| 摘要 |
An improved proportional base drive circuit for rapidly and efficiently switching a high current bipolar load transistor comprises a transformer having first and second serially coupled primary windings, and first and second secondary windings coupled to the collector and to the base, respectively, of a high current load transistor for supplying the transistor with collector current and base current proportional to the collector current, respectively. A diverter circuit is coupled to the second secondary transformer winding and to the base and emitter of the load transistor. During intervals when the second transformer primary winding is effectively short circuited to initiate load transistor turn-off, the diverter circuit diverts current in the second secondary winding away from the load transistor base and also removes load transistor stored charge to effect rapid load transistor turn-off, thereby assuring reliable transistor switching.
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