Flyback converter power supply with a semi-conductor switch of low resistance voltage

摘要

The flyback-converter switched-mode power supply has a semiconductor switching element (switch) for clocked application of a DC voltage to a first primary winding of a transformer, with a control device for controlling the semiconductor switching element as well as a capacitive device which has a predetermined capacitance and is connected parallel to the load section of the semiconductor switching element. The capacitance of this capacitive device can be altered, at least from a first value, to a second, smaller value, when a voltage drop at the load section of the semiconductor switch element is smaller than the D.C. voltage which should be switched. IMAGE