Patent ID: 8253397
Filing Date: 2012-08-28
Classification: H02M,Y02B

Abstract:
1. A method to enhance efficiency in a switching converter system, comprising: in a first operational mode, alternately switching first and second transistors with a feedback-controlled duty cycle D to thereby realize an inductor current that maintains an output voltage V in a second operational mode, after said output voltage decays to a lower threshold over a decay time, alternately switching said first and second transistors a sufficient number of times to raise said output voltage to an upper threshold; transitioning to said second operational mode when current peaks of said inductor current drop below a predetermined current threshold; and transitioning to said first operational mode when said output voltage drops to a predetermined reference voltage; wherein said transitioning to said first operational mode step includes the steps of: providing an enable signal when said output voltage drops below said lower threshold and removing said enable signal when said output voltage rises above said upper threshold; and generating, in response to said enable signal, a control signal having a first state to signal said controller to turn on said first transistor and a succeeding second state to signal said controller to turn on said second transistor.