Patent ID: 8766540
Filing Date: 2014-07-01
Classification: H05B

Abstract:
1. A lighting device comprising: a power conversion unit which converts a direct current (DC) power supplied from a DC power supply into a power required by a load; an output current detection unit which detects an output current of the power conversion unit; a source voltage detection unit which detects a source voltage of the DC power supply; an operation unit which, when calculating an output current command value of the power conversion unit based on a voltage value detected by the source voltage detection unit, calculates the output current command value so as not to exceed an upper limit of the output current command value set according to a resistance value of an externally connected resistor; and a control unit which controls the power conversion unit such that the output current of the power conversion unit detected by the output current detection unit becomes the output current command value calculated by the operation unit.