基于STM32的单相不间断式UPS电源设计与实现

Design and Implementation of Single-Phase Uninterrupted UPS Power Supply Based on STM32

摘要: 本设计采用STM32单片机作为主控芯片，产生一路PWM波和双路互补的SPWM波，以全桥逆变电路为核心电路，实现单相不间断式UPS电源。采用以IR2103芯片和IR2110芯片为主的驱动电路驱动双向DC-DC电路和全桥逆变电路中的MOS管。电路使用高精度芯片AD637采集交流电压反馈至单片机通过PID算法调节PWM波输出的占空比。本电源输出电压较为稳定，负载调整率和电压调整率均在1%以下，且正弦波波形失真度在2%以下。本电源在交流供电时能够输出稳定30 V的交流电压，电流输出范围为1 A~2 A。直流供电时输出交流电压为30 V，电流在1 A左右，效率达到85%以上。

Abstract: STM32 single chip microcomputer (SCM) is used as the main control chip to generate one PWM wave and two complementary SPWM waves. The full-bridge inverter circuit is used as the core circuit to realize single-phase uninterrupted UPS power supply in this design. The drive circuit mainly composed of IR2103 chip and IR2110 chip is used to drive MOS transistors in bidirectional DC-DC circuit and full bridge inverter circuit. The circuit uses the high-precision chip AD637 to collect AC voltage and feed it back to the SCM to adjust the duty ratio of PWM wave output through PID algorithm. The output voltage of this power supply is relatively stable, the load regulation rate and voltage regulation rate are both below 1%, and the distortion of sine wave waveform is below 2%. The power supply can output a stable AC voltage of 30 V when supplying AC power, and the current output range is 1 A~2 A. When DC power is supplied, the output AC voltage is 30 V, the current is about 1 A, and the efficiency reaches more than 85%.