A thermoelectric material resistivity measurement circuit

Abstract

The invention discloses a thermoelectric material resistivity measurement circuit, which comprises a core control module, an instruction input module, a voltage acquisition module, a current reversing module, a reference voltage output module, a reference voltage module, a current series-connection negative feedback module, a gear-selecting module, a display module, an automatic measurement module and a resistivity calculating module. After obtaining an operation instruction, a system operates the current direction according to the current reversing judgment result, and outputs a set reference voltage; stage constant current of the current is realized through the current series-connection negative feedback module; the gear-selecting module is used for adjusting the magnitude of the constant current; and finally, the voltage value is collected through the voltage acquisition module, used for the calculation of resistivity and displayed on the display module. The invention provides the measurement circuit, which is small in size, low in power consumption, safe and stable and high in precision, for the measurement of thermoelectric material resistivity; large-range resistivity measurement can be realized; and meanwhile, influence of Seebeck and Peltier effects on thermoelectric material resistivity measurement can be reduced.

Description

technical field [0001] The invention relates to the fields of measurement technology, electronic circuit technology and thermoelectric material performance testing, in particular to a thermoelectric material resistivity measurement circuit. Background technique [0002] Improving the thermoelectric conversion efficiency is a key issue in the research of thermoelectric materials, and the thermoelectric conversion efficiency of thermoelectric materials is obtained from the combination of thermal conductivity, resistivity and Seebeck coefficient, so the accurate measurement of resistivity directly affects the measurement of the performance of thermoelectric materials , which in turn affects the research of thermoelectric materials. The resistivity of thermoelectric materials is very sensitive to temperature, and its change with temperature is nonlinear, and its resistivity varies greatly with temperature, even up to six orders of magnitude. The change of wide range has a great ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of insufficient measurement accuracy of the resistivity of thermoelectric materials, the present invention provides a circuit for measuring the resistivity of thermoelectric materials, which can realize the measurement of resistivity in a wide range, and reduce the influence of Seebeck and Peltier effects on the measurement of thermoelectric materials. Features High Accuracy, Low Power Consumption, and Stable Measurement

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