Short-circuit-proof transistor output stage, especially ignition

Details Short-circuit-proof transistor output stage, especially ignition Short-circuit-proof transistor output stage, especially ignition

1994-07-11

1996-09-24

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 54, H02H 300

Patent

active

055596614

ABSTRACT:
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.

REFERENCES:
patent: 4477747 (1984-10-01), Wakai et al.

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