Switching power-supply device
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United States of America Patent
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Apr 4, 2017
Grant Date -
Sep 3, 2015
app pub date -
Feb 25, 2015
filing date -
Feb 28, 2014
priority date (Note) -
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Abstract
A switching power-supply device, in which an input power is applied to a primary winding of a transformer, a pulse voltage is induced in a secondary winding of the transformer by turning on and off a switching element connected to the primary winding of the transformer and an output voltage rectified and smoothed by a secondary-side rectifying-and-smoothing circuit having a rectifier diode and a smoothing capacitor is outputted. The switching power-supply device includes: a transient state detection circuit, which detects a transient state and outputs a soft-drive instruction signal; and a drive circuit which turns on-and-off the switching element in a soft-drive operation, in which a charging speed of a gate voltage at a time of passing a gate threshold voltage is delayed as compared to a normal operation, in a case where the soft-drive instruction signal is inputted.
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