Dummy load controllers and control methods for power supplies capable of quickly lowering output voltage at output node
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United States of America Patent
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Nov 21, 2017
Grant Date -
Dec 10, 2015
app pub date -
May 20, 2015
filing date -
Jun 4, 2014
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Abstract
A power converter provides a dummy load to lower an output voltage under a light-load or no-load condition. The power converter has a primary winding and a secondary winding isolated from each other. The secondary winding can de-energize to provide the output voltage at an output node for powering a load. The winding voltage at across the secondary winding is sensed to provide a non-switching time, which is checked if it exceeds a predetermined reference time. The output voltage is compared with a predetermined voltage. A discharge current is provided as the dummy load to drain from the output node and to lower the output voltage if the on-switching time exceeds the predetermined reference time and the output voltage exceeds the predetermined voltage.
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