Patent ID: 7541748
Filing Date: 2009-06-02
Classification: H05B

Abstract:
1. A discharge lamp lighting device, comprising: a power control circuit which controls a power to drive a discharge lamp; a voltage detector which detects an output voltage of the power control circuit; a current detector which detects a current supplied to the discharge lamp; a bi-directional communication unit which communicates an exterior of the discharge lamp lighting device via a bi-directional communication; and a processing circuit which controls the power control circuit in accordance with a detection result of the voltage detector, a detection result of the current detector and a required command received by the bi-directional communication, wherein the processing circuit changes a driving status of the power control circuit from a stationary driving state driven in a normal power to a low power driving state over 0.5 seconds, the low power driving state in which the power being lower than a power in the stationary driving state and through which the driving status of the power control circuit moves from the stationary driving state to a turn-off state.