Ignition coil energizing circuit

Details Ignition coil energizing circuit Ignition coil energizing circuit

1981-10-06

1983-09-06

Cox, Ronald B.

Internal-combustion engines

High tension ignition system

Safety device

123644, F02P 100

Patent

active

044022999

ABSTRACT:
An ignition coil energizing circuit is provided which has a signal generator for generating an output signal having a frequency corresponding to an engine rotational speed, a switching circuit connected to an ignition coil, a current detector for detecting a current flowing through the ignition coil, a duty control for supplying to the switching circuit a control signal having a duty cycle corresponding to a duty cycle of an output signal from the signal generator and controlling a conduction state of the switching circuit, and a current control circuit for controlling the switching circuit in response to an output signal generated from the current detector and maintaining a current flowing through the current detector at a predetermined value. The ignition coil energizing circuit also has a timer for generating an output signal when the switching circuit is detected to be on over a predetermined period of time and a current supply circuit for supplying a gradually increasing current to the current detector in response to an output signal of the timer.

REFERENCES:
patent: 4008698 (1977-02-01), Gartner
patent: 4167170 (1979-09-01), Sohner
patent: 4245610 (1981-01-01), Sugiura
patent: 4248200 (1981-02-01), Sugiura
patent: 4285323 (1981-08-01), Sugiura

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