Patent ID: 8072147
Filing Date: 2011-12-06
Classification: H01L,H05B,Y02B

Abstract:
1. A lighting and/or signalling device for a motor vehicle comprising at least one light source and an electronic supply and control means for controlling power supplied to said at least one light source, wherein said electronic supply and control means comprises at least one circuit comprising at least one stack of chips formed from at least two power components, wherein said at least one circuit comprises a substrate of high temperature printed circuit type, capton type, ceramic type or lead frame type; wherein said at least one circuit is included in at least one of an electronic ballast or an electronic module, said at least two power components comprising at least one first transistor stacked on at least one second transistor; said at least one first transistor being stacked directly on top of said at least one second transistor and facilitating heat removal and an electrical connection between said at least one first transistor and said at least one second transistor and also facilitates heat removal; said at least one first transistor only partially covering said at least one second transistor to provide a visible upper face on said at least one second transistor that is not covered by said at least one first transistor; said lighting and/or signalling device further comprising at least one thermal heat sink located in a region of said at least one first transistor and said at least one second transistor to facilitate removal of heat therefrom; and wherein said at least one first transistor and said at least one second transistor define said at least one stack of chips and each of them provide power to said at least one light source.