Patent ID: 6044000
Filing Date: 2000-03-28
Classification: H02M,Y02B

Abstract:
Switched-mode power supply for supplying a DC-fed load by a stepped-up, stabilized DC voltage formed from an AC mains voltage by means of a rectifier circuit, a charging inductor, and a switch controlled by a control unit and having a switching path connected in parallel with dc voltage outputs of the rectifier circuit, and a charge storage arrangement connected in parallel with the switching path of the switch and having supply terminals for the DC-fed load for feeding in the stabilized DC voltage, characterized in that the charging inductor (L1) is arranged in a line path between a high potential (L) of the AC mains voltage (U) and the rectifier circuit (D1 to D4) and has an auxiliary winding (L1s) with terminals on a secondary side, a signal evaluation unit (3) for a floating evaluation of an instantaneous charge state of the charging inductor is connected to the auxiliary-winding terminals on the secondary side and also has signal outputs connected to assigned signal inputs of the control unit for transferring input control signals (Uli, Ust, Io) into the control unit.