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Static-error-free high-precision instrument temperature control circuit

A temperature control, high-precision technology, used in temperature control, non-electric variable control, control/regulation systems, etc., can solve problems such as low reliability of instrument temperature control circuits, eliminate static errors, reduce interference, and achieve high reliability. Effect

Active Publication Date: 2012-07-11
XIAN AEROSPACE PRECISION ELECTROMECHANICAL INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem of low reliability of the instrument temperature control circuit in the background technology, the present invention provides a high-precision instrument temperature control circuit without static error

Method used

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  • Static-error-free high-precision instrument temperature control circuit
  • Static-error-free high-precision instrument temperature control circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] See figure 1 , the details are as follows:

[0023] 1. The first thermistor 3R5 converts the heat signal into a variable resistance value.

[0024] 2. The heat signal is converted into a voltage signal through the bridge composed of 3R1, 3R2, 3R3, 3R4, 3R5, 3R7, and 3N1.

[0025] 3. The voltage signal goes through 3C5, 3R8, 3R10, 3C6, 3R12, 3R13, and 3N2 for differential, integral, and proportional operations, that is, PID operations. 3C5 performs differential processing on the input signal, and 3C6 performs integral processing on the input signal; 3R12 and 3R13 are output voltage dividing resistors;

[0026] 4. The calculated signal is compared with the frequency signal from 3N3 self-excited oscillation through 3N4 to generate a pulse width modulation signal.

[0027] 5. The pulse width modulation signal is isolated by 3N5.

[0028] 6. The isolated pulse width modulation signal drives the heating device through 3V3 and 3V4.

[0029] 7. The heat generated by the he...

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Abstract

The invention relates to a static-error-free high-precision instrument temperature control circuit. The temperature control circuit comprises a bridge circuit, a proportion integration differentiation (PID) operational circuit, a self-excited oscillation circuit, a comparison circuit, an isolation circuit, a heating unit and a monitoring circuit which are connected in turn. The technical problem that a digital PID controller cannot meet the requirement in the high-reliability fields of aerospace and the like is solved, analog PID control is adopted, a static error can be eliminated, and the controlled temperature of an instrument is basically not changed along with the change of ambient temperature.

Description

technical field [0001] The invention relates to an instrument temperature control circuit. Background technique [0002] Existing instrument temperature control circuits generally use digital PID controllers. However, in high-reliability fields such as aerospace, it is necessary to improve product reliability, and digital PID controllers cannot meet the requirements. Contents of the invention [0003] In order to solve the technical problem of low reliability of the instrument temperature control circuit in the background technology, the present invention provides a static-difference-free high-precision instrument temperature control circuit. [0004] Technical solution of the present invention is: [0005] A temperature control circuit for a high-precision instrument with no static difference, which is special in that: [0006] Including sequentially connected bridge circuit, PID operation circuit, self-excited oscillation circuit, comparison circuit, isolation circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/24
Inventor 陈开阳崔芳郭芳郭林肖
Owner XIAN AEROSPACE PRECISION ELECTROMECHANICAL INST
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