Patent ID: 8963425
Filing Date: 2015-02-24
Classification: H02M,H05B

Abstract:
1. A power supply device that supplies power to a semiconductor light source load and lights the semiconductor light source load, comprising: a DC-DC converter a controller that controls ON/OFF operations of the switching element so that an output current of the DC-DC converter can be the same as a target value, wherein a timing regulator that regulates timing of turning on the switching element is provided at least in the controller so that a current flowing through the inductance element can flow in a continuous mode operation, wherein the timing regulator is composed so as to detect a current flowing when the energy is discharged from the inductance element to the load side when the switching element is off, and to turn on the switching element when a value of the detected current becomes equal to or lower than a predetermined value, and wherein a time while the switching element is off is controlled to continue for at least a first predetermined minimum time, and to not continue beyond a second predetermined maximum time that is higher than the first predetermined minimum time.