Switch circuit arrangement for driving lamps

摘要

The circuit has two switches in a half-bridge arrangement. Each switch has a bipolar transistor (B2) and a field effect transistor (F2) with control, working and reference electrodes in a cascode circuit. The half bridge center point is coupled to the at least one load circuit. Each cascode circuit has an input stage (E2) with the series circuit of a diode (D21) and transformer secondary winding (L2) arranged parallel to the bipolar transistor's control electrode and the FET's reference electrode. The transformer primary (L 0) is in the load circuit to carry the load current (IL) when the lamp(s) is operating.