Switching power supply device
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United States of America Patent
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Jan 16, 2018
Issued Date -
N/A
app pub date -
Feb 1, 2017
filing date -
Oct 14, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A switching power supply device of the present disclosure includes a device connection state detection circuit that detects a connection state in a load device connection terminal, in a power supply system having the load device connection terminal. The device connection state detection circuit includes a transformer, a switching element, a pulse generator, and a waveform detection circuit. The waveform detection circuit detects a voltage or a current generated at a connecting point between a primary winding wire of the transformer and the switching element in response to operation of a pulse signal. The waveform detection circuit compares the voltage or the current with a predetermined reference value, and outputs an output signal in response to a comparison result to an OFF terminal.
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