三相逆变电源设计与实现

设计一款三相逆变交流电源,输出正弦信号频率为50Hz,负载Y型连接时线电压有效值可达24V,负载线电流有效值最大为2A。系统由三相逆变驱动主电路、滤波电路、STM32最小系统、信号隔离电路、SPWM(正弦脉宽调制)信号发生器、电压和电流测量电路和LCD显示等功能电路组成。测试结果表明,室温下输入直流电压为36V,负载线电流有效值Io在0~2A间变化时,各相负载调整率不大于0.3%,电能转换效率可达88%。

Design and implementation of three-phase inverter power supply

Because of inverter power supply with high power consumption, low transfer efficiency rate, a three-phase sine wave AC power supply is designed based on the embedded system STM32 which has the advantage of low power consumption and high speed. It has the capacity of output frequency of 50 Hz, the RMS of line voltage and current of star load connection up to 24V and 2A. The system consists of a three-phase inverter drive circuit, filter circuit, STM32 minimum system, the isolation circuit, SPWM (sinusoidal pulse width modulation) signal generator, measurement circuit of voltage and current and LCD display circuit. The experiments show that when the input voltage is set at 36V at room temperature and the line current of load is 0~2A, the load regulation rate is less than 0.3% and transfer efficiency can reach 88%.