Protective circuit for the ignition system of an internal combus

Details Protective circuit for the ignition system of an internal combus Protective circuit for the ignition system of an internal combus

1976-09-21

1978-03-07

Cox, Ronald B.

Internal-combustion engines

Igniters

Incandescent

315209T, F02P 100

Patent

active

040773779

ABSTRACT:
To prevent a spurious inductive spark when the master ignition switch of the vehicle is opened with the breaker terminals closed, so that current stored in the ignition coil might cause a spurious inductive voltage pulse, a protective circuit branch is connected in parallel across the primary of the ignition coil and includes an auxiliary semiconductor short-circuiting switch, preferably a thyristor, the conduction of which is controlled to close by an auxiliary control circuit which senses opening of the master ignition switch and permits application of a portion of the inductive current flow to the gate of the thyristor to render it conductive, thus short-circuiting the primary of the ignition coil and preventing an inductive voltage kick which might cause a spurious spark.

REFERENCES:
patent: 3745985 (1973-07-01), Hohne
patent: 3854466 (1974-12-01), Steinberg

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