HIGH-VOLTAGE DISCHARGE LAMP LIGHTING DEVICE AND LIGHTING FIXTURE

摘要

A device includes a direct current power circuit 1 configured to convert an alternating current voltage from an alternating current power source AC into a direct current voltage, an output unit 2 configured to convert a direct current from the direct current power circuit 1 into a square wave alternating current whose polarity is inverted at a prescribed frequency and to supply the square wave alternating current to a high-pressure discharge lamp DL, a controller 3, and an anomaly detector 4 configured to detect an instantaneous voltage drop of the alternating current power source AC. When the anomaly detector 4 detects the instantaneous voltage drop, the controller 3 switches from a normal lighting mode of controlling the output unit 2 to supply the high-pressure discharge lamp DL with a square wave alternating current to a lighting maintained mode of controlling the output unit 2 to supply the high-pressure discharge lamp DL with a square wave alternating current having a lower frequency than the square wave alternating current in the normal lighting mode. In this way, it is possible to maintain lighting of the high-pressure discharge lamp DL even upon occurrence of an instantaneous power failure, an instantaneous voltage drop, and the like.