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Dummy load controllers and control methods for power supplies capable of quickly lowering output voltage at output node
Dummy load controllers and control methods for power supplies capable of quickly lowering output voltage at output node
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机译:能够快速降低输出节点输出电压的虚拟负载控制器和电源控制方法
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摘要
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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