大功率直流开关电源模块控制系统设计-电子与通信工程专业论文.docxVIP

Design High Power DC Switching Power Module’s Control System ABSTRACT In the future,modular and digital is one of the main development trend of switch power,according to the need of AC-DC-DC high power switch power,the digital control system is designed.The control system of switch power takes STM32F103 embedded controller as the control core, and then hardware and software are designed. SPWM control signal of high frequency rectifier circuit and the phase shift PWM control signal of soft switch are the key point in the hardware design, in addition, the control system’s basic circuit, peripheral circuit, peripheral interface, simple interactive interfaces, etc. The control system’s basic circuit includes processor, clock circuit, power circuit, reset circuit, and so on; Peripheral circuit includes detection circuit, polar conversion and isolation circuit ; Peripheral interface includes A/D conversion interface, CAN bus, JTAG debug interface, etc. High frequency rectifier can effectively reduce grid harmonic pollution, which needs to generate SPWM signal,then the special SPWM generator based on FPGA is designed. This generator overcome the defects that the special SPWM chips, which designed for inverter, can’t synchronize with the voltage of AC grid. Different frequency and phase, communication interface are simulated in the QUARTUS Ⅱ 9.0 software environment. The results show that the generated SPWM has the features of well symmetry, adjustable phase and frequency, which can satisfy the demand of harmonic suppression and power factor adjustment, at the same time, it has communication interface, therefore, it has a board application prospect. Soft switch technology can reduce switch loss of switch power, which lead to the miniaturization of the switch power, and the phase shift PWM technology is used for soft switch. But the frequency and phase of PWM chips can’t reach and have communication interface, therefore the special PWM generator based on FPGA is