Patent ID: 6043635
Filing Date: 2000-03-28
Classification: H02M,H05B

Abstract:
A power supply which operates from a switched leg and which includes a first switch for controlling the flow of current through the switched leg comprising:an inductor;a capacitor coupled to the inductor;a second switch, coupled in series with the inductor, wherein the second switch, inductor and capacitor are coupled across the first switch such that the inductor receives current from the power line only when the first switch is open and the second switch is closed; anda control circuit coupled to the first switch and second switch for periodically switching the second switch and for (i) opening the first switch when the second switch is closed to provide current to the inductor for the condition where the first switch is closed so as to allow current to flow in the switched leg, and (ii) leaving the first switch open when the second switch is closed for the condition where the first switch is not providing current in the switched leg.