CN202406334U - Rapid automatic temperature compensating and driving module of superradiation light emitting diode - Google Patents

Abstract

The utility model relates to a rapid automatic temperature compensating and driving module of a superradiation light emitting diode, comprising an SLD chip module and a microprocessor for controlling the operating temperature of the SLD chip module. The output terminal of the microprocessor is connected to the thermoelectric refrigerator in the SLD chip module through a first D/A converter and a thermoelectric refrigerator driver; the output terminal of the microprocessor is connected to the SLD pipe core in the SLD chip module through a second D/A converter and the thermoelectric refrigerator driver; the optical power signal generated by the SLD pipe core is connected to the input terminal of the microprocessor through a photoelectric detector and the first A/D converter; and the thermistor in the SLD chip module is connected to the microprocessor through a temperature sampling circuit and the second A/D converter. According to the utility model, the stability is high, the versatility is strong, no stable state error is generated, and the response speed is high.

Description

Fast automatic temperature-compensating of super-radiance light emitting diode and driver module

Technical field

The utility model relates to a kind of compensation and driver module, and fast automatic temperature-compensating of especially a kind of super-radiance light emitting diode and driver module belong to the technical field of super-radiance light emitting diode.

Background technology

The performance of super-radiance light emitting diode (SLD) is between laser diode (LD) and light-emitting diode (LED).It has two big characteristics short-phase dry length and high-output powers.At present, widespread usage is at aspects such as optic fiber gyroscope (FOG), optical time domain reflectometer (OTDR), optical frequency territory reflectometer (OFDR), white light interferometer, distributing optical fiber sensings.The SLD stability of light source has bigger influence to the precision and the stability of these systems, so the output of control SLD high stable is extremely important.

The SLD stability of light source mainly is divided into power stability and wavelength stability.Influence two stability that factor is temperature and drive current of SLD high stable output.Along with the increase of temperature, the SLD Output optical power will reduce, and centre wavelength will move to long wavelength's direction.SLD is a current driving apparatus, and the stability of SLD drive current has directly determined the stability of SLD Output optical power.

At present, commercially available SLD chip module is made up of SLD tube core, negative tempperature coefficient thermistor, TEC (TEC), three parts.This designs simplification SLD temperature Control work, but high stability SLD design for temperature control system and development are still a urgent problem.Thermistor and TEC can be expressed as inertial element:

$H\left(S\right)=\frac{K}{\mathrm{TS}+1}---\left(1\right)$

K is gain in the formula (1), and T is the response time.

The SLD temperature controlling adopts ratio (P), proportional integral (PI) or PID (PID) control of simulation usually, and the PID of preset parameter (PID) is digital control.Owing to lack thermistor and TEC accurate parameters, need confirm the parameter of control system through a large amount of experiments.The temperature controlled precision of these class methods is not high, and debugging work load is big, and response speed is slow, the control weak effect, and also versatility is poor.

Summary of the invention

The purpose of the utility model is to overcome the deficiency that exists in the prior art, and fast automatic temperature-compensating of a kind of super-radiance light emitting diode and driver module are provided, and its stability is high, highly versatile, and no steady-state error, response speed is fast.

According to the technical scheme that the utility model provides, fast automatic temperature-compensating of said super-radiance light emitting diode and driver module comprise the SLD chip module and are used to control the microprocessor of SLD chip module working temperature; The output of said microprocessor links to each other with TEC in the SLD chip module through first D/A converter and TEC driver, and the output of microprocessor passes through second D/A converter and SLD tube core driver and links to each other with SLD tube core in the SLD chip module; The optical power signals that said SLD tube core produces links to each other with the input of microprocessor through photodetector, first A/D converter; Thermistor in the SLD chip module links to each other with microprocessor through the temperature sampling circuit and second A/D converter.

Said SLD tube core links to each other with photodetector through 1 * 2 coupler, and the splitting ratio of said 1 * 2 coupler is 1: 9, and 1 * 2 coupler arrives photodetector with 10% beam split of SLD tube core luminous power.

Said microprocessor comprises multiplier; The input of said multiplier links to each other with temperature setting module and anticipatory control link respectively; The output of multiplier links to each other with controller; Anticipatory control link and controller link to each other with parameter calculating module, comprise the swept signal generator that is used to produce swept-frequency signal in the microprocessor.

Said microprocessor also comprises the low-power control-signals generator, and said low-power control-signals generator links to each other with the SLD tube core through second D/A converter and SLD tube core driver.

The input of said parameter calculating module links to each other with first A/D converter; The output of controller and swept signal generator links to each other with TEC through first D/A converter and TEC driver, and the input of anticipatory control link links to each other with second A/D converter.

Said microprocessor sends the swept-frequency signal of 0.01Hz～1MHz to TEC through first D/A converter and TEC driver.

1), based on the transmission characteristic of thermistor and TEC the advantage of the utility model:, designed temperature control system, control system is reduced to the single order closed-loop system, reduced Control Parameter debugging work.2), thermistor is used anticipatory control, the response time of having improved temperature control system significantly, strengthened the ability of installing anti-environmental temperature fluctuation, guaranteed the high stable output of SLD tube core.3), the method that frequency sweep-recurrence method is obtained inner thermistor of SLD chip module and TEC parameter has been proposed, the parameter of acquisition is accurately reliable.4) utilize the relation of SLD tube core Output optical power and die temperature, with the temperature that SLD tube core output light comes sensing SLD tube core 1, the parameter of each link of final decision The whole control system can detect temperature control effect simultaneously.All get parms again when 5) device starts at every turn, so applicability is strong.The calculation of parameter of the parameter testing of thermistor and TEC, anticipatory control link and controller and the control of the automatic temperature-adjusting of SLD tube core, driving realize that by same device adaptability is strong, and is simple to operate.

Description of drawings

Fig. 1 is the structured flowchart of the utility model.

Fig. 2 is the block diagram of the utility model SLD tube core automatic temperature-adjusting control system.

Fig. 3 measures the structured flowchart of thermistor and TEC parameter for adopting frequency sweep-recurrence method.

Fig. 4 is the flow chart of the utility model frequency sweep-recursive algorithm.

Fig. 5 is the circuit theory diagrams of the utility model SLD tube core driver.

Fig. 6 is the circuit theory diagrams of the utility model TEC driver.

Fig. 7 is the circuit theory diagrams of the utility model photodetector.

Fig. 8 is the circuit theory diagrams of the utility model temperature sampling circuit.

Description of reference numerals: the 1-SLD operating current is set interface; The 2-SLD working temperature is set interface; The 3-microprocessor; 4-first D/A converter; 5-second D/A converter; 6-TEC driver; 7-SLD tube core driver; The 8-SLD chip module; 9-1 * 2 couplers; The 10-photodetector; 11-first A/D converter; The 12-temperature sampling circuit; 13-second A/D converter; The 14-swept signal generator; The 15-controller; 16-temperature setting module; The 17-multiplier; 18-low-power control-signals generator; 19-parameter calculating module and 20-anticipatory control link.

Embodiment

Below in conjunction with concrete accompanying drawing and embodiment the utility model is described further.

At present, SLD chip module 8 comprises SLD tube core 81, thermistor 82 and TEC 83, and said SLD tube core 81 and thermistor 81 are attached on the TEC 83, detect the temperature of SLD tube core 81 through thermistor 82.

As shown in Figure 1: as to open temperature controlled stability and rapidity in order to improve SLD tube core 81; Microprocessor 3 links to each other with TEC 83 through first D/A converter 4 and TEC driver 6, is used to drive TEC 83 and produces certain refrigerating capacity.The output of microprocessor 3 links to each other with SLD tube core 81 through second D/A converter 5 and SLD tube core driver 7, is used to drive 81 work of SLD tube core.Thermistor 81 links to each other with microprocessor 3 through the temperature sampling circuit 12 and second A/D converter 13; SLD tube core 81 outwards produces optical power signals; The luminous power that SLD tube core 81 produces is carried out beam split through 1 * 2 coupler 9; The splitting ratio of said 1 * 2 coupler 9 is 1: 9, and coupler 9 is assigned to photodetector 10 with 10% the optical power signals that SLD tube core 81 produces, and carries out light signal by photodetector 10 and receives and carry out opto-electronic conversion.In the input microprocessor 3, microprocessor 3 can adopt processor chips commonly used after the electrical signal conversion after photo-detector 10 will be changed through first A/D converter 11.The input of microprocessor 3 also sets interface 1 with the SLD operating current respectively and SLD working temperature setting interface 2 links to each other; Set the operating current that interface 1 is set SLD tube core 81 through the SLD operating current, set the working temperature that interface 2 is set SLD tube core 81 through the SLD working temperature.

As shown in Figure 2: as to comprise multiplier 17 in the said microprocessor 3; The input temperature setting module 16 of said multiplier 17 and anticipatory control link 20 link to each other; The output of multiplier 17 links to each other with controller 15; The output of said controller 15 links to each other with first D/A converter 4, and first D/A converter 4 also links to each other with swept signal generator 14 corresponding to an end that links to each other with controller 15.Parameter calculating module 19 links to each other with controller 15 and anticipatory control link 20, and parameter calculating module 19 can be with the parameter that controller 15 and anticipatory control link 20 are set after calculating parameter.Second D/A converter 5 links to each other with low-power control-signals generator 18, and the low-power signal that low-power control-signals generator 18 produces drives 81 work of SLD tube core through second D/A converter 5 and SLD tube core driver 7.The input of anticipatory control link 20 links to each other with second A/D converter 13, and thermistor 82 forms the feedback loop that SLD tube core 81 is controlled through the temperature sampling circuit 12 and second A/D converter 13 with anticipatory control link 20.As shown in Figure 3: the frequency sweep-recurrence that forms SLD chip modules 8 through respective modules in first D/A converter 4, TEC driver 6, thermistor 82, TEC 83, temperature sampling circuit 12, second A/D converter 13 and the microprocessor 3 is measured the parameter measurement structure of thermistor 82 and TEC 83.

According to above-mentioned fast automatic temperature-compensating of super-radiance light emitting diode and the driver module of being used for, can access a kind of control method that is used for fast automatic temperature-compensating of super-radiance light emitting diode and driver module, said control method comprises the steps:

A, the startup stage, microprocessor 3 sends swept-frequency signals through first D/A converter 4 to TEC 83, makes TEC 83 produce corresponding refrigerating capacity; Utilize temperature sampling circuit 12 to gather the temperature-voltage signal of thermistor 82, obtain the amplitude-versus-frequency curve of thermistor 82 and TEC 83;

The frequency that said microprocessor 3 sends swept-frequency signal is 0.01Hz～1MHz; Microprocessor 3 sends swept-frequency signal through swept signal generator 14;

B, according to the amplitude-versus-frequency curve of above-mentioned acquisition, through recursive algorithm, obtain the two-stage response time T 1 and the T2 of thermistor 82 and the second order link of connecting of TEC 83;

Said employing recursive algorithm is:

$\left\{\begin{array}{c}{T}_1\left(0\right)={\mathrm{mag}}^{-1}(-3)\\ T_2(k+1)=\frac{2\mathrm{\π}}{{2f}_{\max }-1/T_1\left(k\right)+\mathrm{mag}\left(f_{\max }\right)/20}\\ {\mathrm{mag}2}_{k+1}\left(f\right)=201g\frac{1}{\sqrt{T_2^2(k+1)f^2/\left({4\mathrm{\π}}^2\right)+1}}\\ {\mathrm{mag}1}_{k+1}\left(f\right)=\mathrm{mag}\left(f\right)-{\mathrm{mag}2}_{k+1}\left(f\right)\\ T_1(k+1)={\mathrm{mag}1}_{k+1}^{-1}(-3)\end{array}\right.$

Wherein, mag (f) is the thermoelectric thermistor 82 normalization log magnitude-frequency characteristics function that link obtains of connecting with TEC 83; Mag1 _k(w), Mag2 _k(w) represent with T respectively ₁(k) and T ₂(k) be the normalization log magnitude-frequency characteristics function of time constant; Mag ^-1(mag), Mag1 _k ^-1(mag) be respectively Mag (w), Mag1 _k(w) inverse function; F is the frequency of swept-frequency signal; Parameter calculating module 19 in the microprocessor 3 is carried out recurrence according to the amplitude-versus-frequency curve that obtains according to recurrence flow process among Fig. 4 and recursive algorithm, obtains the responsive time constant T1 and the T2 of thermistor 82 and TEC 83 respectively; In the flow chart of Fig. 4: U is the amplitude of swept-frequency signal; F is a frequency; Mag is the range value (dB) of log magnitude-frequency characteristics curve; Mag _DCDC current gain for series system; N is the sum of the every column element of two-dimensional array [W, Mag]; E1, e2 are computational accuracy.

C, according to the response time T1 of the thermistor 82 that obtains and the response time T2 of TEC 83, the parameter of anticipatory control links and controller in the microprocessor 3 is set;

Utilize anticipatory control link 20 to improve the response speed of thermistor 82; Thermistor 82 can be expressed as first order inertial loop, and its transfer function is:

$H_R\left(S\right)=\frac{K_R}{T_{R}S+1}---\left(2\right)$

Wherein, T _RBe the response time of thermistor, K _RBe its gain.

Hence one can see that, and the transfer function of anticipatory control link 20 should be:

$H_A\left(S\right)=\frac{T_{1}s+1}{T_{A}s+1}(T_A<<T_R)---\left(3\right)$

Wherein, T _AInertia coeffeicent for the anticipatory control link.

Adopt zero pole cancellation method to confirm the algorithm and the parameter of controller 15; TEC 83 also can be expressed as first order inertial loop, and its time constant is T ₂Work as T _ABe far smaller than T ₁The time, the road of feedback can near-sighted proportional link, utilizes zero pole cancellation method, guarantees the no steady-state error of output simultaneously, and the control algolithm of controller should be proportional integral (PI), and its transfer function does

$H_C\left(s\right)=K_C\frac{T_{2}s+1}{s}---\left(4\right)$

Wherein, K _CGain for control module; Temperature control system is reduced to the single order closed-loop system, reduces T _A, increase K _CJust can reduce the response time of temperature control system, simultaneity factor is exported almost non-overshoot, and device is not had impact damage.

D, microprocessor 3 are sampled through the luminous power of 10 pairs of SLD tube cores 81 of photodetector; Power-voltage curve when obtaining 81 work of SLD tube core; According to the vibration of the power-voltage curve that is obtained, come the anticipatory control link 20 and controller 15 parameters that are provided with in the verification microprocessor 3; When anticipatory control link in the microprocessor 3 20 and controller 15 parameters are provided with the check coupling, SLD tube core 81 operate as normal, otherwise microprocessor 3 is adjusted the parameter that is provided with of anticipatory control links 20 and controller 15.

Constant when SLD tube core 81 operating currents, the temperature of SLD tube core 81 Output optical power and SLD tube core 81 is monotonic relationshi, and SLD tube core 81 temperature are low more, and power output is big more.Thus, can draw the variations in temperature of SLD tube core 81 through observing the variation of SLD tube core 81 Output optical power under the constant current state.

With response time parameter T ₁, T ₂Be set to anticipatory control link 20 and controller 15 respectively; The parameter setting finishes, the start-up temperature closed-loop control, in this simultaneously; Microprocessor 3 sends SLD low-power operation current controling signal through low-power signal generator 18; Through second D/A converter 5, SLD tube core driver 7, drive SLD tube core 8 and send faint light, utilizing splitting ratio is that 1: 91 * 2 coupler 9 converts 10% output light to power-voltage signal via photodetector 10; Via first A/D converter 11, feed back to microprocessor 3.Microprocessor 3 recording powers-voltage signal curve.Work as T ₁Be the thermistor response time, power signal curve dead-beat, otherwise signal curve has vibration.In view of the above, microprocessor 3 judges whether to exchange the parameter of two links.

The SLD operating current is set in interface 1 and the SLD working temperature setting interface 2 and all through button corresponding work electric current and working temperature is set.

As shown in Figure 5: the anode tap of said SLD tube core 81 links to each other with power supply VCC; The cathode terminal of SLD tube core 81 links to each other with the collector electrode of triode Q1; The base terminal of triode Q1 links to each other with the output of four-operational amplifier A4, and the end of oppisite phase of four-operational amplifier A4 links to each other with the emitter of triode Q1, and the in-phase end of four-operational amplifier A4 links to each other with resistance R 7; The emitter of triode Q1 is through resistance R 8 ground connection; When microprocessor 3 sent the low-power control signals through second D/A converter 5, four-operational amplifier A4 made triode Q1 conducting, thereby 81 conductings of SLD tube core are luminous.

As shown in Figure 6: an end of said TEC 83 links to each other with the end of oppisite phase of the 3rd operational amplifier A 3, and the other end links to each other with the output of the 3rd operational amplifier A 3, the in-phase end ground connection of the 3rd operational amplifier A 3.TEC 83 links to each other with the output and the end of oppisite phase of second operational amplifier A 2 corresponding to an end that links to each other with the 3rd operational amplifier A 3, and the in-phase end of second operational amplifier A 2 is through resistance R 9 and voltage V _TinLink to each other voltage V _TinProduce through TEC driver 6 backs by microprocessor 3.

As shown in Figure 7: said photodetector 10 comprises photodiode PIN; The anode tap of said photodiode PIN links to each other with voltage VEE; The cathode terminal of photodiode PIN links to each other with the end of oppisite phase of the 6th operational amplifier A 6, the in-phase end ground connection of the 6th operational amplifier A 6.The indirect feedback resistance Rf of the output of the 6th operational amplifier A 6 and end of oppisite phase.

As shown in Figure 8: temperature sampling circuit 12 comprises the 5th operational amplifier A 5; The end of oppisite phase of said the 5th operational amplifier A 5 links to each other with the output of the 5th operational amplifier A 5; The in-phase end of the 5th operational amplifier A 5 is through resistance R 12 ground connection, and resistance R 12 is passed through resistance R T and voltage V corresponding to an end that links to each other with the 5th operational amplifier A 5 _REFLink to each other said voltage V _REFBe reference voltage, the output through the 5th operational amplifier A 5 can access temperature-voltage signal.

Like Fig. 1～shown in Figure 8: the device initial start-up, at first, set the operating current that interface 1 is set SLD tube core 81 through the SLD operating current, set the working temperature that interface 2 is set SLD tube cores 81 through the SLD working temperature.After the each startup of device; The swept-frequency signal that microprocessor 3 sends 0.01Hz to 1MHz; Convert analog voltage signal to through first D/A converter 4; Drive driver 6 control TEC work through TEC, the response voltage signal of the series system that temperature sampling circuit 12 output TECs 83 and thermistor 82 are formed flows to microprocessor 3 through second A/D converter 13.Through the recursive algorithm among Fig. 4, calculate the two-stage response time parameter of the series connection second order link of thermistor 82 and TEC 83, and be provided with to anticipatory control link in the microprocessor 3 20 and controller 15 respectively.After completion is set; The temperature closed loop control that startup is made up of controller 15, second D/A converter 5, SLD tube core driver 7, SLD tube core 81, temperature sampling circuit 12, second A/D converter 13 and anticipatory control link 20; In this simultaneously, microprocessor 3 sends SLD low-power operation current controling signal, through second D/A converter 5, SLD tube core driver 7; Drive SLD tube core 81 and send faint light; Utilize splitting ratio be 1: 91 * 2 coupler 9 with 10% output light convert power-voltage signal to via photodetector 10, via first A/D converter 11, feed back to microprocessor.Microprocessor 3 recording powers-voltage signal curve.Work as T ₁Be set at the thermistor response time, and the power signal curve dead-beat that obtains in the microprocessor 3, otherwise signal curve has vibration; In view of the above, microprocessor 3 judges whether to exchange the parameter of two links.Parameter testing finishes; Little processing 3 will be set the power control signal that interface 1 obtain SLD tube core 81 from the SLD operating current, and send to SLD tube core driver 7 via second D/A converter 5, and SLD tube core driver 7 is converted into electric current with voltage signal; It is luminous to drive SLD tube core 81; So far, module initialization work is accomplished, the module operate as normal.

The calculation of parameter of parameter testing, anticipatory control link 20 and the controller 15 of the utility model thermistor 82 and TEC 83 and the control of the automatic temperature-adjusting of SLD tube core 81, driving realize that by same device adaptability is strong, and is simple to operate.

1), based on the transmission characteristic of thermistor 82 and TEC 83 advantage of the utility model:, designed temperature control system, control system is reduced to the single order closed-loop system, reduced Control Parameter debugging work.2), thermistor 81 is used anticipatory controls, the response time of having improved temperature control system significantly, strengthened the ability of installing anti-environmental temperature fluctuation, guaranteed the high stable output of SLD tube core 81.3), the method that frequency sweep-recurrence method is obtained SLD chip module 8 inner thermistors 82 and TEC 83 parameters has been proposed, the parameter of acquisition is accurately reliable.4) utilize the relation of SLD tube core 81 Output optical power and die temperature, with the temperature that SLD tube core 81 output light come sensing SLD tube core 81, the parameter of each link of final decision The whole control system can detect temperature control effect simultaneously.All get parms again when 5) device starts at every turn, so applicability is strong.

Claims (6)

1. fast automatic temperature-compensating of super-radiance light emitting diode and driver module comprise SLD chip module (8) and are used to control the microprocessor (3) of SLD chip module (8) working temperature; It is characterized in that: the output of said microprocessor (3) links to each other with the interior TEC (83) of SLD chip module (8) through first D/A converter (4) and TEC driver (6), and the output of microprocessor (3) links to each other with the interior SLD tube core (81) of SLD chip module (8) through second D/A converter (5) and SLD tube core driver (7); The optical power signals that said SLD tube core (81) produces links to each other with the input of microprocessor (3) through photodetector (10), first A/D converter (11); Thermistor (82) in the SLD chip module (8) links to each other with microprocessor (3) through temperature sampling circuit (12) and second A/D converter (13).

2. fast automatic temperature-compensating of super-radiance light emitting diode according to claim 1 and driver module; It is characterized in that: said SLD tube core (81) links to each other with photodetector (10) through 1 * 2 coupler (9); The splitting ratio of said 1 * 2 coupler (9) is 1:9, and 1 * 2 coupler (9) arrives photodetector (10) with 10% beam split of SLD tube core (81) luminous power.

3. fast automatic temperature-compensating of super-radiance light emitting diode according to claim 1 and driver module; It is characterized in that: said microprocessor (3) comprises multiplier (17); The input of said multiplier (17) links to each other with temperature setting module (16) and anticipatory control link (20) respectively; The output of multiplier (17) links to each other with controller (15); Anticipatory control link (20) and controller (15) link to each other with parameter calculating module (19), comprise the swept signal generator (14) that is used to produce swept-frequency signal in the microprocessor (3).

4. fast automatic temperature-compensating of super-radiance light emitting diode according to claim 3 and driver module; It is characterized in that: said microprocessor (3) also comprises low-power control-signals generator (18), and said low-power control-signals generator (18) links to each other with SLD tube core (81) through second D/A converter (5) and SLD tube core driver (7).

5. fast automatic temperature-compensating of super-radiance light emitting diode according to claim 3 and driver module; It is characterized in that: the input of said parameter calculating module (19) links to each other with first A/D converter (11); The output of controller (15) and swept signal generator (14) links to each other with TEC (83) through first D/A converter (4) and TEC driver (6), and the input of anticipatory control link (20) links to each other with second A/D converter (13).

6. fast automatic temperature-compensating of super-radiance light emitting diode according to claim 1 and driver module is characterized in that: said microprocessor (3) sends the swept-frequency signal of 0.01Hz ~ 1MHz to TEC (83) through first D/A converter (4) and TEC driver (6).

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