CN102946049A - Drive and temperature control circuit of quantum cascade laser - Google Patents
Drive and temperature control circuit of quantum cascade laser Download PDFInfo
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- CN102946049A CN102946049A CN2012104587326A CN201210458732A CN102946049A CN 102946049 A CN102946049 A CN 102946049A CN 2012104587326 A CN2012104587326 A CN 2012104587326A CN 201210458732 A CN201210458732 A CN 201210458732A CN 102946049 A CN102946049 A CN 102946049A
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Abstract
The invention relates to a drive and temperature control circuit of a quantum cascade laser, which belongs to the technical field of electrons. The drive and temperature control circuit is used for supplying accurate and adjustable pulse width modulation (PWM) drive voltage to the quantum cascade laser and for precisely controlling the working environment temperature of the quantum cascade laser. The drive and temperature control circuit comprises a single chip microprocessor, an adjustable voltage stabilizing source, a temperature control module, a PWM control module and a load protection module. The drive and temperature control circuit is simple in design and convenient to use; the work status of the laser load can be comprehensively monitored, an over-current protection function is realized, high-voltage breakdown is prevented, the pulse width adjustability is good, the pulse width can be minimized to ns grade, adjustable pulse width and adjustable working frequency can be realized, stable working temperature is achieved, and laser generated by the quantum cascade laser which is sensitive to the ambient temperature can be maintained at constant optical wavelength.
Description
Technical field
The invention belongs to electronic technology field, relate in particular to a kind of drive circuit and adjustable temperature-control circuit of temperature that produces the quantum cascade laser (QCL) of accurate adjustable narrow pulse signal.
Technical background
Quantum cascade laser (QCL) is based on the Novel unipolar alternate semiconductor device of electronics conduction band intersubband transitions and phonon secondary resonance tunnelling principle in semiconductor quantum well.Be different from the compound stimulated radiation mechanism of electron-hole of traditional p-n junction type semiconductor laser, QCL stimulated radiation process only has electronics to participate in, and the selection of excitation wavelength can realize by the potential well of active area and the cutting of being with of potential barrier.It is the perfect light source of gas-monitoring and free-space communication.Has very widely application prospect at aspects such as infrared communication, long-range detection, air pollution monitoring, industrial fumes analysis, chemical process monitoring, molecular spectrum research, not damaged medical diagnosiss.The sharp scheme of penetrating of QCL is to utilize perpendicular to the separate electronic attitude that is caused by quantum limitation effect in the heterojunction semiconductor thin layer of nanometer grade thickness, produce population inversion between these excitation state, the active area of this laser is formed (usually greater than 500 layers) and is realized the multi-photon output that single electron injects by the multi-stage serial connection of coupling quantum well.
The type of drive of QCL has two kinds: a kind of is constant current drive mode, and another kind is pulse-width modulation (PWM) type of drive.Constant current drive mode only need to guarantee to flow through the current constant of laser, just can be so that fine, the effective work of laser energy has had a large amount of constant-current driving power supplies that is specifically designed to laser to occur on market; The power utilization efficient of this kind type of drive is too low, the electric energy of the overwhelming majority all consumes in the internal resistance of laser, cause the significant wastage of energy, and need the heat dissipation equipment of design relatively high power could be so that the long steady operation of laser, like this so that the driving arrangement volume of QCL becomes huger.The QCL laser of PWM type of drive work, in general its operating frequency is about 10KHz, the high impulse time at tens ns between the 2us, its working pulse accounts for below 2% of work period, QCL than constant current work aspect energy utilization rate is much higher, and because the heat energy that the QCL of PWM type of drive work produces is far smaller than the QCL of constant current work, aspect the control of QCL working temperature, much easier, do not need very powerful radiator just can guarantee that laser works under stable temperature environment, its effective time can prolong greatly.
In a kind of PWM type of drive of existing QCL, adopted the adjustable voltage-stabilizing output circuit modules of three traditional ends (as shown in Figure 2), its output voltage is by adjusting variable resistor R
2The resistance size obtain, its output voltage expression formula is Vout=1.25 (1+R
2/ R
1)+I
AdjR
2, namely the voltage of node 221 is that the voltage of node 222 adds 1.25V, because I
AdjValue very little, usually can ignore, therefore output voltage V out expression formula can be abbreviated as Vout=1.25 (1+R
2/ R
1), by the output voltage that the resistance acquisition of adjusting R2 is wanted, traditional three-terminal voltage-stabilizing chip majority is reduction regulation, namely requires output voltage V out to be lower than input voltage vin.Because what the adjustable voltage-stabilizing output circuit module of traditional three ends adopted is the variable resistor that precision is lower, volume is larger so that the precision of output voltage V out lower, can not satisfy high-precision application demand.
Summary of the invention
For the existing technical problem of standing crop qc laser (QCL) drive circuit, the invention provides a kind of quantum cascade laser drives and temperature-control circuit, this driving and temperature-control circuit have that operating voltage is adjustable, the pwm pulse width is less and are accurately adjustable, have simultaneously the controlled characteristics of working temperature, adopt this driving and temperature-control circuit, can make the QCL laser obtain more stable optical maser wavelength, and can be long-time, work expeditiously.
Technical solution of the present invention is as follows:
A kind of quantum cascade laser drives and temperature-control circuit (as shown in Figure 1); be used for providing accurately adjustable PWM driving voltage and the operating ambient temperature of accurate controlled quentity controlled variable qc laser to quantum cascade laser (QCL), comprise a single-chip microcomputer, a digital and Adjustable, a temperature control modules, a PWM control module and a load protection module.
Described single-chip microcomputer is used for the operating ambient temperature of set amount qc laser, set amount qc laser operating frequency, set amount qc laser working pulse width, adjust the digital and Adjustable output voltage values, the operating state of monitoring laser device is in time turn-offed main circuit when operating current is excessive simultaneously; Described digital and Adjustable is for generation of the required operating voltage of quantum cascade laser; Described PWM control module is used for accurate controlled quentity controlled variable qc laser ON time flows through the laser load with change average current; Described temperature control modules comprises temperature sensing, heating and cooling part, is used for the assurance laser and works under stationary temperature; Described load protection module is used for the normal operation of guaranteed discharge qc laser.
Quantum cascade laser provided by the invention drives and temperature-control circuit, adopts single-chip microcomputer that quantum cascade laser operating current voltage is waken up with a start intelligence and regulates control, is applicable to the narrow pulse laser that various pulse current amplitudes are not more than 3A.Adopt quantum cascade laser provided by the invention to drive and temperature-control circuit, quantum cascade laser operating voltage and pulse duration, operating frequency can be made things convenient for timely regulates, and can guarantee that laser works under the temperature of setting, the quantum cascade laser under the state of working long hours can stably be worked effectively.Be compared to existing quantum cascade laser PWM drive circuit, quantum cascade laser provided by the invention drives and temperature-control circuit has good burst pulse characteristic, output voltage is in time adjustable, operating frequency, pulse duration are accurately adjustable, prolong the advantage such as the quantum cascade laser characteristic changing is little with the operating time.
Description of drawings
Fig. 1 is the structural representation of quantum cascade laser driving provided by the invention and temperature-control circuit.
Fig. 2 is traditional three-terminal voltage-stabilizing output circuit schematic diagram.
Figure 3 shows that existing a kind of adjustable voltage-stabilizing output circuit module of boosting.
Fig. 4 is the circuit diagram of digital and Adjustable in quantum cascade laser driving provided by the invention and the temperature-control circuit.
Fig. 5 is PWM control module and load protection module circuit diagram in quantum cascade laser driving provided by the invention and the temperature-control circuit.
Fig. 6 is temperature control modules circuit diagram in quantum cascade laser driving provided by the invention and the temperature-control circuit.
Embodiment
A kind of quantum cascade laser drives and temperature-control circuit (as shown in Figure 1); be used for providing accurately adjustable PWM driving voltage and the operating ambient temperature of accurate controlled quentity controlled variable qc laser to quantum cascade laser (QCL), comprise a single-chip microcomputer, a digital and Adjustable, a temperature control modules, a PWM control module and a load protection module.
Described single-chip microcomputer is used for the operating ambient temperature of set amount qc laser, set amount qc laser operating frequency, set amount qc laser working pulse width, adjust the digital and Adjustable output voltage values, the operating state of monitoring laser device is in time turn-offed main circuit when operating current is excessive simultaneously; Described digital and Adjustable is for generation of the required operating voltage of quantum cascade laser; Described PWM control module is used for accurate controlled quentity controlled variable qc laser ON time flows through the laser load with change average current; Described temperature control modules comprises temperature sensing, heating and cooling part, is used for the assurance laser and works under stationary temperature; Described load protection module is used for the normal operation of guaranteed discharge qc laser.
Figure 3 shows that existing a kind of adjustable voltage-stabilizing output circuit module of boosting, its output voltage expression formula is Vcc=1.23 (1+R
4/ R
3), the resistance of R3 is generally got more than the 10K, is certain fixed value, obtains the output voltage of wanting by the resistance of adjusting R4.This type of switching mode voltage boosting and stabilizing circuit has lower operating voltage, and input voltage range is larger, and the power supply output node is owing to there being larger capacitor filtering, and output voltage is more stable, and very high conversion efficiency is arranged.But because its adjustable resistance R4 that adopts is common potentiometer, its output accuracy is limited, can not obtain accurate output voltage V cc.
Figure 4 shows that the particular circuit configurations of digital and Adjustable in quantum cascade laser driving provided by the invention and the temperature-control circuit.This digital and Adjustable comprises step-up switching power supply chip U1, digital potentiometer U2, biasing resistor R4, divider resistance R3 and relevant energy storage inductor L1, diode D1, voltage-stabiliser tube D2, filter capacitor C1, C2, C3, current-limiting resistance R1, R2.Input voltage signal Vin connects the LX end of switching power source chip U1 on the one hand by energy storage inductor L1, connect on the other hand the Vcc end of switching power source chip U1 by the first current-limiting resistance R1; In parallel with the first filter capacitor C1 after the second current-limiting resistance R2 connects with the second filter capacitor C2, be connected between the Vcc end and GND end of switching power source chip U1; The positive pole of voltage-stabiliser tube D2 connects the GND end that closes power supply chip U1, and its negative pole connects the Vcc end of switching power source chip U1; The tie point of the second current-limiting resistance R2 and the second filter capacitor C2 connects the CE end of switching power source chip U1; The LX end of switching power source chip U1 is connected to output voltage node Vcc by rectifier diode D1; Storage capacitor C3 positive pole is connected to output voltage node Vcc, and negative pole is connected to the GND end; The FB end of switching power source chip U1 is connected to output voltage node Vcc by the first divider resistance R3, is connected to simultaneously the RH(resistance high potential of digital potentiometer U2 by the second divider resistance R4) end; The RW(of the digital potentiometer U2 output of sliding) end and RL(resistance low potential) end is connected to GND after linking to each other and holds; The U/P(up/down of digital potentiometer U2 counting enables) end, the input of INC(count pulse) end links to each other with the single-chip processor i/o port respectively.Output voltage node magnitude of voltage Vcc=1.23 (1+R
3/ (R
4+ R
(U2))).
Digital potentiometer U2 in the circuit and the same power supply circuits of master controller one-chip machine common, the resistance value of U2 digital potentiometer is 50K Ω when initialization, then total biasing resistor resistance is (50K Ω+R
4), for getting suitable voltage vcc, the resistance value of R4 is got 30K Ω here, and the R3 resistance value is got 480K Ω.Because the input with booster circuit is not identical for the power supply circuits of digital potentiometer U2, when U2 did not have power supply or just initialization to finish, its resistance was maximum 50K Ω, and at this moment output voltage values Vcc only is 8.61V.This magnitude of voltage does not reach the threshold voltage of QCL, is added in the upper electric current of QCL minimum, can not be so that loaded work piece, and load plays a very good protection to laser for this.When being its minimum value 4K Ω by single-chip microcomputer adjustment U2 potentiometer resistance, the magnitude of voltage of Vcc reaches and is 18.59V to the maximum.So consider it is in order to adapt to the QCL laser of different model, the laser optimum operating voltage of its coupling is between 12V-17V.For obtaining more accurate voltage, two resistance (R3 and R4) all are that precision is all lower fixed carbon resisters of 0.5% temperature coefficient and voltage coefficient.The effect of the voltage stabilizing didoe D2 of this circuit is the value of expansion input voltage vin, and the chip U1 supply power voltage VCC that boosts when the fluctuation of input Vin value is larger is clamped at 5V, guarantees that chip can work.Only need to required voltage be set by the external button of single-chip microcomputer among the present invention so that laser works in constant voltage mode or by arrange electric current then with reference to the accompanying drawings the current sample in 4 automatically adjust the value of output voltage V cc.
Figure 5 shows that the concrete driving circuit structure schematic diagram that comprises PWM control module, load QCL and load protection module, comprise the QCL load, with high-speed switch impulse controller spare U1, the high-speed switch NMOS of Enable Pin pipe Q1, NPN type triode Q2, resistance R 1, R2 and capacitor C 1 and Schottky diode D1.The output voltage V cc of digital and Adjustable described in Fig. 4 provides operating voltage for the QCL load, and capacitor C 1 and Schottky diode D1 are parallel to QCL load two ends; The drain electrode of high-speed switch NMOS pipe Q1 connects the negative pole of QCL load, and its source electrode is by the parallel circuits ground connection of resistance R 2 with capacitor C 2, and its grid links to each other with output port with the high-speed switch impulse controller spare U1 of Enable Pin; The drain electrode of high-speed switch NMOS pipe Q1 and resistance R 2 connect the I/O port that has the ADC function in the single-chip microcomputer with the tie point of the parallel circuits of capacitor C 2; When having the Enable Pin of high-speed switch impulse controller spare U1 of Enable Pin, the collector electrode tape splicing of NPN type triode Q2 meets the output voltage V cc of digital and Adjustable by resistance R 1, its grounded emitter, and its base stage (EN) connects the common i/o port of single-chip microcomputer; Connect the pwm control signal of single-chip microcomputer output with the input port (IN) of the high-speed switch impulse controller spare U1 of Enable Pin, the output voltage V cc of its power supply termination digital and Adjustable, its earth terminal ground connection.
When being connected to the one-chip machine port output high level of EN, be low level with the high-speed switch impulse controller spare U1 Enable Pin of Enable Pin, U1 quits work, and the grid of Q1 is low level, and Q1 manage cut-off, and the electric current that flows through load QCL at this moment is zero.When EN was low level, the U1 Enable Pin was high level, and U1 received the level signal of PWM and in output port output, gave the Q1 charge or discharge this moment.Because U1 has very strong driving force, so that the time that opens and shuts off of high-speed switch NMOS pipe Q1 is about 10ns, therefore the pwm control signal of single-chip microcomputer output can go out to reappear at QCL preferably, the pwm signal of single-chip microcomputer only need to be set, with regard to the pulse duration of energy more accurate ground controlled loading on load QCL, pulse duration minimum of the present invention is adjusted at about 20ns.Signal output port VF is as the feedback of load circuit, is for to the circuital current monitoring with the working pulse electric current is set and establishes; Work as load short circuits; when overtension perhaps being set causing electric current excessive; the pressure drop VF at resistance R 2 two ends surpasses the threshold value that single-chip microcomputer arranges; single-chip microcomputer is to high level of EN port output; thereby that turn-offs device U1 enables the switching off load circuit; output circuit produces larger electric current when laser load QCL short circuit, and at this moment the too high single-chip microcomputer that also can make of VF current potential in time reacts anergy chip U1, reaches the purpose of protective circuit.The value of resistance R 2 is determined by the conducting resistance that single-chip processor i/o bears voltage capability and NMOS pipe Q1, adopts precision higher, the resistance that power is larger, and its value is about 100m Ω.The requirement of choosing of capacitor C 2 is to use preferably high frequency Leaded Ceramic Disc Capacitor of high frequency characteristics.Schottky diode D1 adopts the less diode of forward voltage drop, forward voltage drop such as MBRS340TR only has 0.43V, reverse voltage to load QCL has preferably clamping action, prevent from damaging the load laser because of voltage oscillation, simultaneously Schottky diode D1 reverse breakdown voltage will be at the load maximum voltage greater than 20% nargin, and the forward saturation current also is the factor that will consider.Similarly, it is the same with capacitor C 2 that capacitor C 1 is chosen requirement.
Figure 6 shows that temperature control modules, comprise a slice have two-way output current the TEC driver module and, the reference voltage port Ref of TEC driver module is by divider resistance R and thermistor Rt ground connection, the I/O port that Current Control port CTr and the single-chip microcomputer of TEC driver module has the DAC function is connected, the SHD port of TEC driver module is connected to the common i/o port of single-chip microcomputer, TEC driver module work when SHD is high level, semiconductor chilling plate TEC gives QCL refrigeration or the heating of being close in the above, and the TEC driver module was not worked when SHD was low level.
During the normal operation of TEC driver module, provide the reference voltage of a 1.5V at the Ref port.TEC driver module output current computing formula is I=(V
CTr-V
Ref) * 8.As Current Control port V
CTrVoltage during greater than 1.5V cooling piece give that to be close to the QCL carrier surface be QCL load refrigeration; Otherwise, work as V
CTrVoltage heats to the QCL load during less than 1.5V.V
CTrMagnitude of voltage is provided by the DAC port of single-chip microcomputer.Port SHD is connected to the common i/o port of single-chip microcomputer, TEC driver module work when SHD is high level, and semiconductor chilling plate TEC gives QCL refrigeration or the heating of being close in the above, and the TEC driver module was not worked when SHD was low level.Directly be connected on the Ref is a divider resistance R(resistance 5K Ω), divider resistance R holds by thermistor Rt with being connected to.Thermistor is chosen as the NTC type, and resistance is 10K Ω in the time of 25 ℃, and this moment, the voltage of Vref was V
Ref=V
Ref* (R/ (R+R
t))=0.5V.When 0.5 ℃ of fluctuation of temperature, minimum 220 ohm of its change in resistance, namely minimum change voltage is 7.29mV.Receive the ADC input port of single-chip microcomputer by port Vref.Because the ADC precision of single-chip microcomputer is 12, its resolution is 0.6mV, and the resolution that single-chip microcomputer is the highest so is 0.05 ℃.Because TEC has a time delay in heating or refrigeration, the present invention between 10 ℃ to 40 ℃, accomplishes ± 0.1 ℃ precision on temperature control modules, and this precision satisfies the requirement of its constant temperature work fully concerning load QCL.
In the present embodiment, when external equipment (transformer etc.) when power supply is provided, consider to have three input voltages for the stability of circuit, give respectively booster circuit module, single-chip microcomputer digital potentiometer, temperature control modules power supply, they are common ground.Booster circuit module for power supply voltage is about 5V, and single-chip microcomputer digital potentiometer supply power voltage is 3.3V, and the temperature control modules supply power voltage is for 5V and can provide electric current greater than 5A to enable to obtain preferably refrigeration.During plugged, because the resistance of digital potentiometer is maximum, the output voltage V cc of Fig. 4 is 8.61V, is carried in the voltage in the laser load owing to being lower than the laser normal working voltage, and Q1 is in off state during owing to the single-chip microcomputer initialization, and the electric current that flows through laser is zero.Set the operating voltage (or operating current) of laser from single-chip microcomputer, the operating frequency of setting laser device and pulse duration, treat after the adjustable Voltage stabilizing module output voltage stabilization, enable control chip U1 for the low level of single-chip processor i/o mouth output that is connected to EN port among Fig. 5, load circuit is started working.In the time of laser works, according to the laser loaded work piece temperature of setting and the comparison of ambient temperature, whether determine the open temp control module by program, in actual the use in a short period of time just energy so that laser under stable temperature, work.Simultaneously the ADC port-monitoring of single-chip microcomputer the electric current in the load circuit, automatically regulates the electric current that flows through laser when setting the operating current size, and can be when being necessary rapid switching off load circuit, the load of protection laser is not damaged.As shown in Figure 5, the high level voltage of laser load normal operation is V
ZL=Vcc-V
SAT-VF.The resistance of resistance R 2 about 0.1 Ω, V
SATBe about 0.1V.
From the above mentioned; the advantage of drive circuit of the present invention is; can be with the operating state of Real Time Monitoring load QCL; QCL be can set and voltage pwm pattern or electric current PWM pattern are operated in; and the energy Real-time Feedback is carried in voltage and electric current in the laser load; can be so that load under the state of constant temperature and work; can be in the situation that the timely cut-off current protective circuit plate of load short circuits; have narrower pulse duration and can accurately set, the following operating frequency of 100KHz is arbitrarily set with pulse height and is arbitrarily regulated at 12V-17V.Because adopt multiple-protection, load damages to laser to avoid voltage overshoot and reverse voltage, the surge voltage that produces when avoiding starting shooting causes the puncture of QCL load etc.
Claims (4)
1. a quantum cascade laser drives and temperature-control circuit, be used for providing accurately adjustable PWM driving voltage and the operating ambient temperature of accurate controlled quentity controlled variable qc laser to quantum cascade laser, comprise a single-chip microcomputer, a digital and Adjustable, a temperature control modules, a PWM control module and a load protection module;
Described single-chip microcomputer is used for the operating ambient temperature of set amount qc laser, set amount qc laser operating frequency, set amount qc laser working pulse width, adjust the digital and Adjustable output voltage values, the operating state of monitoring laser device is in time turn-offed main circuit when operating current is excessive simultaneously; Described digital and Adjustable is for generation of the required operating voltage of quantum cascade laser; Described PWM control module is used for accurate controlled quentity controlled variable qc laser ON time flows through the laser load with change average current; Described temperature control modules comprises temperature sensing, heating and cooling part, is used for the assurance laser and works under stationary temperature; Described load protection module is used for the normal operation of guaranteed discharge qc laser.
2. quantum cascade laser according to claim 1 drives and temperature-control circuit, it is characterized in that, described digital and Adjustable comprises step-up switching power supply chip U1, digital potentiometer U2, biasing resistor R4, divider resistance R3 and relevant energy storage inductor L1, diode D1, voltage-stabiliser tube D2, filter capacitor C1, C2, C3, current-limiting resistance R1, R2; Input voltage signal Vin connects the LX end of switching power source chip U1 on the one hand by energy storage inductor L1, connect on the other hand the Vcc end of switching power source chip U1 by the first current-limiting resistance R1; In parallel with the first filter capacitor C1 after the second current-limiting resistance R2 connects with the second filter capacitor C2, be connected between the Vcc end and GND end of switching power source chip U1; The positive pole of voltage-stabiliser tube D2 connects the GND end that closes power supply chip U1, and its negative pole connects the Vcc end of switching power source chip U1; The tie point of the second current-limiting resistance R2 and the second filter capacitor C2 connects the CE end of switching power source chip U1; The LX end of switching power source chip U1 is connected to output voltage node Vcc by rectifier diode D1; Storage capacitor C3 positive pole is connected to output voltage node Vcc, and negative pole is connected to the GND end; The FB end of switching power source chip U1 is connected to output voltage node Vcc by the first divider resistance R3, is connected to simultaneously the RH end of digital potentiometer U2 by the second divider resistance R4; RW end and the RL of digital potentiometer U2 is connected to the GND end after holding and linking to each other; The U/P end of digital potentiometer U2, the INC end links to each other with the single-chip processor i/o port respectively.
3. quantum cascade laser according to claim 1 drives and temperature-control circuit, it is characterized in that, the concrete drive circuit that comprises PWM control module, load QCL and load protection module comprises the QCL load, with high-speed switch impulse controller spare U1, high-speed switch NMOS pipe Q1, NPN type triode Q2, resistance R 1, R2 and capacitor C 1 and the Schottky diode D1 of Enable Pin; The output voltage V cc of digital and Adjustable provides operating voltage for the QCL load, and capacitor C 1 and Schottky diode D1 are parallel to QCL load two ends; The drain electrode of high-speed switch NMOS pipe Q1 connects the negative pole of QCL load, and its source electrode is by the parallel circuits ground connection of resistance R 2 with capacitor C 2, and its grid links to each other with output port with the high-speed switch impulse controller spare U1 of Enable Pin; The drain electrode of high-speed switch NMOS pipe Q1 and resistance R 2 connect the I/O port that has the ADC function in the single-chip microcomputer with the tie point of the parallel circuits of capacitor C 2; When having the Enable Pin of high-speed switch impulse controller spare U1 of Enable Pin, the collector electrode tape splicing of NPN type triode Q2 meets the output voltage V cc of digital and Adjustable by resistance R 1, its grounded emitter, and its base stage connects the common i/o port of single-chip microcomputer; Connect the pwm control signal of single-chip microcomputer output with the input port of the high-speed switch impulse controller spare U1 of Enable Pin, the output voltage V cc of its power supply termination digital and Adjustable, its earth terminal ground connection.
4. quantum cascade laser according to claim 1 drives and temperature-control circuit, it is characterized in that, temperature control modules comprise a slice have two-way output current the TEC driver module and, the reference voltage port Ref of TEC driver module is by divider resistance R and thermistor Rt ground connection, the I/O port that Current Control port CTr and the single-chip microcomputer of TEC driver module has the DAC function is connected, the SHD port of TEC driver module is connected to the common i/o port of single-chip microcomputer, TEC driver module work when SHD is high level, semiconductor chilling plate TEC gives QCL refrigeration or the heating of being close in the above, and the TEC driver module was not worked when SHD was low level.
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| CN109116885A (en) * | 2018-08-24 | 2019-01-01 | 北京无线电计量测试研究所 | The active balancing control device and method of thermal power in quantum voltage standard set-up |
| CN109193883A (en) * | 2018-11-28 | 2019-01-11 | 华勤通讯技术有限公司 | The charging base and its control circuit of smartwatch |
| EP3836328A1 (en) * | 2019-12-11 | 2021-06-16 | Veoneer Sweden AB | Reverse voltage protection |
| WO2021115757A1 (en) * | 2019-12-11 | 2021-06-17 | Veoneer Sweden Ab | Reverse voltage protection |
| CN111416277A (en) * | 2020-02-27 | 2020-07-14 | 电子科技大学 | Multipole quantum cascade ring laser |
| CN111416277B (en) * | 2020-02-27 | 2021-07-20 | 电子科技大学 | Multipole quantum cascade ring laser |
| CN111380262A (en) * | 2020-03-10 | 2020-07-07 | 广州市普东医疗设备股份有限公司 | Refrigeration and preheating drive control circuit and electrical equipment |
| CN111585157A (en) * | 2020-05-22 | 2020-08-25 | 江苏师范大学 | Numerical control driving power supply for intermediate infrared ultrafast laser |
| CN111585157B (en) * | 2020-05-22 | 2022-11-08 | 江苏师范大学 | Numerical control driving power supply for intermediate infrared ultrafast laser |
| 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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