High efficiency universal input switching power supply
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United States of America Patent
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Jul 10, 2012
Grant Date -
Jul 1, 2010
app pub date -
Dec 4, 2009
filing date -
Dec 26, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A universal input switching power supply has the rectifier, a signal detecting unit detecting a voltage of an external AC power and outputting a detecting signal, a PFC circuit converts a first DC power from the rectifier to a second DC power with different voltage according to the detecting signal; and a parallel and serial type DC to DC converter converting the second DC power with different voltage to a constant voltage of the third DC power. The parallel and serial type DC to DC converter has a transformer having a primary and secondary coils and physically changes a turn ratio of the primary and secondary coils of a transformer thereof according to a voltage ratio of the second DC power and the third DC power. Accordingly, the universal input switching power supply has good transforming efficiency at different AC power source conditions.
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