Patent ID: 7733673
Filing Date: 2010-06-08
Classification: H02M,Y02B

Abstract:
1. A controller for use in a power supply regulator, comprising: a feedback circuit coupled to generate an equivalent switching frequency signal in response to a sense signal from a power supply regulator output; a comparator coupled to compare the equivalent switching frequency signal with a reference signal; a period modulation circuit coupled to the feedback circuit to generate a period modulation switching signal in response to the equivalent switching frequency signal; and a multi-cycle modulator circuit coupled to the output of the comparator, the multi-cycle modulator circuit coupled to enable or disable a switch signal from the controller to be coupled to a switch of the power supply regulator, wherein a group of two or more consecutive switching cycles is separated from a next group having two or more switching cycles by a time of no switching, wherein the time of no switching is adjusted in closed loop to regulate a transfer of energy from a power supply regulator input to the power supply regulator output.