Engine ignition system having noise protection circuit

Details Engine ignition system having noise protection circuit Engine ignition system having noise protection circuit

2007-04-24

2007-04-24

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

High tension ignition system

Having specific trigger circuitry

C123S651000

Reexamination Certificate

active

11194477

ABSTRACT:
An ignition system for an internal combustion engine includes a switch circuit connected to an ignition coil to switch on or off current supplied to the ignition coil, a control circuit for providing a control signal for controlling the switch circuit based on the ignition signal and a protection circuit including an input terminal that receives the ignition signal, an NPN transistor having a collector connected to the input terminal, an emitter connected to a ground, a base and the collector and a parasitic diode between the collector and the emitter of the NPN transistor, in which a prescribed capacitance is formed between the base and the collector of the NPN transistor. If an electric surge that has an ascending slope comes into the input terminal, the NPN transistor to turn on to discharge the electric surge to a ground. If an electric surge that has an descending slope comes into the input terminal, it passes through the parasitic diode toward the input terminal.

REFERENCES:
patent: 3908622 (1975-09-01), Long
patent: 5483093 (1996-01-01), Murakami
patent: 5668384 (1997-09-01), Murakami
patent: 6614633 (2003-09-01), Kohno
patent: 6848437 (2005-02-01), Naruse et al.
patent: 2004/0000299 (2004-01-01), Naruse et al.

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