The Generating Method of SPWM with Double-Interruption Based on DSP

Aiming at the wide application of SPWM sinusoidal modulation wave in the inverter circuit, the paper introduces a method of generating SPWM wave according to asymmetric regular sampling with the period and overflow interrupts of the event manager based on digital signal processor TMS320F2812, and adopts some harmonic suppression methods to obtain output waveform of high-precision. With the real-time processing ability and control peripheral equipments functions, the digital signal processor (DSP), can greatly improve control accuracy and real-time control ability. Applying the programming method with double-interruption to the 5 kW power of frequency inverter, through the spectrum analysis with the output-voltage, we find that the double-interruption sampling method is better than the single-interruption sampling method.