Variable-frequency flyback converter with synchronous...

Details Variable-frequency flyback converter with synchronous... Variable-frequency flyback converter with synchronous...

2006-10-17

2006-10-17

Sterrett, Jeffrey (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

Reexamination Certificate

active

07123489

ABSTRACT:
Disclosed herein is a variable-frequency flyback. The flyback converter comprises a flyback transformer having secondary windings for drive and detection for providing first and second induced voltages induced from an input voltage in first and second turn ratios with a primary winding, respectively, a voltage detector for detecting the second induced voltage, a switching controller for determining, on the basis of a level of the voltage detected by the voltage detector, whether a current load state is the mini load state and outputting a first switching signal according to a result of the determination, a first switch for switching the supply of the second induced voltage in response to the second induced voltage and the first switching signal, and a synchronous rectifier for performing a switching operation depending on a state of the first switch, the synchronous rectifier having its source and drain connected to any one of a voltage output line or ground line connected to the drive secondary winding and its gate connected to the first switch.

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patent: 6430071 (2002-08-01), Haneda
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patent: 7012821 (2006-03-01), Park et al.
patent: 7042739 (2006-05-01), Nagai et al.

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