| 摘要 |
The invention concerns an electronic device, or dimmer, for regulating the power supply applied to a load (4), the device comprising an insulated gate bipolar transistor or IGBT (1), the IGBT (1) 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 (1) being connected to a rectifier bridge (2), apt to be connected to a load (4) and to a mains (5) connected in series to each other, the device further comprising a processing and controlling unit, the device being characterised in that said processing and controlling unit includes digital processing means (6, 7) and in that the device comprises ramp generating means (17, 18) driven by said processing and controlling unit, apt to generate a ramp voltage signal at an output terminal connected to the IGBT gate, so as to drive the IGBT (1) in linear region. The invention further concerns a system for controlling and regulating the power supply applied to a plurality of loads (4), comprising one of such dimmers for each one of the loads of said plurality.
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