Novel bidirectional wireless power transmission system, design method, device and medium

Abstract

The invention provides a novel bidirectional wireless power transmission system, a design method, equipment and a medium. According to the novel bidirectional wireless power transmission system, energy is transmitted to double loads through circuits on the left side and the right side, planar square coils with mutually orthogonal left and right sides and an S-S-LCC compensation structure are adopted, the energy utilization rate can be improved, the circuits on the two sides of the wireless power transmission system are mutually independent, constant currents output by the circuits on the two sides do not interfere with each other, and the wireless power transmission efficiency is improved. Therefore, constant current can be output to different loads, and the complexity of a wireless power transmission system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission, and particularly to a novel bidirectional wireless power transmission system, design method, device and medium. Background Art

[0002] Due to the advantages of convenience, environmental protection, reliability, long product life, electric shock prevention, etc. of wireless power transmission technology, wireless power transmission technology has been widely studied. With the increase of transmission distance and the demand scenarios of multi-load power supply, adding relay coils can obtain better performance, which has profound research significance.

[0003] In practical applications, in order for the system to operate stably without being affected by load changes, a constant power supply independent of the load needs to be provided. For example, a power supply with a constant current (CC) output characteristic is necessary for driving light-emitting diodes to have a stable brightness. When multiple loads need to be driven, it is often necessary to increase the number of power supplies, resulting in system complexity. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a novel bidirectional wireless power transmission system, design method, device and medium.

[0005] The first aspect of the present invention provides a novel bidirectional wireless power transmission system, which includes: an inverter circuit, a left circuit and a right circuit. The input end of the inverter circuit is connected to an external power supply, the output end of the left circuit is connected to an external left load, and the output end of the right circuit is connected to an external right load;

[0006] Both the left circuit and the right circuit include a transmitting branch, a relay branch and a receiving branch, and the transmitting branch, the relay branch and the receiving branch are arranged in sequence; the transmitting branch is connected to the inverter circuit;

[0007] The coil of the transmitting branch and the coil of the relay branch are respectively connected in series with a compensation capacitor, the coil of the receiving branch is connected in series with a series compensation capacitor to form a branch, the branch is connected in parallel with a parallel compensation capacitor, and the branch is connected in series with a compensation inductor, jointly constituting the S-S-LCC compensation structure of the novel bidirectional wireless power transmission system;

[0008] The coils of the transmitting branch, the relay branch and the receiving branch in the left circuit are orthogonally distributed with the coils of the transmitting branch, the relay branch and the receiving branch in the right circuit, and all coils are planar square DD coils.

[0009] Optionally, the left circuit is configured to convert the alternating current transmitted by the inverter circuit into direct current and supply power to the left load;

[0010] The right circuit is configured to convert the alternating current transmitted by the inverter circuit into direct current and supply power to the right load.

[0011] Optionally, the inverter circuit includes a first bridge arm and a second bridge arm connected in parallel. The transmitting branch in the left circuit includes a first left coil, a first left compensation capacitor, and a first left parasitic resistor. The first end of the first left coil is connected to the midpoint of the first bridge arm through the first left compensation capacitor, and the second end of the first left coil is connected to the midpoint of the second bridge arm through the first left parasitic resistor;

[0012] The transmitting branch in the right circuit includes a first right coil, a first right compensation capacitor, and a first right parasitic resistor. The first end of the first right coil is connected to the midpoint of the first bridge arm through the first right compensation capacitor, and the second end of the first right coil is connected to the midpoint of the second bridge arm through the first right parasitic resistor.

[0013] Optionally, the relay branch in the left circuit includes a second left coil, a second left compensation capacitor, and a second left parasitic resistor connected in series in sequence; the relay branch in the right circuit includes a second right coil, a second right compensation capacitor, and a second right parasitic resistor connected in series in sequence.

[0014] Optionally, the receiving branch in the left circuit includes a left compensation inductor, a left series compensation capacitor, a left parallel compensation capacitor, a third left coil, a third left parasitic resistor, and a left rectifying branch. The left rectifying branch includes a first left rectifying bridge arm and a second left rectifying bridge arm connected in parallel;

[0015] The first end of the third left coil is connected to the midpoint of the first left rectifying bridge arm through the left compensation inductor and the left series compensation capacitor. The second end of the third left coil is connected to the midpoint of the second left rectifying bridge arm through the third left parasitic resistor. The first end of the left parallel compensation capacitor is connected to the left compensation inductor and the left series compensation capacitor, and the second end of the left parallel compensation capacitor is connected to the third left parasitic resistor and the midpoint of the second left rectifying bridge arm.

[0016] Optionally, the receiving branch in the right circuit includes a right compensation inductor, a right series compensation capacitor, a right parallel compensation capacitor, a third right coil, a third right parasitic resistor, and a right rectifying branch. The right rectifying branch includes a first right rectifying bridge arm and a second right rectifying bridge arm connected in parallel;

[0017] The first end of the third right coil is connected to the midpoint of the first right rectifier bridge arm through the right compensation inductor and the right series compensation capacitor. The second end of the third right coil is connected to the midpoint of the second right rectifier bridge arm through the third right parasitic resistor. The first end of the right parallel compensation capacitor is connected to the right compensation inductor and the right series compensation capacitor. The second end of the right parallel compensation capacitor is connected to the third right parasitic resistor and the midpoint of the second right rectifier bridge arm.

[0018] Based on the same inventive concept, the second aspect of the present invention provides a design method for a novel bidirectional wireless power transmission system, and the method includes:

[0019] Analyze the topology of the novel bidirectional wireless power transmission system and establish an equivalent circuit model of the novel bidirectional wireless power transmission system;

[0020] Based on the equivalent circuit model, construct a current expression of the novel bidirectional wireless power transmission system;

[0021] Based on the current expression, verify the topology output characteristics of the circuit;

[0022] When the topology output characteristic of the circuit is constant current, design the DD coil based on the design parameters of the DD coil;

[0023] Based on the DD coil and the topology, construct the novel bidirectional wireless power transmission system.

[0024] Optionally, the constructing a current expression of the novel bidirectional wireless power transmission system based on the equivalent circuit model includes:

[0025] Quantitatively analyze the equivalent circuit model to obtain the output voltage of the inverter circuit in the novel bidirectional wireless power transmission system, the left impedance parameters, left current parameters, and left mutual inductance parameters of the left circuit in the novel bidirectional wireless power transmission system, and the right impedance parameters, right current parameters, and right mutual inductance parameters of the right circuit in the novel bidirectional wireless power transmission system;

[0026] Based on the output voltage, the left impedance parameters, the left current parameters, and the left mutual inductance parameters, construct a left loop equation of the left circuit;

[0027] Based on the output voltage, the right impedance parameters, the right current parameters, and the right mutual inductance parameters, construct a right loop equation of the right circuit;

[0028] Solve the left - hand loop equation and the right - hand loop equation to obtain the expressions for the left - hand currents of each coil in the left - hand circuit and the expressions for the right - hand currents of each coil in the right - hand circuit.

[0029] Optionally, the expressions for the left - hand currents and the right - hand currents satisfy the following formula:

[0030]

[0031] where, U AB is the output voltage of the inverter circuit, R eqL is the equivalent resistance of the left - hand load, R eqR is the equivalent resistance of the right - hand load, L KL are the self - inductances of the left - hand resonant compensation inductors in the left - hand circuit respectively, L KR is the self - inductance of the right - hand resonant compensation inductor in the right - hand circuit, M 12L is the mutual inductance coefficient between the first left - hand coil and the second left - hand coil in the left - hand circuit, M 23L is the mutual inductance coefficient between the second left - hand coil and the third left - hand coil in the left - hand circuit, M 12R is the mutual inductance coefficient between the first right - hand coil and the second right - hand coil in the right - hand circuit, M 23R is the mutual inductance coefficient between the second right - hand coil and the third right - hand coil in the right - hand circuit, I iL (i = 1, 2, 3) are the currents on each left - hand coil in the left - hand circuit respectively, I iR (i = 1, 2, 3) are the currents on each right - hand coil in the right - hand circuit respectively, I outL is the output current on the left - hand equivalent load, I outR is the output current on the right - hand equivalent load, ω is the resonant angular frequency, and j is the imaginary coefficient of the complex number.

[0032] Optionally, after constructing the novel bidirectional wireless power transfer system based on the DD coil and the topological structure, the method further includes:

[0033] Input the novel bidirectional wireless power transfer system into a circuit simulation system, and use the circuit simulation system to output the left - hand output current and the right - hand output current when different loads are connected to the left and right sides of the novel bidirectional wireless power transfer system;

[0034] When the change value of the left - hand output current is greater than a preset current change threshold, or the right - hand output current is greater than the preset current change threshold, reconstruct the novel bidirectional wireless power transfer system.

[0035] Based on the same inventive concept, the third aspect of the present invention provides a computer device, including: one or more processors;

[0036] The processor is configured to store one or more programs;

[0037] When the one or more programs are executed by the one or more processors, a design method of a novel bidirectional wireless power transmission system as described in any one of the second aspects of the present invention is implemented.

[0038] Based on the same inventive concept, the fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, a design method of a novel bidirectional wireless power transmission system as described in any one of the second aspects of the present invention is implemented.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] The present invention provides a novel bidirectional wireless power transmission system, a design method, a device, and a medium. The novel bidirectional wireless power transmission system realizes energy transmission to dual loads through the left and right circuits, and adopts planar square coils and an S-S-LCC compensation structure that are mutually orthogonal on the left and right sides, which can improve the energy utilization rate, make the two circuits on both sides of the wireless power transmission system independent of each other, and enable the constant currents output by the two circuits on both sides not to interfere with each other, so that a constant current can be output to different loads, reducing the complexity of the wireless power transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of a novel bidirectional wireless power transmission system provided by the present invention;

[0042] Figure 2 A schematic plan view of the arrangement of magnetic coupling coils in a novel bidirectional wireless power transmission system provided by the present invention;

[0043] Figure 3 A topology diagram of a novel bidirectional wireless power transmission system provided by the present invention;

[0044] Figure 4 A flowchart of a design method of a novel bidirectional wireless power transmission system provided by the present invention;

[0045] Figure 5 A schematic diagram of the arrangement and structure of specific coils provided by the present invention;

[0046] Figure 6 A schematic diagram of the dimensions of a DD coil provided by the present invention;

[0047] Figure 7 A design flow of a novel bidirectional S-S-LCC multi-relay wireless power transmission constant current topology provided by the present invention;

[0048] Figure 8 is a flowchart of a design method for a novel bidirectional wireless power transfer system shown in the embodiment Figure 4 shown;

[0049] Figure 9 is a schematic diagram of an equivalent circuit model of a novel bidirectional wireless power transfer system provided by the present invention;

[0050] Figure 10 is a flowchart of another design method for a novel bidirectional wireless power transfer system provided by the present invention;

[0051] Figure 11 is a circuit simulation diagram of a novel bidirectional S-S-LCC system;

[0052] Figure 12 is a waveform diagram of the output current result when the loads are all 10;

[0053] Figure 13 is a schematic diagram of the output current varying with the load resistance;

[0054] Figure 14 is a schematic diagram of the output efficiency varying with the load resistance;

[0055] Figure 15 is a waveform diagram of the output current when the loads on both sides are inconsistent;

[0056] Figure 16 is a block diagram of a computer device provided by the present invention. Detailed implementation manners

[0057] Embodiment 1:

[0058] Figure 1Schematic diagram of a novel bidirectional wireless power transmission system provided by the present invention. The system may include: an inverter circuit 101, a left circuit 102, and a right circuit 103. The input end of the inverter circuit 101 may be connected to an external power supply, the output end of the left circuit 102 may be connected to an external left load, and the output end of the right circuit 103 may be connected to an external right load. Both the left circuit 102 and the right circuit 103 include a transmitting branch, a relay branch, and a receiving branch, which are arranged in sequence. The transmitting branch may be connected to the inverter circuit 101. The coil of the transmitting branch and the coil of the relay branch are respectively connected in series with a compensation capacitor. The coil of the receiving branch is connected in series with a series compensation capacitor to form a branch, and the branch is connected in parallel with a parallel compensation capacitor and then connected in series with a compensation inductor, jointly constituting the S-S-LCC compensation structure of the novel bidirectional wireless power transmission system. The coils of the transmitting branch, the relay branch, and the receiving branch in the left circuit 102 may be orthogonally distributed with the coils of the transmitting branch, the relay branch, and the receiving branch in the right circuit 103, and all coils are planar square DD coils.

[0059] Among them, the left circuit 102 is used to convert the alternating current transmitted by the inverter circuit 101 into direct current and supply power to the left load; the right circuit 103 is used to convert the alternating current transmitted by the inverter circuit 101 into direct current and supply power to the right load. The DD coil may be a device composed of two concentric circular coils, which are respectively called a driving coil and a detection coil, or a transmitting coil and a receiving coil. The coils of the transmitting branch, the relay branch, and the receiving branch in the left circuit 102 are orthogonally distributed with the coils of the transmitting branch, the relay branch, and the receiving branch in the right circuit 103 as Figure 2 shown Figure 2 Schematic layout diagram of the magnetic coupling coils in a novel bidirectional wireless power transmission system provided by the present invention. The novel bidirectional wireless power transmission system has 6 resonant coils, and the left and right coils (i.e., the coils of the transmitting branch, the relay branch, and the receiving branch in the left circuit 102, and the coils of the transmitting branch, the relay branch, and the receiving branch in the right circuit 103) are orthogonally decoupled and do not interfere with each other.

[0060] It should be noted that the left load and the right load can be electrical equipment or electrical energy storage equipment. The S-S-LCC compensation structure can be understood as a series-series-LCC compensation structure. Different from the prior art, in the present invention, a series compensation structure is adopted in the transmitting branch and the relay branch, and an LCC compensation structure is adopted in the receiving branch. The LCC compensation structure can include a compensation inductor and two compensation capacitors, and the compensation inductor and the two compensation capacitors form a T-shaped circuit network. The left branch of the T can be the compensation inductor, and the right branch and the lower branch of the T can be the compensation capacitors respectively.

[0061] The structure of the DD coil can include two coils. Usually, one coil is located at the center of the other coil. These two coils are respectively called the driving coil and the detection coil.

[0062] Optionally, the left circuit 102 and the right circuit 103 can include multiple receiving branches, and each receiving branch can be connected to an external load.

[0063] In the prior art, when it is necessary to drive multiple loads, it is often necessary to increase the number of power supplies, resulting in system complexity. However, the novel bidirectional wireless power transmission system provided by the present invention realizes energy transmission to double loads through the left and right circuits, and adopts left and right mutually orthogonal planar square coils and an S-S-LCC compensation structure, which can improve energy utilization efficiency, make the two circuits of the wireless power transmission system independent of each other, and make the constant currents output by the two circuits not interfere with each other, so that a constant current can be output to different loads, reducing the complexity of the wireless power transmission system.

[0064] Moreover, in terms of charging performance requirements, lithium batteries are also widely used to store electrical energy. The charging process of lithium-ion batteries includes a constant current charging stage. The lithium battery can also be used as the load of the novel bidirectional wireless power transmission system, and a constant current can be provided to one or more lithium batteries simultaneously through the left and right circuits.

[0065] Figure 3 This is a topology diagram of a novel bidirectional wireless power transmission system provided by the present invention. As Figure 3 shown, the inverter circuit 101 can include a first bridge arm and a second bridge arm connected in parallel. The transmitting branch in the left circuit 102 can include a first left coil L 1L , a first left compensation capacitor C 1L and a first left parasitic resistor R 1L . The first end of the first left coil L 1L can be connected to the midpoint A of the first bridge arm through the first left compensation capacitor C 1L . The second end of the first left coil L 1L can be connected to the ground through the first left parasitic resistor R 1Lis connected to the midpoint B of the second bridge arm; the transmitting branch in the right circuit 103 may include a first right coil L 1R , a first right compensation capacitor C 1R , and a first right parasitic resistor R 1R . The first end of the first right coil L 1R may be connected to the midpoint A of the first bridge arm through the first right compensation capacitor C 1R . The second end of the first right coil L 1R may be connected to the midpoint B of the second bridge arm through the first right parasitic resistor R 1R .

[0066] The first bridge arm and the second bridge arm in the inverter circuit 101 may include series-connected MOS (Metal Oxide Semiconductor Field Effect Transistor) tubes, IGBTs (Insulated Gate Bipolar Transistors), or BJTs (Bipolar Junction Transistors), etc. The specific topological structure of the inverter circuit 101 is a commonly used technical means in the art and is widely used in the art. The specific topological structure of the inverter circuit 101 will not be described in detail in the present invention.

[0067] It should be noted that U in may be a DC power supply (i.e., an external power supply), and the DC power supply inputs a current I in to the inverter circuit 101. Q 1 to Q 4 are the switching devices MOS tubes of the full-bridge inverter. The first bridge arm in the inverter circuit 101 may include series-connected MOS tubes Q 1 and MOS tube Q 3 . The second bridge arm may include series-connected MOS tubes Q 2 and MOS tube Q 4 . The voltage between the midpoint A of the first bridge arm and the midpoint B of the second bridge arm is U AB . The inverter circuit 101 may further include an input filter capacitor C FP . The input filter C FP is connected in parallel with the first bridge arm. The current of the first left coil L 1L may be I 1L . The current of the first right coil L 1R may be I 1R .

[0068] Among them, Figure 3 the L in iR , LiL , C iR , C iL and R iR , R iL (i = 1, 2, 3) are the self - inductance, compensation capacitance, and parasitic resistance of the right - hand and left - hand magnetic coupling coils respectively; M ijR , M ijL is the mutual inductance coefficient between every two coils on the right - hand and left - hand sides; D 1R ~D 4R are the diodes of the bridge uncontrolled rectifier; C FS is the output filter capacitor; R eR、 R eL are two load resistors in the system.

[0069] Optionally, still as shown in Figure 3 , the relay branch in the left - hand circuit 102 may include a second left - hand coil L 2L , a second left - hand compensation capacitor C 2L and a second left - hand parasitic resistor R 2L ; the relay branch in the right - hand circuit 103 may include a second right - hand coil L 2R , a second right - hand compensation capacitor C 2R and a second right - hand parasitic resistor R 2R .

[0070] It should be noted that the current in the second left - hand coil L 2L can be I 2L , and the current in the second right - hand coil L 2R can be I 2R . The mutual inductance coefficient between the first left - hand coil L 1L and the second left - hand coil L 2L can be M 12L , and the mutual inductance coefficient between the first right - hand coil L 1R and the second right - hand coil L 2R can be M 12R .

[0071] Optionally, still as shown in Figure 3 , the receiving branch in the left - hand circuit 102 may include a left - hand compensation inductor L KL , a left - hand series compensation capacitor C QL , a left - hand parallel compensation capacitor C KL , a third left - hand coil L 3L , a third left - hand parasitic resistor R 3L and a left - hand rectifying branch, and the left - hand rectifying branch may include a first left - hand rectifying bridge arm and a second left - hand rectifying bridge arm connected in parallel; the first end of the third left - hand coil L 3L may pass through the left - hand compensation inductor L KLand the left - hand series compensation capacitor C QL is connected to the mid - point of the first left - hand rectifier bridge arm. The second end of the third left - hand coil L 3L can be connected to the mid - point of the second left - hand rectifier bridge arm through the third left - hand parasitic resistor R 3L . The first end of the left - hand shunt compensation capacitor C KL can be connected to the left - hand compensation inductor L KL and the left - hand series compensation capacitor C QL . The second end of the left - hand shunt compensation capacitor C KL can be connected to the mid - point of the third left - hand parasitic resistor R 3L and the second left - hand rectifier bridge arm.

[0072] Among them, the left - hand rectifier branch can adopt the topological structure of the rectifier circuit in the prior art, and the topological structure of the left - hand rectifier branch will not be elaborated in detail in the present invention.

[0073] It should be noted that the current of the third left - hand coil L 3L can be I 3L . The input current of the receiving branch in the left - hand circuit 102 to the left - hand rectifier branch can be I abL . The voltage between the mid - point of the first left - hand rectifier bridge arm and the mid - point of the second left - hand rectifier bridge arm can be U abL . The output current of the left - hand rectifier branch can be I outL , and the output voltage can be U outL . The equivalent resistance of the left - hand load can be R eqL . The left - hand rectifier branch may further include an output filter capacitor C FSL . The output filter capacitor C FSL is connected in parallel with the first left - hand rectifier bridge arm. The first left - hand rectifier bridge arm may include a series of diode D 1L and diode D 3L . The second left - hand rectifier bridge arm may include a parallel - series connection of diode D 2L and diode D 4L . The mutual inductance coefficient between the second left - hand coil L 2L and the third left - hand coil L 3L can be M 23L . The mutual inductance coefficient between the first left - hand coil L 1L and the third left - hand coil L 3L can be M 13L .

[0074] Optionally, still as shown in Figure 3 , the receiving branch in the right - hand circuit 103 includes a right - hand compensation inductor L KR , a right - hand series compensation capacitor C QR , a right - hand shunt compensation capacitor CKR and the third right coil L 3R and the third right parasitic resistor R 3R and a right rectifying branch, where the right rectifying branch includes a first right rectifying bridge arm and a second right rectifying bridge arm connected in parallel; the first end of the third right coil L 3R is connected to the midpoint of the first right rectifying bridge arm through the right compensation inductor L KR and the right series compensation capacitor C QR , the second end of the third right coil L 3R is connected to the midpoint of the second right rectifying bridge arm through the third right parasitic resistor R 3R , the first end of the right parallel compensation capacitor C KR is connected to the right compensation inductor L KR and the right series compensation capacitor C QR , and the second end of the right parallel compensation capacitor C KR is connected to the midpoint of the third right parasitic resistor R 3R and the second right rectifying bridge arm.

[0075] Among them, the right rectifying branch can adopt the topological structure of the rectifying circuit in the prior art, and the topological structure of the right rectifying branch will not be described in detail in the present invention.

[0076] It should be noted that the current of the third left coil L 3R can be I 3R . The input current of the receiving branch in the left circuit 102 to the left rectifying branch can be I abR , the voltage between the midpoint of the first left rectifying bridge arm and the midpoint of the second left rectifying bridge arm can be U abR , the output current of the left rectifying branch can be I outR , the output voltage can be U outR , and the equivalent resistance of the left load can be R eqR . The left rectifying branch may further include an output filter capacitor C FSR , and the output filter capacitor C FSR is connected in parallel with the first left rectifying bridge arm. The first left rectifying bridge arm may include a series-connected diode D 1R and diode D 3R , and the second left rectifying bridge arm may include a parallel-connected and series-connected diode D 2R and diode D 4R . The mutual inductance coefficient between the second left coil L 2R and the third left coil L 3R can be M 23R , and the mutual inductance coefficient between the first left coil L 1R and the third left coil L 3RThe mutual inductance coefficient can be M 13R .

[0077] The novel bidirectional S-S-LCC multi-relay wireless power transfer constant-current topology structure proposed by the present invention has a topology structure as Figure 3 shown. In this novel bidirectional constant-current output multi-relay WPT (Wireless Power Transfer) system, there is only one power supply. The topologies on its left and right sides are both S-S-LCC compensation structures. By designing the resonant coils of the system and improving the ordinary S-S-LCC topology, energy can be transmitted to dual loads. This novel bidirectional S-S-LCC multi-relay wireless energy transfer constant-current topology structure uses planar square coils that are mutually orthogonal on the left and right to achieve the effect that the two sides of energy transfer are independent of each other and do not interfere with each other. The total energy transfer distance is up to 1 m, and the overall energy transfer efficiency is as high as 60%. Constant currents can be obtained on both loads.

[0078] Different from the traditional S-S-LCC wireless power transfer system, the present invention uses bilaterally mutually orthogonal DD coils to achieve bidirectional wireless energy transfer. And because the cross-coupling relationship of non-primary coupling is very weak, the effect of independent output of multiple loads without mutual influence is achieved, and a relatively high energy transfer efficiency can be maintained. The novel bidirectional S-S-LCC compensation network adopted by the invention can achieve the effect of a single constant DC voltage input and two constant DC current outputs, and has a simple structure and is easy to produce. Moreover, in response to the requirements of bidirectional energy transfer and independent output, the present invention designs a coil arrangement structure with bilaterally mutually orthogonal placement. By orthogonal decoupling of the magnetic fields of the left and right DD coils, the effect that the cross-coupling of non-primary coupling can be ignored in the circuit is achieved, which simplifies the circuit analysis and can achieve the effect of independent output of the two-side loads.

[0079] Embodiment 2:

[0080] Figure 4 is a flowchart of a design method for a novel bidirectional wireless power transfer system provided by the present invention, as Figure 4 shown. The method may include the following steps:

[0081] In step 401, analyze the topology structure of the novel bidirectional wireless power transfer system and establish an equivalent circuit model of the novel bidirectional wireless power transfer system.

[0082] In step 402, based on the equivalent circuit model, construct a current expression of the novel bidirectional wireless power transfer system.

[0083] In step 403, based on the current expression, verify the topology output characteristics of the circuit.

[0084] In step 404, when the topological output characteristic of the circuit is constant current, the DD coil is designed based on the design parameters of the DD coil.

[0085] In step 405, the novel bidirectional wireless power transmission system is constructed based on the DD coil and the topological structure.

[0086] For example, 1. Related settings of wireless power transmission constant current system

[0087] The new bidirectional SS-LCC compensated multi-relay wireless power transmission system operates at a frequency of 200kHz and uses a total of 6 magnetic coupling coils with a coil parasitic resistance of 0.5Ω. Figure 3 The system parameters in the topology are shown in Table 1.

[0088] Parameter Value Parameter Value f 200 kHz <![CDATA[L 1L 、L 1R > 13.8 μH <![CDATA[L 2L 、L 2R > 189 μH <![CDATA[L 3L 、L 3R > 48 μH <![CDATA[M 12L 、M 12R > 7.24 μH <![CDATA[M 23L 、M 23R > 9 μH <![CDATA[C 1L 、C 1R > 45.89 nF <![CDATA[C 2L 、C 2R > 3.35 nF <![CDATA[C QL 、C QR > 19.2 nF <![CDATA[C KL 、C KR > 42.2 nF <![CDATA[L KL 、L KR > 15 μH <![CDATA[R mos > 0.15 Ω <![CDATA[V D > 0.86V <![CDATA[U in > 20V

[0089] Table 1 System parameters

[0090] Where f is the operating frequency of the new bidirectional SS-LCC compensated multi-relay wireless power transmission system, R mos is the resistance of the MOS tube, V D is the voltage drop of the diode.

[0091] 2. Resonance coil parameter design

[0092] The specific coil arrangement and structure are as follows Figure 5 As shown, the three coils on the left and the three coils on the right are orthogonal to achieve the effect of magnetic field decoupling and no influence on each other. The thickness d of all DD coils is 2 mm. 0 2cm, d 1r and d 1l 2cm, d 2r and d 2l The other size parameters are shown in Table 2.

[0093] Parameter Value Parameter Value <![CDATA[L DD1 > 120 mm <![CDATA[L DD2 > 300 mm <![CDATA[L DD3 > 300 mm <![CDATA[t DD1 > 14 mm <![CDATA[t DD2 > 30 mm <![CDATA[t DD3 > 12 mm <![CDATA[N 1 > 7 turns <![CDATA[N 2 > 15 turns <![CDATA[N 3 > 6 turns d 2 mm

[0094] Table 2 Coil size parameters

[0095] Among them, Figure 6 As shown, L DDi (i is 1, 2 or 3) is the first left coil L 1L , the second left coil L 2L , the second left coil L 3L , first right coil L 1R , the second right coil L 2R Or the second right coil L 3R The side length, t DDi (i is 1, 2 or 3) is the first left coil L1L , the second left coil L 2L , the second left coil L 3L , the first right coil L 1R , the second right coil L 2R or the second right coil L 3R of the iron core width, N 1 is the first left coil L 1L or the first right coil L 1R of the number of turns, N 2 is the second left coil L 2L or the second right coil L 2R of the number of turns, N 3 is the third left coil L 3L or the third right coil L 3R of the number of turns.

[0096] By analyzing the cross-coupling other than the main couplings M 12L , M 12R , M 23L , M 23R by using finite element simulation software, the results are shown in Table 3. It can be seen that although the coils L 1L and L 1R are orthogonally arranged and very close to each other, the coupled mutual inductance M 0 is very weak compared to the main coupling and can be ignored. At the same time, the mutual inductances of other non-adjacent coils are also very weak and can be ignored. Therefore, the theoretical analysis of the novel bidirectional S-S-LCC topology is correct.

[0097] Parameter Value Parameter Value <![CDATA[M 0 > 0.0056 μH <![CDATA[M 1L_3L 、M 1R_3R > 0.3133 μH <![CDATA[M 1R_3L 、M 1L_3R > 0.0004 μH <![CDATA[M 2R_3L 、M 2L_3R > 0.0002 μH <![CDATA[M 3R_3L > <![CDATA[3.2×10 -5 μH]]> <![CDATA[M 1R_2L 、M 1L_2R > 0.0082 μH <![CDATA[M 2R_2L > 0.0095 μH <![CDATA[M 3R_2L 、M 3L_2R > 0.0011 μH <![CDATA[M 2R_1L 、M 2L_1R > 0.0013 μH <![CDATA[M 3R_1L 、M 3L_1R > <![CDATA[8.4×10 -5 μH]]>

[0098] Table 3 Results of cross-coupling finite element simulation of mutual inductance

[0099] Among them, M 1R_3L is the mutual inductance between the first right coil and the third left coil, M 1L_3R is the mutual inductance between the first left coil and the third right coil, M 3R_3L is the mutual inductance between the third right coil and the third left coil, M 2R_2L is the mutual inductance between the second right coil and the second left coil, M 2R_1L is the mutual inductance between the second right coil and the first left coil, M 2L_1R is the mutual inductance between the second left coil and the first right coil, M 1L_3L is the mutual inductance between the first left coil and the third left coil, M 1R_3R is the mutual inductance between the first right coil and the third right coil, M 2R_3L is the mutual inductance between the second right coil and the third left coil, M 2L_3R is the mutual inductance between the second left coil and the third right coil, M 1R_2Lis the mutual inductance between the first right coil and the second left coil, M 1L_2R is the mutual inductance between the first left coil and the second right coil, M 3R_2L is the mutual inductance between the third right coil and the second left coil, M 3L_2R is the mutual inductance between the third left coil and the second right coil, M 3R_1L is the mutual inductance between the third right coil and the first left coil, M 3L_1R is the mutual inductance between the third left coil and the first right coil.

[0100] As Figure 7 shown, Figure 7 is the design process of a novel bidirectional S-S-LCC multi-relay wireless power transfer constant-current topology provided by the present invention. This design process may include:

[0101] The first step is to propose a novel topology structure.

[0102] Aiming at the requirement of bidirectional energy transfer, first optimize and improve the basic S-S-LCC topology, and propose a novel bidirectional S-S-LCC circuit topology.

[0103] The second step is to construct and analyze the equivalent circuit model.

[0104] Among them, in order to quantitatively analyze the energy transfer process, establish and analyze the equivalent circuit model for the novel topology. When conducting theoretical analysis, the influence of non-primary coupled mutual inductance is ignored, and the current expressions of constant-current output on both sides can be obtained. Therefore, the constant-current outputs on both sides can be regarded as constant-current sources for the load.

[0105] The third step is to design the left and right DD coils.

[0106] Among them, designing the left and right DD coils is actually designing the resonant link of the system. Through the analysis of the novel topology, it can be known that in order to obtain a constant-current source, it is necessary to reduce the influence of non-primary coupled mutual inductance so that it can be ignored during the operation of the circuit. Therefore, the coils on both sides of bidirectional transmission must ensure that the main coupling effect on each side is good and all non-primary coupled mutual inductances are very weak. According to the characteristics of the existing DD coils, the DD coils have the decoupling characteristics when arranged orthogonally and have a good coupling relationship when arranged in the same direction. Therefore, design the DD coil structures with orthogonal arrangements on the left and right sides respectively. According to the frequency requirements of the system operation, design the inductance of the DD coils and the values of the corresponding compensation network components.

[0107] The fourth step is to design the inverters and rectifiers in the system.

[0108] Among them, the inverter and rectifier in the design system are the source of AC energy and the output process of DC energy in the resonant link of the design system. The existing full-bridge inverter structure and full-bridge rectifier structure can be adopted. According to the designed left and right DD coils, inverter and rectifier, the circuit of the new bidirectional S-S-LCC multi-relay wireless power transmission constant current system is constructed.

[0109] Step 5: Verify the feasibility of the topology through circuit simulation.

[0110] Among them, the circuit of the new bidirectional S-S-LCC multi-relay wireless power transmission constant current system is simulated. That is, after designing the system topology and parameters according to the above four steps, the relevant circuit simulation software is used to verify whether the designed new bidirectional S-S-LCC multi-relay wireless power transmission system can supply power to the loads on both sides simultaneously and without interference.

[0111] In view of the problem of the constant current demand for the above power supply method, the present invention considers using wireless power transmission technology to supply power to the load with constant current demand, and designs a new bidirectional constant current compensation topology structure. Electric power can be wirelessly transmitted in both forward and backward directions from a shared power source, enabling a single power source to supply power to multiple loads and improving energy utilization efficiency.

[0112] Figure 8 For Figure 4 the flowchart of a design method of a new bidirectional wireless power transmission system shown in the embodiments as illustrated, as Figure 8 shown, the specific implementation manner of step 402 above can include the following steps: Figure 4 shown, the specific implementation manner of step 402 above can include the following steps:

[0113] In step 4021, the equivalent circuit model is quantitatively analyzed to obtain the output voltage of the inverter circuit in the new bidirectional wireless power transmission system, the left impedance parameters, left current parameters, and left mutual inductance parameters of the left circuit in the new bidirectional wireless power transmission system, and the right impedance parameters, right current parameters, and right mutual inductance parameters of the right circuit in the new bidirectional wireless power transmission system.

[0114] In step 4022, based on the output voltage, the left impedance parameters, the left current parameters, and the left mutual inductance parameters, the left loop equation of the left circuit is constructed.

[0115] In step 4023, based on the output voltage, the right impedance parameters, the right current parameters, and the right mutual inductance parameters, the right loop equation of the right circuit is constructed.

[0116] In step 4024, solve the left - hand loop equation and the right - hand loop equation to obtain the expressions for the left - hand currents of each coil in the left - hand circuit and the expressions for the right - hand currents of each coil in the right - hand circuit.

[0117] The expressions for the left - hand currents and the right - hand currents satisfy the following formula:

[0118]

[0119] where U AB is the output voltage of the inverter circuit, R eqL is the equivalent resistance of the left - hand load, R eqR is the equivalent resistance of the right - hand load, L KL are the self - inductances of the left - hand resonant compensation inductors in the left - hand circuit respectively, L KR is the self - inductance of the right - hand resonant compensation inductor in the right - hand circuit, M 12L is the mutual inductance coefficient between the first left - hand coil and the second left - hand coil in the left - hand circuit, M 23L is the mutual inductance coefficient between the second left - hand coil and the third left - hand coil in the left - hand circuit, M 12R is the mutual inductance coefficient between the first right - hand coil and the second right - hand coil in the right - hand circuit, M 23R is the mutual inductance coefficient between the second right - hand coil and the third right - hand coil in the right - hand circuit, I iL (i = 1, 2, 3) are the currents on each left - hand coil in the left - hand circuit respectively, I iR (i = 1, 2, 3) are the currents on each right - hand coil in the right - hand circuit respectively, I outL is the output current on the left - hand equivalent load, I outR is the output current on the right - hand equivalent load, ω is the resonant angular frequency, and j is the imaginary coefficient of the complex number.

[0120] Exemplarily, simplify the topological diagram shown in Figure 3 . Since the mutual inductance between non - adjacent coils is very weak, M 13R and M 13L can be ignored, and the equivalent circuit model shown in Figure 9 (i.e., the fundamental - wave equivalent circuit) is obtained. By quantitatively analyzing the equivalent circuit model, the output voltage of the inverter circuit in the novel bidirectional wireless power transfer system, the left - hand impedance parameters, left - hand current parameters, and left - hand mutual inductance parameters of the left - hand circuit, and the right - hand impedance parameters, right - hand current parameters, and right - hand mutual inductance parameters of the right - hand circuit are obtained.

[0121] The parameter design of each resonant coil is the same, and the resonant condition of the system can be:

[0122]

[0123] Based on Equation (1), Figure 9 the impedance within the box shown can be expressed as:

[0124]

[0125] where Z 1R is the impedance composed of the first right coil L 1R and the first right compensation capacitor C 1R ; Z 2R is the impedance composed of the second right coil L 2R and the second right compensation capacitor C 2R ; Z 3R is the impedance composed of the third right coil L 3R and the right series compensation capacitor C QR ; Z CKR is the impedance composed of the right parallel compensation capacitor C KR ; Z LKR is the impedance composed of the right compensation inductor L KR ; Z 1L is the impedance composed of the first left coil L 1L and the first left compensation capacitor C 1L ; Z 2L is the impedance composed of the second left coil L 2L and the second left compensation capacitor C 2L ; Z 3L is the impedance composed of the third left coil L 3L and the left series compensation capacitor C QL ; Z CKL is the impedance composed of the left parallel compensation capacitor C KL ; Z LKL is the impedance composed of the left compensation inductor L KL .

[0126] From Equation (2) and Kirchhoff's voltage law, the left and right loop equations of the system can be obtained as shown in (3) and (4) respectively:

[0127]

[0128] where I outL and I outR are the output currents on the left and right equivalent loads R eqL and R eqR respectively.

[0129] By solving the left and right loop equations of the system (i.e., Equations (3) and (4)), the left current expression and the right current expression (the currents of each coil in the system and the load current) are obtained:

[0130]

[0131] As can be seen from Equation (5), the output currents I outR and I outL are only related to the resonant angular frequency, the resonant compensation inductance L K , the mutual inductance M 23 and M 12 , and the output voltage of the inverter. Obviously, I outR and I outL are independent of the equivalent loads R eqR and R eqL . This indicates that when a single voltage source is used as the system input, constant output currents independent of the loads can be obtained on the two loads on the left and right sides. Therefore, the desired output currents can be achieved by carefully designing the parameters of the resonant inductance and the mutual inductance of the coils, and the proposed system has the characteristic of bidirectional independent output. When the parameters on both sides are different, it does not affect the output on the other side.

[0132] The input impedances Z in of the left and right sides of the proposed novel bidirectional S-S-LCC multi-relay wireless energy transfer system can be respectively derived as follows:

[0133]

[0134] where Z inL is the left-side input impedance of the novel bidirectional S-S-LCC multi-relay wireless energy transfer system, and Z inR is the right-side input impedance of the novel bidirectional S-S-LCC multi-relay wireless energy transfer system.

[0135] As can be seen from Equations (6) and (7), the input impedance of the system is also of pure resistance nature, and the system can achieve ZPA (Zero Phase Angle input).

[0136] The inverter switching loss P MOS of the inventive system is mainly caused by MOSFET (i.e., MOS transistor) devices. According to the structure of the full-bridge inverter circuit, it can be obtained that:

[0137]

[0138] where R MOS_on is the on-resistance of the MOSFET.

[0139] The rectifier loss is mainly caused by the forward voltage drop of the diode, and it can be obtained that:

[0140]

[0141] where V D is the forward voltage drop of the diode, R D is the on-resistance of the diode, Prec It is the rectifier loss.

[0142] The total loss P of the coil parasitic resistance coil can be written as:

[0143]

[0144] The input power P of the novel bidirectional S-S-LCC multi-relay WPT system in and the output power P out The calculation expressions are respectively:

[0145]

[0146] P in = U in I in

[0147] The system efficiency can be expressed as:

[0148]

[0149] Among them, η represents the system efficiency.

[0150] Figure 10 This is the flowchart of another design method of the novel bidirectional wireless power transmission system provided by the present invention. As Figure 10 shown, after step 405 shown above Figure 4 the method may further include the following steps:

[0151] In step 406, input the novel bidirectional wireless power transmission system into the circuit simulation system, and use the circuit simulation system to output the left-side output current and the right-side output current when different loads are connected to both sides of the novel bidirectional wireless power transmission system.

[0152] In step 407, when the change value of the left-side output current is greater than the preset current change threshold, or the right-side output current is greater than the preset current change threshold, reconstruct the novel bidirectional wireless power transmission system.

[0153] The present invention can achieve bidirectional and efficient wireless power transmission of a single power source to two loads, and can maintain the constant current output characteristic even when the load changes to a certain extent. When the system inputs a voltage of 20V and the operating frequency is 200kHz, the simulation circuit is as Figure 11 shown.

[0154] Among them, PWM1 (Pulse Width Modulation), PWM2, PWM3, and PWM4 are respectively the control signals of the MOS transistors in the inverter circuit. VAB+ and VAB- are respectively the positive output terminal and the negative output terminal of the inverter circuit.

[0155] When both loads are 10 Ω, the simulation output current waveform results are as Figure 12 shown. It can be seen that when the left and right coil parameters, coil arrangements, and loads are the same, the outputs on the two loads are the same.

[0156] Figure 13 Fig. shows the schematic diagram of the output efficiency varying with the load resistance. As Figure 13 shown, when the load resistance R varies in the range of 10 - 30 Ω, the variation of the output current I out on both sides. When the load resistance R is 10 Ω, the effective value of the output current on the load is 1.07 A, and when the load resistance R is 30 Ω, the effective value of the output current on the load is 0.96 A, with only a 1% change. This is due to the losses caused by the parasitic resistance in the actual circuit. Therefore, the proposed new topology can achieve a constant current output effect within a wide load range.

[0157] Figure 14 Fig. shows the schematic diagram of the output efficiency varying with the load resistance. As Figure 14 shown, when the load resistance R varies in the range of 10 - 30 Ω, the variation of the system output efficiency with the load resistance R. From the results, it can be seen that the system efficiency is higher than 60% and can be maintained at a relatively high level.

[0158] Figure 15 Fig. is the output current waveform diagram when the loads on both sides are inconsistent. From the results, it can be seen that when the left load is 10 Ω and the right load is 30 Ω, the effective value of the left load current I outL is 1.06 A, and the effective value of the right load current I outR is 0.97 A. Comparing with the Figure 11 results data, it can be seen that the change of one load will not cause the change of the output of the other load.

[0159] Embodiment 3:

[0160] Based on the same inventive concept, the present invention also provides a computer device, as Figure 16 shown. The computer device includes a processor and a memory. The memory is used to store a computer program, and the computer program includes program instructions. The processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may also be other general - purpose processors, digital signal processors (DSP), application - specific integrated circuits

[0161] (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, and are suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the design method of a new type of bidirectional wireless power transmission system in the above embodiments.

[0162] Embodiment 4:

[0163] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a computer device and is used to store programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and, of course, the extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, and this storage space stores the operating system of the terminal. And, in this storage space, one or more instructions suitable for being loaded and executed by the processor are also stored. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. One or more instructions stored in the computer-readable storage medium can be loaded and executed by the processor to implement the steps of the design method of a new type of bidirectional wireless power transmission system in the above embodiments.

[0164] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0165] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to produce a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices produce means for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0166] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including instruction means that implement the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0167] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0168] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A novel two-way wireless power transmission system, characterized in that: The system comprises: an inverter circuit, a left circuit and a right circuit, wherein the input end of the inverter circuit is connected to an external power supply, the output end of the left circuit is connected to an external left load, and the output end of the right circuit is connected to an external right load; The left circuit and the right circuit both include a transmitting branch, a relay branch and a receiving branch, and the transmitting branch, the relay branch and the receiving branch are arranged in sequence; the transmitting branch is connected to the inverter circuit; The coil of the transmitting branch and the coil of the relay branch are respectively connected in series with the compensation capacitor, the coil of the receiving branch is connected in series with the series compensation capacitor to form a branch, the branch is connected in parallel with the parallel compensation capacitor, and the branch is connected in series with the compensation inductor, together forming the SS-LCC compensation structure of the novel bidirectional wireless power transmission system; The coils of the transmitting branch, the relay branch and the receiving branch in the left circuit are orthogonally distributed with the coils of the transmitting branch, the relay branch and the receiving branch in the right circuit, and all coils are planar square DD coils.

2. The system according to claim 1, characterized in that The left circuit is used to convert the alternating current sent by the inverter circuit into direct current and supply power to the left load; The right side circuit is used to convert the alternating current sent by the inverter circuit into direct current and supply power to the right side load.

3. The system according to claim 1, characterized in that The inverter circuit includes a first bridge arm and a second bridge arm connected in parallel, the transmitting branch in the left circuit includes a first left coil, a first left compensation capacitor and a first left parasitic resistor, the first end of the first left coil is connected to the midpoint of the first bridge arm through the first left compensation capacitor, and the second end of the first left coil is connected to the midpoint of the second bridge arm through the first left parasitic resistor; The transmitting branch in the right circuit includes a first right coil, a first right compensation capacitor and a first right parasitic resistor, the first end of the first right coil is connected to the midpoint of the first bridge arm through the first right compensation capacitor, and the second end of the first right coil is connected to the midpoint of the second bridge arm through the first right parasitic resistor.

4. The system according to claim 1, characterized in that The relay branch in the left circuit includes a second left coil, a second left compensation capacitor and a second left parasitic resistor connected in series in sequence; the relay branch in the right circuit includes a second right coil, a second right compensation capacitor and a second right parasitic resistor connected in series in sequence.

5. The system according to any one of claims 1 to 4, characterized in that: The receiving branch in the left circuit includes a left compensation inductor, a left series compensation capacitor, a left parallel compensation capacitor, a third left coil, a third left parasitic resistor and a left rectification branch, and the left rectification branch includes a first left rectification bridge arm and a second left rectification bridge arm connected in parallel; The first end of the third left coil is connected to the midpoint of the first left rectifier bridge arm through the left compensation inductor and the left series compensation capacitor, the second end of the third left coil is connected to the midpoint of the second left rectifier bridge arm through the third left parasitic resistor, the first end of the left parallel compensation capacitor is connected to the left compensation inductor and the left series compensation capacitor, and the second end of the left parallel compensation capacitor is connected to the third left parasitic resistor and the midpoint of the second left rectifier bridge arm.

6. The system according to claim 5, characterized in that The receiving branch in the right circuit includes a right compensation inductor, a right series compensation capacitor, a right parallel compensation capacitor, a third right coil, a third right parasitic resistor and a right rectification branch, and the right rectification branch includes a first right rectification bridge arm and a second right rectification bridge arm connected in parallel; The first end of the third right-side coil is connected to the midpoint of the first right-side rectifier bridge arm through the right-side compensation inductor and the right-side series compensation capacitor, the second end of the third right-side coil is connected to the midpoint of the second right-side rectifier bridge arm through the third right-side parasitic resistor, the first end of the right-side parallel compensation capacitor is connected to the right-side compensation inductor and the right-side series compensation capacitor, and the second end of the right-side parallel compensation capacitor is connected to the third right-side parasitic resistor and the midpoint of the second right-side rectifier bridge arm.

7. A design method for a novel bidirectional wireless power transmission system, characterized in that: The method comprises: Analyze the topological structure of the novel bidirectional wireless power transmission system and establish an equivalent circuit model of the novel bidirectional wireless power transmission system; Based on the equivalent circuit model, construct a current expression for the novel bidirectional wireless power transmission system; Based on the current expression, verify the topological output characteristics of the circuit; When the topological output characteristic of the circuit is constant current, designing the DD coil based on the design parameters of the DD coil; Based on the DD coil and the topological structure, the novel bidirectional wireless power transmission system is constructed.

8. The method according to claim 7, characterized in that The current expression of the novel bidirectional wireless power transmission system is constructed based on the equivalent circuit model, including: Quantitatively analyzing the equivalent circuit model to obtain the output voltage of the inverter circuit in the novel two-way wireless power transmission system, the left impedance parameter, the left current parameter and the left mutual inductance parameter of the left circuit in the novel two-way wireless power transmission system, and the right impedance parameter, the right current parameter and the right mutual inductance parameter of the right circuit in the novel two-way wireless power transmission system; Constructing a left loop equation of the left circuit based on the output voltage, the left impedance parameter, the left current parameter and the left mutual inductance parameter; Constructing a right-side loop equation of the right-side circuit based on the output voltage, the right-side impedance parameter, the right-side current parameter and the right-side mutual inductance parameter; The left-side loop equation and the right-side loop equation are solved to obtain a left-side current expression of each coil in the left-side circuit and a right-side current expression of each coil in the right-side circuit.

9. The method according to claim 8, characterized in that The current expression on the left and the current expression on the right satisfy the following formula: Among them, U AB is the output voltage of the inverter circuit, R eqL is the equivalent resistance of the load on the left, R eqR is the equivalent resistance of the load on the right, L KL are the self-inductance of the left resonant compensation inductor in the left circuit, L KR is the self-inductance of the right resonant compensation inductor in the right circuit, M 12L is the mutual inductance between the first left coil and the second left coil in the left circuit, M 23L is the mutual inductance between the second left coil and the third left coil in the left circuit, M 12R is the mutual inductance between the first right coil and the second right coil in the right circuit, M 23R is the mutual inductance coefficient between the second right coil and the third right coil in the right circuit, I iL (i=1, 2, 3) are the currents on the left coils in the left circuit, I iR (i=1,2,3) are the currents on the right coils in the right circuit, I outL is the output current on the left equivalent load, I outR is the output current on the equivalent load on the right, ω is the resonant angular frequency, and j is the imaginary coefficient of the complex number.

10. The method according to claim 7, characterized in that After constructing the novel bidirectional wireless power transmission system based on the DD coil and the topological structure, the method further includes: Input the novel bidirectional wireless power transmission system into a circuit simulation system, and use the circuit simulation system to output a left-side output current and a right-side output current when different loads are connected to the left and right sides of the novel bidirectional wireless power transmission system; When the change value of the left output current is greater than the preset current change threshold, or the right output current is greater than the preset current change threshold, the novel bidirectional wireless power transmission system is reconstructed.

11. A computer device, characterized in that: include: one or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, the design method of the novel bidirectional wireless power transmission system as claimed in any one of claims 7 to 10 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the design method of the novel bidirectional wireless power transmission system as described in any one of claims 7 to 10 is implemented.

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