Reverse current protection circuit for switching power supply

Details Reverse current protection circuit for switching power supply Reverse current protection circuit for switching power supply

2008-07-01

2008-07-01

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

Reexamination Certificate

active

11124929

ABSTRACT:
A reverse current protection circuit is provided to protect the internal circuit components of a switching power supply from being damaged by a reverse current discharging from an input filtering capacitor. The reverse current protection circuit according to a preferred embodiment includes a transistor switch coupled between an input terminal and the input filtering capacitor. The reverse current protection circuit also includes a surveillance device for monitoring the change of a voltage polarity across the current-conducting terminals of the transistor switch and generating a driving signal if the voltage polarity across the current-conducting terminals of the transistor switch is changed. The reverse current protection circuit also includes a signal coupler for coupling the driving signal to the control terminal of the transistor switch in order to turn off the transistor switch so as to block the discharging loop of the reverse current.

REFERENCES:
patent: 4825349 (1989-04-01), Marcel
patent: 6229291 (2001-05-01), Matsumura et al.

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