Patent ID: 6072708
Filing Date: 2000-06-06
Classification: H02J,H02M

Abstract:
A power supply for converting a voltage from an AC signal source at a first level to a regulated DC voltage at a lower level before delivery to a load, comprising:a transformer having a primary winding wound on a core and connected across the AC source and a secondary winding wound on said core, said transformer having a finite leakage inductance associated and integral with said primary winding;a rectification circuit connected to said secondary winding for rectifying the current therefrom for delivery to the load;a switching element for selectively allowing current to be delivered from the AC source through said transformer to the load, such that energy is transferred from the AC source to said leakage inductance for storage therein and subsequent transfer to the load; anda switch control for controlling said switching element to operate in a periodic mode, whereby the current to the load is measured and said switching element switched at a periodic rate and the conduction time of the switching element varied to adjust the current delivered to the load in such a manner that said switching element and said transformer with its associated leakage inductance is operated in a switching regulation manner wherein the series resistance of said leakage inductance is defined to insure that the RMS current is sufficiently minimized without detracting from the desired output average current.