| 摘要 |
A protection circuit for a power transistor cuts off the transistor if an overcurrent condition occurs. The protection circuit includes control transistors that are switched on and off to alternately supply positive voltage to the base of the power transistor to turn it on and negative voltage to turn it off. A control circuit provides signals to the control transistors to turn them on and off. A latch has an input connected across the collector and emitter of the power transistor for monitoring the voltage. If the voltage exceeds a threshold level at the latch, the latch will provide a disabling output to the control circuit to turn off the power transistor. |
