Patent ID: 9667141
Date: 2017-05-30
CPC Classifications: H02M

Claim:
1. A switching power supply comprising: a switching type power supply circuit configured to convert an input voltage to generate an output voltage; and a control integrated circuit configured to execute feedback control that, based on a differential voltage between a target voltage and the output voltage from the power supply circuit, controls a switching element of the power supply circuit and causes the output voltage from the power supply circuit to converge to the target voltage, wherein the control integrated circuit sets a this-time value of the target voltage based on a first value obtained by adding a preset value to a previous value of the target voltage at a time of startup of the power supply circuit, the control integrated circuit sets a second value obtained by adding the preset value to the output voltage as an initial value of the target voltage at the time of startup of the power supply circuit, and the output voltage immediately before start of the startup of the power supply circuit is a certain voltage and a voltage less than a predetermined final target voltage under influence of a load state of a load device connected to the power supply circuit.