Switching power supply and display device provided the same
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United States of America Patent
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Jan 14, 2014
Grant Date -
Jun 14, 2012
app pub date -
Aug 25, 2011
filing date -
Dec 10, 2010
priority date (Note) -
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Abstract
A switching power supply has a function of improving a power factor, and outputs insulated DC. The switching power supply performs two kinds of controls for switching devices exclusive to each other: controlling of a switching device provided in a direction in which the discharging of a primary-side smoothing capacitor is prohibited at the time of suspension of commercially available AC power and near the zero cross of an input voltage; and causing a switching device provided between the output side of a third winding and the primary-side smoothing capacitor to control a charging current, thereby charging a capacitor in a boosted manner.
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