ACTIVE ISOLATED POWER SUPPLY WITH MULTIPLE OUTPUTS
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United States of America Patent
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Issued Date -
Apr 4, 2013
app pub date -
Apr 11, 2012
filing date -
Sep 30, 2011
priority date (Note) -
Abandoned
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Abstract
An active isolated power supply with multiple outputs is provided. The power supply includes N transformers T1˜Tn connected to output terminals of AC source, the primary circuits of transformers T1˜Tn are connected in parallel with each other, wherein N is a positive integral number equals to or greater than 2, and N switching devices S1˜Sn or N−1 switching devices S1˜Sn−1 connected in series with the primary circuits of transformers T1˜Tn respectively, to restrict the current direction of the primary circuits of transformers T1˜Tn. Herein, N output power supplies isolated with each other are generated on the secondary sides of transformers T1˜Tn. Therefore, flow direction of current in the primary sides of the transformers is fixed by present invention, such that each transformer can accomplish magnetic reset in one operation period, thereby avoiding the occurrence of current circulation between the primary circuits.
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