An automatic temperature control circuit

Abstract

The invention relates to an automatic temperature control circuit, which is characterized in that it includes a thermistor, a Wien bridge oscillation circuit, a complementary symmetrical power amplifier circuit and a heating element, wherein the first end of the thermistor is grounded, and the second end of the thermistor terminal is connected with the input end of the Wien bridge oscillation circuit, the output end of the Wien bridge oscillation circuit is connected with the input end of the complementary symmetrical power amplifier circuit, the output end of the complementary symmetrical power amplifier circuit is connected with the first end of the heating element, and the first end of the heating element Both ends are grounded. Compared with the prior art, the present invention has the advantages of: the precise control of the temperature of the target heating element can be realized, and the error is relatively small, no special temperature control chip or single-chip microcomputer is required to participate in the control, the circuit form is simple, and the temperature parameter of the target heating element can be adjusted It is convenient, low in cost, can realize modularization, and has very good practical and economic significance in occasions where the temperature control accuracy is not high.

Description

technical field [0001] The invention relates to an automatic temperature control circuit. Background technique [0002] Temperature control is widely used in actual production and life, so that the temperature control circuit has become a hot research topic. At present, the temperature control circuit mainly consists of three parts: a temperature detection part, a control part and a heating device. In the traditional scheme, the control part is mainly completed by a single-chip microcomputer or a special temperature control chip. Using a dedicated temperature control chip is relatively expensive, and the device is biased. However, if a single-chip microcomputer is used to realize temperature control, if a single-chip microcomputer is specially arranged to realize temperature control, the cost is relatively high; if other parts of the system and temperature control occupy the same single-chip microcomputer, the temperature control circuit needs to occupy limited I / O hardware...

AI Technical Summary

Problems solved by technology

Use a dedicated temperature control chip, the price is relatively expensive, and the device is biased

However, if a single-chip microcomputer is used to realize temperature control, if a single-chip microcomputer is specially arranged to realize temperature control, the cost is relatively high; if other parts of the system and temperature control occupy the same single-chip microcomputer, the temperature control circuit needs to occupy limited I / O hardware resources and software resources, reducing the available resources of the entire system while increasing software complexity

Especially in some occasions that do not require too high precision, it is not suitable to use a single-chip microcomputer or a dedicated temperature control chip for temperature control, and the cost performance is not high.

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