| 摘要 |
A short-circuit-proof transistorized ignition output stage for motor vehicles, has a power transistor (10) connected in series to a primary winding (11) of an ignition coil (12), and a blocking arrangement including a first switching transistor for turning off the power transistor in the event of a very small voltage drop indicative of a short circuit in the coil (12). The voltage drop detector includes a second switching transistor (23') whose base-emitter path is connected across the primary winding (11) and whose collector-emitter path controls the base of a third switching transistor (25) of opposite conductivity type. The collector-emitter path of the third switching transistor (25) is connected in parallel to the base-emitter path of the first switching transistor (27) and the collector-emitter path of the first switching transistor is connected in parallel to the base-emitter path of the power transistor (10). Preferably, the entire output stage consists of a monolithic integrated circuit.
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