The hardware and software realization of three-phase frequency converter based on Sunplus SPMC75F2413A is introduced. Then the snubber circuit of IGBT is analyzed and the theory calculation and design method are given out. The result shows that frequency converter realized the closed-loop stabilizing of the voltage, overflow protection and open-phase protection as well as the VVVF control of motor by adapting language C Programming, designing realization control programme of VVVF and using debugging software of LABVIEW.