Patent ID: 6573674
Filing Date: 2003-06-03
Classification: H02H,H02M,H05B

Abstract:
A control circuit of an A.C. load, of the type including a bidirectional switch controllable by phase angle, in series with the load between two terminals of application of the A.C. supply, wherein it includes, in parallel with the switch, a first resistive element, a first capacitor and an element, in series with said first resistive element and said first capacitor, and operating, in steady state, like a constant current source, a midpoint of the series connection of the first resistive element and of the first capacitor being connected, via a bidirectional conduction element automatically turned on when the voltage thereacross exceeds a predetermined threshold, to a control terminal of the switch, wherein the element, in series with said first resistive element and the first capacitor comprises a rectifying bridge in a diagonal of which are associated, in parallel, a second capacitor and a second resistive element.