Patent ID: 9036383
Filing Date: 2015-05-19
Classification: H02M

Abstract:
1. A power supply device control circuit which, based on turning-on/turning-off of a switching element, converts rectified alternating current input voltage into direct current output voltage, and supplies it to a load, comprising: a peak current reaching time detection circuit which detects a peak current reaching time needed until current flowing through the switching element reaches peak current; a difference voltage detection circuit, including an A time detection circuit which detects an A time which is A (0<A<1) times as long as an ON time of the preceding cycle of the switching element, which detects difference voltage between reference voltage used when detecting overcurrent flowing to the load and a value of a current signal which has detected current flowing through the switching element at the A time; and a delay time adjustment circuit which, based on at least one of the peak current reaching time and difference voltage, carries out adjustment and control of a delay time occurring until the time when the switching element is turned off after detecting the overcurrent.