Patent ID: 6134123
Filing Date: 2000-10-17
Classification: H02M

Abstract:
A switch-mode dc power supply comprising:(a) a series circuit comprising a primary winding of a HF transformer, a semiconductor switching element and a current detection unit connected between two output terminals of a rectifier/smoothing circuit;(b) a rectifier, connected to a end of a secondary winding of said HF transformer;(c) an output smoothing circuit connected between said rectifier and other end of said HF transformer;(d) a detection circuit connected to a connection point between said rectifier and said output smoothing circuit;(e) an adding circuit connected between said detection circuit and a connection point between said semiconductor switching element and said current detection unit;(f) a triangular wave generator connected to said adding circuit; and(g) a control signal generator connected between said adding circuit and a control electrode of said semiconductor switching element, and further connected to said triangular wave generator.