Patent ID: 6127788
Filing Date: 2000-10-03
Classification: H02H,H05B,Y02B,Y10S

Abstract:
A discharge lamp device comprising:a discharge lamp;a direct current power source;a starting circuit having a capacitor charged by power supplied from the direct current power source and switching means for controlling charge and discharge of the capacitor and applying a high voltage to the discharge lamp by discharging the capacitor to start turn on of the discharge lamp;a transformer for transforming a voltage of the direct current power source into a high voltage; andan inverter circuit for inverting the high voltage into alternating current, the inverter circuit being connected to a secondary side of the transformer and including an H-bridge circuit for inverting discharge voltage polarity of the discharge lamp by a plurality of switching means arranged in an H-bridge configuration; and whereinthe starting circuit is connected to an intermediate potential point of the H-bridge circuit;the discharge lamp is turned on by applying the alternating current to the discharge lamp after it has started to turn on, andthe switching element includes a semiconductor switching means.