Circuit for a detecting state of conduction of current through a

Details Circuit for a detecting state of conduction of current through a Circuit for a detecting state of conduction of current through a

1992-07-16

1994-09-06

Snow, Walter E.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324418, 340644, G01R 3106, G01R 3102

Patent

active

053451813

ABSTRACT:
A circuit is provided for detecting abnormal conduction of current conducted through a solenoid in response to the pulse width modulation signal. The circuit includes a measuring means, for detecting conduction current conducted through the solenoid in response to the pulse width modulation signal and measuring continuous conduction time of the conduction current, and determining means, for determining a conduction to be an abnormal conduction when the continuous conduction time is longer than a predetermined time. Thus, the circuit can be miniaturized and the accuracy of the circuit is not affected by the accuracy of its components. And, the circuit is capable of detecting the half short state of the transistor driving the solenoid and not malfunctioning even if tile power is turned off.

REFERENCES:
patent: 4746869 (1988-05-01), Schrag et al.
patent: 5065101 (1991-11-01), Ledbetter

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