Patent ID: 8749149
Filing Date: 2014-06-10
Classification: H05B

Abstract:
1. A lighting device comprising: a lighting unit configured to supply a lighting power to a light source unit including one or more solid-state light emitting elements by using a DC voltage from a power supply unit as an input; and a controller configured to control the lighting unit, wherein the lighting unit includes a diode for recovering a stored energy of the inductor for the light source unit during an OFF period of the switching element and a series circuit of an inductor and a switching element, and the controller includes a first unit configured to intermittently drive an ON/OFF operation of the switching element by a PWM signal and a second unit configured to drive the switching element by a frequency higher than that of the PWM signal during an ON period of the PWM signal, and when the PWM signal falls, the controller is configured to reduce a peak value of a load current flowing through the light source unit during a certain period.