs S2 and S4 are connected in parallel. The rectifier module (7) is a full-bridge rectifier circuit composed of diodes D1-D4. The filter capacitor and system load module (8) consists of parallel filter capacitors. C e and load R L composition.

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