Electric power conversion systems – Current conversion – Including automatic or integral protection means
Reexamination Certificate
2008-05-27
2008-05-27
Sterrett, Jeffrey L. (Department: 2838)
Electric power conversion systems
Current conversion
Including automatic or integral protection means
C361S018000, C361S090000
Reexamination Certificate
active
07379310
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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Unitrode Corporation, UC3854 Datasheet, High ower Factor Preregulator, Unitrode, Jun. 1998, pp. 1-9.
Search Report dated Nov. 12, 2004.
Grellmann Harald
Lopez Daniel
Louvel Jean-Paul
Behm Harry
Laks Joseph J.
Levy Robert B.
Sterrett Jeffrey L.
Thomson Licensing
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