Dc-to-dc converter with flyback period detector circuit

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

Reexamination Certificate

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Details

C363S056010, C363S021120

Reexamination Certificate

active

06842350

ABSTRACT:
A dc-to-dc converter includes a transformer having a primary winding connected to an input rectifying and smoothing circuit via an FET or like switching device, and a secondary winding connected to an output rectifying and smoothing circuit. A resonance capacitor is connected in parallel with the switching device. A switch control circuit cyclically turns the switching device on and off so as to keep constant the output voltage of the output rectifying and smoothing circuit by feedback control. The switch control circuit drives the switching device in light load mode when a flyback voltage developed by the transformer terminates earlier than each clock pulse, and in heavy load mode, in which each on-off cycle of the switching device is longer than in the light load mode, when the flyback voltage terminates later than each clock pulse.

REFERENCES:
patent: 6038146 (2000-03-01), Luo et al.
patent: 6515876 (2003-02-01), Koike et al.
patent: 6751104 (2004-06-01), Qiao et al.
patent: 09-140128 (1997-05-01), None

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