Two wire detection system for producing abnormal state outputs

Details Two wire detection system for producing abnormal state outputs Two wire detection system for producing abnormal state outputs

1991-01-22

1992-08-25

Harvey, Jack B.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324538, 324555, 340664, G01R 3102

Patent

active

051422352

ABSTRACT:
The detection system comprises a sensor and a controller which are connected by two wires. The sensor can take more than two states as opposed to conventional detection systems. According to this arrangement, for instance, a small leakage current exists even when the sensor is in normal off state, and, therefore, electric current in the range of I1 to I2 flows even in normal off state. On the other hand, electric current of I3 to I4 flows in normal on state. When there is a wire breakage, no electric current flows. Conversely, when there is a shortcircuiting, electric current exceeding I4 flows. Electric current in the range of I3 to I4 corresponds to an unstable state which is neither normal on state nor normal off state. Thus, by distinguishing the level of the electric current flowing through the wires, by using suitable electric current level detecting circuit, which of the level classes it belongs to, a state signal corresponding to the result of this distinguishing process can be outputted for self-diagnosing purpose.

REFERENCES:
patent: 3829850 (1974-08-01), Guetorsloh
patent: 3931571 (1976-01-01), Hocking et al.
patent: 4068189 (1978-01-01), Wilson
patent: 4433309 (1984-02-01), Hermle et al.
patent: 4446427 (1984-05-01), Lovrenich

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