Patent ID: 7932704
Filing Date: 2011-04-26
Classification: H02M

Abstract:
1. A modulator for providing control pulses on a pulse control signal which controls operation of a DC-DC converter, comprising: a comparator which compares a periodic timing waveform with a compensation signal and which provides a comparison signal with preliminary pulses; a pulse logic circuit having an input receiving said comparison signal and an output providing normal pulses on a normal pulse signal, wherein said pulse logic circuit selects only those of said preliminary pulses which are provided during a permissible time window of each period of said periodic timing waveform as said normal pulses provided on said normal pulse signal; a memory circuit which provides a no pulse indication whenever a normal pulse does not occur on said normal pulse signal during any period of said periodic timing waveform; and a switch circuit which selects between said normal pulse signal and said comparison signal based on said no pulse indication for providing the control pulses on the pulse control signal.