Patent ID: 6819058
Filing Date: 2004-11-16
Classification: H02M,H05B,Y02B,Y10S

Abstract:
A discharge-lamp lighting circuit comprising:a DC-DC converter circuit for converting input voltage from a DC power supply to a desired DC voltage; and a DC-AC converter circuit which is positioned at the rear stage of the DC-DC converter circuit and used for converting the DC voltage to AC voltage, the DC-AC converter circuit formed in accordance with a bridge type circuit arrangement including a plurality of switching elements, wherein the DC-AC converter includes a driving circuit using a plurality of bipolar transistors for controlling the on-off conditions of the switching elements positioned on the high voltage side of the switching elements forming a bridge; and the plurality of bipolar transistors are connected in series and the on-off conditions of the switching elements are controlled by the transistors positioned on the low voltage side.