Over-voltage protected solid-state ignition system

Details Over-voltage protected solid-state ignition system Over-voltage protected solid-state ignition system

1978-08-09

1981-07-21

Shaw, C. C.

Electricity: electrical systems and devices

Igniting systems

For electric spark ignition

123644, 315209T, F02P 1500

Patent

active

042801664

ABSTRACT:
To prevent excessive current flow through the control transistor of a solid-state ignition system in which the control transistor is serially connected with an ignition coil, if the power supply voltage should exceed rated value, the voltage monitoring circuit, including a Zener diode, is connected across the power supply source. The solid-state ignition system includes a control transistor which controls the conduction state of the final or output transistor. The over-voltage circuit additionally controls the conduction state of this control transistor to conductive condition if over-voltage is sensed, thereby causing changeover of the final or output transistor to blocked state. A timing circuit including a capacitor is preferably included in the monitoring circuit so that application of control voltage to the control transistor is gradual, causing changeover of the main or output transistor likewise to be gradual and preventing generation of an undesired ignition event.

REFERENCES:
patent: 3949722 (1976-04-01), Linstedt et al.
patent: 4020816 (1977-05-01), Chateau
patent: 4130101 (1978-12-01), Jundt et al.

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