CN101776929B - Temperature control method and device of laser with thermoelectric refrigerating unit - Google Patents
Temperature control method and device of laser with thermoelectric refrigerating unit Download PDFInfo
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- CN101776929B CN101776929B CN 201010001203 CN201010001203A CN101776929B CN 101776929 B CN101776929 B CN 101776929B CN 201010001203 CN201010001203 CN 201010001203 CN 201010001203 A CN201010001203 A CN 201010001203A CN 101776929 B CN101776929 B CN 101776929B
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Abstract
The invention discloses temperature control method and device of a laser with a thermoelectric refrigerating unit. The temperature control device comprises a thermister, a thermoelectric refrigerating unit TEC, a temperature sensor and a thermoelectric refrigerating unit TEC control part, wherein the thermister detects the tube core temperature of the laser inside a laser assembly shell and outputs a tube core temperature detection signal; the thermoelectric refrigerating unit TEC controls the tube core temperature of the laser; the temperature sensor detects the temperature of the laser assembly shell and outputs a shell temperature detection signal; and the TEC control part corrects a set value of the tube core temperature of the laser by utilizing the shell temperature detection signal output by the temperature sensor, compares the value of the tube core temperature detection signal output by the thermister with the corrected set value of the tube core temperature of the laser and controls the amount and the direction of the current of the thermoelectric refrigerating unit TEC according to the comparison result. The invention corrects the set value of the tube core temperature of the laser by temperature of the laser assembly shell, which is detected by the temperature sensor, thereby compensating the control precision error caused by thermal resistance between the thermister and the tube core of the laser.
Description
Technical field
The present invention relates to temperature-controlled process and the device of laser instrument, particularly have the method and apparatus of the laser temperature control of thermoelectric refrigerating unit.
Background technology
Determine the performance of optical transmission system to a great extent as the optical module of critical component in the optical transmission system.Optical module outputs to optical fiber to light signal with electric signal through electric light conversion back, receives the light signal that far-end transmits simultaneously, converts light signal to electric signal, realizes that light signal sends and receives.In optical transmission system, the electric light converted laser there is the requirement of luminous power stability.In dwdm system, the operation wavelength of laser instrument will satisfy also that G.692 ITU-T stipulate is applicable to that the smallest passage of optical fiber G.652/G.655 is spaced apart the specific wavelength requirement of 50GHZ or 100GHz, and luminous power is all relevant with the die temperature of laser instrument with emission wavelength.Each laser instrument producer all in its laser instrument integrated thermoelectric refrigerating unit (TEC) for this reason.Flow through the size of current of TEC and the die temperature that direction just can be controlled laser instrument by control, thus the luminous power of stable laser and wavelength.The scheme that generally adopts is integrated TEC and thermistor in laser assembly at present, come the die temperature of detection laser by the resistance that detects thermistor, adopt degenerative method to control the size and Orientation that flows through the TEC electric current, the die temperature of stable laser.But there are two problems in this scheme: owing between thermistor and the laser tube core thermal resistance is arranged, so the resistance of thermistor can not be reacted the die temperature of laser instrument fully accurately, bring error to control so 1..Particularly variation of ambient temperature the time, this error is especially obvious.When environment temperature when higher, just need very big TEC working current for the die temperature that makes laser instrument is stabilized in lower fixed value, produce very big heat.If the radiating treatment of laser assembly is improper, these heats can not in time distribute die temperature is further raise.So just form positive feedback, caused laser heat to damage.
Summary of the invention
The purpose of this invention is to provide a kind of device that has the laser temperature control of thermoelectric refrigerating unit, be used for compensation because the error of the control accuracy that the thermal resistance between thermistor and the laser tube core causes.
In addition, another object of the present invention provides a kind of method that has the laser temperature control of thermoelectric refrigerating unit.
According to first aspect present invention, the temperature control equipment that has the laser instrument of thermoelectric refrigerating unit comprises:
Thermistor, for detection of the die temperature of the laser instrument in the laser assembly housing, and output tube core temperature detection signal;
Thermoelectric refrigerating unit TEC is for the die temperature of control laser instrument;
Temperature sensor, for detection of the case temperature of laser assembly housing, and the output housing temperature detection signal; And
The TEC control section, be used for utilizing the case temperature detection signal correction laser tube core desired temperature of described temperature sensor output, the value of the die temperature detection signal of described thermistor output and laser tube core desired temperature through revising are compared, and size of current and the direction of TEC are flow through in control according to comparative result.
In one embodiment of the invention, described TEC control section comprises:
Temperature acquisition and signal conditioning circuit, after being used for value with the case temperature detection signal of described temperature sensor output and comparing processing with described laser tube core desired temperature, obtain and export as the signal through the laser tube core desired temperature of correction;
Error-detector circuit after being used for value with the die temperature detection signal of described thermistor output and comparing processing with described laser tube core desired temperature through revising, obtains also output error detection signal;
Temperature controller is used for obtaining and export the control signal of control TEC by calculating described error detection signal;
The thermoelectric refrigerating unit driving circuit is used under the control of described control signal, and the driving signal of described thermoelectric refrigerating unit TEC is flow through in output, and wherein said driving signal is the electric current that changes size and Orientation according to described control signal.
Wherein said thermoelectric refrigerating unit control device also comprises the margining detecting circuit of moving into one's husband's household upon marriage for detection of the case temperature maximum permissible value, when detecting case temperature from the signal representative of described temperature acquisition and signal conditioning circuit greater than the case temperature maximum permissible value, be used for turn-offing the enable signal in TEC loop to the output of TEC driving circuit.
Wherein said temperature sensor is the negative tempperature coefficient thermistor that is attached on the laser assembly housing.
Wherein said temperature acquisition and signal conditioning circuit are comparator circuit, and its forward end receives the case temperature detection signal of temperature sensor output, and its backward end receives the signal as the laser tube core desired temperature.
Wherein said error-detector circuit is comparator circuit, and its forward end receives the signal from the laser tube core desired temperature through revising of temperature acquisition and signal conditioning circuit, and its backward end receives the die temperature detection signal of described thermistor output.
In another embodiment of the present invention, described TEC control section comprises:
Case temperature detection signal and thermistor output tube core temperature detection signal to temperature sensor output carries out analog-to-digital analog to digital converter respectively;
Digital signal to analog to digital converter output compares processing, with the control signal of exporting control TEC respectively and the processor that turn-offs the enable signal in TEC loop;
Digital controlled signal to processor output carries out digital-to-analog conversion, with the digital to analog converter of output analog control signal; And
According to the analog control signal of described digital to analog converter output and the enable signal of processor output, carry out the control of TEC size of current and direction and TEC and turn-off the TEC driving circuit of control.
According to a second aspect of the invention, the temperature-controlled process that has the laser instrument of thermoelectric refrigerating unit of the present invention comprises:
Utilize the die temperature of the laser instrument in the thermistor detection laser assembly housing, obtain and export the tube core temperature detection signal;
Utilize the case temperature of temperature sensor detection laser assembly housing, obtain and the output housing temperature detection signal; And
According to described die temperature detection signal and case temperature detection signal, size of current and the direction of thermoelectric refrigerating unit TEC flow through in control, comprising:
Utilize the described laser tube core desired temperature of case temperature detection signal correction of described temperature sensor output;
The value of the die temperature detection signal of described thermistor output and laser tube core desired temperature through revising are compared;
According to described comparative result, size of current and the direction of thermoelectric refrigerating unit TEC flow through in control, controls the die temperature of described laser instrument thus.
Wherein, compare by value and laser tube core desired temperature with the case temperature detection signal of described temperature sensor output, obtain described laser tube core desired temperature through correction.
Method of the present invention also comprises and detects the case temperature maximum permissible value, during greater than described case temperature maximum permissible value, turn-offs the step in thermoelectric refrigerating unit loop with convenient case temperature.
Because the present invention utilizes the case temperature of the laser assembly housing of temperature sensor detection to revise the laser tube core desired temperature, make laser tube core desired temperature and the die temperature value of the laser instrument of thermistor detection through revising difference reflects laser instrument actual die temperature and setting value poor, thereby compensated the error of the control accuracy that the thermal resistance between thermistor and the laser tube core causes.
The present invention is described in detail below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the synoptic diagram that shows laser assembly structure of the present invention and temperature sensor location relation;
Fig. 2 is the theory diagram of first embodiment of TEC control section of the present invention;
Fig. 3 is temperature acquisition among first embodiment and the electrical schematic diagram of signal conditioning circuit;
Fig. 4 is temperature acquisition among first embodiment and the electrical schematic diagram of signal conditioning circuit, error-detector circuit, temperature controller, TEC driving circuit and mutual relationship thereof;
Fig. 5 is temperature acquisition and the signal conditioning circuit among first embodiment, the electrical schematic diagram of move into one's husband's household upon marriage margining detecting circuit and TEC driving circuit and mutual relationship thereof;
Fig. 6 is the electrical schematic diagram of second embodiment of TEC control section of the present invention;
Fig. 7 is the software flow pattern that is applicable to second embodiment of the invention.
Embodiment
Fig. 1 has shown laser assembly structure and the temperature sensor location relation that has thermoelectric refrigerating unit of the present invention, and as shown in Figure 1, the temperature control equipment that has the laser instrument of thermoelectric refrigerating unit of the present invention comprises:
Be arranged on the thermistor 2 in the laser assembly housing 1, for detection of the die temperature of the laser instrument 6 in the laser assembly housing 1, output tube core temperature detection signal;
Be arranged on the thermoelectric refrigerating unit TEC 3 in the laser assembly housing 1, be used for the die temperature of control laser instrument, namely flow through the size and Orientation of the electric current of TEC 3 by change, change the temperature of TEC 3, thus the die temperature of control laser instrument;
TEC control section (not showing among Fig. 1), be used for utilizing the case temperature detection signal correction laser tube core desired temperature of described temperature sensor 4 outputs, the value of the die temperature detection signal of described thermistor 2 outputs and laser tube core desired temperature through revising are compared, and size of current and the direction of TEC3 are flow through in control according to comparative result.
One of characteristics of the present invention are, utilize the case temperature detection signal correction laser tube core desired temperature of described temperature sensor 4 outputs, the laser tube core desired temperature that i.e. case temperature detection signal correction of exporting with temperature sensor 4 is preset, thus compensated because the laser tube core Temperature Influence that the temperature variation of laser assembly encapsulating housing is brought.
Fig. 2 has shown first embodiment of TEC control section of the present invention, and as shown in Figure 2, T EC control section comprises:
Temperature acquisition and signal conditioning circuit 51, accept the case temperature detection signal of temperature sensor 4 outputs, and just the value of this signal and the laser tube core desired temperature in the circuit 51 compare, and obtain and export signal as the laser tube core desired temperature through revising;
Error-detector circuit 52 receives the die temperature detection signal that thermistor 2 is exported, and value and the laser tube core desired temperature through revising of die temperature detection signal compared, and obtains and the output error detection signal;
Thermoelectric refrigerating unit driving circuit 54 is used under the control of described control signal, and the driving signal of described thermoelectric refrigerating unit TEC3 is flow through in output, and wherein said driving signal is the electric current that changes size and Orientation according to described control signal.
The thermoelectric refrigerating unit control device also comprises the margining detecting circuit 55 of moving into one's husband's household upon marriage for detection of the case temperature maximum permissible value, when detecting value from the signal of described temperature acquisition and signal conditioning circuit 51 greater than its thresholding setting value, be used for turn-offing the enable signal in TEC loop to 54 outputs of TEC driving circuit.
Fig. 3 has shown the physical circuit principle of temperature acquisition and signal conditioning circuit 51, as shown in Figure 3, temperature acquisition and signal conditioning circuit 51 are a comparator circuit A1, its forward end receives the case temperature detection signal of temperature sensor 4 outputs, this detection signal is that its magnitude of voltage of obtaining at temperature sensor 4 after resistance R 2 dividing potential drops rises along with temperature and the voltage signal that reduces, its backward end receives the signal as the laser tube core desired temperature, i.e. fixed voltage signal.Therefore, along with the rising of case temperature, the voltage on the temperature sensor 4 reduces, thereby causes the output voltage of comparator circuit A1 to reduce.
Fig. 4 has shown the structure of error-detector circuit 52, error-detector circuit 52 can be a comparator circuit A2, its forward end receives from the signal of the laser tube core desired temperature through revising of temperature acquisition and signal conditioning circuit 51 (being the voltage signal of comparer A1 output), its backward end receives the die temperature detection signal of described thermistor 2 outputs, wherein thermistor 2 is formed bleeder circuit with fixed resistance R2, make that the difference of the voltage signal that it and A1 export has been reacted the poor of laser instrument actual die temperature and setting value at the voltage signal of thermistor 2 acquisition reflection die temperatures.
Fig. 4 has also shown the circuit theory of temperature controller 53 and TEC driving circuit 54, as shown in Figure 4, temperature controller 54 is one and carries out PID (P-ratio, the I-integration, the D-differential) operational amplifier A 3 of algorithm (being the PID controller), TEC driving circuit 54 is the power amplifiers with Enable Pin.The PID controller obtains the controlled quentity controlled variable of TEC electric current by pid control algorithm, and this controlled quentity controlled variable is as the input signal of power amplifier, and the driving force by power amplifier drives the TEC parts, realizes having the laser tube core temperature control of ambient temperature compensation.
When environment temperature when higher, for the die temperature that makes laser instrument is stabilized in lower fixed value, need very big TEC working current, produce very big heat.If the radiating treatment of laser assembly is improper, these heats can not in time distribute and will make the die temperature formation positive feedback that further raises, and in order to overcome this shortcoming, the present invention is provided with the margining detecting circuit 55 of moving into one's husband's household upon marriage that detects the case temperature maximum permissible value.
As shown in Figure 5, the margining detecting circuit 55 of moving into one's husband's household upon marriage that detects the case temperature maximum permissible value is made of comparer A4, and its forward end receives the output of comparer A1, and its backward end receives the high threshold setting value of case temperature.
As described above, when the laser assembly case temperature raise, the output of operational amplifier A 1 reduced.Relatively, this predefined magnitude of voltage has reacted the ceiling temperature value of laser assembly housing as the input of hysteresis comparator and predefined magnitude of voltage (be case temperature high threshold setting value) the output of operational amplifier A 1.When the output of operational amplifier A 1 during less than predefined magnitude of voltage (this shows that case temperature is greater than maximum permissible value), comparer A4 output logic low level ' 0 '.The logic low of this comparer output is input to the control end that enables of power amplifier that high level enables, protects laser assembly thereby realize closing power amplifier when the temperature of laser assembly housing is higher than predefined thresholding.The hysteresis comparator hysteresis is to prevent, the laser assembly case temperature is when the ceiling temperature value annex of laser assembly housing, and the output of comparer is shaken.
Fig. 6 has shown the schematic diagram of second embodiment of TEC control section of the present invention, and TEC control section shown in Figure 6 comprises:
Case temperature detection signal and thermistor 2 output tube core temperature detection signals to temperature sensor 4 outputs carry out analog-to-digital analog to digital converter;
Digital signal to analog to digital converter output compares processing, with the control signal of exporting control TEC respectively and the processor MCU of turn-offing the enable signal in TEC loop;
Digital controlled signal to processor output carries out digital-to-analog conversion, with the digital to analog converter of output analog control signal; And
According to the analog control signal of described digital to analog converter output and the enable signal of processor output, carry out the control of TEC size of current and direction and TEC and turn-off the TEC driving circuit of control.
Device shown in Figure 6 is sent in the processor MCU after the temperature value that is sampled to is utilized the analog-digital converter sampling; in MCU, utilize software algorithm realization PID control and temperature to cross limit protection protection, the temperature controlled quentity controlled variable that obtains is outputed to the control of power driving circuit realization temperature by digital analog converter.If it is out-of-limit that software algorithm detects temperature, then the I/O pin of MCU output control signal is turn-offed the TEC circuit, the protection laser assembly.
The temperature-controlled process that has the laser instrument of thermoelectric refrigerating unit of the present invention may further comprise the steps:
Utilize the die temperature of the laser instrument in the thermistor 2 detection laser assembly housings 1, obtain and export the tube core temperature detection signal;
Utilize the case temperature of temperature sensor 4 detection laser assembly housings 1, obtain and the output housing temperature detection signal; And
According to described die temperature detection signal and case temperature detection signal, size of current and the direction of thermoelectric refrigerating unit TEC 3 flow through in control, comprising:
Utilize the described laser tube core desired temperature of case temperature detection signal correction of described temperature sensor 4 outputs;
The value of the die temperature detection signal of described thermistor 2 outputs and laser tube core desired temperature through revising are compared;
According to described comparative result, size of current and the direction of thermoelectric refrigerating unit TEC3 flow through in control, controls the die temperature of described laser instrument thus.
Wherein, compare by value and laser tube core desired temperature with the case temperature detection signal of described temperature sensor 4 outputs, obtain described laser tube core desired temperature through correction.
Said method of the present invention also comprises and detects the case temperature maximum permissible value, during greater than described case temperature maximum permissible value, turn-offs the step in thermoelectric refrigerating unit loop with convenient case temperature.
Fig. 7 has shown the software flow pattern of realizing said method of the present invention in the embodiment shown in fig. 6, at first initialization processor MCU, D/A converter, A/D converter and I/O port; Then read the A/D transformation result; Whether judge case temperature greater than the case temperature maximum set value, if greater than setting value, switch-off power amplifier then; If be not more than setting value, then carry out pid algorithm, export result of calculation then to D/A converter, with control power amplifier (being thermoelectric refrigerator driving circuit) executable operations.
Laser temperature control method and the device that has thermoelectric refrigerating unit of the present invention can bring following beneficial effect:
1. can compensate because the error of the control accuracy that the thermal resistance between thermistor and the laser tube core causes, and can compensate since the temperature variation of laser assembly encapsulating housing bring to the laser tube core Temperature Influence.
2. stability that can detection laser component package housing is to close TEC control loop and laser instrument when it surpasses the certain high temperature thresholding, thereby prevents the laser assembly cause thermal damage.
Although above the present invention is had been described in detail, the invention is not restricted to this, those skilled in the art of the present technique can carry out various modifications according to principle of the present invention.Therefore all modifications of doing according to the principle of the invention all should be understood to fall into protection scope of the present invention.
Claims (8)
1. temperature control equipment that has the laser instrument of thermoelectric refrigerating unit is characterized in that comprising:
Thermistor (2), for detection of the die temperature of the laser instrument in the laser assembly housing (1), and output tube core temperature detection signal;
Thermoelectric refrigerating unit TEC (3) is for the die temperature of control laser instrument;
Temperature sensor (4), for detection of the case temperature of laser assembly housing (1), and the output housing temperature detection signal; And
The TEC control section, be used for utilizing the case temperature detection signal correction laser tube core desired temperature of described temperature sensor (4) output, the value of the die temperature detection signal of described thermistor (2) output and laser tube core desired temperature through revising are compared, and size of current and the direction of TEC (3) are flow through in control according to comparative result;
Wherein, described TEC control section comprises:
Temperature acquisition and signal conditioning circuit (51), after being used for value with the case temperature detection signal of described temperature sensor (4) output and comparing processing with the laser tube core desired temperature, obtain and export as the signal through the laser tube core desired temperature of correction;
Error-detector circuit (52) after being used for value with the die temperature detection signal of described thermistor (2) output and comparing processing with described laser tube core desired temperature through revising, obtains also output error detection signal;
Temperature controller (53) is used for obtaining and export the control signal of control TEC by calculating described error detection signal;
Thermoelectric refrigerating unit driving circuit (54) is used under the control of described control signal, and the driving signal of described thermoelectric refrigerating unit TEC (3) is flow through in output, and wherein said driving signal is the electric current that changes size and Orientation according to described control signal.
2. device according to claim 1, it is characterized in that described TEC control section also comprises the margining detecting circuit of moving into one's husband's household upon marriage (55) for detection of the case temperature maximum permissible value, when detecting from the case temperature of the signal representative of described temperature acquisition and signal conditioning circuit (51) greater than described case temperature maximum permissible value, be used for turn-offing the enable signal in TEC loop to TEC driving circuit (54) output.
3. device according to claim 1 is characterized in that described temperature sensor (4) is the negative tempperature coefficient thermistor that is attached on the laser assembly housing (1).
4. device according to claim 3, it is characterized in that described temperature acquisition and signal conditioning circuit (51) are comparator circuit, its forward end receives the case temperature detection signal of temperature sensor (4) output, and its backward end receives the signal as the laser tube core desired temperature.
5. device according to claim 4, it is characterized in that described error-detector circuit (52) is comparator circuit, its forward end receives the signal from the laser tube core desired temperature of conduct through revising of temperature acquisition and signal conditioning circuit (51), and its backward end receives the die temperature detection signal of described thermistor (2) output.
6. device according to claim 1 is characterized in that described TEC control section also comprises:
Case temperature detection signal and thermistor output tube core temperature detection signal to temperature sensor (4) output carries out analog-to-digital analog to digital converter respectively;
Digital signal to analog to digital converter output compares processing, with the control signal of exporting control TEC respectively and the processor that turn-offs the enable signal in TEC loop;
Digital controlled signal to processor output carries out digital-to-analog conversion, with the digital to analog converter of output analog control signal; And
According to the analog control signal of described digital to analog converter output and the enable signal of processor output, carry out the control of TEC size of current and direction and TEC and turn-off the TEC driving circuit of control.
7. temperature-controlled process that has the laser instrument of thermoelectric refrigerating unit is characterized in that may further comprise the steps:
Utilize the die temperature of the laser instrument in thermistor (2) the detection laser assembly housing (1), obtain and export the tube core temperature detection signal;
Utilize the case temperature of temperature sensor (4) detection laser assembly housing (1), obtain and the output housing temperature detection signal; And
According to described die temperature detection signal and case temperature detection signal, size of current and the direction of thermoelectric refrigerating unit TEC (3) flow through in control, comprising:
Utilize the described laser tube core desired temperature of case temperature detection signal correction of described temperature sensor (4) output;
The value of the die temperature detection signal of described thermistor (2) output and laser tube core desired temperature through revising are compared;
According to described comparative result, size of current and the direction of thermoelectric refrigerating unit TEC (3) flow through in control, controls the die temperature of described laser instrument thus;
Wherein, compare by value and laser tube core desired temperature with the case temperature detection signal of described temperature sensor (4) output, obtain described laser tube core desired temperature through correction.
8. method according to claim 7 is characterized in that also comprising and detects the case temperature maximum permissible value, is used for when case temperature during greater than described case temperature maximum permissible value the step in shutoff thermoelectric refrigerating unit loop.
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| CN 201010001203 CN101776929B (en) | 2010-01-04 | 2010-01-04 | Temperature control method and device of laser with thermoelectric refrigerating unit |
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| CN 201010001203 CN101776929B (en) | 2010-01-04 | 2010-01-04 | Temperature control method and device of laser with thermoelectric refrigerating unit |
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| CN103050884A (en) * | 2012-12-28 | 2013-04-17 | 北京航天易联科技发展有限公司 | Driving method of laser tube core semiconductor refrigerator |
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| CN107703590A (en) * | 2017-09-27 | 2018-02-16 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module and its temprature control method |
| WO2020142955A1 (en) * | 2019-01-09 | 2020-07-16 | 深圳市大疆创新科技有限公司 | Ranging device and mobile platform |
| CN112445252A (en) * | 2019-08-30 | 2021-03-05 | 武汉永鼎光通科技有限公司 | Laser tube shell temperature adjusting and controlling method based on TEC |
| CN112612311A (en) * | 2020-12-15 | 2021-04-06 | 四川华拓光通信股份有限公司 | Method for realizing TEC control through bidirectional selection of MCU (micro control Unit) and TEC controller |
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| CN115942723B (en) * | 2023-03-14 | 2023-06-06 | 成都川美新技术股份有限公司 | Device and method for enhancing gain stability of optical path |
| CN116026301B (en) * | 2023-03-24 | 2023-06-16 | 中国船舶集团有限公司第七〇七研究所 | Wavelength self-compensation method and device of fiber optic gyroscope, electronic equipment and storage medium |
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