AC-DC converter
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United States of America Patent
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Oct 10, 1995
Grant Date -
N/A
app pub date -
Sep 28, 1993
filing date -
Oct 2, 1992
priority date (Note) -
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Abstract
A power-factor improved AC-DC converter has a rectifier circuit, a booster converter circuit and a DC-DC converter circuit. A winding on a converter transformer of the DC-DC converter circuit supplies power to both a DC-DC converter control circuit and a booster converter control circuit. In starting up the AC-DC converter, the DC-DC converter circuit is started first, followed by start of operation of the booster converter circuit. With this arrangement, power-factor improved AC-DC converter can be realized with minimum increase in the size and production cost, and the start-up characteristic is improved to avoid failure of start up of the AC-DC converter.
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