Universal and output-adjustable thermistor linear compensation circuit based on audion

Abstract

A universal and output-adjustable thermistor linear compensation circuit based on an audion comprises a sensing adjustment module, a voltage constant module, a feedback amplification module, a linear compensation circuit and an output amplification module, wherein an output end of the sensing adjustment module is connected with the input end of the feedback amplification module, the output end of the feedback amplification module is connected with the input end of the output amplification module, the output end of the output amplification module is connected with a port 1 of the linear compensation module, an output port 2 of the linear compensation module is connected with the input end of the feedback amplification module, and the input end of the linear compensation module is connected with the output end of the voltage constant module. The universal and output-adjustable thermistor linear compensation circuit based on the audion has the advantages that the linear effect of the circuit is good, the circuit is simple in structure, the conversion flexibility of the circuit is high, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the combination of the field of photoelectric technology and the field of measurement and automatic control, and in particular relates to a universal and output-adjustable triode-based thermistor linear compensation circuit for temperature measurement of photovoltaic power generation system components. Background technique [0002] NTC (Negative Temperature Coefficient) thermistor has the advantages of large output signal, high sensitivity, small heat capacity, fast response, small size, low price, high resistance, etc., and is widely used in: optoelectronic technology fields (such as solar photovoltaic systems Temperature monitoring and measurement, semiconductor laser temperature monitoring and measurement, etc.); measurement and automatic control fields (such as: home air conditioners, car air conditioners, freezers, refrigerators, etc.); safety production monitoring fields (such as: fire monitoring, fire extinguishers, tempe...

AI Technical Summary

Problems solved by technology

The linearization effect of the bridge balance method is obvious, the circuit is simple, and the anti-interference ability is strong, but the measurement accuracy is not high, and it is usually used in occasions where the temperature measurement accuracy is not high.

The constant current and constant voltage methods can easily realize the conversion of resistance to voltage signals, but they need additional single-chip microcomputers and related software to solve their non-linear problems, which will increase the complexity of the circuit and also affect the constant voltage used. The stability of the current and constant voltage source puts forward strict requirements

In addition, the thermistor also has the disadvantage of poor consistency, which is mainly manifested in the same batch of thermistors manufactured under the same process conditions, the relationship between temperature and resistance will be different, which puts forward a high challenge to the general applicability of linear compensation circuits. Require

[0004] In short, the traditional NTC linearization method is either poor in linearization, or the circuit is complex and expensive, and cannot well overcome the shortcomings of poor consistency of thermistors

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