Switching power supply and image forming apparatus equipped with switching power supply
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United States of America Patent
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Mar 29, 2016
Grant Date -
Apr 10, 2014
app pub date -
Oct 4, 2013
filing date -
Oct 10, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A power supply device including a transformer having a primary winding and a secondary winding, and a switching element connected to the primary winding configured to drive the switching element to output voltage from the secondary winding includes a control unit configured to drive the switching element such that the switching element is turned on and, in which, in a case where the control unit performs an intermittent drive operation which repeats a period for which the switching element is driven and a period for which the drive of the switching element is stopped, in which the control unit drives the switching element such that the switching element is turned off before the voltage according to the current flowing to the primary winding reaches the voltage output from the secondary winding in the period for which the switching element is driven.
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