Design and Implementation of Three-phase Sine Wave AC Power Supply Based on the Embedded System STM32

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%.