Digital pulse width modulator

Abstract

The invention provides a multi-phase digital pulse width modulator (MP-DPWM) to implement a distribution scheme which applies the duty cycle in the fastest possible manner with restriction on the number of switching actions per phase and cycle, and additionally takes the number of available phases into account. It modulates switching signals according to a duty cycle input command, their previous switching states, and the current switching cycle. The controller is adapted to additionally take the residue of the previous subcycle into account. In the control scheme: each phase is allowed switch up to twice per cycle; only the next phase in the cycle is additionally turned on, at the start of a subcycle, and if a phase is still on at the end of a subcycle it can be kept on for longer, if required.

Dependencies are inferred from the claim text.