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High-precision temperature control circuit for thermoelectric cooler

A technology of thermoelectric refrigerator and temperature control, which is applied in the direction of temperature control using electric methods, machines using electric/magnetic effects, refrigerators, etc., which can solve the problems of low cooling efficiency, complex circuits, and low adjustment accuracy

Inactive Publication Date: 2003-11-05
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A high-power triode that requires a push-pull structure, its biggest advantage is low noise, but low cooling efficiency, and it is difficult to achieve high-precision temperature control
"High-precision Semiconductor Laser Diode Temperature Control System" (Luo Zhongsheng, Zhang Meidun, etc.; Semiconductor Optoelectronics 1999; (20) 2: 115-119) uses a linear drive method and uses an analog circuit to complete the temperature setting, which has the adjustment accuracy Not high, the whole circuit is complicated

Method used

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  • High-precision temperature control circuit for thermoelectric cooler
  • High-precision temperature control circuit for thermoelectric cooler
  • High-precision temperature control circuit for thermoelectric cooler

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0013] The present invention consists of five parts: temperature setting 1, temperature acquisition 2, PID (proportional integral differential) controller 3, PWM (pulse width modulation) power driver 4, and filter circuit 5.

[0014] The temperature setting part 1 completes the setting of the working temperature required by the core components of the system. In order to ensure temperature accuracy, a 12-bit D / A is controlled by μC (microcontroller) or PC in a digital way, so that the output of the D / A corresponds to the core components of the system (semiconductor laser, uncooled infrared focal plane, etc.) The working temperature to be achieved, the output of D / A is the temperature setting signal.

[0015] The temperature acquisition part 2 is composed of a temperature sensor and an excitation source. Common temperature sensors include th...

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Abstract

The high-precision temperature control circuit for thermoelectric cooler (TEC) includes five parts: temperature setter for setting TEC work temperature and outputting the set temperature to PID controller; temperature collector comprising temperature sensor and exciter for collecting practical TEC temperature and outputting the temperature signal to PID controller; PID controller the set TEC temperature and the practical TEC temperature and producing differential TEC control signal to the PWM power driver; and PWM power driver producing PWM signal according to the TEC control signal and filtering the signal to provide DC output to the TEC. The present invention has high-precision and low-cost temperature control circuit in PWM mode, and has temperature control precision of 5 mK.

Description

technical field [0001] The invention belongs to the field of electronic science and technology, and relates to a high-precision temperature control circuit for a thermoelectric refrigerator. Background technique [0002] A thermoelectric cooler is a small heat pump with no moving parts, used in a variety of applications for miniaturization and high reliability. Cooling or heating depends on the direction of the supplied current. A typical single-stage refrigerator is composed of two ceramic sheets of P-type and N-type semiconductor materials. The semiconductor materials are connected in series in the circuit and parallel in heat transfer. When a forward current acts on the N-type semiconductor, electrons flow from the P-type semiconductor to the N-type semiconductor, and because the heat is absorbed, the temperature of the cold end drops, and the heat is conducted to the hot end of the refrigerator and dissipated to the heat sink. and the surrounding environment. This hea...

Claims

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Application Information

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IPC IPC(8): F25B21/00G05D23/19
CPCY02B30/00Y02B30/70
Inventor 刘靖易新建何兆湘
Owner HUAZHONG UNIV OF SCI & TECH
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