High voltage discharge lamp apparatus for vehicles

摘要

A hybrid IC (1000) of electronic circuit for a discharge lamp (2) is disposed on the bottom of a metal case (20). A transformer (41), an inductor (31), a transformer (71), and a capacitor (45) are disposed in a resin case (21). The resin case is contained in a metal case (20). In this instance, the transformer, the inductor, the transformer, and the capacitor are located outside the outer periphery of the IC so that the IC does not overlap on the transformer and other components. The transformer (71) for a starter circuit (7) has a secondary winding (71b) the inductance of which is 2.5 mH or larger, and a capacitance (C1) of a smoothing capacitor (44) of a DC-DC converter (4) is 0.5 mu F or smaller. The switching frequency f of a MOS transistor (43) is selected so that L2xC1 is equal to or larger than 1x10<-1>xf<-1.68>. <IMAGE>