Method and device of PWM control

摘要

In a fully digital PWM controller employing a sine-triangle modulating technique, the step of linearizing the dependence of the selected scanning frequency of the memory containing the digital samples of the modulating sinusoid, from the value of the digital selection datum, improves regulation at low speed by improving the resolution of selectable frequency values. The PWM driving signals produced by a fully digital controller implementing the linearization step of the invention show an F.F.T. extremely close to the F.F.T. of comparable PWM driving signals produced through a conventional analog technique. <IMAGE>