Patent ID: 6831426
Filing Date: 2004-12-14
Classification: H02M,H05B,Y02B,Y10S

Abstract:
Electronic device, or dimmer, for regulating the power supply applied to a load, the device comprising an insulated gate bipolar transistor or IGBT, the IGBT having a first operating mode in which it is off and does not allow any current to pass, a second operating mode in which it is on and the current passing therein is substantially limited by characteristics of an external circuit connected to it, and a third linear region operating mode, in which the current passing therein is limited by a value proportional to the gate voltage, the IGBT being connected to a rectifier bridge, apt to be connected to a load and to a mains connected in series to each other, the device further comprising a digital processing means and ramp generating means driven by said digital processing means, apt to generate a ramp voltage signal at an output terminal connected to the IGBT gate, so as to drive the IGBT in linear region.