CN106549300A - A kind of temperature control circuit of semiconductor laser - Google Patents
A kind of temperature control circuit of semiconductor laser Download PDFInfo
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- CN106549300A CN106549300A CN201510608327.1A CN201510608327A CN106549300A CN 106549300 A CN106549300 A CN 106549300A CN 201510608327 A CN201510608327 A CN 201510608327A CN 106549300 A CN106549300 A CN 106549300A
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Abstract
The present invention devises a kind of temperature control circuit design of semiconductor laser for being applied to and temperature adjusting being carried out to quasiconductor, the circuit structure is simple, output impedance is high, output voltage error reduces, measuring accuracy is high, and flexible design, system response can be accelerated, reduce regulating time, increase the stability of system.Overcome existing H bridges temperature measurement circuit and easily produce non-linear distortion, and regulation and control speed is slower, less stable, the relatively low shortcoming of control accuracy.
Description
Technical field
The present invention relates to a kind of temperature control circuit of semiconductor laser, it is adaptable to need to carry out quasiconductor the occasion of temperature adjusting.
Background technology
Semiconductor laser (LD) has the advantages that small volume, efficiency high, low-power consumption drive and be easy to modulation, at present, is widely used in the fields such as communication, medical treatment, Precision Machining and detection.The stability of LD operating temperatures has a strong impact on which and goes out optical property lI-al.First, LD threshold currents are raised with the rising of temperature, in the case of driving current constant.Light power becomes strong with the rising of temperature；Secondly, temperature is raised makes outgoing optical wavelength that red shift to occur, and red shift amount is about 0.2-0.4 nm/。C, particularly in some application scenarios, the stability for going out optical property to LD has strict demand. therefore.It is necessary to take automatic temperature-adjusting control (ATC) measure. make laser tube core steady operation at a temperature of the setting.Controls of the generally ATC using the refrigeration or heating function realization of thermoelectric refrigerator (TEC) to target object temperature.The most frequently used is exactly common H bridges temperature measurement circuit and constant flow source measuring circuit temperature.And the non-linear distortion that existing H bridges temperature measurement circuit is easily produced, and regulation and control speed is slower, less stable, control accuracy are relatively low.And constant flow source measuring circuit temperature regulation and control speed, good stability.Therefore a kind of regulation and control speed, accurate temperature control circuit are designed particularly significant.
The content of the invention
There is error for the temperature control circuit open-loop unstable, peak point current and the average current that overcome existing semiconductor laser, speed is slow for regulation and control, precision is low, improve the noiseproof feature of semiconductor laser temperature control circuit, realize that regulation and control speed is fast, the performance of easily controllable, high precision, the present invention devises a kind of quasiconductor that is applied to carries out the semiconductor laser temperature control circuit of temperature adjusting.
The technical solution adopted for the present invention to solve the technical problems is：
Important four part is devised in semiconductor laser temperature control circuit：The peripheral circuit of temperature measurement circuit, constant-current source circuit PID compensation circuits and single-chip control circuit.Circuit is based on monolithic thermoelectric cooling control chip ADN8830, using close loop negative feedback structure, replace common H bridge type temperature measurement circuit using constant flow source measuring circuit temperature, solve the problems, such as nonlinearity erron, passing ratio integral differential (PID) compensation circuit produces control signal, thermoelectric refrigerator (TEC) is driven, the high-precision control to LD operating temperatures is realized.
Wherein temperature measurement circuit part adopts (NTC) critesistor as temperature sensor using negative temperature coefficient, its resistance reduces with the rising of temperature, using the bridge-type temperature measurement circuit structure based on constant-current source, simple circuit structure, output voltage error reduction, measuring accuracy can be caused to improve.The PID compensation circuits of a high-speed, high precision being devised simultaneously, deviation being remembered and integrated after introducing integration control energy, differential control carries out differential to error, variation tendency reaction to error is sensitive, system response can be accelerated, reduce regulating time, increase the stability of system.
The invention has the beneficial effects as follows：Temperature measurement circuit part adopts (NTC) critesistor as temperature sensor using negative temperature coefficient, using the bridge-type temperature measurement circuit structure based on constant-current source, simple circuit structure, output voltage error reduction, measuring accuracy can be caused to improve.The PID compensation circuits of a high-speed, high precision are devised, system response can be accelerated, reduced regulating time, increase the stability of system.Overcome existing H bridges temperature measurement circuit and easily produce non-linear distortion, and regulation and control speed is slower, less stable, the relatively low shortcoming of control accuracy.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is temperature measurement circuit.
Fig. 2 is constant-current source circuit.
Fig. 3 is PID compensation circuits.
Fig. 4 is control chip peripheral circuit.
In Fig. 1, IC1A is temperature control chip ADN8830.
In Fig. 3, IC1 is temperature control chip ADN8830.
Specific embodiment
In Fig. 1, constant-current source output current, critesistor both end voltage are the product of current source output current and resistance R7.LD operating temperatures are set by the partial pressure relation of adjustment branch road R8, R9.When temperature of the measurement is equal to design temperature, AV=0；When LD operating temperatures change, R7 correspondences change, it can be seen that：Voltage knots modification is with resistance knots modification linear change.Thermometric branch voltage is input to ADN8830 by THERMIN feet and TEMPSET feet respectively with design temperature branch voltage.
In Fig. 2, constant current source module adopts AD706 operational amplifiers, the features such as which has high input impedance low-power consumption.The normal phase input end of feedback signal input operational amplifier, it is grounded after anti-phase input terminating resistor R21, its 8 foot connects 18V voltages, 4 feet are grounded, 1 foot connects the base stage of audion Q3 as output pin, the in-phase input end diode cathode of its drain electrode connecting resistance R15 and operational amplifier B connects 18V power supplys, anode connecting resistance R15 and RS1, the in-phase input end of another termination B amplifiers of R15, the out-phase input of another termination B amplifiers of RS1, series capacitance Cap between 6 feet and 7 feet of B amplifiers, output pin 7 connect diode D7 anodes, and its negative electrode connecting resistance R22 is followed by 18V power supplys.
In Fig. 3, PID compensation circuits are the key links in temperature control loops.It is the important leverage for realizing high-precision control.Can remember after introducing integration control energy and integrate deviation.The deviation of very little can also be accumulated and be controlled accordingly, but integral action always lags behind deviation, cause system to be easy to vibration, and controlled variable fluctuation is very big.Differential control carries out differential to error, and the variation tendency reaction to error is sensitive, can accelerate system response, reduce regulating time, increase the stability of system, and which has the disadvantage sensitive to interference.Rational choice is carried out to 3 parameters of PID compensation circuits, to reach optimal Comprehensive Control effect.ADN8830 has been internally integrated low noise compensation amplifier.It and the peripheral circuit between TEMPCTL feet, COMPFB feet and COMPOUT feet constitute PID compensation circuits, wherein, Rl and R3 controls proportionality coefficient.C1 and R3 controls integration time constant, and C2 and Rl controls derivative time constant.CF can increase the stability of compensation circuit.Satisfied control effect is obtained by adjusting each component parameters.
In Fig. 4, P1 drives periphery PMOS and NMOS to be operated in switching mode using the PWM way of outputs with NI feet, and P2 then drives periphery PMOS and NMOS using linear mode with N2 feet.ADN8830 has been internally integrated agitator.Reference clock is provided for PWM mode. its frequency is determined by the resistance that FREQ feet are concatenated into ground.
Claims (5)
1. a kind of temperature control circuit of semiconductor laser, devises important four part：Temperature measurement circuit, the peripheral circuit of constant-current source circuit, PID compensation circuits and single-chip control circuit, it is characterized in that circuit is based on monolithic thermoelectric cooling control chip ADN8830, using close loop negative feedback structure, replace common H bridge type temperature measurement circuit using constant flow source measuring circuit temperature, solve the problems, such as nonlinearity erron, passing ratio integral differential (PID) compensation circuit produces control signal, thermoelectric refrigerator (TEC) is driven, the high-precision control to LD operating temperatures is realized.
2. temperature measurement circuit according to claim 1, it is characterized in that using negative temperature coefficient using (NTC) critesistor as temperature sensor, its resistance reduces with the rising of temperature, using the bridge-type temperature measurement circuit structure based on constant-current source, wherein constant-current source output current, critesistor both end voltage is the product of current source output current and resistance R7, sets LD operating temperatures by the partial pressure relation of adjustment branch road R8, R9；When temperature of the measurement is equal to design temperature, AV=0；When LD operating temperatures change, R7 correspondences change, and voltage knots modification is with resistance knots modification linear change；Thermometric branch voltage is input to ADN8830 by THERMIN feet and TEMPSET feet respectively with design temperature branch voltage.
3. a kind of temperature control circuit of semiconductor laser according to claim 1 and 2, is characterized in that the constant-current source circuit, using AD706 operational amplifiers, the features such as which has high input impedance low-power consumption；The normal phase input end of feedback signal input operational amplifier, it is grounded after anti-phase input terminating resistor R21, its 8 foot connects 18V voltages, 4 feet are grounded, 1 foot connects the base stage of audion Q3 as output pin, the in-phase input end diode cathode of its drain electrode connecting resistance R15 and operational amplifier B connects 18V power supplys, anode connecting resistance R15 and RS1, the in-phase input end of another termination B amplifiers of R15, the out-phase input of another termination B amplifiers of RS1, series capacitance Cap between 6 feet and 7 feet of B amplifiers, output pin 7 connect diode D7 anodes, and its negative electrode connecting resistance R22 is followed by 18V power supplys.
4. PID compensation circuits design according to claim 1, it is characterized in that the PID compensation circuits are made up of ADN8830, ADN8830 has been internally integrated low noise compensation amplifier, it and the peripheral circuit between TEMPCTL feet, COMPFB feet and COMPOUT feet constitute PID compensation circuits, wherein, Rl and R3 controls proportionality coefficient, and C1 and R3 controls integration time constant, C2 and Rl controls derivative time constant, and CF can increase the stability of compensation circuit；The part that satisfied control effect occurs is obtained by adjusting each component parameters.
5. the peripheral circuit of single-chip control circuit according to claim 1, P1 drives periphery PMOS and NMOS to be operated in switching mode using the PWM way of outputs with NI feet, and P2 then drives periphery PMOS and NMOS using linear mode with N2 feet, ADN8830 has been internally integrated agitator, provides reference clock for PWM mode. and its frequency is determined by the resistance that FREQ feet are concatenated into ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510608327.1A CN106549300A (en) | 2015-09-22 | 2015-09-22 | A kind of temperature control circuit of semiconductor laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510608327.1A CN106549300A (en) | 2015-09-22 | 2015-09-22 | A kind of temperature control circuit of semiconductor laser |
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| CN106549300A true CN106549300A (en) | 2017-03-29 |
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| CN201510608327.1A Pending CN106549300A (en) | 2015-09-22 | 2015-09-22 | A kind of temperature control circuit of semiconductor laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109508055A (en) * | 2018-11-28 | 2019-03-22 | 北京遥测技术研究所 | Temperature in spaceborne laser based on negative-feedback controls analog closed-loop method and system |
| CN116170019A (en) * | 2023-01-06 | 2023-05-26 | 深圳市西京电力科技有限公司 | High-power electronic device based on semiconductor thermistor |
-
2015
- 2015-09-22 CN CN201510608327.1A patent/CN106549300A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109508055A (en) * | 2018-11-28 | 2019-03-22 | 北京遥测技术研究所 | Temperature in spaceborne laser based on negative-feedback controls analog closed-loop method and system |
| CN116170019A (en) * | 2023-01-06 | 2023-05-26 | 深圳市西京电力科技有限公司 | High-power electronic device based on semiconductor thermistor |
| CN116170019B (en) * | 2023-01-06 | 2024-05-24 | 深圳市首创达电子科技有限公司 | High-power electronic device based on semiconductor thermistor |
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Application publication date: 20170329 |
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