DISCHARGE LAMP OPERATION DEVICE AND BULB-SHAPED FLUORESCENT LAMP

摘要

By using a ceramic chip capacitor, it is possible to reduce the size of a discharge lamp operation device of a bulb-shaped fluorescent lamp. Even when the ceramic chip capacitor is short-circuited, it is possible to suppress excessive temperature increase. The ceramic chip capacitor is a capacitor (C5) for preheating and start contributing to the resonance of the discharge lamp device connected in parallel to a light emitting tube (4). The capacitor (C5) is located between wrapping pins (61, 61) and mounted on the surface of a substrate (58). An inverter circuit limits the current supplied to the ceramic chip capacitor to the normal current multiplied by 1.5 or below even when the capacitor (C5) is short-circuited, thereby preventing excessive temperature increase of the capacitor (C5).