A rapid development and verification method for a wireless charging system

Abstract

The technical scheme of the present application provides a wireless charging system rapid development and verification method. The present application makes full use of the advantages of high compatibility, high adaptability and high code readability of the debugging platform, and uses the same debugging platform unified debugging interface design and debugging wireless charging system. Through the method provided by the present application, the research, simulation and real demonstration of the control algorithm of the charging system in the actual deviation, disturbance and fault can be realized, and the response speed and steady state characteristics of the actual controller can also be quickly verified. The present application provides a fast, reliable and practical verification platform for verifying the key technology research of input, position and load disturbance change on the safe and stable output of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of open loop / closed loop fast development verification method for wireless charging system, its control system and whole machine experiment, belong to power electronic simulation and experimental method technical field. BACKGROUND

[0002] With the development of power electronic devices, control technology and integrated chips, the research work of wireless power transmission system is promoted. Industrial automation degree is continuously strengthened, and the high-speed development of modern science and technology industry, and the demand of wireless charging is more and more obvious. Wireless charging also fully plays its physical isolation, safety, durability and other advantages, especially in the field of aviation, military field and medical field, gradually begin to step into daily life, such as mobile phones, watches, earphones and other wearable electronic devices, static and dynamic charging of electric vehicles, and unmanned aerial vehicles and robots. For different application places, different functional requirements, the design of wireless charging system is also different, and the development and test of wireless charging equipment for different applications are an important link to promote this technology.

[0003] At present, there are many debugging methods: the first is pure software simulation, which is only suitable for preliminary verification due to too idealized parameters; the second is pure hardware debugging, and real-time debugging has certain blindness and high time and money cost. Compared with the above two, the software simulation platform is more practical in the process of wireless charging system fast development verification test. At present, there are many software simulation platforms, but they face many problems, such as continuous modification of system parameters, sampling of real-time feedback system and cooperation between controller speed and system response speed. And the existing control chips for wireless charging system are numerous, and the language logic languages of different types of chips are different, and the entry threshold is high. SUMMARY

[0004] The purpose of the present application is to provide a wireless charging system development method based on the same development environment, visualization and fast real and effective approximation to actual situation.

[0005] In order to achieve the above purpose, the technical scheme of the present application provides a wireless charging system fast development verification method, characterized in that it comprises the following steps:

[0006] Step 1, under the actual design requirement, the characteristic parameters of the wireless charging system are determined;

[0007] Step 2, determine the basic circuit parameters of the wireless charging system, build the open loop main circuit physical model of the wireless charging system by using Matlab or PSIM software, and construct the open loop simulation circuit; the running state of the wireless charging system is simulated by using the open loop simulation circuit, the input and output of the open loop wireless charging system in steady state are observed, and the design result is verified;

[0008] Step 3, after the open-loop verification of the wireless charging system is completed, the control strategy and control circuit and its algorithm are designed according to the open-loop simulation circuit, and the closed-loop control circuit and its algorithm of each level of the wireless charging system are built on Matlab to verify the closed-loop characteristics of each level of the circuit one by one; then the circuits at each level are cascaded, a system disturbance is designed, and the transient response and steady-state characteristics of the system when the disturbance is added are observed;

[0009] Step 4, after the actual wireless charging system is built according to the simulation results of steps 1 to 3, the hardware open-loop characteristics of the actual wireless charging system are first experimentally verified, and then the controller model and control algorithm for controlling the actual wireless charging system are built on the development platform of the Speedgoat real-time simulator; the Speedgoat real-time simulator and the actual wireless charging system form a complete feedback closed-loop system, and the Speedgoat real-time simulator is used to observe how to adjust the control algorithm to maintain the stable output of the actual wireless charging system when the load is offset, the input and output are disturbed, and the system fails;

[0010] Step 5, after the actual controller is built, the Speedgoat real-time simulator is used to simulate the wireless charging open-loop circuit of the actual wireless charging system to observe the real-time running state of the actual controller, including its transient response and steady-state characteristics.

[0011] Preferably, the input and output expressions of the coupling coils and their models established in Matlab or PSIM software are as follows:

[0012]

[0013] In the formula, I tx,i and V rx,j represent the input current of the i-th input coil and the output voltage of the j-th output coil; ω = 2πf represents the angular frequency, and f represents the system operating frequency; M ij represents the coupling between the i-th input coil and the j-th output coil.

[0014] Preferably, the Speedgoat real-time simulator, the actual wireless charging system, and the actual controller all adopt standard interfaces.

[0015] Preferably, the controller model and control algorithm real-time adjustment algorithm controls the duty cycle of the DC / DC converter, the PWM input of the DC / AC converter, and the synchronous rectification PWM input of the AC / DC converter in the actual wireless charging system.

[0016] The method provided by the application can realize research, simulation and real demonstration of the control algorithm of the charging system in actual deviation, disturbance and failure, and can also quickly verify the response speed and steady state characteristics of the actual controller.

[0017] Compared with the prior development scheme, the application fully utilizes the advantages of high compatibility, high adaptability and high code readability of the debugging platform, and designs and debugs the wireless charging system by using the unified debugging interface of the same debugging platform. The main scheme adopted by the application is to unify the debugging flow among all levels of the wireless power transmission system, so that it can be separately debugged and uniformly operated. When different objects are controlled, the function of the real-time simulator will also change, for example, the real-time controller of the wireless charging system verifies the control algorithm, the hardware-in-the-loop wireless charging system main circuit detects the transient response and steady state characteristics of the controller, and the parameter evaluation and performance evaluation of the overall system. On this basis, the developer can use the software to observe the dynamic changes of the system input and output in real time, directly modify the control algorithm for real-time compilation, and jointly control the circuits at all levels to complete the rapid and effective development work. The research focus can be placed on the control system level which is more technical and challenging rather than on the entry-level code debugging compatibility, interface matching and data acquisition. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 An experimental block diagram after the actual wireless charging system is built is shown;

[0019] Figure 2 An experimental block diagram after the actual controller is built is shown;

[0020] Figure 3 A complete system diagram of an example is shown;

[0021] Figure 4 A control signal observed on the real-time simulator is shown. DETAILED DESCRIPTION

[0022] The application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not to limit the scope of the application. In addition, it should be understood that those skilled in the art can make various modifications or changes to the application after reading the content taught by the application, and these equivalent forms also fall within the scope defined by the appended claims.

[0023] The implementation of the fast and effective development method provided by the application mainly adopts Speedgoat as a real-time simulator, adopts Matlab or PSIM software to develop and debug a control algorithm and a simulation circuit, and adopts an actual hardware circuit as a controlled object and a controller. The real-time simulator, the control algorithm and the simulation circuit, and the controlled object and the controller are connected through wires of a unified standard interface to perform data interaction, and the development and verification of the control algorithm and the simulation circuit are experienced when a real-time simulation system experiences disturbance, deviation and failure. The specific real-time simulation steps are as follows:

[0024] Step 1, under the actual design requirement, the characteristic parameters of the wireless charging system are determined, such as input and output levels.

[0025] Step 2, the basic circuit parameters of the wireless charging system are determined, and on the basis, the main circuit physical model of the open-loop wireless charging system is built by using Matlab or PSIM software, and the open-loop simulation circuit is constructed. The open-loop simulation circuit includes a power supply, a DC / DC converter, a DC / AC converter, a coupling coil and a compensation network, an AC / DC converter and a load circuit. The running state of the open-loop wireless charging system is simulated by using the open-loop simulation circuit, the input and output of the open-loop wireless charging system in the steady state are observed, and the design result is verified.

[0026] In the application, the input and output expressions of the coupling coil and the model established in the Matlab or PSIM software are as follows, so that the single coupling coil model and the multi-coupling coil model can be established in the main circuit physical model:

[0027]

[0028] In the formula, I tx,i and V rx,j respectively represent the input current of the i th input coil and the output voltage of the j th output coil; ω = 2 πf represents the angular frequency, and f represents the system operating frequency; M ij represents the coupling between the i th input coil and the j th output coil.

[0029] Step 3, after the open-loop verification of the wireless charging system is completed, the control strategy and the control circuit and the algorithm are designed according to the open-loop simulation circuit, the closed-loop control circuit and the algorithm of each circuit of the wireless charging system are built on the Matlab, and the closed-loop characteristics of each circuit are verified one by one. Then, the circuits are cascaded, the system disturbance such as input change, position change and load change is designed, and the transient response and the steady-state characteristics when the disturbance is added are observed.

[0030] Step 4, build the actual wireless charging system according to the simulation of step 1 to step 3, including power supply, inverter, coupler, rectifier and load. First, experimentally verify the hardware open-loop characteristics of the actual wireless charging system, including input and output efficiency, etc. Then build the controller model and control algorithm for controlling the actual wireless charging system on the development platform of the Speedgoat real-time simulator. The controller model and control algorithm adjust the duty cycle of the DC / DC converter, the PWM input of the DC / AC converter and the synchronous rectification PWM input of the AC / DC converter in real time. The Speedgoat real-time simulator and the actual wireless charging system form a complete feedback closed-loop system. Use the Speedgoat real-time simulator to observe how the control algorithm adjusts to maintain the stable output of the actual wireless charging system when the load is shifted, the input and output are disturbed, and the system fails.

[0031] Step 5, after building the actual controller, use the Speedgoat real-time simulator to simulate the wireless charging open-loop circuit of the actual wireless charging system. The actual controller and the Speedgoat real-time simulator are connected using standard interfaces to avoid signal crosstalk. Observe the real-time running state of the actual controller, including its transient response and steady-state characteristics.

[0032] Using the above method, select full-bridge inverter and Buck circuit as the primary and secondary side controllers, and LCC-S as the compensation network of the coupling coil. The design steps are as follows:

[0033] Step 1, determine the system parameters according to the application scenario, power requirement and functional bias: input and output voltage and current, and frequency. Design the coupling coil according to the above parameters and area size, simulate the circuit parameters, and observe the steady-state waveform and system characteristics.

[0034] Step 2, on the basis of step 1, select switching devices, drive chips, passive devices and diodes, etc. to build a main circuit hardware experimental platform, including: inverter circuit, compensation network, coupling coil, rectifier circuit and Buck circuit. Use an oscilloscope to measure the input and output waveforms.

[0035] Step 3, simulate and verify the control algorithm. Set disturbances, shifts and faults to observe the dynamic response of the control algorithm and the steady-state effect of the system.

[0036] Step 4, replace the simulation circuit with a hardware circuit. The real-time simulator (Speedgoat platform) runs the control algorithm. According to the application scenario, set different disturbances, shifts, etc. Adjust the algorithm to verify its effectiveness.

Claims

1. A method for quick development and verification of a wireless charging system, characterized in that, The method comprises the following steps: Step 1, under the actual design requirements, the characteristic parameters of the wireless charging system are determined, including the input and output levels; Step 2, the basic circuit parameters of the wireless charging system are determined, the open-loop main circuit physical model of the wireless charging system is built by using Matlab or PSIM software, and the open-loop simulation circuit is constructed; the running state of the wireless charging system is simulated by using the open-loop simulation circuit, the input and output of the wireless charging system in the steady state are observed, and the design result is verified, wherein the input and output expressions of the coupling coil and the model thereof established in the Matlab or PSIM software are as follows: where I tx,i and V rx,j represent the input current of the i-th input coil and the output voltage of the j-th output coil, respectively; ω = 2πf represents the angular frequency, f represents the system operating frequency; M ij represents the coupling between the i-th input coil and the j-th output coil; Step 3, after the open-loop verification of the wireless charging system is completed, the control strategy and the control circuit and the algorithm thereof are designed according to the open-loop simulation circuit, the closed-loop control circuit and the algorithm of each stage circuit of the wireless charging system are built on the Matlab, and the closed-loop characteristics of each stage circuit are verified one by one; then the stage circuits are cascaded, the system disturbance is designed, and the transient response and the steady state characteristics of the system when the disturbance is added are observed; Step 4, after the actual wireless charging system is built according to the simulation results of steps 1 to 3, the hardware open-loop characteristics of the actual wireless charging system are experimentally verified, and then the controller model and the control algorithm for controlling the actual wireless charging system are built on the development platform of the Speedgoat real-time simulator; the Speedgoat real-time simulator and the actual wireless charging system form a complete feedback closed-loop system, and the Speedgoat real-time simulator is used to observe how to adjust the control algorithm to maintain the stable output of the actual wireless charging system when the load offset, the input and output disturbance and the system fault occur; Step 5, after the actual controller is built, the wireless charging open-loop circuit of the actual wireless charging system is simulated by using the Speedgoat real-time simulator, and the real-time running state of the actual controller is observed, including the transient response and the steady state characteristics.

2. The method of claim 1, wherein the wireless charging system is a wireless power transfer system. The Speedgoat real-time simulator, the actual wireless charging system and the actual controller all adopt standard interfaces.

3. The method of claim 1, wherein the wireless charging system is a wireless power transfer system. The controller model and the control algorithm adjust the duty cycle of the DC / DC converter, the PWM input of the DC / AC converter and the PWM input of the synchronous rectification of the AC / DC converter in the actual wireless charging system in real time.

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