Power supply circuit
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United States of America Patent
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May 2, 2017
Issued Date -
N/A
app pub date -
Apr 17, 2014
filing date -
Apr 19, 2013
priority date (Note) -
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Abstract
A power supply circuit 1 includes an output circuit that generates an output voltage by performing a power supply operation based on an input voltage, an output terminal to which, after start-up of the power supply operation, the output voltage is applied, and a control circuit that causes a test current to flow between the output terminal and a ground. The control circuit detects, as a test voltage, a voltage at the output terminal in a test period in which the test current is caused to flow. When the test voltage at a predetermined judgment timing is lower than a judgment voltage, the control circuit judges that an output capacitor is connected and thus enables the power supply operation.
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