Disconnection detecting circuit for sensor apparatus

Details Disconnection detecting circuit for sensor apparatus Disconnection detecting circuit for sensor apparatus

2006-06-06

2006-06-06

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S609000

Reexamination Certificate

active

07057396

ABSTRACT:
In a disconnection detecting circuit comprising a control circuit and a sensor circuit, an energizing current is supplied from the control circuit side through an output terminal to the sensor circuit side by energizing a transistor in the sensor circuit side directly in a state where a pull-up resistor or a pull-down resistor having a several kΩ to several tens kΩ is provided in the control circuit side. In addition, a current control circuit, a constant-current circuit, a bias circuit and a transistor unit are provided in the sensor circuit side so that, at the occurrence of a disconnection of a power supply line, the impedance of the sensor circuit side is set to be higher by at least one-digit than the resistance value of the pull-up resistor in the control circuit side. This enables detecting a disconnection of connection lines between circuits while preventing an increase in contact resistance of terminal contacts to the utmost.

REFERENCES:
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patent: 6449207 (2002-09-01), Sher et al.
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patent: 5-107292 (1993-04-01), None
patent: 8-146069 (1996-06-01), None

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