Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2007-05-01
2007-05-01
Nguyen, Matthew V. (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021010, C363S021070
Reexamination Certificate
active
11427505
ABSTRACT:
A transformer has a primary winding connected to a pair of DC input terminals via an active switch, and a secondary winding connected to a pair of DC output terminals via a first rectifying and smoothing circuit. The active switch is driven constantly under normal load, and at intervals under light load, under the direction of a switch control circuit. This switch control circuit is powered with a control voltage fed from a second rectifying and smoothing circuit which is connected to a tertiary winding of the transformer. In order to preclude malfunctioning or nonoperation in the event of an abnormal drop of the control voltage during operation in light load mode, the switch control circuit is equipped to drive the active switch at shorter intervals in control voltage recovery mode when the control voltage falls below a predefined limit than the normal intervals of the light load mode.
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Nguyen Matthew V.
Sanken Electric Co. Ltd.
Woodcock & Washburn LLP
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