Direct current power supply device, motor driving device, air conditioner, and refrigerator
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United States of America Patent
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Apr 18, 2017
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N/A
app pub date -
Oct 18, 2013
filing date -
Oct 18, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A direct-current power supply device includes a rectifier connected to a power supply, a charge storage unit configured by a first capacitor and a second capacitor connected in series, a switching unit configured by a first switching element 4a and a second switching element connected in series and backflow preventing elements that suppress a backflow of electric charges from the charge storage unit, a reactor, a control unit that controls operations of the first switching element and the second switching element, and a direct-current-voltage detecting unit that detects a first both-end voltage, which is a voltage across the first capacitor, and a second both-end voltage, which is a voltage across the second capacitor. The control unit detects, on the basis of a voltage difference between the first both-end voltage and the second both-end voltage, a short-circuit failure of one of the first switching element and the second switching element.
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