Thermal clamp for an ignition coil driver

Details Thermal clamp for an ignition coil driver Thermal clamp for an ignition coil driver

1990-04-30

1991-09-03

Pellinen, A. D.

Electricity: electrical systems and devices

Igniting systems

For electric spark ignition

361103, 123644, F02P 1100

Patent

active

050459643

ABSTRACT:
A circuit in an ignition system having a switchable current drive circuit responsive to a first control signal, and a charging circuit responsive to the switchable current drive circuit for providing a current through a coil to charge the coil when the switchable current drive circuit is enabled by the first control signal being in a first logic state and for collapsing the current through the coil thereby producing a rising voltage across the coil to fire a spark plug, typically coupled across the coil, when the switchable current drive circuit is disabled by the first control signal being in a second logic state. The circuit includes a thermal clamping circuit responsive to a second control signal and coupled to the charging circuit for providing current to the charging circuit to slowly discharge the coil and for clamping the voltage at the coil to a predetermined voltage such that the firing of the spark plug is prevented. The thermal clamping circuit is activated when the temperature of the ignition system exceeds a predetermined temperature.

REFERENCES:
patent: 4281358 (1981-07-01), Plouff et al.
patent: 4358812 (1982-11-01), LoCascio et al.
patent: 4359652 (1982-11-01), Jarrett et al.
patent: 4454560 (1984-06-01), Nakao et al.
patent: 4854292 (1989-08-01), Urushiwara et al.
patent: 4915072 (1990-04-01), Caron et al.
patent: 4947821 (1990-08-01), Somiya

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