Pt100 temperature sensor-based novel high-precision temperature measurement circuit

Abstract

A Pt100 temperature sensor-based novel high-precision temperature measurement circuit of the present invention is characterized in that two constant current sources are designed at the two ends of a Pt100 temperature sensor, so that the current of the circuit is constant, and the circuit is not interfered by the current fluctuation in the circuit easily. Then a two-stage amplification circuit is designed to amplify a signal acquired by the Pt100 temperature sensor, and a constant voltage source is added in each stage of amplification circuit to provide a stable reference voltage to the circuit. The Pt100 temperature sensor-based novel high-precision temperature measurement circuit of the present invention is high in temperature measurement accuracy and stable and reliable in system operation, and enables the performance temperature and the error to satisfy the actual requirements. The Pt100 temperature sensor-based novel high-precision temperature measurement circuit comprises two constant current source modules, the Pt100 temperature sensor, the two-stage amplification circuit, a main control chip, a JTAG downloading module and a display module, and the structural key points of the circuit are that the output of the two constant current source modules is connected with the input of the Pt100 temperature sensor, the output of the Pt100 temperature sensor is connected with the two-stage amplification circuit, the output of the two-stage amplification circuit is connected with one input end of the main control chip, the other input end of the main control chip is connected with the JTAG module, and one output end of the main control chip is connected with the display module.

Description

Technical field [0001] The invention is applied in many fields such as industry and agriculture, national defense, aerospace and scientific research, and specifically relates to a new high-precision temperature measuring circuit based on Pt100. Background technique [0002] In many fields such as industry and agriculture, national defense, aerospace and scientific research, temperature measurement has always played a pivotal role. Traditional temperature measuring instruments have slow response, low accuracy, poor reliability, and low efficiency, and can no longer meet the needs of modern industries. With the development of sensor technology and electronic measurement technology, temperature measurement systems based on single-chip microcomputers have been widely used in all aspects of life. [0003] Pt100 is made of a very thin platinum wire wound on a mica support. It is an internationally recognized high-precision temperature measurement standard sensor. Because platinum resis...

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Problems solved by technology

[0004] However, the current Pt100 temperature sensor has low measurement efficiency in many temperature measurement circuit designs. In order to im

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