LOW DISSIPATION SNUBBER CIRCUIT FOR SWITCHING POWER TRANSISTORS

摘要

A low dissipation snubber for switching power transistors uses the energy stored in a snubber capacitor to provide all the base boost power required for switching the power transistors on. The snubber consists of a diode and a snubber capacitor connected in series between the collector and emitter of the switching transistors with a resistor connected at one end to the junction of the diode and the snubber capacitor. The other end of the resistor is connected to the base turn-on circuit for the switching power transistors so as to provide a discharge path for the snubber capacitor. By using the discharge of the snubber capacitor, power which is normally dissipated as heat is reclaimed so that the drive power requirements for the switching power transistors are reduced.