SWITCHING POWER SUPPLY DEVICE AND METHOD FOR CIRCUIT DESIGN OF THE SWITCHING POWER SUPPLY DEVICE
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United States of America Patent
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Issued Date -
Apr 3, 2014
app pub date -
Sep 27, 2013
filing date -
Sep 28, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A switching power supply device includes a rectifying circuit configured to rectify an AC voltage and to output a rectified voltage, a smoothing capacitor configured to smooth the rectified voltage and to output a smoothed voltage, a first DC-DC converter configured to convert the smoothed voltage into an intermediate voltage and to output the intermediate voltage, and a second DC-DC converter configured to convert the intermediate voltage into an output voltage and to output the output voltage substantially free of ripple. The first DC-DC converter is configured to perform a step-up operation, a step-up/down operation, and a step-down operation according to the smoothed voltage, and to output the intermediate voltage including a ripple or the intermediate voltage substantially free of ripple.
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