Switching control circuit for a switching power converter

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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Details

C363S049000

Reexamination Certificate

active

08054656

ABSTRACT:
A switching control circuit is coupled to a switching device and an auxiliary winding of a transformer, wherein a primary winding of the transformer is coupled to the switching device. The switching control circuit includes a voltage receiver, a comparing unit and a propagation delay circuit, wherein the voltage receiver is coupled to the auxiliary winding of the transformer for receiving a reflected voltage signal and transforming the reflected voltage signal into a peak voltage signal, while the switching device is turned off. The comparing unit is coupled to the voltage receiver for receiving the peak voltage signal and a first threshold voltage, and outputting a comparison result. The propagation delay circuit is coupled to the comparing unit for receiving the comparison result, and outputting a PWM signal to turn on the switching device after a delay time.

REFERENCES:
patent: 7054170 (2006-05-01), Yang et al.

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