Zero-potential full-bridge switch control method and device and storage medium
By constructing a mathematical model of the zero-potential full-bridge switching circuit and performing zero-potential switching control, the problem of large switching losses in the full-bridge transformer switching circuit is solved, and more efficient energy conversion and lower losses are achieved.
Patent Information
- Application Number
- CN202411617453.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-02-28
AI Technical Summary
The existing full-bridge transformer switching circuits have obvious switching losses, resulting in overheating of the switch and a decrease in overall efficiency.
By constructing a mathematical model of the zero-potential full-bridge switching circuit and combining the working mode of the full-bridge switching circuit, the full-bridge switching circuit is controlled by zero-potential switching, reducing the turn-on loss and turn-off loss.
Effectively reduce the on-off loss and shutdown loss of the full-bridge switch, improve efficiency, reduce response time, and ensure the stability of the full-bridge switch circuit.
Smart Images
Figure CN119543610A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of switch control technology, and in particular to a zero-potential full-bridge switch control method, device and storage medium. Background Art
[0002] The full-bridge transformer switching circuit usually consists of four switches. The two diagonal switches are turned on at the same time, and the two switches on the same side are turned on alternately, thereby inverting DC into AC, and changing the output voltage by changing the duty cycle of the switch. The full-bridge transformer switching circuit is mainly used in situations where the input voltage is relatively high. When the input voltage is very high, the output power of the full-bridge transformer switching circuit is much greater than the output power of the push-pull transformer switching power supply. Therefore, most of the high-power switching power supplies with a grid voltage of 220 volts AC use full-bridge transformer switching circuits.
[0003] The output power of the full-bridge transformer switching circuit is approximately equal to twice the output power of a single switching circuit, so it has the advantages of large output power and high working efficiency. By working alternately with two sets of switches, it is equivalent to two switching power supplies outputting power at the same time. After bridge rectification or full-wave rectification, the voltage ripple coefficient and current ripple coefficient of the output voltage are very small. Only a very small energy storage filter capacitor or energy storage filter inductor is needed to obtain an output voltage with very small voltage ripple and current ripple. At the same time, the voltage withstand requirements of the full-bridge transformer switching circuit for the four switches can be reduced by half compared with the voltage withstand requirements of the push-pull transformer switching circuit for the two switches. This is because the four switches of the full-bridge transformer switching circuit are divided into two groups. When working, the two switches are connected in series. When turned off, the voltage borne by each switch is only half of the voltage borne by a single switch. Therefore, the full-bridge transformer switching circuit has the advantages of large output power, high working efficiency and low voltage withstand requirements for switches.
[0004] However, the full-bridge transformer switching circuit in the prior art has certain disadvantages, because the full-bridge transformer switching circuit is usually turned on at a high potential. When the switch is turned on from a high potential, due to the characteristics of the non-ideal switch, the voltage of the switch will not drop to zero immediately, but there is a certain drop time. At the same time, the current will not rise to the load current immediately, but there is a certain rise time. During this period of time, there is an overlap between the current and voltage of the switch, which will produce a large loss. This loss is called the turn-on loss of the switching power supply. Similarly, the turn-off loss also occurs in the process of the switch switching from the on state to the off state. When the switch is turned off from a high potential, due to the characteristics of the non-ideal switch, the changes in voltage and current are not completed instantly, resulting in losses during the turn-off process. As a result, the existing full-bridge transformer has a relatively obvious switching loss, and the switching loss will cause the switch itself to overheat, and because part of the electrical energy is converted into heat energy rather than useful work during the switching loss process, the overall efficiency of the full-bridge transformer switching circuit is reduced. Summary of the invention
[0005] The purpose of the present application is to provide a zero-potential full-bridge switch control method, device and storage medium to reduce the loss of the full-bridge switch through zero-potential switch control.
[0006] In the first aspect, the present application provides a zero-potential full-bridge switch control method using the following technical solution: A zero-potential full-bridge switch control method, comprising: Establish a mathematical model of zero-potential full-bridge switching circuit; Acquire an operating mode of the full-bridge switch circuit, wherein the operating mode includes a continuous conduction mode and a discontinuous conduction mode; According to the mathematical model of the zero-potential full-bridge switch circuit, the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero is obtained as the condition for zero voltage switching and zero current switching of the full-bridge switch circuit; The conditions of zero voltage switching and zero current switching of the full-bridge switch circuit are taken as control targets, and the control parameters are obtained according to the mathematical model of the zero potential full-bridge switch circuit and the working mode of the full-bridge switch circuit; The zero-potential full-bridge switching circuit is controlled according to the control parameters to realize zero-voltage switching or zero-voltage switching of the circuit.
[0007] By adopting the above-mentioned technical solution, the present application constructs a mathematical model of a zero-potential full-bridge switching circuit, and performs zero-potential switching control on the full-bridge switching circuit in combination with the working mode of the full-bridge switching circuit. It can be applicable to different working modes and working states, and adapt to the actual needs of different full-bridge switching circuits. Compared with high-potential switching control, it can effectively reduce the turn-on loss and turn-off loss of the full-bridge switch.
[0008] Furthermore, the mathematical model of the zero-potential full-bridge switch circuit includes a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a capacitor C1, a switch tube C2 and a transformer T, wherein the switch tube S1 and the switch tube S3 are connected between the positive terminal of the DC power supply and the primary side of the transformer T, the switch tube S2 and the switch tube S4 are connected between the primary side of the transformer T and the negative terminal of the DC power supply, the capacitor C1 is connected in parallel with the switch tube S1 and the switch tube S3, and the capacitor C2 is connected in parallel with the switch tube S2 and the switch tube S4; The method of controlling the zero potential full-bridge switch circuit according to the control parameters to realize circuit zero voltage switching or zero current switching specifically includes: Generate a zero potential turn-on signal and a zero potential turn-off signal according to control parameters; The capacitor C1 and the capacitor C2 are controlled according to the zero potential turn-on signal and the zero potential turn-off signal so that the switch tubes S1 , S2 , S3 and S4 are turned on or off under the zero potential condition.
[0009] By adopting the above technical solution, the present application generates corresponding zero-potential turn-on signals and zero-potential turn-off signals to control capacitor C1 and capacitor C2 accordingly, so as to realize zero-potential switching of switch tubes S1, S2, S3 and S4, thereby ensuring the stability of the full-bridge switching circuit.
[0010] Furthermore, after the capacitors C1 and C2 are controlled according to the zero potential turn-on signal and the zero potential turn-off signal to turn on or off the switches S1, S2, S3, and S4 under the zero potential condition, the method further includes: Acquire circuit state parameters after being controlled by a zero potential turn-on signal and a zero potential turn-off signal, wherein the circuit state parameters include a real-time voltage across the switch tube and a real-time current flowing through the switch tube; Generate a feedback control signal according to the real-time voltage across the switch tube and the real-time current flowing through the switch tube; The zero potential turn-on signal and the zero potential turn-off signal are adjusted in real time according to the feedback control signal.
[0011] By adopting the above technical solution, the present application adjusts the zero-potential turn-on signal and the zero-potential turn-off signal in real time through feedback control, which can be more adapted to the actual situation of circuit operation and ensure the accuracy of zero-potential switch control.
[0012] Further, the control parameters are obtained according to the mathematical model of the zero-potential full-bridge switch circuit and the working mode of the full-bridge switch circuit, including establishing a circuit state equation according to the mathematical model of the zero-potential full-bridge switch circuit and the working mode of the full-bridge switch circuit, specifically including: Identify all circuit elements in a full-bridge switching circuit and develop a mathematical model for each circuit element; The circuit state equation describing the dynamic changes of the circuit is established through the mathematical model of circuit elements and Kirchhoff's laws.
[0013] By adopting the above technical solution, the present application constructs a circuit state equation through Kirchhoff's laws. Kirchhoff's laws include Kirchhoff's voltage law and Kirchhoff's current law. Kirchhoff's voltage law states that the algebraic sum of voltages in any closed loop is zero, and Kirchhoff's current law states that the algebraic sum of currents at any node is zero. Constructing the circuit state equation according to the above standards can improve the accuracy of zero potential control.
[0014] Furthermore, establishing a mathematical model for each circuit element includes: The mathematical model of resistance is: V = IR, where V represents voltage, I represents current, and R represents resistance value; And / or, the mathematical model of inductance is: V = L\frac{dI}{dt}, where V represents voltage, I represents current, and L represents inductance value; And / or, the mathematical model of capacitance is: I = C\frac{dV}{dt}, where V represents voltage, I represents current, and C represents capacitance value; And / or, the mathematical model of the switch tube is: when it is turned on, it is regarded as a short circuit, V = 0; when it is turned off, it is regarded as an open circuit, I = 0.
[0015] By adopting the above technical solution, the present application establishes a mathematical model for each circuit element through the characteristics of different circuit elements, thereby improving the accuracy of zero-potential control.
[0016] Furthermore, before the zero-potential full-bridge switch circuit is controlled according to the control parameters to realize zero voltage switching or zero current switching of the circuit, the control parameters are optimized, specifically including: Taking one or more of minimizing loss, maximizing efficiency or maximizing response time as optimization goals; Construct an optimization algorithm and initialize the algorithm parameters of the optimization algorithm; The control parameters are iteratively optimized through the optimization algorithm to obtain the optimized control parameters.
[0017] By adopting the above technical solution, the present application optimizes the control parameters to achieve minimized loss, highest efficiency or fastest response time, which can effectively reduce the loss of the zero-potential full-bridge switch, improve efficiency and reduce response time.
[0018] Furthermore, the iterative optimization of the control parameters by the optimization algorithm to obtain the optimized control parameters also includes: Constructing an evaluation function according to the optimization objective, the evaluation function including one or more of a loss evaluation function, an efficiency evaluation function or a response time evaluation function; Monitoring the performance of the optimization algorithm by using an evaluation function during the iterative optimization of the control parameters by the optimization algorithm; Evaluate the performance of the optimization algorithm and the effectiveness of the optimized control parameters; The final optimized control parameters are obtained based on the evaluation results of the performance of the optimization algorithm and the effectiveness of the optimized control parameters.
[0019] By adopting the above technical solution, the present application further optimizes the optimization algorithm through the evaluation function to ensure that the final optimized control parameters are accurate enough, thereby improving the accuracy of zero-potential control.
[0020] Furthermore, the step of obtaining the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero according to the mathematical model of the zero-potential full-bridge switch circuit specifically includes: Determine the on and off time of the switch tube by current zero-crossing detection, as the time when the current flowing through the switch tube is zero; The turn-on and turn-off moments of the switch tube are determined by voltage zero-crossing detection, which is the moment when the voltage at both ends is zero.
[0021] By adopting the above technical solution, the present application can effectively improve the stability and safety of the system, reduce electromagnetic interference, and achieve more precise control by obtaining the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero through zero-crossing detection.
[0022] In a second aspect, the present application provides a computer device that adopts the following technical solution: A computer device comprises a memory and a processor, wherein the memory stores a zero-potential full-bridge switch control method as described in the first aspect which can be loaded and executed by the processor.
[0023] In a second aspect, a computer-readable storage medium provided by the present application adopts the following technical solution: A computer-readable storage medium stores a computer program that can be loaded by a processor and executes a zero-potential full-bridge switch control method as described in the first aspect.
[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. This application constructs a mathematical model of a zero-potential full-bridge switch circuit and performs zero-potential switch control on the full-bridge switch circuit in combination with the working mode of the full-bridge switch circuit. It can be applied to different working modes and working states, adapt to the actual needs of different full-bridge switch circuits, and effectively reduce the turn-on loss and turn-off loss of the full-bridge switch. 2. This application adjusts the zero-potential turn-on signal and the zero-potential turn-off signal in real time through feedback control, which can be more adapted to the actual situation of circuit operation and ensure the accuracy of zero-potential switch control; 3. This application achieves minimized loss, maximum efficiency or fastest response time by optimizing control parameters, which can effectively reduce the loss of the zero-potential full-bridge switch, improve efficiency and reduce response time. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 is a flow chart of a zero potential full-bridge switch control method according to an embodiment of the present application; Figure 2 It is a flow chart of the control parameter optimization method of an embodiment of the present application. DETAILED DESCRIPTION
[0026] The following is combined with Figure 1 -Attached Figure 2 , further details of this application are given.
[0027] The full-bridge transformer switching circuit in the prior art has certain disadvantages, because the full-bridge transformer switching circuit is usually turned on at a high potential. When the switch is turned on from a high potential, due to the characteristics of the non-ideal switch, the voltage of the switch will not drop to zero immediately, but there is a certain drop time. At the same time, the current will not rise to the load current immediately, but there is a certain rise time. During this period of time, there is an overlapping area between the current and voltage of the switch, which will produce a large loss. This loss is called the turn-on loss of the switching power supply. Similarly, the turn-off loss also occurs in the process of the switch switching from the on state to the off state. When the switch is turned off from a high potential, due to the characteristics of the non-ideal switch, the changes in voltage and current are not completed instantly, resulting in losses during the turn-off process. As a result, the existing full-bridge transformer has a relatively obvious switching loss. The switching loss will cause the switch itself to overheat, and because part of the electrical energy is converted into heat energy rather than useful work during the switching loss process, the overall efficiency of the full-bridge transformer switching circuit is reduced. Therefore, an embodiment of the present application provides a zero-potential full-bridge switch control method, referring to Figure 1 ,include: S1. Establish a mathematical model of a zero-potential full-bridge switching circuit.
[0028] Specifically, the mathematical model of the full-bridge switch circuit includes a switch tube model, a resonant element model, a load model, etc. The mathematical model of the circuit uses mathematical language to describe the interaction and energy conversion between the various components in the circuit, including the basic physical quantities such as voltage, current, resistance, capacitance, inductance, etc. in the circuit, as well as the relationship between them. The mathematical model of the circuit can understand and predict the dynamic behavior of the circuit in a simplified way.
[0029] S2. Obtain the working mode of the full-bridge switching circuit.
[0030] Specifically, the operating modes include continuous conduction mode (CCM) and discontinuous conduction mode (DCM). When the operating mode is CCM, the inductor current is continuous throughout the switching cycle without current discontinuity. This usually occurs under conditions of high load current and low switching frequency, and the dynamic characteristics of the circuit can be analyzed by a linearized model. When the operating mode is DCM, the inductor current drops to zero in each switching cycle and then rises again. This usually occurs under conditions of low load current and high switching frequency, and the impact of current discontinuity on the dynamic characteristics of the circuit needs to be considered.
[0031] S3. According to the mathematical model of the zero-potential full-bridge switch circuit, the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero is obtained as the condition for zero voltage switching and zero current switching of the full-bridge switch circuit.
[0032] Specifically, the on and off times of the switch tube are determined by current zero-crossing detection, as the time when the current flowing through the switch tube is zero, and the on and off times of the switch tube are determined by voltage zero-crossing detection, as the time when the voltage at both ends is zero.
[0033] S4. Taking the conditions of zero voltage switching and zero current switching of the full-bridge switching circuit as control targets, the control parameters are obtained according to the mathematical model of the zero potential full-bridge switching circuit and the working mode of the full-bridge switching circuit.
[0034] Specifically, the control target is set as a zero potential switch, and the control parameters are obtained according to the control target.
[0035] S5. Control the zero-potential full-bridge switching circuit according to the control parameters to achieve zero-voltage switching or zero-current switching of the circuit.
[0036] Specifically, a zero potential turn-on signal and a zero potential turn-off signal are generated according to the control parameters, thereby realizing zero potential switching of the full-bridge switch circuit.
[0037] The implementation principle of the embodiment of the present application is: by constructing a mathematical model of a zero-potential full-bridge switching circuit, and combining the working mode of the full-bridge switching circuit to perform zero-potential switching control on the full-bridge switching circuit, it can be applicable to different working modes and working states, and adapt to the actual needs of different full-bridge switching circuits. Compared with high-potential switching control, it can effectively reduce the turn-on loss and turn-off loss of the full-bridge switch.
[0038] The mathematical model of the zero-potential full-bridge switch circuit of the embodiment of the present application includes a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a capacitor C1, a switch tube C2 and a transformer T. The switch tube S1 and the switch tube S3 are connected between the positive terminal of the DC power supply and the primary side of the transformer T, the switch tube S2 and the switch tube S4 are connected between the primary side of the transformer T and the negative terminal of the DC power supply, the capacitor C1 is connected in parallel with the switch tube S1 and the switch tube S3, and the capacitor C2 is connected in parallel with the switch tube S2 and the switch tube S4. Then, step S5 of the embodiment of the present application specifically includes: S51 . Generate a zero potential turn-on signal and a zero potential turn-off signal according to control parameters.
[0039] S52 , controlling the capacitor C1 and the capacitor C2 according to the zero potential turn-on signal and the zero potential turn-off signal so that the switch tubes S1 , S2 , S3 and S4 are turned on or off under the zero potential condition.
[0040] In order to improve the accuracy of zero-potential switch control, the embodiment of the present application also needs to perform feedback control on the mathematical model of the zero-potential full-bridge switch circuit, specifically including: S6. Obtain circuit state parameters after the zero potential turn-on signal and the zero potential turn-off signal are controlled.
[0041] Specifically, the circuit state parameters include the real-time voltage across the switch tube and the real-time current flowing through the switch tube.
[0042] S7. Generate a feedback control signal according to the real-time voltage across the switch tube and the real-time current flowing through the switch tube.
[0043] Specifically, under ideal conditions, the voltage across the switch tube and the current flowing through the switch tube controlled by the zero-potential switch should both be zero, but the actual real-time voltage and real-time current may be different from the ideal state, so feedback control is performed through the real-time voltage and real-time current.
[0044] S8. Adjust the zero potential turn-on signal and the zero potential turn-off signal in real time according to the feedback control signal.
[0045] Specifically, the zero potential turn-on signal and the zero potential turn-off signal are adjusted in real time through feedback control, which can be more adapted to the actual situation of circuit operation.
[0046] Step S4 of the embodiment of the present application also includes establishing a circuit state equation according to the mathematical model of the zero-potential full-bridge switch circuit and the working mode of the full-bridge switch circuit, specifically including: S41. Identify all circuit elements in the full-bridge switching circuit and establish a mathematical model for each circuit element.
[0047] Specifically, a mathematical model is established for each circuit element based on the characteristics of different circuit elements, where the mathematical model of the resistor is: V = IR, where V represents voltage, I represents current, and R represents resistance. The mathematical model of the inductor is: V = L\frac{dI}{dt}, where V represents voltage, I represents current, and L represents inductance. The mathematical model of the capacitor is: I = C\frac{dV}{dt}, where V represents voltage, I represents current, and C represents capacitance. The mathematical model of the switch tube is: when it is turned on, it is regarded as a short circuit, V = 0; when it is turned off, it is regarded as an open circuit, I = 0.
[0048] S42. Establish the circuit state equation that describes the dynamic changes of the circuit through the mathematical model of circuit elements and Kirchhoff's laws.
[0049] Specifically, Kirchhoff's laws include Kirchhoff's voltage law and Kirchhoff's current law. Kirchhoff's voltage law states that the algebraic sum of voltages in any closed loop is zero, and Kirchhoff's current law states that the algebraic sum of currents at any node is zero. By constructing the circuit state equation through Kirchhoff's laws, the dynamic changes of the circuit can be described.
[0050] In order to further improve the accuracy of control, reduce the loss of zero-potential full-bridge switch, improve efficiency and reduce response time. Before step S5 of the embodiment of the present application, it also includes optimizing the control parameters, referring to Figure 2 , specifically including: A1. Take one or more of minimizing loss, maximizing efficiency or maximizing response time as the optimization goal.
[0051] Specifically, the optimization goal is determined, such as minimizing switching loss, maximizing efficiency, minimizing ripple, or maximizing dynamic response time. One or more objective functions are established, and the objective function is used to quantify the optimization goal, such as efficiency, loss, or response time.
[0052] A2. Build an optimization algorithm and initialize the algorithm parameters of the optimization algorithm.
[0053] Specifically, consider the global search capability, convergence speed and adaptability to the complexity of the optimization algorithm, and select the appropriate optimization algorithm according to actual needs, such as genetic algorithm (GA), particle swarm optimization (PSO) or other meta-heuristic algorithms. When initializing the algorithm parameters of the optimization algorithm, for the genetic algorithm, initialize the population, set the population size, crossover probability, mutation probability and maximum number of iterations. For particle swarm optimization, initialize the particle swarm, set the number of particles, speed limit, inertia weight and maximum number of iterations.
[0054] A3. Iteratively optimize the control parameters through the optimization algorithm to obtain the optimized control parameters.
[0055] Specifically, the optimization algorithm is run to gradually improve the quality of the solution through an iterative process. For genetic algorithms, selection, crossover, and mutation operations are performed. For particle swarm optimization, the positions and velocities of the particles are updated to find the global optimal solution.
[0056] A4. Construct an evaluation function based on the optimization objective.
[0057] Specifically, the evaluation function includes one or more of a loss evaluation function, an efficiency evaluation function, or a response time evaluation function. According to the optimization goal, an evaluation function is defined to evaluate the pros and cons of each parameter combination. The evaluation function may include indicators such as efficiency, loss, and response time.
[0058] A5. During the iterative optimization process of the control parameters by the optimization algorithm, the performance of the optimization algorithm is monitored by the evaluation function.
[0059] Specifically, during the optimization process, the performance of the algorithm is monitored, such as convergence speed and solution quality, and algorithm parameters such as crossover probability, mutation probability, or inertia weight are adjusted as needed.
[0060] A6. Evaluate the performance of the optimization algorithm and the effectiveness of the optimized control parameters.
[0061] Specifically, analyze the optimization results, evaluate the performance of the optimization algorithm and the effectiveness of the optimization parameters, and iterate the optimization process as needed to further improve the control parameters.
[0062] A7. The final optimized control parameters are obtained based on the evaluation results of the performance of the optimization algorithm and the effectiveness of the optimized control parameters.
[0063] Specifically, the optimization algorithm is further optimized through the evaluation function to ensure that the optimized control parameters are accurate enough, thereby improving the accuracy of zero-potential control.
[0064] In the specific implementation process, the accuracy of control can be improved through dynamic tuning and adaptive control, and the control parameters can be dynamically adjusted according to the changes in circuit parameters, such as load changes, temperature changes, etc. And the control algorithm can automatically identify and adapt to the dynamic characteristics of the circuit to ensure that zero-potential switching control can be achieved under various working conditions.
[0065] The embodiment of the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute a zero-potential full-bridge switch control method, specifically including: S1. Establish a mathematical model of a zero-potential full-bridge switching circuit.
[0066] S2. Obtain the working mode of the full-bridge switching circuit.
[0067] S3. According to the mathematical model of the zero-potential full-bridge switch circuit, the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero is obtained as the condition for zero voltage switching and zero current switching of the full-bridge switch circuit.
[0068] S4. Taking the conditions of zero voltage switching and zero current switching of the full-bridge switching circuit as control targets, the control parameters are obtained according to the mathematical model of the zero potential full-bridge switching circuit and the working mode of the full-bridge switching circuit.
[0069] S5. Control the zero-potential full-bridge switching circuit according to the control parameters to achieve zero-voltage switching or zero-current switching of the circuit.
[0070] Wherein, the computer is a server, and the computer device includes a processor, a memory, a network interface and a database connected through a system bus. Wherein, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store a mathematical model of a zero-potential full-bridge switching circuit, conditions, control parameters, optimization algorithms, etc. of zero-voltage switching and zero-current switching of a full-bridge switching circuit. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for testing the performance of a battery cell can be implemented.
[0071] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: S1. Establish a mathematical model of a zero-potential full-bridge switching circuit.
[0072] S2. Obtain the working mode of the full-bridge switching circuit.
[0073] S3. According to the mathematical model of the zero-potential full-bridge switch circuit, the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero is obtained as the condition for zero voltage switching and zero current switching of the full-bridge switch circuit.
[0074] S4. Taking the conditions of zero voltage switching and zero current switching of the full-bridge switching circuit as control targets, the control parameters are obtained according to the mathematical model of the zero potential full-bridge switching circuit and the working mode of the full-bridge switching circuit.
[0075] S5. Control the zero-potential full-bridge switching circuit according to the control parameters to achieve zero-voltage switching or zero-current switching of the circuit.
[0076] In addition, the processor in the computer device executes all the steps of the above-mentioned zero-potential full-bridge switch control method when executing the computer program.
[0077] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM) and memory bus dynamic RAM (RDRAM).
[0078] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.
[0079] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A zero potential full-bridge switch control method, characterized in that: include: Establish a mathematical model of zero-potential full-bridge switching circuit; Acquire an operating mode of the full-bridge switch circuit, wherein the operating mode includes a continuous conduction mode and a discontinuous conduction mode; According to the mathematical model of the zero-potential full-bridge switch circuit, the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero is obtained as the condition for zero voltage switching and zero current switching of the full-bridge switch circuit; The conditions of zero voltage switching and zero current switching of the full-bridge switching circuit are taken as control targets, and the control parameters are obtained according to the mathematical model of the zero potential full-bridge switching circuit and the working mode of the full-bridge switching circuit. The zero potential full-bridge switching circuit is controlled according to the control parameters to realize circuit zero voltage switching or zero current switching.
2. A zero potential full bridge switch control method according to claim 1, characterized in that: The mathematical model of the zero-potential full-bridge switch circuit includes a switch tube S1, a switch tube S2, a switch tube S3, a switch tube S4, a capacitor C1, a switch tube C2 and a transformer T, wherein the switch tube S1 and the switch tube S3 are connected between the positive terminal of the DC power supply and the primary side of the transformer T, the switch tube S2 and the switch tube S4 are connected between the primary side of the transformer T and the negative terminal of the DC power supply, the capacitor C1 is connected in parallel with the switch tube S1 and the switch tube S3, and the capacitor C2 is connected in parallel with the switch tube S2 and the switch tube S4; The method of controlling the zero potential full-bridge switch circuit according to the control parameters to realize circuit zero voltage switching or zero current switching specifically includes: Generate a zero potential turn-on signal and a zero potential turn-off signal according to control parameters; The capacitor C1 and the capacitor C2 are controlled according to the zero potential turn-on signal and the zero potential turn-off signal so that the switch tubes S1 , S2 , S3 and S4 are turned on or off under the zero potential condition.
3. A zero potential full bridge switch control method according to claim 2, characterized in that: After the capacitors C1 and C2 are controlled according to the zero potential turn-on signal and the zero potential turn-off signal so that the switch tubes S1, S2, S3, and S4 are turned on or off under the zero potential condition, the method further includes: Acquire circuit state parameters after being controlled by a zero potential turn-on signal and a zero potential turn-off signal, wherein the circuit state parameters include a real-time voltage across the switch tube and a real-time current flowing through the switch tube; Generate a feedback control signal according to the real-time voltage across the switch tube and the real-time current flowing through the switch tube; The zero potential turn-on signal and the zero potential turn-off signal are adjusted in real time according to the feedback control signal.
4. A zero potential full bridge switch control method according to claim 1, characterized in that: The control parameters are obtained according to the mathematical model of the zero-potential full-bridge switch circuit and the working mode of the full-bridge switch circuit, including establishing a circuit state equation according to the mathematical model of the zero-potential full-bridge switch circuit and the working mode of the full-bridge switch circuit, specifically including: Identify all circuit elements in a full-bridge switching circuit and develop a mathematical model for each circuit element; The circuit state equation describing the dynamic changes of the circuit is established through the mathematical model of circuit elements and Kirchhoff's laws.
5. A zero potential full bridge switch control method according to claim 4, characterized in that: The step of establishing a mathematical model for each circuit element comprises: The mathematical model of resistance is: V = IR, where V represents voltage, I represents current, and R represents resistance value; And / or, the mathematical model of inductance is: V = L\frac{dI}{dt}, where V represents voltage, I represents current, and L represents inductance value; And / or, the mathematical model of capacitance is: I = C\frac{dV}{dt}, where V represents voltage, I represents current, and C represents capacitance value; And / or, the mathematical model of the switch tube is: when it is turned on, it is regarded as a short circuit, V = 0; when it is turned off, it is regarded as an open circuit, I = 0.
6. A zero potential full bridge switch control method according to claim 1, characterized in that: Before the zero-voltage full-bridge switch circuit is controlled according to the control parameters to realize zero-voltage switch or zero-current switch of the circuit, the control parameters are optimized, specifically including: Taking one or more of minimizing loss, maximizing efficiency or maximizing response time as optimization goals; Construct an optimization algorithm and initialize the algorithm parameters of the optimization algorithm; The control parameters are iteratively optimized through the optimization algorithm to obtain the optimized control parameters.
7. A zero potential full bridge switch control method according to claim 6, characterized in that: The iterative optimization of the control parameters by the optimization algorithm to obtain the optimized control parameters also includes: Constructing an evaluation function according to the optimization objective, the evaluation function including one or more of a loss evaluation function, an efficiency evaluation function or a response time evaluation function; Monitoring the performance of the optimization algorithm by using an evaluation function during the iterative optimization of the control parameters by the optimization algorithm; Evaluate the performance of the optimization algorithm and the effectiveness of the optimized control parameters; The final optimized control parameters are obtained based on the evaluation results of the performance of the optimization algorithm and the effectiveness of the optimized control parameters.
8. A zero potential full bridge switch control method according to any one of claims 1 to 7, characterized in that: The step of obtaining the moment when the voltage across the switch tube is zero or the current flowing through the switch tube is zero according to the mathematical model of the zero-potential full-bridge switch circuit specifically includes: Determine the on and off time of the switch tube by current zero-crossing detection, as the time when the current flowing through the switch tube is zero; The switching on and off times of the switch tube are determined by voltage zero-crossing detection, which is the time when the voltage at both ends is zero.
9. A computer device, characterized in that: It comprises a memory and a processor, wherein the memory stores a zero-potential full-bridge switch control method as described in any one of claims 1 to 8 which can be loaded and executed by the processor.
10. A computer-readable storage medium, characterized in that: A computer program is stored which can be loaded by a processor and execute a zero-potential full-bridge switch control method as described in any one of claims 1 to 8.