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1. (WO2018104017) ELECTRONIC CIRCUIT FOR DRIVING A THERMOCOUPLE ELEMENT, TEMPERATURE SENSING DEVICE AND METHOD FOR OBSERVING A LEAKAGE RESISTANCE OF THE THERMOCOUPLE ELEMENT

Pub. No.:    WO/2018/104017    International Application No.:    PCT/EP2017/079404
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Fri Nov 17 00:59:59 CET 2017
IPC: G01K 7/02
G01K 7/10
G01R 27/02
Applicants: CONTINENTAL AUTOMOTIVE GMBH
Inventors: SCOTTO, Pierre
Title: ELECTRONIC CIRCUIT FOR DRIVING A THERMOCOUPLE ELEMENT, TEMPERATURE SENSING DEVICE AND METHOD FOR OBSERVING A LEAKAGE RESISTANCE OF THE THERMOCOUPLE ELEMENT
Abstract:
Electronic circuit for driving a thermocouple element, temperature sensing device and method for observing a leakage resistance of the thermocouple element The invention is concerned with an electronic circuit (12) for driving a thermocouple element (11), comprising contact electrodes (15, 16) for connecting cold-end electrodes (14) of the thermocouple element (11) and a measuring circuitry (17) that is designed to measure a thermo-voltage (18') generated by the thermocouple element (11) between the contact electrodes (15, 6). The invention is characterized in that one of the contact electrodes (16) is connected to a supply voltage (V0) and to a ground potential(23) of the electronic circuit (12) over a voltage divider (19) having resistors (21, 22) with pre-defined resistance values such that a common mode voltage (20) between the contact electrode (16) and the ground potential (23) is in a pre-defined range, if a leakage resistance (33) that is effective between the contact electrode (16) and the ground potential (23) is greater than a pre-defined threshold.