Patent ID: 8085519
Filing Date: 2011-12-27
Classification: H02H,H02M,H05B

Abstract:
1. A circuit arrangement for providing a DC operating voltage from a mains voltage with a first mains input (J a clocked converter circuit (L a storage capacitor (C an evaluation circuit (DET, DRV), which evaluates the voltage between the mains inputs (J the switching arrangement being characterized in that it has a dissipating switch (Th) with a first working terminal, a second working terminal and a control terminal, the first working terminal of the dissipating switch (Th) being coupled to the second working terminal of the switching transistor (S wherein a storage inductor (L wherein the dissipating switch (Th) comprises a thyristor (Th), and the evaluation circuit comprises a driver circuit (DRV), which provides the control signal at the gate of the thyristor (Th), the driver circuit (DRV) being designed in such a way that the control signal is negative with respect to the cathode of the thyristor (Th) in the time in which the driver circuit (DRV) is not triggering the thyristor.