Fault detection circuit of thermistor temperature measuring circuit
A technology of fault detection circuit and temperature measurement circuit, which is applied in the direction of electronic circuit testing, thermometers and thermometers using electric/magnetic components directly sensitive to heat, and can solve the problem of high price of A/D conversion chips and inability of disconnection detection process. Synchronization and other issues
Pending Publication Date: 2018-11-09
SHANGHAI SHIP & SHIPPING RES INST
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Problems solved by technology
[0004] At present, the number of A / D conversion chips with disconnection detection function on the market is relatively small: first, the price of such A / D conversion chips is relatively high; secondly, when such A / D conversion chips perform disconnection detection, they usually It is necessary to switch to a "disconnection detection mode", and then switch back to the "normal A / D sampling mode" after the disconnection detection is completed, that is, the normal A / D sampling process and the disconnection detection process cannot be carried out synchronously
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[0015] Such as figure 1 as well as figure 2 As shown, a fault detection circuit of a thermistor temperature measurement circuit includes a detection resistor R DETECT , A / D converter 110 and a processing unit.
[0016] Sense resistor R DETECT Connected in series to the return line 21 of the constant current source thermistor temperature measuring circuit 20, by judging the detection resistor R DETECT The voltage value of V DETECT , which can realize the fault (thermistor open circuit fault or line open circuit fault) detection function running synchronously with the temperature measurement function of the thermistor.
[0017] It should be pointed out that the constant current source thermistor temperature measuring circuit 20 is a two-wire system, a three-wire system or a four-wire system.
[0018] The two-wire constant current source thermistor temperature measuring circuit 20 has a return line 21 and a going line 22, such as figure 1 As shown, the three-wire constant ...
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The invention provides a fault detection circuit of a thermistor temperature measuring circuit. The fault detection circuit comprises a detection resistor, an A / D converter and a processing unit. Thedetection resistor is connected in series on the return line of the constant current source thermistor temperature measuring circuit. The A / D converter is connected with the two ends of the detectionresistor. The processing unit is connected with the A / D converter. The A / D converter independent of the A / D conversion chip of the thermistor temperature measuring circuit is applied to perform faultdetection, and the temperature measurement function and the fault detection function can be synchronously performed without mutual influence.
Description
technical field [0001] The invention belongs to the technical field of thermistor temperature measurement, in particular to a fault detection circuit of thermistor temperature measurement circuit. Background technique [0002] At present, the thermistor temperature measurement circuit is usually realized by the principle of constant current source or the principle of unbalanced bridge. The thermal resistance temperature measurement circuit using the principle of constant current source has the advantages of low temperature drift and flexible interface. It can realize the temperature measuring circuit of two-wire, three-wire and four-wire thermistor. The principle of constant current source is relatively easy to realize a higher precision thermistor temperature measuring circuit. [0003] With the continuous development of measurement and control technology, the system-level design puts forward higher requirements for the thermistor measurement circuit, not only the accuracy ...
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IPC IPC(8): G01K7/22G01R31/28
CPCG01K7/22G01R31/28
Inventor 冯宁华金马帅王梦迪谢木森
Owner SHANGHAI SHIP & SHIPPING RES INST