Power supply having a synchronous rectifier circuit for improved

Details Power supply having a synchronous rectifier circuit for improved Power supply having a synchronous rectifier circuit for improved

1998-08-03

1999-08-31

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 89, 363 21, H02M 3335, H02M 542, H02M 7217

Patent

active

059462078

ABSTRACT:
A power supply includes a transformer (TR) having a first winding (N1) for receiving an input signal (U.sub.i) and a second winding (N2) for supplying an output signal (U.sub.o). Switching means (SM) are coupled in series with the first winding (N1) for switching on and switching off a current through the first winding (N1). A parallel arrangement of a freewheel diode (D) and a field effect transistor (T) is coupled in series with the second winding (N2). The gate of the field effect transistor (T) is controlled from an amplifier (AMP). The amplifier (AMP) compares the drain-source voltage of the field effect transistor (T) with the voltage of a reference voltage source (RF1) and ensures that the drain-source voltage is equal to the voltage of the reference voltage source (RF1) as long as an adequate current flows in the second winding (N2).

REFERENCES:
patent: 5396412 (1995-03-01), Barlage
patent: 5818704 (1998-10-01), Martinez

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