The Generation of Three-Phase SPWM Wave Based on FPGA

Abstract

This paper presents a method of generating the three-phase SPWM wave based on FPGA. In a three-phase PV inverters or other using DC to converte into a three-phase AC system,it can be used as six IGBT gate drive signals of a three-phase inverter bridge.This article analysed the principle of the three-phase inverter circuit , obtaining the waveform of the three-phase SPWM wave. The 60 SPWM wave of each sine wave at 50Hz,it designs the hardware circuit to generate the waveform. Hardware circuit of hardware programming language makes the simulation of the three-phase drive waveform in Quartus II,and the program is downloaded into FPGA chip Cyclone II EP2C8Q208N to get waveform output. This design uses a counter method, checking ROM table to determine the preset value of the counter, and the output pulse width control can be achieved by changing the size of the preset value. We designes a three-phase adjustable power using this method and achieved the intended purpose.