Research And Design Of Hardware-in-Loop-on-Chip Simulation System

With the increasing scale and complexity of power electronic systems,Hardware-in-the-loop(HIL)simulation technology is increasingly used in system development and design.This paper studies and designs an on-chip hardware-in-the-loop simulation system,which is composed of a dual-core floating-point Digital Signal Processor(DSP),an isolated analog digital output interface and a man-machine interface.One core(simulation core)in the dual-core floating-point DSP is used to simulate the experimental object,and the other core(control core)is used to control the experimental object.The data interaction of dual cores can realize the open-loop characteristic test and closed-loop control of the experimental objects.A hardware-in-the-loop simulation system based on the computing resources of a single-chip processor is realized.The paper proposes and studies the architecture of a dual-core on-chip hardware-in-the-loop(HILoC)simulation system,and designs a high-speed digital exchange sequence based on interrupt coordination between the system simulation core and the digital control core.Numerical modeling of the target object and an algorithm for accelerating iteration within the numerical equation system are proposed.In order to realize the interactivity,visualization of the simulation and the migration of HIL to the physical design of the hardware,the peripheral resources of TMS320F28379D are allocated,and the isolated digital and analog input and output circuits,auxiliary power supply circuits and man-machine interface circuits are designed.The on-chip hardware-in-the-loop system has the following functions:1.Real-time simulation of objects;2.Closed-loop interaction between physical digital controllers and virtual(numerical simulation)objects;3.Migration verification from hardware-in-the-loop design to physical closed-loop systems.Taking Buck circuit as the simulation object,the transient response of the system under input disturbance,load disturbance and duty cycle disturbance was simulated and verified.The simulation verification of hardware-in-the-loop(real controller)is carried out under input disturbance and load disturbance,and a comparative experiment with the commercial Typhoon HIL simulator is carried out to verify the effectiveness of the on-chip hardware-in-the-loop simulation system.Taking the physical Buck converter as the control object,the experimental verification of the effectiveness of the design migration from the hardware in the loop to the physical hardware is carried out.The results show that under the same controller parameters,the closed-loop control of the physical objects can be realized,and the connected physical hardware circuit can be tested in the operating environment that meets the real system performance indicators,and the simulation effect is close to the real operating conditions.The HILoC system proposed in this paper can not only verify the design performance of the controller through the simulation platform,but also reflect truly the dynamic characteristics and static characteristics of the controller.Meanwhile,the system reduces the risk of the actual system under various extreme conditions,and improve the authenticity of simulation and development efficiency.