Switching power supply, control circuit for controlling switching power supply, control method of switching power supply and module substrate
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United States of America Patent
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Apr 23, 2013
Grant Date -
Sep 2, 2010
app pub date -
May 3, 2010
filing date -
Nov 7, 2007
priority date (Note) -
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Abstract
A switching power supply includes: a first switch provided between a positive terminal of a DC power supply and a positive terminal of a load; a second switch connected in parallel with the first switch; a first capacitor provided between the second switch and a node of the first switch on a DC power supply side; a first inductor provided between the first capacitor and the positive terminal of the DC power supply; and a control circuit that turns off the second switch after the first switch is turned off and when or before a voltage across the first capacitor becomes zero.
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