Denso Corporation

Yukinobu Hiranaka

Noboru Yamamoto

Hiromi Hiramatsu

Yasutoshi Horii

Goichi Oda

Hiroaki Okuchi

Kenji Yoneima

Masamichi Ishikawa

Yuji Kajita

Yasushi Noyori

Tomoyuki Ichikawa

A hybrid IC of electronic circuit for a discharge lamp is disposed on the bottom of a metal case. A transformer, an inductor, a transformer, and a capacitor are disposed in a resin case. The resin case is contained in a metal case. 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 for a starter circuit has a secondary winding the inductance of which is 2.5 mH or larger, and a capacitance of a smoothing capacitor of a DC&mdash;DC converter is 0.5 &mgr;F or smaller. The switching frequency f of a MOS transistor is selected so that L2&times;C1 is equal to or larger than 1&times;10 &times;f .

High voltage discharge lamp apparatus for vehicles

Growing community of inventors

Shimizu, Japan

Yukinobu Hiranaka