Over-voltage protection circuit for a switched mode power...

Electric power conversion systems – Current conversion – Including automatic or integral protection means

Reexamination Certificate

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Details

C361S018000, C361S090000

Reexamination Certificate

active

11114208

ABSTRACT:
The switched mode power supply comprises an inductor, a switching transistor, a controller circuit coupled to the switching transistor, a rectifying means and a feedback regulation loop for providing a stabilised output voltage. It comprises further a protection circuit coupled to an output or input of a comparator of the controller circuit for providing an overvoltage protection in case of a failure of the regulation loop. The protection circuit comprises in particular an integrating circuit and a comparating circuit. In a preferred embodiment, an output of the protection circuit is coupled to a sense input of the controller circuit, for switching off the controller circuit immediately in case of a failure. In another aspect of the invention, the protection circuit comprises further a second comparator coupled to the first comparating circuit for the surveillance of the input voltage of the switched mode power supply, and for the detection of a short circuit of the inductor or the rectifying means.

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patent: WO 96/28878 (1996-09-01), None
Unitrode Corporation, UC3854 Datasheet, High ower Factor Preregulator, Unitrode, Jun. 1998, pp. 1-9.
Search Report dated Nov. 12, 2004.

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