| 摘要 |
Switching circuit comprises a switching transistor (26) having a base (28), an emitter (24) and a controller (34), a transformer (18) having a primary winding (20) and a secondary winding (22) one end (12) of which is coupled to the emitter and the other end (16) of which is coupled through a diode (30) to the collector. A resistor (36) is connected between the base and the emitter. The secondary winding (22) has a centre tap (14) connected to the base of the transistor. The diode (30) is arranged to conduct current into the collector and divert current available to the base emitter junction to prevent the collector base junction from being forward biased. |
