Automotive ignition system with sparkless thermal overload...

Details Automotive ignition system with sparkless thermal overload... Automotive ignition system with sparkless thermal overload...

2005-10-18

2005-10-18

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

High tension ignition system

Safety device

C123S644000

Reexamination Certificate

active

06955164

ABSTRACT:
An interface for providing thermal overload protection includes a switching device, a temperature indicating device, a drive circuit and a thermal monitoring circuit. The thermal monitoring circuit is coupled across the temperature indicating device and provides a shutdown signal to the drive circuit when the temperature of the switching device is above a predetermined temperature level as indicated by a temperature signal provided by the temperature indicating device. The drive circuit responds to the shutdown signal by removing current sources and current sinks from a control terminal of the switching device at which point leakage currents cause the switching device to reduce a drive current to an inductive load.

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