Patent ID: 9398672
Filing Date: 2016-07-19
CPC Classification: H05B,Y02B

Claim Text:
1. A lighting device comprising: a direct current (DC) converter including at least an inductor, a switching unit and a diode and being configured to output an energy accumulated in the inductor to a load via the diode by using an input from a DC power source when the switching unit is turned off; a load voltage detection unit connected to the load to detect a load voltage of the load; an abnormality determining unit configured to determine an abnormality when the load voltage is equal to or less than a preset threshold voltage; and an output control unit configured to drive the switching unit so that oscillation of the switching unit is stopped or the output of the DC converter is decreased when the abnormality is determined, wherein the DC converter includes a discharge resistor connected in parallel with the load, the load is a module including light emitting elements connected in series, and a resistance of the discharge resistor is set such that the load voltage is less than a value obtained by multiplying 70% of rated forward voltage of the light emitting elements by a number of the light emitting elements.