Load detection circuit and dual-output power supply having the same
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United States of America Patent
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Dec 4, 2018
Grant Date -
N/A
app pub date -
Apr 25, 2018
filing date -
Apr 25, 2018
priority date (Note) -
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Abstract
A load detection circuit is applied to a power converter, and the power converter provides a switch switching frequency to control a switch output voltage. The load detection circuit includes a voltage adjustment unit, an integration unit, and a power switch. The voltage adjustment unit receives the switch output voltage provided from the power converter and adjusts the switch output voltage into an adjustment voltage. The integration unit is coupled to the voltage adjustment unit to receive the adjustment voltage and integrate the adjustment voltage to provide a control voltage. The power switch is coupled to the integration unit to receive the control voltage. When the switch switching frequency is increased to make the control voltage large enough to turn on the power switch, the load detection circuit detects that the power converter is changed from a no-loading condition to a loading condition.
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