Research on producing SPWM wave based on SOC and DDS

The basic principle of DDS(Direct Digital Synthesizer)and PWM(Pulse-Width Modulation)are introduced.Using DDS COMS chip AD9833,a DDS circuit is designed,which includes a numerical controlling surge adopting 28 bits phase adder,a sine ROM and a 10 bits D/A transformer.The C8051F020 of DDS is proposed to optimize the PWM wave.Based on DDS,the PWM wave producing is studied and explored.Then according to the characteristics that output voltage wave with little resonances,steady voltage and steady frequency with high precision,the import with 110V/60Hz/10kW is designed.