SPWM based on programmable counter array

For the complexity of sinusoidal pulse width modulation, which have problems of slow response, trivial program and expensive realization device, programmable counter array is used in this paper to realize the SPWM with low cost in order to be used in the design of variable velocity variable frequency (VVVF). This method has the feature of fast responding and cheap device, so it can be used in general the system of variable velocity variable frequency. It has been approved through the experiment to be effective and has realized this method into products.