Patent ID: 8836239
Filing Date: 2014-09-16
Classification: H05B

Abstract:
1. An LED lighting device comprising: a power converting unit configured to convert a power source voltage to a DC voltage and output the DC voltage to an LED unit; and an output control unit configured to control an output of the power converting unit, wherein the power converting unit has a chopper circuit including a series circuit of a primary coil of an inductance element and a capacitor; a switching element which is connected to the primary coil of the inductance element in series and turned on and off by the output control unit; and a diode serving as a discharging path of the primary coil of the inductance element during an OFF state of the switching element, wherein an operating voltage of the output control unit is obtained from a voltage generated in a secondary coil of the inductance element, and the output control unit controls an on-duty ratio of the switching element during an initial time period after a lighting operation is started to be smaller than that during a steady state of the lighting operation so that a current supplied to the LED unit during the initial time period is smaller than that during the steady state.