Design and Realization Based on the SPWM Sine Wave

PWM is one method of D/A transformation.When PWM modulation signal is sine wave,SPWM waveform is obtained.In sampling control theory,there is an important theory that its effect is basic same when the pulse with the impulse are equal but the shape is different.The principle of SPWM takes the conclusion as the rationale.The pluse width of SPWM is determined by method of equiralent area it carries on the operation using mathematics software MAPLE,according to strict sequential control output wave shape.Using the VHDL hardware description language to carry on the design to realize and use Max+PlusⅡto carry on the simulation confirmation,obtaining a group diaital signal along with pulse width change.According to the D/A switch principle,to make the SPWM profile tranforms into the sine wave and then output.