TRANSISTOR DRIVING CIRCUITRY

摘要

The circuti arrangement for retaining a main transistor in a conductive state while receiving an external turn-on control signal and bringing the main transistor to a complete cut-off state in response to an external turn-off control signal includes a circuit provided on the primary side of a transformer for supplying a turn-on signal of turn-off signal to the main transistor in response to the turn-on or turn-off control signal. A constant current circuit maintains the transformer primary current constant so that the currents derived from the turn-on and turnoff signals are kept constant.