Circuit for operating a driving circuit with improved power supply

摘要

The circuit has a transistor (T1), and a capacitor to supply a driver circuit with a supply power. A pump circuit charges the capacitor from an alternating supply potential with a series circuit. The series circuit connects the capacitor connections of two rectifier diodes in same direction and with an isolation capacitor. The isolation capacitor is connected to a tap between the diodes and the supply potential. The transistor is connected between a supply potential and a load, and the driver circuit drives a control connection.