Patent ID: 6831422
Filing Date: 2004-12-14
Classification: H02M,H03K,H05B,Y02B,Y10S

Abstract:
A circuit for operation of a loadhaving a switching transistor which is connected on one side to a supply potential and whose other side is the load side, and whose control connection can at least at times be driven outside the potential range between the supply potential and the potential on the load-side connection of the switching transistor, which circuit also has a driver circuit for driving the control connection, and an energy-storage capacitor for supplying the driver circuit with a supply power; the circuit comprising a pump circuit for charging the energy-storage capacitor from an alternating supply potential which is independent of the potential at the load-aide connection, with a series circuit, which connects the connections of the energy-storage capacitor, of two rectifier diodes connected in the same direction and with a potential isolation capacitor which is connected to a tap between the rectifier diodes on one side and the alternating supply potential on the other side.