A PHASE CUTTING CONTROL DIMMER ARRANGEMENT WITH SURGE VOLTAGE AND ELECTRICAL FAST TRANSIENT PROTECTION

摘要

A phase cutting control dimmer arrangement with a surge voltage and electrical fast transient (EFT) protection including a load control arrangement having back- to-back field effect transistors (FETs) or insulated gate bipolar transistors (IGBTs) with connected gates. A primary EFT shunt capacitor valued to provide high impedance at AC mains supply frequency so as to provide a minimal current through the active terminal and the load terminal when the dimmer arrangement is "off" and a surge voltage gate drive arrangement adapted to turn "on" the back- to-back field FETs or IGBTs with connected gates in response to a surge voltage event.