Anti-offset detuning wireless power transmission hybrid compensation network parameter design method, device and equipment

Abstract

The invention discloses an anti-offset detuning wireless power transmission hybrid compensation network parameter design method, device and equipment, the method is realized based on a hybrid compensation circuit, and the hybrid compensation circuit is analyzed to obtain a hybrid compensation equivalent circuit; introducing a detuning coefficient to carry out detuning simplified analysis on the LCC-S equivalent loop, and constructing an LCC-S tuning parameter expression formula; selecting a target detuning coefficient corresponding to an LCC-S mutual inductance value when an LCC-S output power derivative is 0 based on an output power and extreme value mutual inductance value expression in a mode of adjusting the detuning coefficient; performing detuning condition mathematical analysis on the two equivalent loops according to the detuning parameters and the coupling coefficients to obtain a power fluctuation expression; and with the minimum power fluctuation as a target, performing optimization calculation according to a power fluctuation expression to obtain a target detuning parameter. According to the method, the technical problem that the anti-offset capability of the system is relatively weak due to the fact that the existing hybrid topological parameter design depends on the resonance state of the system and the output fluctuation of the detuning condition cannot be controlled can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit topology analysis, and in particular to a method, device and equipment for designing parameters of a hybrid compensation network for detuned wireless power transmission that is resistant to offset. Background Art

[0002] As a new type of intelligent power transmission technology, wireless power transmission technology can get rid of the constraints of cables and has the advantages of high efficiency, safety and strong environmental adaptability. In particular, in the application of electric vehicle charging, the use of wireless power transmission technology can not only solve the problems of long charging time and short driving range of electric vehicles, but also does not require precise alignment and plugging, greatly improving the convenience of charging and electricity use, and has attracted widespread attention from countries around the world. However, since there is a certain transmission distance between the transmitting side and the receiving side of the magnetic coupling mechanism and there is no physical connection, the coils on both sides are prone to offset, which is one of the characteristics of the wireless power transmission system.

[0003] Existing wireless power transmission technologies mostly use hybrid topology structures to achieve good anti-misalignment tolerance. However, the current hybrid topology parameter design mostly relies on the system resonant state design. Once detuned, the output voltage and regulated current will fluctuate severely, resulting in a large system offset and weak anti-misalignment capability, which cannot meet the actual needs of the system. Summary of the invention

[0004] The present application provides a method, device and equipment for designing parameters of a hybrid compensation network for detuned wireless power transmission that is resistant to offset, which is used to solve the technical problem that the existing hybrid topology parameter design depends on the system resonance state and cannot control the output fluctuation under detuning conditions, resulting in weak system anti-offset capability.

[0005] In view of this, the first aspect of the present application provides a method for designing parameters of a hybrid compensation network for detuned wireless power transmission with an anti-offset, the method being implemented based on a hybrid compensation circuit, the hybrid compensation circuit comprising: an inverter circuit, a hybrid compensation network and a rectifier circuit;

[0006] The inverter circuit includes two bridge arms formed by four MOSFET switch tubes;

[0007] The hybrid compensation network includes a primary compensation network and a secondary compensation network, which are divided into an LCC-S topology network and an S-LCC topology network according to the topology structure;

[0008] The rectifier circuit includes two bridge arms formed by four symmetrical diodes;

[0009] The hybrid compensation network is connected in parallel with the transmitting end of the inverter circuit and in series with the receiving end of the rectifier circuit;

[0010] The method comprises:

[0011] The hybrid compensation circuit is analyzed by using a fundamental wave approximation method to obtain a hybrid compensation equivalent circuit, wherein the hybrid compensation equivalent circuit includes an LCC-S equivalent circuit and an S-LCC equivalent circuit;

[0012] A detuning coefficient is introduced to simplify the detuning analysis of the LCC-S equivalent circuit, and an LCC-S tuning parameter expression formula is constructed, wherein the LCC-S tuning parameter expression formula includes an LCC-S output power expression and an LCC-S extreme mutual inductance value expression;

[0013] By adjusting the detuning coefficient, based on the LCC-S output power expression and the LCC-S extreme mutual inductance expression, the detuning coefficient corresponding to the LCC-S mutual inductance value obtained when the LCC-S output power derivative value is 0 is selected as the target detuning coefficient;

[0014] Performing mathematical analysis of detuning conditions on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient, generating a circuit total output power expression and a power fluctuation expression;

[0015] With the goal of minimizing power fluctuation, an optimization calculation is performed based on the total output power expression of the circuit and the power fluctuation expression to obtain a target detuning parameter.

[0016] Preferably, the first MOSFET switch tube and the second MOSFET switch tube in the inverter circuit constitute a first bridge arm;

[0017] The third MOSFET switch tube and the fourth MOSFET switch tube form a second bridge arm.

[0018] Preferably, the primary compensation network and the secondary compensation network in the hybrid compensation network are connected in a dual compensation topology cascade manner, and an LCC-S topology network and an S-LCC topology network are generated in a topology structure in which the primary compensation is connected in parallel and the secondary compensation is connected in series;

[0019] The LCC-S topology network includes a first compensation inductor and three first compensation capacitors, and the output voltage of the LCC-S topology network is inversely proportional to the offset;

[0020] The S-LCC topology network includes a second compensation inductor and three second compensation capacitors, and the output voltage of the S-LCC topology network is proportional to the offset.

[0021] Preferably, the introduction of the detuning coefficient, the detuning simplified analysis of the LCC-S equivalent circuit, and the construction of the LCC-S tuning parameter expression formula include:

[0022] The detuning coefficient is introduced to perform a detuning simplified analysis on the LCC-S equivalent circuit, and an expression for the LCC-S equivalent input impedance is obtained;

[0023] Analyze the first compensation inductance when the LCC-S equivalent input impedance presents pure resistance according to the LCC-S equivalent input impedance expression;

[0024] Calculating an LCC-S output power expression according to the first compensation inductance and the first mutual inductance value;

[0025] The mutual inductance derivative analysis is performed according to the LCC-S output power expression to obtain the LCC-S extreme mutual inductance value expression.

[0026] Preferably, the performing of mathematical analysis of detuning conditions on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient to generate a circuit total output power expression and a power fluctuation expression comprises:

[0027] Calculating the S-LCC equivalent input impedance when the LCC-S equivalent circuit and the S-LCC equivalent circuit meet a preset resonance condition according to the detuning parameter;

[0028] Analyze the second compensation inductance when the S-LCC equivalent input impedance presents pure resistance;

[0029] Calculating an S-LCC output power expression according to the second compensation inductance and the second mutual inductance value, wherein the second mutual inductance value is determined according to a coupling coefficient;

[0030] Perform a topological coupling analysis based on the coupling coefficient, the LCC-S output power expression, and the S-LCC output power expression to obtain a total output power expression of the circuit;

[0031] The coupling coefficient is derived and analyzed based on the total output power expression of the circuit, and the output power fluctuation analysis is performed according to a preset coupling range to obtain a power fluctuation expression.

[0032] A second aspect of the present application provides a device for designing parameters of a hybrid compensation network for detuned wireless power transmission with an anti-drift, the device being implemented based on a hybrid compensation circuit, the hybrid compensation circuit comprising: an inverter circuit, a hybrid compensation network and a rectifier circuit;

[0033] The inverter circuit includes two bridge arms formed by four MOSFET switch tubes;

[0034] The hybrid compensation network includes a primary compensation network and a secondary compensation network, which are divided into an LCC-S topology network and an S-LCC topology network according to the topology structure;

[0035] The rectifier circuit includes two bridge arms formed by four symmetrical diodes;

[0036] The hybrid compensation network is connected in parallel with the transmitting end of the inverter circuit and in series with the receiving end of the rectifier circuit;

[0037] The device comprises:

[0038] A circuit equivalent unit, used for analyzing the hybrid compensation circuit by adopting a fundamental wave approximation method to obtain a hybrid compensation equivalent circuit, wherein the hybrid compensation equivalent circuit includes an LCC-S equivalent circuit and an S-LCC equivalent circuit;

[0039] A detuning analysis unit, used for introducing a detuning coefficient, performing a detuning simplified analysis on the LCC-S equivalent circuit, and constructing an LCC-S tuning parameter expression formula, wherein the LCC-S tuning parameter expression formula includes an LCC-S output power expression and an LCC-S extreme mutual inductance value expression;

[0040] A coefficient design unit, configured to select, by adjusting the detuning coefficient, a detuning coefficient corresponding to the LCC-S mutual inductance value obtained when the LCC-S output power derivative value is 0 as a target detuning coefficient based on the LCC-S output power expression and the LCC-S extreme mutual inductance value expression;

[0041] A conditional analysis unit, used for performing a detuning condition mathematical analysis on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient, and generating a circuit total output power expression and a power fluctuation expression;

[0042] The parameter determination unit is used to optimize and calculate the target detuning parameter according to the total output power expression of the circuit and the power fluctuation expression with the goal of minimizing the power fluctuation.

[0043] Preferably, the primary compensation network and the secondary compensation network in the hybrid compensation network are connected in a dual compensation topology cascade manner, and an LCC-S topology network and an S-LCC topology network are generated in a topology structure in which the primary compensation is connected in parallel and the secondary compensation is connected in series;

[0044] The LCC-S topology network includes a first compensation inductor and three first compensation capacitors, and the output voltage of the LCC-S topology network is inversely proportional to the offset;

[0045] The S-LCC topology network includes a second compensation inductor and three second compensation capacitors, and the output voltage of the S-LCC topology network is proportional to the offset.

[0046] Preferably, the detuning analysis unit is specifically used for:

[0047] The detuning coefficient is introduced to perform a detuning simplified analysis on the LCC-S equivalent circuit, and an expression for the LCC-S equivalent input impedance is obtained;

[0048] Analyze the first compensation inductance when the LCC-S equivalent input impedance presents pure resistance according to the LCC-S equivalent input impedance expression;

[0049] Calculating an LCC-S output power expression according to the first compensation inductance and the first mutual inductance value;

[0050] The mutual inductance derivative analysis is performed according to the LCC-S output power expression to obtain the LCC-S extreme mutual inductance value expression.

[0051] Preferably, the condition analysis unit is specifically used to:

[0052] Calculating the S-LCC equivalent input impedance when the LCC-S equivalent circuit and the S-LCC equivalent circuit meet a preset resonance condition according to the detuning parameter;

[0053] Analyze the second compensation inductance when the S-LCC equivalent input impedance presents pure resistance;

[0054] Calculating an S-LCC output power expression according to the second compensation inductance and the second mutual inductance value, wherein the second mutual inductance value is determined according to a coupling coefficient;

[0055] Perform a topological coupling analysis based on the coupling coefficient, the LCC-S output power expression, and the S-LCC output power expression to obtain a total output power expression of the circuit;

[0056] The coupling coefficient is derived and analyzed based on the total output power expression of the circuit, and the output power fluctuation analysis is performed according to a preset coupling range to obtain a power fluctuation expression.

[0057] A third aspect of the present application provides a device for designing parameters of a hybrid compensation network for detuned wireless power transmission with resistance to deviation, the device comprising a processor and a memory;

[0058] The memory is used to store program code and transmit the program code to the processor;

[0059] The processor is used to execute the method for designing parameters of a hybrid compensation network for detuned wireless power transmission with resistance to offset according to the instructions in the program code.

[0060] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0061] In the present application, a method for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-offset is provided. The method is implemented based on a hybrid compensation circuit. The hybrid compensation circuit includes: an inverter circuit, a hybrid compensation network and a rectifier circuit; the inverter circuit includes two bridge arms consisting of four MOSFET switching tubes; the hybrid compensation network includes a primary compensation network and a secondary compensation network, which are divided into an LCC-S topology network and an S-LCC topology network according to the topological structure; the rectifier circuit includes two bridge arms consisting of four symmetrical diodes; the hybrid compensation network is connected in parallel with the transmitting end of the inverter circuit and in series with the receiving end of the rectifier circuit.

[0062] The method includes: using a fundamental wave approximation method to analyze a hybrid compensation circuit to obtain a hybrid compensation equivalent circuit, wherein the hybrid compensation equivalent circuit includes an LCC-S equivalent circuit and an S-LCC equivalent circuit; introducing a detuning coefficient, performing a detuning simplified analysis on the LCC-S equivalent circuit, and constructing an LCC-S tuning parameter expression formula, wherein the LCC-S tuning parameter expression formula includes an LCC-S output power expression and an LCC-S extreme mutual inductance value expression; by adjusting the detuning coefficient, based on the LCC-S output power expression and the LCC-S extreme mutual inductance value expression, selecting the detuning coefficient corresponding to the LCC-S mutual inductance value obtained when the LCC-S output power derivative value is 0 as the target detuning coefficient; performing a mathematical analysis of the detuning conditions of the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient, generating a circuit total output power expression and a power fluctuation expression; taking the minimum power fluctuation as the goal, performing an optimization calculation according to the circuit total output power expression and the power fluctuation expression, and obtaining the target detuning parameter.

[0063] The method for designing parameters of a hybrid compensation network for detuned wireless power transmission that is resistant to offset provided by the present application introduces a detuning coefficient into a hybrid topology circuit with anti-offset capability, namely, a hybrid compensation circuit; the LCC-S topology network and the S-LCC topology network in the hybrid compensation network can smooth the fluctuation of the output voltage when a system offset occurs, thereby realizing system anti-offset. In the specific parameter design process, a detuning condition is set for the topology structure and a detuning coefficient is introduced, thereby realizing a mathematical analysis of the system under a detuning condition, and based on some power flow parameter requirements for the stable operation of the system, the optimization of the detuning coefficient and the detuning parameter is constrained, and the detuning coefficient is continuously adjusted to obtain the target detuning coefficient and parameters; this process fully considers the impact of detuning on the system output, and can ensure that the system can still maintain a stable output in a detuned state, thereby improving the system's anti-offset capability. Therefore, the present application can solve the technical problem that the existing hybrid topology parameter design depends on the system's resonant state, cannot control the output fluctuation in a detuned state, and results in a weak system anti-offset capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1A schematic diagram of a hybrid compensation circuit structure of a method for designing parameters of a hybrid compensation network for detuned wireless power transmission with an anti-offset configuration provided in an embodiment of the present application;

[0065] Figure 2 A flow chart of a method for designing parameters of a hybrid compensation network for detuned wireless power transmission with an anti-drifting function provided in an embodiment of the present application;

[0066] Figure 3 A schematic diagram of a hybrid compensation equivalent circuit structure corresponding to the hybrid compensation circuit provided in an embodiment of the present application;

[0067] Figure 4 A simplified circuit structure diagram of the LCC-S equivalent circuit provided in an embodiment of the present application;

[0068] Figure 5 A simplified circuit structure diagram of the S-LCC equivalent circuit provided in an embodiment of the present application;

[0069] Figure 6 The relationship between the total output power and the coupling coefficient of the system provided in the embodiment of the present application is shown in the following figure. Figure 1 ;

[0070] Figure 7 The relationship between the total output power and the coupling coefficient of the system provided in the embodiment of the present application is shown in the following figure. Figure 2 ;

[0071] Figure 8 The relationship between the total output power and the coupling coefficient of the system provided in the embodiment of the present application is shown in the following figure. Figure 3 ;

[0072] Fig. 9 Schematic diagram of simulated voltage and current waveforms of the hybrid compensation system under rated working conditions provided for the application example;

[0073] Fig.10 A schematic diagram of the structure of a device for designing parameters of a hybrid compensation network for detuned wireless power transmission that is resistant to deviation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0074] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0075] For easier understanding, see Figure 1The present application provides an embodiment of a method for designing parameters of a hybrid compensation network for detuned wireless power transmission that is resistant to offset. The method is implemented based on a hybrid compensation circuit, and the hybrid compensation circuit includes: an inverter circuit, a hybrid compensation network, and a rectifier circuit.

[0076] The inverter circuit includes two bridge arms composed of four MOSFET switch tubes;

[0077] The hybrid compensation network includes the primary compensation network and the secondary compensation network, which can be divided into LCC-S topology network and S-LCC topology network according to the topology structure;

[0078] The rectifier circuit includes two bridge arms formed by four symmetrical diodes;

[0079] The hybrid compensation network is connected in parallel with the transmitting end of the inverter circuit and in series with the receiving end of the rectifier circuit.

[0080] Furthermore, the first MOSFET switch tube and the second MOSFET switch tube in the inverter circuit form a first bridge arm;

[0081] The third MOSFET switch tube and the fourth MOSFET switch tube form a second bridge arm.

[0082] Furthermore, the primary compensation network and the secondary compensation network in the hybrid compensation network are connected in a dual compensation topology cascade manner, and an LCC-S topology network and an S-LCC topology network are generated in a topology structure in which the primary compensation is connected in parallel and the secondary compensation is connected in series.

[0083] The LCC-S topology network includes a first compensation inductor and three first compensation capacitors, and the output voltage of the LCC-S topology network is inversely proportional to the offset;

[0084] The S-LCC topology network includes a second compensation inductor and three second compensation capacitors, and the output voltage of the S-LCC topology network is proportional to the offset.

[0085] It should be noted that the detuning parameter design method of this embodiment is implemented in the LCC-S and S-LCC topology circuits of the wireless power transmission system, that is, a hybrid compensation circuit, and the circuit topology structure includes a DC power supply, an inverter circuit, a transmitter compensation network, a transmitting and receiving coil, a receiving compensation network, a rectifier circuit, an output filter capacitor and a load. Among them, the DC power supply is connected in series with the inverter circuit, and the inverter circuit is composed of a first MOSFET switch tube and a second MOSFET switch tube to form a first bridge arm; the third MOSFET switch tube and the fourth MOSFET switch tube constitute the second bridge arm. The hybrid compensation network is connected in a dual compensation topology cascade manner.

[0086] From the perspective of the compensation network, the hybrid compensation network includes a primary compensation network and a secondary compensation network. The primary side is the transmitter compensation network, and the secondary side is the receiver compensation network. Moreover, the transmitter compensation is connected in parallel, and the receiver compensation is connected in series. If described from the perspective of the topological structure, the hybrid compensation network can be divided into the upper part of the LCC-S topological network and the lower part of the S-LCC topological network. Both the upper and lower topological networks can be divided into the transmitter and the receiver, which are connected to each other through the transmitter coil and the receiver coil. The overall hybrid compensation network is connected in parallel with the transmitter of the inverter circuit and in series with the receiver of the rectifier circuit.

[0087] Specifically, the transmitter compensation network and the receiver compensation network of the LCC-S topology network include a first compensation inductor and three first compensation capacitors , , , the first compensation capacitor In the receiving end compensation network. The transmitter end compensation network and the receiving end compensation network of the S-LCC topology network include a second compensation inductor and three second compensation capacitors , , , the second compensation capacitor In the transmitter compensation network.

[0088] The rectifier circuit is composed of 4 symmetrical fast recovery diodes, which are also connected by two diodes to form a bridge arm to generate two bridge arms. For load In addition, in the hybrid compensation topology composed of the LCC-S topology network and the S-LCC topology network, the output voltage of the LCC-S topology network is inversely proportional to the offset, and the output voltage of the S-LCC topology network is directly proportional to the offset; when the system is offset, the fluctuation of the output voltage can be smoothed to achieve the system's anti-offset.

[0089] It should be noted that, in this embodiment, before the detuning parameters are designed based on the above topological circuit structure, all devices are considered to be ideal devices, assuming that stray parameters and internal resistance do not exist; both the transmitting and receiving ends do not reach a quasi-resonant state.

[0090] See also Figure 2 , methods include:

[0091] Step 101: Analyze the hybrid compensation circuit using a fundamental wave approximation method to obtain a hybrid compensation equivalent circuit, where the hybrid compensation equivalent circuit includes an LCC-S equivalent circuit and an S-LCC equivalent circuit.

[0092] See also Figure 3 Based on the filtering characteristics of the compensation network topology, this embodiment uses the fundamental wave approximation method to simplify the hybrid compensation circuit proposed above and obtain the hybrid compensation equivalent circuit. It can be found that Figure 3 The hybrid compensation equivalent circuit in can be divided into two loops: LCC-S equivalent loop and S-LCC equivalent loop. The output of the LCC-S equivalent loop is , the output of the S-LCC equivalent circuit is ; The equivalent loop output of the whole system can be expressed as ; Similarly, input voltage and load can be expressed in this way.

[0093] Step 102: introduce a detuning coefficient, perform a detuning simplified analysis on the LCC-S equivalent circuit, and construct an LCC-S tuning parameter expression formula, which includes an LCC-S output power expression and an LCC-S extreme mutual inductance value expression.

[0094] Furthermore, step 102 includes:

[0095] The detuning coefficient is introduced to simplify the detuning analysis of the LCC-S equivalent circuit, and the expression of the LCC-S equivalent input impedance is obtained.

[0096] According to the LCC-S equivalent input impedance expression, the first compensation inductance when the LCC-S equivalent input impedance presents pure resistance is analyzed;

[0097] Calculate the LCC-S output power expression according to the first compensation inductance and the first mutual inductance value;

[0098] Based on the LCC-S output power expression, the mutual inductance derivative analysis is performed to obtain the LCC-S extreme mutual inductance value expression.

[0099] Step 103: By adjusting the detuning coefficient, based on the LCC-S output power expression and the LCC-S extreme mutual inductance expression, the detuning coefficient corresponding to the LCC-S mutual inductance value obtained when the LCC-S output power derivative value is 0 is selected as the target detuning coefficient.

[0100] It should be noted that this embodiment introduces a detuning coefficient on the receiving side of the LCC-S equivalent loop and Inductance With capacitor Capacitance at full resonance The standard capacitance value is:

[0101]

[0102] in, is the resonant frequency. The detuning parameter after the detuning coefficient is introduced is Expressed as:

[0103]

[0104] In order to simplify the calculation and analysis, the inductance in the LCC-S equivalent circuit is calculated based on the mutual inductance theory. and capacitor It is equivalent to a short circuit, and the inductor With capacitor Equivalent to , so the simplified equivalent circuit can be obtained Figure 4 Based on this circuit topology, the resonance condition of the LCC-S loop can be obtained:

[0105]

[0106]

[0107] At this time, the equivalent impedance of the receiving end converted to the transmitting end is Expressed as:

[0108]

[0109] in, is the mutual inductance value of the LCC-S equivalent circuit, which can be recorded as the first mutual inductance value; is the load of the LCC-S equivalent circuit. At this time, the capacitor And the equivalent impedance In parallel, assuming that the impedance of the two in parallel is expressed as , then the equivalent input impedance of the system is Expressed as:

[0110]

[0111] Then the overall input equivalent impedance of the LCC-S equivalent circuit area is , that is, the LCC-S equivalent input impedance expression is:

[0112]

[0113] To ensure the equivalent input impedance of the LCC-S equivalent circuit, that is, the LCC-S equivalent input impedance To be purely resistive, the following conditions must be met:

[0114]

[0115] Then based on the above formula, we can get the first compensation inductance :

[0116]

[0117] According to the series-parallel relationship of each branch, it is not difficult to determine the current value of each branch:

[0118]

[0119]

[0120]

[0121] in, is the resonant frequency, is the input voltage of the LCC-S equivalent circuit. Then the output power of the LCC-S equivalent circuit can be expressed by the LCC-S output power expression:

[0122]

[0123] Based on the above formula, the first mutual inductance value Take the derivative and set it to 0:

[0124]

[0125] Then the expression of LCC-S extreme mutual inductance corresponding to the maximum output power of LCC-S is:

[0126]

[0127] That is, the extreme mutual inductance value corresponding to the moment when the output power is the extreme value. This embodiment takes this as the goal of optimizing the detuning coefficient, that is, adjusting the detuning coefficient , so that when the system's LCC-S is at maximum output power, the first mutual inductance value of the LCC-S loop Can reach extreme mutual inductance value That is, the detuning coefficient at this time is the target detuning coefficient of the hybrid topology structure to be designed.

[0128] Step 104: Perform mathematical analysis of detuning conditions on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient, and generate a circuit total output power expression and a power fluctuation expression.

[0129] Furthermore, step 104 includes:

[0130] Calculate the S-LCC equivalent input impedance when the LCC-S equivalent circuit and the S-LCC equivalent circuit meet the preset resonance condition according to the detuning parameters;

[0131] Analyze the second compensation inductance when the S-LCC equivalent input impedance is purely resistive;

[0132] Calculate the S-LCC output power expression according to the second compensation inductance and the second mutual inductance value, wherein the second mutual inductance value is determined according to the coupling coefficient;

[0133] According to the coupling coefficient, LCC-S output power expression and S-LCC output power expression, topological coupling analysis is performed to obtain the total output power expression of the circuit;

[0134] The coupling coefficient is derived and analyzed based on the total output power expression of the circuit, and the output power fluctuation analysis is performed according to the preset coupling range to obtain the power fluctuation expression.

[0135] Step 105: With the goal of minimizing power fluctuation, an optimization calculation is performed based on the total output power expression of the circuit and the power fluctuation expression to obtain a target detuning parameter.

[0136] It should be noted that after analyzing the LCC-S topology network, the S-LCC topology network can also be analyzed by circuit simplification. Figure 5 , the inductor and capacitor Assuming it is a short circuit, the inductor and capacitor Equivalent to , then the preset resonance condition at the receiving end of the S-LCC equivalent circuit can be expressed as:

[0137]

[0138]

[0139] At the same time, in order to realize that the input of the S-LCC equivalent circuit is purely resistive, the primary transmitting network should also be purely resistive, so its preset resonance condition must meet the following conditions:

[0140]

[0141] When the compensation network at the receiving end is in the tuning state, the secondary side equivalent impedance Expressed as:

[0142]

[0143] If the impedance of the secondary side is equivalent to that of the primary side, then the equivalent input impedance of the S-LCC is Expressed as:

[0144]

[0145] in, is the mutual inductance value of the S-LCC equivalent circuit, that is, the second mutual inductance value.

[0146] To ensure the S-LCC equivalent input impedance of the S-LCC equivalent circuit To be purely resistive, the following conditions must be met:

[0147]

[0148] Then the second compensation inductance can be obtained Expressed as:

[0149]

[0150] According to the series-parallel relationship of each branch, the current value of each branch can be determined:

[0151]

[0152]

[0153]

[0154] From this, we can get the output power expression of the S-LCC equivalent circuit, that is, the S-LCC output power expression:

[0155]

[0156] Since the parameter design of this embodiment aims to ensure that the coupling coefficient of the system is within a certain range, the total output power of the system can be ensured to be stable, that is, the total output power of the circuit The fluctuation rate is minimized within the preset coupling range. The preset coupling range of this embodiment is expressed as ,and ,in, is the proportionality coefficient, , They are respectively the minimum and maximum values ​​of the value range of the coupling coefficient, which can be set according to actual conditions and are not limited here. , They represent the total output power of the system corresponding to the moment of the extreme value of the coupling coefficient, and the total output power of the system can be obtained and coupling coefficient The relationship is as follows Figure 6 , 7 , as shown in Figure 8.

[0157] like For any coupling coefficient value within the preset coupling range, it is not difficult to Figure 6 , 7 , 8, we can see that Figure 7 The total system output power is The volatility is minimal, that is:

[0158] when Total system output power The volatility is minimal, then:

[0159]

[0160] Then combine the above formula with , we can get the power fluctuation expression:

[0161]

[0162] in, Indicates the output power fluctuation rate.

[0163] From the analysis of the entire hybrid equivalent circuit, in order to minimize the fluctuation of the system output power within a certain coupling coefficient range, this embodiment will configure a suitable coupling coefficient K. Based on the coupling coefficient, the first mutual inductance value can be expressed as and the second mutual inductance :

[0164]

[0165]

[0166]

[0167] Among them, the last formula is the first mutual inductance value and the second mutual inductance The linear relationship of , The proportional parameters are determined by the mutual inductance coils actually used in the two circuits. The specific values ​​are determined according to the actual coil conditions. , are the coupling coefficient of the LCC-S equivalent circuit and the coupling coefficient of the S-LCC equivalent circuit respectively; , The parameters determined by the mutual inductance coils in the two loops are determined according to the specific coil conditions; the coupling mechanism of this embodiment adopts the DDQ combined coil. Combined with the LCC-S output power expression and the S-LCC output power expression calculated in the LCC-S and S-LCC equivalent loop analysis, and the first mutual inductance value solved according to the coupling coefficient and the second mutual inductance The relationship between the output power and coupling coefficient of the two loops can be obtained:

[0168]

[0169]

[0170] The two loop topologies are connected in series at the receiving end, so the total output power of the circuit can be expressed as:

[0171]

[0172] Total output power Coupling coefficient Take the derivative and set it to 0:

[0173]

[0174] At this time, the corresponding LCC-S coupling coefficient when the total output power reaches the maximum value can be obtained :

[0175]

[0176] The dual compensation network channels are connected in parallel to the output end of the inverter circuit. Figure 3 The output voltage of the inverter circuit is For a square wave, After Fourier decomposition, it can be expressed as:

[0177]

[0178] The equivalent resistance of each receiving end compensation circuit can be expressed as:

[0179]

[0180] According to Ohm's law, combined with the above formula, the voltage of each channel before the input rectifier circuit can be obtained:

[0181]

[0182] From the above formula, we can see that the output voltage of channel 1 LCC-S compensation topology is Mutual Inductance In direct proportion, that is, when the offset of the receiving coil increases, the output voltage decreases as the mutual inductance decreases; the output voltage of the channel 2 S-LCC compensation topology Mutual Inductance Inversely proportional, that is, when the offset of the receiving coil increases, the output voltage increases as the mutual inductance decreases. The two channels are connected in series at the receiving end, and the input voltage of the rectifier circuit can be expressed as:

[0183]

[0184] Considering the fundamental voltage component, the relationship between the input voltage and output voltage of the rectifier circuit can be expressed as:

[0185]

[0186] Combining formulas formula, The formula and the above formula give the DC output voltage of the receiving end rectifier circuit as:

[0187]

[0188] in, is the input voltage of the inverter circuit, It is the total DC output voltage of the rectifier circuit at the receiving end of the system.

[0189] From the above formula, we can see that the voltage gain of the system for:

[0190]

[0191] According to this voltage gain The formula can establish the connection between the two compensation networks. If the detuning coefficient A is finally determined, it can be used to set the voltage gain. Afterwards, the specific mutual inductance is calculated according to this formula.

[0192] according to Figure 7 It can be seen that within the preset coupling range, the output power fluctuation rate of the system can be minimized. With the goal of minimizing the system output power fluctuation rate, we can trace back to the calculation formulas above until we select the appropriate detuning parameters. , which is the target detuning parameter. It can be understood that the detuning parameter is , and can also include detuning coefficients based on Or the detuning parameter Other calculated power flow parameters, that is, circuit parameters affected by the detuning coefficient, such as other inductors, capacitors, output voltages, output currents, output powers, etc. in the compensation network, are only used as examples and are not limited here.

[0193] For ease of understanding, the present application proposes a practical application example of a parameter design method for a hybrid compensation network for detuned wireless power transmission that is resistant to offset. Please refer to Table 1 for parameter design indicators.

[0194] Table 1 System indicator parameter examples

[0195]

[0196] Detuning coefficients using iterative optimization and detuning parameters Select, and the detuning coefficient is , detuning parameter Substituting the obtained detuning coefficient and detuning parameter into the important parameter formula above, other parameters of the system can be obtained, see Table 2.

[0197] Table 2 Other parameter values ​​of circuit system

[0198]

[0199] The system is also simulated under rated operating conditions, and the output voltage and output current are obtained. Fig. 9 , the simulation results show that under load Yes, the system output voltage and output current Keep stable output voltage About 401.36V, output current About 8.28A, the total output power of the circuit It is about 3323.3W, which is within the required design range, that is, the system achieves stable output based on the designed detuning parameters and detuning coefficients.

[0200] The method for designing parameters of a hybrid compensation network for detuned wireless power transmission that is resistant to offset provided in the embodiment of the present application introduces a detuning coefficient into a hybrid topology circuit with anti-offset capability, namely a hybrid compensation circuit; the LCC-S topology network and the S-LCC topology network in the hybrid compensation network can smooth the fluctuation of the output voltage when a system offset occurs, thereby realizing system anti-offset. In the specific parameter design process, a detuning condition is set for the topology structure and a detuning coefficient is introduced, thereby realizing a mathematical analysis of the system under the detuning condition, and based on some power flow parameters for the stable operation of the system, the optimization of the detuning coefficient and the detuning parameter is constrained, and the detuning coefficient is continuously adjusted to obtain the target detuning coefficient and parameters; this process fully considers the impact of detuning on the system output, and can ensure that the system can still maintain a stable output in the case of detuning, thereby improving the system's anti-offset capability. Therefore, the embodiment of the present application can solve the technical problem that the existing hybrid topology parameter design depends on the system resonance state, cannot control the output fluctuation in the case of detuning, and leads to a weak system anti-offset capability.

[0201] For easier understanding, see Fig.10 , the present application provides an embodiment of a device for designing parameters of a hybrid compensation network for detuned wireless power transmission with an anti-drift, the device is implemented based on a hybrid compensation circuit, the hybrid compensation circuit includes: an inverter circuit, a hybrid compensation network and a rectifier circuit;

[0202] The inverter circuit includes two bridge arms composed of four MOSFET switch tubes;

[0203] The hybrid compensation network includes the primary compensation network and the secondary compensation network, which can be divided into LCC-S topology network and S-LCC topology network according to the topology structure;

[0204] The rectifier circuit includes two bridge arms formed by four symmetrical diodes;

[0205] The hybrid compensation network is connected in parallel with the transmitting end of the inverter circuit and in series with the receiving end of the rectifier circuit;

[0206] The device includes:

[0207] A circuit equivalent unit 201 is used to analyze the hybrid compensation circuit by using a fundamental wave approximation method to obtain a hybrid compensation equivalent circuit, wherein the hybrid compensation equivalent circuit includes an LCC-S equivalent circuit and an S-LCC equivalent circuit;

[0208] A detuning analysis unit 202 is used to introduce a detuning coefficient, perform a detuning simplified analysis on the LCC-S equivalent circuit, and construct an LCC-S tuning parameter expression formula, wherein the LCC-S tuning parameter expression formula includes an LCC-S output power expression and an LCC-S extreme mutual inductance value expression;

[0209] A coefficient design unit 203 is used to select a detuning coefficient corresponding to the LCC-S mutual inductance value obtained when the LCC-S output power derivative value is 0 as a target detuning coefficient based on the LCC-S output power expression and the LCC-S extreme mutual inductance value expression by adjusting the detuning coefficient;

[0210] The condition analysis unit 204 is used to perform a detuning condition mathematical analysis on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient, and generate a circuit total output power expression and a power fluctuation expression;

[0211] The parameter determination unit 205 is used to optimize and calculate the target detuning parameter according to the total output power expression of the circuit and the power fluctuation expression with the goal of minimizing the power fluctuation.

[0212] Furthermore, the primary compensation network and the secondary compensation network in the hybrid compensation network are connected in a dual compensation topology cascade manner, and an LCC-S topology network and an S-LCC topology network are generated in a topology structure in which the primary compensation is connected in parallel and the secondary compensation is connected in series.

[0213] The LCC-S topology network includes a first compensation inductor and three first compensation capacitors, and the output voltage of the LCC-S topology network is inversely proportional to the offset;

[0214] The S-LCC topology network includes a second compensation inductor and three second compensation capacitors, and the output voltage of the S-LCC topology network is proportional to the offset.

[0215] Further, the detuning analysis unit 202 is specifically configured to:

[0216] The detuning coefficient is introduced to simplify the detuning analysis of the LCC-S equivalent circuit, and the expression of the LCC-S equivalent input impedance is obtained.

[0217] According to the LCC-S equivalent input impedance expression, the first compensation inductance when the LCC-S equivalent input impedance presents pure resistance is analyzed;

[0218] Calculate the LCC-S output power expression according to the first compensation inductance and the first mutual inductance value;

[0219] Based on the LCC-S output power expression, the mutual inductance derivative analysis is performed to obtain the LCC-S extreme mutual inductance value expression.

[0220] Further, the condition analysis unit 204 is specifically used for:

[0221] Calculate the S-LCC equivalent input impedance when the LCC-S equivalent circuit and the S-LCC equivalent circuit meet the preset resonance condition according to the detuning parameters;

[0222] Analyze the second compensation inductance when the S-LCC equivalent input impedance is purely resistive;

[0223] Calculate the S-LCC output power expression according to the second compensation inductance and the second mutual inductance value, wherein the second mutual inductance value is determined according to the coupling coefficient;

[0224] According to the coupling coefficient, LCC-S output power expression and S-LCC output power expression, topological coupling analysis is performed to obtain the total output power expression of the circuit;

[0225] The coupling coefficient is derived and analyzed based on the total output power expression of the circuit, and the output power fluctuation analysis is performed according to the preset coupling range to obtain the power fluctuation expression.

[0226] The present application also provides a device for designing parameters of a hybrid compensation network for detuned wireless power transmission with resistance to deviation, the device comprising a processor and a memory;

[0227] The memory is used to store the program code and transmit the program code to the processor;

[0228] The processor is used to execute the method for designing parameters of a hybrid compensation network for detuned wireless power transmission with resistance to offset in the above method embodiment according to the instructions in the program code.

[0229] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0230] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0231] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0232] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions for executing all or part of the steps of the method described in each embodiment of the present application through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0233] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-drift, characterized in that: The method is implemented based on a hybrid compensation circuit, which includes: an inverter circuit, a hybrid compensation network and a rectifier circuit; The inverter circuit includes two bridge arms formed by four MOSFET switch tubes; The hybrid compensation network includes a primary compensation network and a secondary compensation network, which are divided into an LCC-S topology network and an S-LCC topology network according to the topology structure; The rectifier circuit includes two bridge arms formed by four symmetrical diodes; The hybrid compensation network is connected in parallel with the transmitting end of the inverter circuit and in series with the receiving end of the rectifier circuit; The method comprises: The hybrid compensation circuit is analyzed by using a fundamental wave approximation method to obtain a hybrid compensation equivalent circuit, wherein the hybrid compensation equivalent circuit includes an LCC-S equivalent circuit and an S-LCC equivalent circuit; A detuning coefficient is introduced to simplify the detuning analysis of the LCC-S equivalent circuit, and an LCC-S tuning parameter expression formula is constructed, wherein the LCC-S tuning parameter expression formula includes an LCC-S output power expression and an LCC-S extreme mutual inductance value expression; By adjusting the detuning coefficient, based on the LCC-S output power expression and the LCC-S extreme mutual inductance expression, the detuning coefficient corresponding to the LCC-S mutual inductance value obtained when the LCC-S output power derivative value is 0 is selected as the target detuning coefficient; Performing mathematical analysis of detuning conditions on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient, generating a circuit total output power expression and a power fluctuation expression; With the goal of minimizing power fluctuation, an optimization calculation is performed based on the total output power expression of the circuit and the power fluctuation expression to obtain a target detuning parameter.

2. The method for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-drift according to claim 1, characterized in that: The first MOSFET switch tube and the second MOSFET switch tube in the inverter circuit form a first bridge arm; The third MOSFET switch tube and the fourth MOSFET switch tube form a second bridge arm.

3. The method for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-drift according to claim 1, characterized in that: The primary compensation network and the secondary compensation network in the hybrid compensation network are connected in a dual compensation topology cascade manner, and an LCC-S topology network and an S-LCC topology network are generated in a topology structure in which the primary compensation is in parallel and the secondary compensation is in series. The LCC-S topology network includes a first compensation inductor and three first compensation capacitors, and the output voltage of the LCC-S topology network is inversely proportional to the offset; The S-LCC topology network includes a second compensation inductor and three second compensation capacitors, and the output voltage of the S-LCC topology network is proportional to the offset.

4. The method for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-deviation according to claim 1, characterized in that: The detuning coefficient is introduced to perform detuning simplification analysis on the LCC-S equivalent circuit, and an expression formula for LCC-S tuning parameters is constructed, including: The detuning coefficient is introduced to perform a detuning simplified analysis on the LCC-S equivalent circuit, and an expression for the LCC-S equivalent input impedance is obtained; Analyze the first compensation inductance when the LCC-S equivalent input impedance presents pure resistance according to the LCC-S equivalent input impedance expression; Calculating an LCC-S output power expression according to the first compensation inductance and the first mutual inductance value; The mutual inductance derivative analysis is performed according to the LCC-S output power expression to obtain the LCC-S extreme mutual inductance value expression.

5. The method for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-deviation according to claim 1, characterized in that: The method of performing a mathematical analysis of detuning conditions on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient to generate a circuit total output power expression and a power fluctuation expression includes: Calculating the S-LCC equivalent input impedance when the LCC-S equivalent circuit and the S-LCC equivalent circuit meet a preset resonance condition according to the detuning parameter; Analyze the second compensation inductance when the S-LCC equivalent input impedance presents pure resistance; Calculating an S-LCC output power expression according to the second compensation inductance and the second mutual inductance value, wherein the second mutual inductance value is determined according to a coupling coefficient; Perform topological coupling analysis according to the coupling coefficient, the LCC-S output power expression and the S-LCC output power expression to obtain a total output power expression of the circuit; The coupling coefficient is derived and analyzed based on the total output power expression of the circuit, and the output power fluctuation analysis is performed according to a preset coupling range to obtain a power fluctuation expression.

6. A device for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-deviation, characterized in that: The device is implemented based on a hybrid compensation circuit, which includes: an inverter circuit, a hybrid compensation network and a rectifier circuit; The inverter circuit includes two bridge arms formed by four MOSFET switch tubes; The hybrid compensation network includes a primary compensation network and a secondary compensation network, which are divided into an LCC-S topology network and an S-LCC topology network according to the topology structure; The rectifier circuit includes two bridge arms formed by four symmetrical diodes; The hybrid compensation network is connected in parallel with the transmitting end of the inverter circuit and in series with the receiving end of the rectifier circuit; The device comprises: A circuit equivalent unit, used for analyzing the hybrid compensation circuit by adopting a fundamental wave approximation method to obtain a hybrid compensation equivalent circuit, wherein the hybrid compensation equivalent circuit includes an LCC-S equivalent circuit and an S-LCC equivalent circuit; A detuning analysis unit, used for introducing a detuning coefficient, performing a detuning simplified analysis on the LCC-S equivalent circuit, and constructing an LCC-S tuning parameter expression formula, wherein the LCC-S tuning parameter expression formula includes an LCC-S output power expression and an LCC-S extreme mutual inductance value expression; A coefficient design unit, configured to select, by adjusting the detuning coefficient, a detuning coefficient corresponding to the LCC-S mutual inductance value obtained when the LCC-S output power derivative value is 0 as a target detuning coefficient based on the LCC-S output power expression and the LCC-S extreme mutual inductance value expression; A conditional analysis unit, used for performing a detuning condition mathematical analysis on the LCC-S equivalent circuit and the S-LCC equivalent circuit according to the detuning parameter and the coupling coefficient, and generating a circuit total output power expression and a power fluctuation expression; The parameter determination unit is used to optimize and calculate the target detuning parameter according to the total output power expression of the circuit and the power fluctuation expression with the goal of minimizing the power fluctuation.

7. The device for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-deviation according to claim 6, characterized in that: The primary compensation network and the secondary compensation network in the hybrid compensation network are connected in a dual compensation topology cascade manner, and an LCC-S topology network and an S-LCC topology network are generated in a topology structure in which the primary compensation is in parallel and the secondary compensation is in series. The LCC-S topology network includes a first compensation inductor and three first compensation capacitors, and the output voltage of the LCC-S topology network is inversely proportional to the offset; The S-LCC topology network includes a second compensation inductor and three second compensation capacitors, and the output voltage of the S-LCC topology network is proportional to the offset.

8. The device for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-deviation according to claim 6, characterized in that: The detuning analysis unit is specifically used for: The detuning coefficient is introduced to perform a detuning simplified analysis on the LCC-S equivalent circuit, and an expression for the LCC-S equivalent input impedance is obtained; Analyze the first compensation inductance when the LCC-S equivalent input impedance presents pure resistance according to the LCC-S equivalent input impedance expression; Calculating an LCC-S output power expression according to the first compensation inductance and the first mutual inductance value; The mutual inductance derivative analysis is performed according to the LCC-S output power expression to obtain the LCC-S extreme mutual inductance value expression.

9. The device for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-deviation according to claim 6, characterized in that: The condition analysis unit is specifically used for: Calculating the S-LCC equivalent input impedance when the LCC-S equivalent circuit and the S-LCC equivalent circuit meet a preset resonance condition according to the detuning parameter; Analyze the second compensation inductance when the S-LCC equivalent input impedance presents pure resistance; Calculating an S-LCC output power expression according to the second compensation inductance and the second mutual inductance value, wherein the second mutual inductance value is determined according to a coupling coefficient; Perform topological coupling analysis according to the coupling coefficient, the LCC-S output power expression and the S-LCC output power expression to obtain a total output power expression of the circuit; The coupling coefficient is derived and analyzed based on the total output power expression of the circuit, and the output power fluctuation analysis is performed according to a preset coupling range to obtain a power fluctuation expression.

10. A device for designing parameters of a hybrid compensation network for detuned wireless power transmission with anti-deviation, characterized in that: The device comprises a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the method for designing parameters of a hybrid compensation network for detuned wireless power transmission with resistance to offset according to the instructions in the program code according to any one of claims 1 to 5.

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