Patent ID: 8148906
Filing Date: 2012-04-03
Classification: H02M,H05B

Abstract:
1. A constant current switching power supply apparatus comprising: a switching element connected in series with a load, and configured to turn on and off a DC current supplied to the load; a current detecting element configured to detect a value of the current flowing through the load; an analog-to-digital converter configured to convert the value of the current as detected by the current detecting element from an analog value to a digital value; an arithmetic processing circuit configured to perform feedback control over the current supplied to the load, based on a value obtained by multiplying a deviation of the value of the current detected by the current detecting element from a target value of the current flowing through the load, by a proportional gain; wherein said arithmetic processing circuit sets the value of the gain to a predetermined value immediately after the switching element is turned on, and reduces the value of the gain with time after the turn on of the switching element.