Patent ID: 9240737
Filing Date: 2016-01-19
CPC Classification: F25B,H02M,Y02B

Claim Text:
1. A control device for a switching power supply circuit, including a pair of input terminals, a pair of output terminals, and a first and a second chopper circuits which are parallely connected to each other between said pair of input terminals and said pair of output terminals and each of which performs a chopping operation, wherein a constant-voltage source is connected between said pair of input terminals, the control device comprising: a mode controller which shifts an operation mode of said first and said second chopper circuits from a first mode to a third mode via a second mode as an electric power in said first and second chopper circuits increases; an operation controller which causes, in said first mode, said first chopper circuit to perform said chopping operation, and said second chopper circuit to suspend said chopping operation, in said second mode, causes said first chopper circuit and said second chopper circuit to alternately perform said chopping operation, and in said third mode, causes both of said first chopper circuit and said chopper circuit to perform said chopping operation; and a current detection unit which detects an input current flowing through said pair of input terminals, wherein said mode controller shifts said operation mode from said first mode to said third mode via said second mode as said input current increases.