Switched mode power supply having a discharge circuit for an aux

Details Switched mode power supply having a discharge circuit for an aux Switched mode power supply having a discharge circuit for an aux

1991-05-02

1992-08-18

Voeltz,, Emanuel

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, 323299, 361 91, 361111, H02M 3335

Patent

active

051405113

ABSTRACT:
A switched-mode power supply including a primary rectifying circuit connected to an AC power supply, a transformer connected to the primary rectifying circuit, a secondary rectifying circuit connected to the secondary side of the transformer, a voltage fluctuation detector for sensing fluctuation in the output voltage, a signal generator for generating switching signals in response to the fluctuation detector, a switching tansistor for shunting the transformer to ground in response to the switching signals, a protective circuit responsive to the output voltage for stopping any abnormal operation of the switching signal generator, and an auxiliary power circuit for supplying power to the switching signal generator and to the protective circuit. The power supply further comprises an AC power cut-off detecting circuit for detecting whether the AC power is interrupted and a discharge circuit for discharging any residual electric charge of the auxiliary power circuit according to the output of the detecting circuit.

REFERENCES:
patent: 4156273 (1979-05-01), Sato
patent: 4236187 (1980-11-01), Mochizuki et al.
patent: 4459651 (1984-07-01), Fenter
patent: 4956761 (1990-09-01), Higashi

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