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Improved thermoelectric cooler control method

A technology of thermoelectric cooler and control method, which is applied in the field of optical communication, can solve problems such as overshoot and achieve the effect of reducing overshoot phenomenon

Active Publication Date: 2015-05-27
WUHAN TELECOMM DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide an improved thermoelectric cooler control method to solve the problem of overshoot in the prior art

Method used

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  • Improved thermoelectric cooler control method

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Experimental program
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Embodiment 1

[0020] figure 1 Shown is a schematic structural diagram of a device suitable for an improved control method of a thermoelectric cooler provided by an embodiment of the present invention, and is specifically a schematic diagram of the working circuit of an EML laser. The device includes a light emitting submodule 1 (ie, a laser), Microcontroller 2, temperature sensor 3 and thermoelectric cooler driving device 4, specifically:

[0021] The thermoelectric cooler TEC is usually integrated in the optical emission sub-module 1, and encapsulates two pins TEC+ and TEC-. The TEC driver chip 4 provides current to the loop of TEC+ and TEC- to control the temperature. The greater the current, the control The more obvious the effect. TEC positive control current (that is, current flowing from TEC+ to TEC-) will produce a cooling effect, and reverse control current (that is, current flowing from TEC- to TEC+) will produce a heating effect. The thermistor inside the EML device forms the tempe...

Embodiment 2

[0040] Such as image 3 Shown is a flowchart of an improved thermoelectric cooler control method provided by the present invention, which can be based on figure 1 The device shown is implemented, but the method flow of the present invention is not limited to figure 1 In the device shown, the method of the present invention includes the following steps:

[0041] In step 101, the temperature sensor 3 detects the temperature value M of the light emitting sub-module 1 and sends the detected temperature value M to the microcontroller 2.

[0042] In step 102, the microcontroller 2 compares the received temperature value M with a preset target value R.

[0043] In step 103, the comparison result is used as the calculation factor of the PI temperature control algorithm, and the calculation result will be transmitted by the microcontroller 2 to the thermoelectric cooler TEC4.

[0044] In step 104, the thermoelectric cooler TEC4 generates a TEC forward control current or a TEC reverse control ...

Embodiment 3

[0049] This embodiment focuses on the PI temperature control calculation method to explain how to implement the present invention. In each embodiment of the present invention, when the value of Pout reaches the saturation zone, the method of not accumulating the integral term is used to avoid the module being powered on at extreme temperatures. Overshoot may occur at the time. The method of not accumulating the integral term is specifically implemented in the second embodiment as suspending PI temperature control.

[0050] This embodiment takes power-on in a high-temperature environment as an example to illustrate that in combination with this embodiment, the improved PI temperature algorithm implementation method assumes that TEC_Max is the maximum value that the preset control current Pout can output, which is also called saturation current value. Such as Figure 5 As shown, the specific implementation is:

[0051] In the TEC control process, if the current calculation result P...

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Abstract

The invention is applicable to the field of optical communication and provides an improved thermoelectric cooler control method. The improved thermoelectric cooler control method comprises the following steps: a temperature sensor detects and sends a temperature value M of a light-emitting sub-module to a MCU (Microprogrammed Control Unit); the MCU compares the received temperature value M with a preset target value R, comparison results are taken as calculation factors of a PI temperature control algorithm, and calculation results are transferred to a TEC (Thermoelectric Cooler) through the MCU, so that a TEC forward control current or a TEC reverse control current is generated; when the MCU determines that the calculation results reach the maximum control current generated by the TEC, PI temperature control is temporarily stopped, and the maximum control current is directly outputted; when reverse values occur in the comparison results of the temperature value M and the preset target value, the PI temperature control is started, and the control current is outputted according to the PI temperature control calculation result. According to the improved thermoelectric cooler control method, not only is the overshoot phenomenon generated by TEC control under extreme temperature effectively reduced, but also the working efficiency of the MCU can be improved through reducing the PI temperature control.

Description

Technical field [0001] The invention belongs to the field of optical communication, and particularly relates to an improved control method of a thermoelectric cooler. Background technique [0002] In the high-speed, long-distance optical communication application field, an electroabsorption modulated laser (Eroabsorption Modulated Laser, abbreviated as: EML) with high temperature stability is usually used. The output wavelength, current threshold, maximum output power and minimum power fluctuations of EML lasers are all directly affected by the operating temperature. Therefore, for optical modules using electro-absorption modulated lasers, the accuracy and reliability of temperature control are particularly important. Usually a small and easy-to-control thermoelectric cooler (Thermo Electric Cooler, abbreviated as: TEC) is used as the cooling and heating device, and a high-precision negative temperature coefficient thermistor (Negative Temperature Coefficient, abbreviated as: NT...

Claims

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Application Information

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IPC IPC(8): G05D23/24
Inventor 尤虎陈龙田军
Owner WUHAN TELECOMM DEVICES