Inverter ZVS Regulation Method, Device, Electronic Device and Medium

Abstract

The present invention provides an inverter ZVS control method, device, electronic device and medium. The method includes: under the condition of parameter variation of the wireless power transmission system, adjusting the inverter parameters to achieve the control of inverter ZVS; wherein, the parameters of the wireless power transmission system include one or more of the following parameters: compensation parameters; mutual inductance parameters; load parameters; the inverter parameters include one or more of the following parameters: operating frequency; phase shift angle. The inverter ZVS control method, device, electronic device and medium provided by the present invention achieve the control of inverter ZVS by adjusting the inverter parameters, and solve the problem in the prior art that ZVS cannot be achieved under the conditions of wide output power, deviation of coupling and compensation parameters.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission systems, and in particular, to a method and device for regulating zero voltage switching (ZVS) of an inverter, an electronic device, and a medium. Background Art

[0002] Switching devices are important components in wireless power transmission systems. If the switching devices do not operate in soft-switching mode, on the one hand, it will lead to an increase in device switching losses and reduce the system transmission efficiency. On the other hand, it will cause a large impact at the moment of turn-on, increasing electromagnetic interference, and when the voltage impact is severe, it may cause device damage. Therefore, realizing zero voltage turn-on (Zero Voltage Soft Switching, ZVS) operation of the inverter is a hot research topic in wireless power transmission systems.

[0003] In the prior art, there are mainly two ways to achieve ZVS operation of the inverter. One is to monitor the phase of the output voltage and current of the inverter in real time and maintain the phase difference between the voltage and current by adjusting the frequency and other methods. However, due to the coupling and compensation mechanism of the wireless power transmission system being a high-order non-linear system with a frequency bifurcation effect, the method of sweeping the frequency to achieve ZVS may cause the system to operate at the frequency bifurcation point, resulting in abnormal system operation. The second way is to add a clamping circuit to make there be a phase difference between the output voltage and current of the inverter. Although this method avoids frequency adjustment, the clamping circuit composed of discrete components has poor adaptability and cannot achieve ZVS under the conditions of wide output power, coupling, and compensation parameter deviations. Summary of the Invention

[0004] The present invention provides a method and device for regulating ZVS of an inverter, an electronic device, and a medium, which are used to solve the technical problem that the prior art cannot achieve ZVS under the conditions of wide output power, coupling, and compensation parameter deviations.

[0005] In a first aspect, the present invention provides a method for regulating ZVS of an inverter, including:

[0006] Under the condition of parameter changes in the wireless power transmission system, the ZVS of the inverter is regulated by adjusting the inverter parameters;

[0007] Among them, the wireless power transmission system parameters include one or more of the following parameters:

[0008] Compensation parameters;

[0009] Mutual inductance parameters;

[0010] Load parameters;

[0011] The inverter parameters include one or more of the following parameters:

[0012] Operating frequency;

[0013] Phase shift angle.

[0014] In some embodiments, by adjusting the inverter parameters, the ZVS control of the inverter is achieved, including:

[0015] By adjusting the operating frequency of the inverter, the ZVS control of the inverter is achieved.

[0016] In some embodiments, by adjusting the inverter parameters, the ZVS control of the inverter is achieved, including:

[0017] By adjusting the phase shift angle of the inverter, the ZVS control of the inverter is achieved.

[0018] In some embodiments, by adjusting the inverter parameters, the ZVS control of the inverter is achieved, including:

[0019] By adjusting the operating frequency of the inverter and the phase shift angle of the inverter, the ZVS control of the inverter is achieved.

[0020] In a second aspect, the present invention further provides an inverter ZVS control device, including:

[0021] A control module for achieving the ZVS control of the inverter by adjusting the inverter parameters under the condition that the parameters of the wireless power transmission system change;

[0022] Wherein, the parameters of the wireless power transmission system include one or more of the following parameters:

[0023] Compensation parameters;

[0024] Mutual inductance parameters;

[0025] Load parameters;

[0026] The inverter parameters include one or more of the following parameters:

[0027] Operating frequency;

[0028] Phase shift angle.

[0029] In some embodiments, the control module is specifically configured to:

[0030] By adjusting the operating frequency of the inverter, the ZVS control of the inverter is achieved.

[0031] In some embodiments, the control module is specifically configured to:

[0032] By adjusting the phase shift angle of the inverter, the ZVS control of the inverter is achieved.

[0033] In some embodiments, the control module is specifically configured to:

[0034] By adjusting the operating frequency of the inverter and the phase shift angle of the inverter, the zero-voltage switching (ZVS) control of the inverter is achieved.

[0035] In a third aspect, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the ZVS control method of the inverter as described in any one of the first aspects above is implemented.

[0036] In a fourth aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the ZVS control method of the inverter as described in any one of the first aspects above is implemented.

[0037] The ZVS control method, device, electronic device, and medium provided by the present invention achieve the ZVS control of the inverter by adjusting the inverter parameters, and solve the technical problem in the prior art that ZVS cannot be achieved under wide output power, coupling, and compensation parameter deviations. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 is a schematic flowchart of the ZVS control method of the inverter provided by the present invention;

[0040] Figure 2 is a schematic diagram of the output voltage and current of the inverter in the WPT system when the output power is 18 kW and the phase shift angle is π / 2 according to an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of the driving signal, output voltage, and current waveforms of the inverter switch device according to an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of the harmonic waveforms when accumulated to different numbers of times according to an embodiment of the present invention;

[0043] Figure 5 is a schematic flowchart of achieving ZVS by frequency adjustment according to an embodiment of the present invention;

[0044] Figure 6 is a schematic flowchart of achieving ZVS by phase shift angle adjustment according to an embodiment of the present invention;

[0045] Figure 7It is a schematic diagram of the ZVS process realized by adjusting the frequency and phase shift angle provided by an embodiment of the present invention;

[0046] Figure 8 It is a schematic structural diagram of an inverter ZVS control device provided by the present invention;

[0047] Figure 9 It is a schematic structural diagram of an electronic device provided by the present invention. Detailed implementation manners

[0048] In the prior art, there are mainly two ways to achieve ZVS operation of an inverter. One is to monitor the phase of the output voltage and current of the inverter in real time and maintain the phase difference between the voltage and current by adjusting the frequency and other methods. However, due to the coupling and compensation mechanism of the wireless power transmission system being a high-order nonlinear system with a frequency bifurcation effect, the method of sweeping the frequency to achieve ZVS may cause the system to work at the frequency bifurcation point, resulting in abnormal system operation. The second way is to add a clamping circuit to make there be a phase difference between the output voltage and current of the inverter. Although this method avoids frequency adjustment, the clamping circuit composed of discrete components has poor adaptability and cannot achieve ZVS under the conditions of wide output power, coupling, and compensation parameter deviations.

[0049] Based on the above technical problems, in order to achieve ZVS operation of the inverter within a wide power and wide parameter deviation range, an embodiment of the present invention obtains the switch moment current expression through derivation, obtains the relationship between the ZVS operation state of the inverter and parameters such as output power, phase shift angle, and frequency, and then directly obtains the frequency and / or phase shift angle for realizing ZVS operation of the inverter through theoretical calculation. By adjusting the inverter frequency and / or phase shift angle, the ZVS control of the inverter is realized, solving the deficiencies brought by the prior art methods.

[0050] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0051] Figure 1 It is a schematic flowchart of an inverter ZVS control method provided by the present invention. As Figure 1 shown, an embodiment of the present application provides an inverter ZVS control method, and the method includes:

[0052] Step 101, under the condition of parameter variation of the wireless power transmission system, realize the ZVS control of the inverter by adjusting the inverter parameters;

[0053] Among them, the wireless power transmission system parameters include one or more of the following parameters:

[0054] Compensation parameters;

[0055] Mutual inductance parameters;

[0056] Load parameters;

[0057] The inverter parameters include one or more of the following parameters:

[0058] Operating frequency;

[0059] Phase-shifting angle.

[0060] Specifically, due to the complex variability of the coupling and compensation mechanism of the wireless power transmission (WPT) system and the diversity of load requirements, the operating state of the device is easily affected. A good control strategy is the key to maintaining the stable ZVS operation of the WPT system inverter. In the embodiments of the present invention, a mathematical model of the system circuit characteristics considering the coupling and resonance parameters, the operating frequency of the inverter, and the change of the phase-shifting angle is first established, the non-linear behavior of the current at the turn-on moment of the inverter is analyzed within a wide range of parameter changes, and the influence rules and their coupling relationships of the control method and circuit parameters on the system characteristics and the operating state of the inverter are studied. Further, a ZVS real-time control strategy based on parameter estimation is proposed to achieve the stable ZVS operation of the WPT system inverter within a wide power and wide parameter range. Theoretical analysis and experimental results verify the effectiveness of the proposed strategy.

[0061] When the coupling and compensation parameters change, the operating state of the WPT system deviates from the rated working condition, and the ZVS operating characteristics may change. Therefore, an efficient and stable control strategy is crucial. Before formulating the control strategy, it is necessary to first study the mechanism by which the control variables affect the circuit characteristics. The operating frequency and phase-shifting angle of the primary inverter are often used for system real-time control. On the basis of considering the deviation of the coupling and compensation parameters, in the embodiments of the present invention, a mathematical model of the fundamental wave current and harmonic current output by the inverter in the case of variable frequency and variable phase-shifting angle will be first established, and then the influence rules of the control method and the deviation of the coupling and compensation parameters on the operating state of the system inverter device will be analyzed.

[0062] The ideal resonant frequency of the system is represented by ω 0 and k ω represents the ratio of the secondary resonant frequency to the ideal resonant frequency, and k ω2 represents the ratio of the actual operating frequency to the secondary resonant frequency, that is, there is the following relationship:

[0063]

[0064] k M represents the ratio of the true value of the mutual inductance to the ideal value, kR It represents the ratio of the true value to the rated value of the load resistance, k Lr It represents the change coefficient of the compensation inductor. According to Kirchhoff's voltage law, the circuit equation of the nth harmonic of the LCC-S compensated WPT system is written as follows:

[0065]

[0066] Among them, u P-n represents the true value of the nth harmonic of the inverter input voltage, L r represents the primary series compensation inductor, C r represents the primary parallel compensation capacitor, L P represents the self-inductance of the primary coil, L S represents the self-inductance of the secondary coil, C P represents the primary series compensation capacitor, C S represents the secondary series compensation capacitor, M represents the mutual inductance, R E represents the equivalent load resistance, i in-n represents the true value of the nth harmonic of the primary inverter output current, i P-n represents the true value of the nth harmonic of the primary coil current, i S-n represents the true value of the nth harmonic of the secondary coil current.

[0067] The expression of the current on the secondary side of the coupling mechanism when the frequency, phase shift angle, coupling, and compensation parameters deviate is as follows:

[0068]

[0069] Among them,

[0070]

[0071] For the LCC-S compensation topology, when n is equal to 1, the fundamental wave i of the inverter output current under the condition of parameter deviation in-1 , the expression is as follows:

[0072]

[0073] Among them, g n1 represents the intermediate variable, U in represents the input voltage of the inverter, L r0 represents the ideal value of the compensation inductor.

[0074] g n1 The expression is as follows:

[0075]

[0076] When n ≥ 3, the high-order harmonic i of the inverter output current in-n, the expression is as follows:

[0077]

[0078] Among them, g nn is an intermediate variable, and the expression is as follows:

[0079]

[0080]

[0081] If it is assumed that formula (10) holds, then formula (8) can be simplified to the extremely simple form shown in formula (11):

[0082]

[0083]

[0084] According to the characteristics of the LCC-S circuit, L PR is generally not less than 1, and k Lr , k Cr , k CP , k ω and k ω2 are all positive numbers near 1. Therefore, for high-order harmonics, n≥3, it is reasonable to assume that formula (10) holds.

[0085] To make full use of the current-carrying capacity of the device, the phase-shifting angle δ of the inverter is generally set to π during system design. When the parameters are without deviation and the phase-shifting angle is π, the direction of the harmonic current at the turn-on moment of the inverter device is opposite to the voltage direction, that is, the existence of harmonics will be beneficial to the inverter to achieve ZVS operation. When applying the phase-shifting angle control strategy, changing the phase-shifting angle may make the voltage borne by the device at the turn-on moment in the same direction as the fundamental current flowing through it. When the phase-shifting angle is adjusted, the harmonic current at the turn-on moment of the inverter switching device may also be in the same direction as the voltage. This will make the conditions for achieving ZVS operation more complex.

[0086] Figure 2 is the schematic diagram of the output voltage and current of the WPT system inverter when the output power is 18 kW and the phase-shifting angle is π / 2 provided by the embodiment of the present invention. The waveforms of the inverter output voltage and current are as Figure 2 shown. At this time, the fundamental current amplitude at the turn-on moment of the inverter exceeds 60 A, and the inverter cannot operate in the ZVS state.

[0087] It can be seen from formula (7) and formula (11) that when the parameters are deviated, the amplitude of the harmonics is not only related to k Lr and k Cr , but also related to the frequency and / or the phase-shifting angle. This provides a theoretical basis for achieving ZVS operation by adjusting the frequency and / or the phase-shifting angle.

[0088] Figure 3 It is a schematic diagram of the driving signal, output voltage and current waveforms of the inverter switch device provided by an embodiment of the present invention. As shown in Figure 3 For example, taking devices S1 and S3 as examples, to achieve ZVS, the following conditions shown by the following formula need to be satisfied:

[0089]

[0090] where t d represents the dead time, and C oss is the output capacitance of the device. Since the dead time is short, during the time from t 0 to t 0 +t d the output current of the inverter can be regarded as linearly changing, and formula (12) can be further simplified as:

[0091]

[0092] where t 0 =(π - δ) / 2, then adjusting the switching frequency and / or the phase shift angle to satisfy formula (13) can maintain ZVS operation. According to formula (5) and formula (7), the output current of the inverter at time t is:

[0093]

[0094] The result of accumulating all high-order harmonic terms is too complex. Since the harmonic amplitude decreases significantly with the harmonic order, in actual calculation, only the first few harmonic values can be taken for accumulation to simplify the calculation difficulty. Based on the data shown in Figure 2 Figure 4 is a schematic diagram of the harmonic waveforms when accumulating to different orders provided by an embodiment of the present invention. Figure 4 The harmonic waveforms when accumulating to different orders are plotted in it.

[0095] According to Figure 4 it can be seen that only considering the harmonic waveforms from the 3rd to the 11th order already has a high accuracy with the total harmonic current. At the switching moment shown by the dashed line in the figure, the amplitudes of the harmonic currents from the 3rd to the 11th order, from the 3rd to the 21st order, from the 3rd to the 101st order and the total harmonic current are -5.81 A, -6.37 A, -6.84 A and -6.96 A respectively. Based on the total harmonic current, the errors of the currents at the turn-on moments of the first three curves are -16.5%, -8.5% and -1.7% respectively. Therefore, in actual calculation, the harmonic calculation order can be selected as appropriate according to the calculation speed of the controller, the desired accuracy, etc.

[0096] By plotting a contour diagram of the current at the turn-on moment of the inverter switch changing with the frequency and the phase shift angle. For example, the contour interval is 10 A, and when calculating, the rise coefficient k of the compensation capacitor voltage is limited UCr ​, k UCp and k UCs Do not exceed 1.5. Under this parameter constraint, the maximum output power in Case 1 condition is about 20 kW. Among them, the coupling and parameter offset conditions corresponding to Case 1 condition are shown in Table 1.

[0097] Table 1

[0098]

[0099] Under the ideal compensation condition, the secondary resonant frequency is equal to the ideal rated frequency of 85 kHz; under Case 1 condition, the secondary resonant frequency is 81.0 kHz.

[0100] By analyzing the contour diagram, it can be determined that the current at the inverter turn-on moment is affected by multiple factors such as output power, operating frequency, phase shift angle, and compensation parameters.

[0101] When the frequency is low, the current at the turn-on moment decreases as the phase shift angle increases. This is because as the phase shift angle increases, the amplitude of the fundamental wave of the inverter output current at the turn-on moment gradually decreases; when the operating frequency is large, as the phase shift angle increases, the current at the turn-on moment first increases and then decreases, that is, there is a coupling relationship between frequency and phase shift angle.

[0102] Compared with the phase shift angle, except for the edge area, the influence of frequency on the current at the turn-on moment is small. In addition, the coupling and compensation parameters have a significant influence on the ZVS characteristic.

[0103] By analyzing the contour diagram, it can be determined that when the system parameters change from the ideal compensation to the Case 1 condition, the amplitude of the current at the turn-on moment changes significantly.

[0104] On the other hand, by analyzing the contour diagram, it can be determined that even under the condition of deviation of the coupling and compensation parameters, adjusting the frequency and phase shift angle can also change the current at the turn-on moment, making it possible for the inverter to operate in the ZVS state.

[0105] Although theoretically the frequency and / or phase shift angle required for ZVS can be directly calculated according to Equation (14), considering that the analytical formula is relatively complex and the computing power of the controller in the actual system is limited, it is difficult to directly obtain the required frequency and / or phase shift angle. Here, the frequency and / or phase shift angle are discretized, and the optimal frequency and / or phase shift angle are searched by means of traversal optimization. The initial value of the switching frequency is f 0 (f 0 represents the rated operating frequency of the system), the step value is set to f g , and the search range of the operating frequency is set to [f min f max . The initial value of the phase shift angle is δ 0 (δ 0 represents the rated phase shift angle of the system), and the decreasing step value is δg , the search range is [δ min , δ max .

[0106] In the embodiments of the present invention, the current expression at the switching moment is obtained through derivation, and the relationship between the ZVS operating state of the inverter and parameters such as output power, phase shift angle, and frequency is obtained. Furthermore, the frequency and / or phase shift angle for realizing the ZVS operation of the inverter are directly obtained through theoretical calculation. By adjusting the frequency and / or phase shift angle of the inverter, the ZVS regulation of the inverter is realized, and the deficiencies brought by the existing technical methods are solved.

[0107] In some embodiments, the ZVS regulation of the inverter can be realized by adjusting the operating frequency of the inverter. Figure 5 It is a schematic diagram of the ZVS process realized by frequency adjustment provided by the embodiments of the present invention. As Figure 5 shown, the specific steps are as follows:

[0108] Step1: Parameter initialization, obtaining system coupling and compensation parameters through parameter estimation and other methods;

[0109] Step2: Initialize the frequency to f 0 , and initialize the intermediate variables f l and f s to f 0 as well.

[0110] Step3: To ensure that the system maintains the original excellent characteristics as much as possible, the ZVS operation is realized with a small frequency offset within a wide parameter range. Let f l increase in the range of [f 0 f max with f g as the step value, and let f s decrease in the range of [f min f 0 with f g as the step value, calculate the inverter current at the switching moment, and find the frequency that satisfies Equation (13). If such a frequency exists, go to Step4; otherwise, go to Step5;

[0111] Step4: Adjust the operating frequency of the inverter to the found frequency f;

[0112] Step5: Since the coupling and compensation parameters deviate seriously from the rated parameters, ZVS cannot be realized under the current parameters. It is necessary to check the system parameters and take further actions, such as correcting the system compensation and coupling parameters.

[0113] In the embodiments of the present invention, the current expression at the switching moment is derived, the relationship between the ZVS operating state of the inverter and parameters such as output power, phase shift angle, and frequency is obtained, and then the frequency and / or phase shift angle for realizing the ZVS operation of the inverter is directly obtained through theoretical calculation. By adjusting the inverter frequency, the ZVS regulation of the inverter is realized, and the deficiencies brought by the existing technical methods are solved.

[0114] In some embodiments, the ZVS regulation of the inverter can be realized by adjusting the phase shift angle of the inverter. Figure 6 It is a schematic diagram of the ZVS process realized by the phase shift angle adjustment provided by the embodiments of the present invention. As Figure 6 shown, the specific steps are as follows:

[0115] Step1: Parameter initialization, obtaining system coupling and compensation parameters through parameter estimation and other methods;

[0116] Step2: Initialize the phase shift angle as δ 0 , and initialize the intermediate variables δ l and δ s to δ 0 as well.

[0117] Step3: To ensure that the system maintains the original excellent characteristics as much as possible, ZVS operation is realized with a small phase shift angle offset within a wide parameter range. Let δ l increase within the range of [δ 0 δ max with δ g as the step value, and let δ s decrease within the range of [δ min δ 0 with δ g as the step value, calculate the inverter current at the switching moment, and find the phase shift angle that satisfies Equation (13). If such a phase shift angle exists, go to Step4; otherwise, go to Step5;

[0118] Step4: Adjust the inverter phase shift angle to the searched phase shift angle δ;

[0119] Step5: Since the coupling and compensation parameters deviate severely from the rated parameters and ZVS cannot be realized under the current parameters, the system parameters need to be checked and further actions need to be taken, such as correcting the system compensation and coupling parameters.

[0120] In the embodiments of the present invention, the current expression at the switching moment is derived, the relationship between the ZVS operating state of the inverter and parameters such as output power, phase shift angle, and frequency is obtained, and then the frequency and / or phase shift angle for realizing the ZVS operation of the inverter is directly obtained through theoretical calculation. By adjusting the inverter phase shift angle, the ZVS regulation of the inverter is realized, and the deficiencies brought by the existing technical methods are solved.

[0121] In some embodiments, zero-voltage switching (ZVS) control of the inverter can be achieved by adjusting the operating frequency and phase-shift angle of the inverter. Figure 7 It is a schematic diagram of the ZVS process achieved by adjusting the frequency and phase-shift angle provided by an embodiment of the present invention. As Figure 7 shown, the specific steps are as follows:

[0122] Step1: Parameter initialization. Obtain the system coupling and compensation parameters through parameter estimation and other methods.

[0123] Step2: Initialize the frequency to f 0 , and initialize the intermediate variables f l and f s to f 0 as well.

[0124] Step3: Initialize the phase-shift angle to δ 0 , and initialize the intermediate variables δ l and δ s to δ 0 as well.

[0125] Step4: To ensure that the system maintains its original excellent characteristics as much as possible, achieve ZVS operation with a small phase-shift angle offset within a wide parameter range. Let δ l increase within the range of [δ 0 δ max with δ g as the step value, and let δ s decrease within the range of [δ min δ 0 with δ g as the step value. Calculate the inverter current at the switching moment and find the phase-shift angle that satisfies Equation (13). If such a phase-shift angle exists, go to Step5; otherwise, go to Step6.

[0126] Step5: Adjust the operating frequency and phase-shift angle of the inverter to the searched frequency f and phase-shift angle δ.

[0127] Step6: Let f l increase within the range of [f 0 f max with f g as the step value, and let f s decrease within the range of [f min f 0 with f g as the step value, and then go to Step3.

[0128] If the operating frequency is [f min f max and the phase-shift angle search range is [δ min, δ max If ZVS operation cannot be satisfied within max all the time, it indicates that due to the serious deviation of the coupling and compensation parameters from the rated parameters, ZVS cannot be achieved under the current parameters. It is necessary to check the system parameters and take further actions, such as correcting the system compensation and coupling parameters.

[0129] In the embodiment of the present invention, the current expression at the switching moment is derived, and the relationship between the ZVS operation state of the inverter and parameters such as output power, phase shift angle, and frequency is obtained. Furthermore, the frequency and / or phase shift angle for realizing the ZVS operation of the inverter are directly obtained through theoretical calculation. By adjusting the inverter frequency and phase shift angle, the ZVS regulation of the inverter is realized, solving the deficiencies brought by the existing technical methods.

[0130] The inverter ZVS regulation device provided by the present invention will be described below. The inverter ZVS regulation device described below can be correspondingly referred to the inverter ZVS regulation method described above.

[0131] Figure 8 is the structural schematic diagram of the inverter ZVS regulation device provided by the present invention, as Figure 8 shown, the present invention provides an inverter ZVS regulation device, including:

[0132] The regulation module 801 is used to realize the ZVS regulation of the inverter by adjusting the inverter parameters under the condition that the parameters of the wireless power transmission system change;

[0133] Among them, the parameters of the wireless power transmission system include one or more of the following parameters:

[0134] Compensation parameters;

[0135] Mutual inductance parameters;

[0136] Load parameters;

[0137] The inverter parameters include one or more of the following parameters:

[0138] Operating frequency;

[0139] Phase shift angle.

[0140] In some embodiments, the regulation module is specifically used for:

[0141] Realize the ZVS regulation of the inverter by adjusting the operating frequency of the inverter.

[0142] In some embodiments, the regulation module is specifically used for:

[0143] Realize the ZVS regulation of the inverter by adjusting the phase shift angle of the inverter.

[0144] In some embodiments, the regulation module is specifically configured to:

[0145] By adjusting the operating frequency of the inverter and the phase-shift angle of the inverter, the zero-voltage switching (ZVS) regulation of the inverter is achieved.

[0146] Specifically, the above-mentioned zero-voltage switching (ZVS) regulation device for the inverter provided by the embodiments of the present invention can implement all the method steps implemented by the above-mentioned method embodiments, and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments will not be specifically described herein.

[0147] Figure 9 Illustrates a schematic diagram of the physical structure of an electronic device, as Figure 9 shown. The electronic device may include: a processor 910, a communication interface 920, a memory 930, and a communication bus 940. Among them, the processor 910, the communication interface 920, and the memory 930 complete communication with each other through the communication bus 940. The processor 910 can call the logical instructions in the memory 930 to execute the zero-voltage switching (ZVS) regulation method for the inverter. The method includes:

[0148] Under the working conditions of the change of the parameters of the wireless power transfer system, by adjusting the parameters of the inverter, the zero-voltage switching (ZVS) regulation of the inverter is achieved;

[0149] Among them, the parameters of the wireless power transfer system include one or more of the following parameters:

[0150] Compensation parameters;

[0151] Mutual inductance parameters;

[0152] Load parameters;

[0153] The inverter parameters include one or more of the following parameters:

[0154] Operating frequency;

[0155] Phase-shift angle.

[0156] In addition, when the logical instructions in the above-mentioned memory 930 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks, or optical discs that can store program codes.

[0157] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the inverter ZVS control method provided by the above-mentioned various methods. The method includes:

[0158] Under the condition of parameter changes in the wireless power transmission system, by adjusting the inverter parameters, the ZVS control of the inverter is achieved;

[0159] Among them, the wireless power transmission system parameters include one or more of the following parameters:

[0160] Compensation parameters;

[0161] Mutual inductance parameters;

[0162] Load parameters;

[0163] The inverter parameters include one or more of the following parameters:

[0164] Operating frequency;

[0165] Phase shift angle.

[0166] On another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it realizes the inverter ZVS control method provided by the above-mentioned various methods. The method includes:

[0167] Under the condition of parameter changes in the wireless power transmission system, by adjusting the inverter parameters, the ZVS control of the inverter is achieved;

[0168] Among them, the wireless power transmission system parameters include one or more of the following parameters:

[0169] Compensation parameter;

[0170] Mutual inductance parameter;

[0171] Load parameter;

[0172] The inverter parameters include one or more of the following parameters:

[0173] Operating frequency;

[0174] Phase shift angle.

[0175] The device embodiments described above are merely illustrative. 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 to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0176] In addition, it should be noted that in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple.

[0177] In the embodiments of the present invention, the term "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0178] In the embodiments of the present invention, "determining B based on A" means that the factor A should be considered when determining B. It is not limited to "determining B only based on A", but also includes: "determining B based on A and C", "determining B based on A, C, and E", "determining C based on A and further determining B based on C", etc. In addition, it can also include using A as a condition for determining B. For example, "when A meets the first condition, use the first method to determine B"; for another example, "when A meets the second condition, determine B"; for another example, "when A meets the third condition, determine B based on the first parameter", etc. Of course, it can also be a condition for using A as a factor for determining B. For example, "when A meets the first condition, use the first method to determine C and further determine B based on C", etc.

[0179] In the embodiments of the present invention, the term "a plurality of" means two or more, and other quantifiers are similar thereto.

[0180] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An inverter ZVS control method, characterized in that, it includes: Under the condition of parameter change of the wireless power transmission system, the inverter ZVS control is realized by adjusting the inverter parameters; Among them, the wireless power transmission system parameters include one or more of the following parameters: Compensation parameters; Mutual inductance parameters; Load parameters; The inverter parameters include one or more of the following parameters: Operating frequency; Phase shift angle; When there are deviations in the frequency conversion, phase shift angle, and coupling and compensation parameters, the current I on the secondary side of the coupling mechanism of the wireless power transmission system is as follows: S The expression is as follows: Among them, k R represents the ratio of the true value of the load resistance to the rated value, k ω2 represents the ratio of the actual operating frequency to the secondary resonant frequency, k ω represents the ratio of the secondary resonant frequency to the ideal resonant frequency, k Lr represents the ratio of the actual value of the primary series compensation inductor to the ideal value, k M represents the ratio of the actual value of the mutual inductance to the ideal value.

2. The inverter ZVS control method according to claim 1, characterized in that, Realizing the inverter ZVS control by adjusting the inverter parameters includes: Realizing the inverter ZVS control by adjusting the operating frequency of the inverter.

3. The inverter ZVS control method according to claim 1, characterized in that, Realizing the inverter ZVS control by adjusting the inverter parameters includes: Realizing the inverter ZVS control by adjusting the phase shift angle of the inverter.

4. The inverter ZVS control method according to claim 1, characterized in that, Realizing the inverter ZVS control by adjusting the inverter parameters includes: Realizing the inverter ZVS control by adjusting the operating frequency of the inverter and the phase shift angle of the inverter.

5. An inverter ZVS control device, characterized in that, it includes: A control module for realizing the inverter ZVS control by adjusting the inverter parameters under the condition of parameter change of the wireless power transmission system; Among them, the wireless power transmission system parameters include one or more of the following parameters: Compensation parameters; Mutual inductance parameters; Load parameters; The inverter parameters include one or more of the following parameters: Operating frequency; Phase shift angle; When there are deviations in the frequency conversion, phase shift angle, and coupling and compensation parameters, the current I in the secondary side of the coupling mechanism of the wireless power transmission system is as follows: S The expression is as follows: Among them, k R represents the ratio of the true value to the rated value of the load resistance, k ω2 represents the ratio of the actual operating frequency to the secondary resonant frequency, k ω represents the ratio of the secondary resonant frequency to the ideal resonant frequency, k Lr represents the ratio of the actual value to the ideal value of the primary series compensation inductor, k M represents the ratio of the actual value to the ideal value of the mutual inductance.

6. The inverter ZVS control device according to claim 5, characterized in that, The control module is specifically used for: Realizing the inverter ZVS control by adjusting the operating frequency of the inverter.

7. The inverter ZVS control device according to claim 5, characterized in that, The control module is specifically used for: Realizing the inverter ZVS control by adjusting the phase shift angle of the inverter.

8. The inverter ZVS control device according to claim 5, characterized in that, The control module is specifically used for: Realizing the inverter ZVS control by adjusting the operating frequency of the inverter and the phase shift angle of the inverter.

9. An electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it realizes the inverter ZVS control method according to any one of claims 1 to 4.

10. A non-transitory computer-readable storage medium, on which a computer program is stored, characterized in that, When the computer program is executed by a processor, it realizes the inverter ZVS control method according to any one of claims 1 to 4.

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