CN204009625U - The temperature control system of laser instrument in a kind of laser on-line gas analysis instrument - Google Patents

The temperature control system of laser instrument in a kind of laser on-line gas analysis instrument Download PDF

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Publication number
CN204009625U
CN204009625U CN201420461913.9U CN201420461913U CN204009625U CN 204009625 U CN204009625 U CN 204009625U CN 201420461913 U CN201420461913 U CN 201420461913U CN 204009625 U CN204009625 U CN 204009625U
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China
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operational amplifier
resistance
laser
driving chip
capacitor
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CN201420461913.9U
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武学春
郭晓成
董超
刘武洲
丁桂峰
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SHANXI SENDAYUAN TECHNOLOGY Co Ltd
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SHANXI SENDAYUAN TECHNOLOGY Co Ltd
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Abstract

The temperature control system of laser instrument in a kind of laser on-line gas analysis of the utility model instrument, the technical matters solving is: the temperature control system that laser instrument in a kind of laser on-line gas analysis instrument with higher temperature control precision is provided, the technical scheme adopting is: comprise laser bodies, thermoelectric refrigerating unit driving circuit, fpga chip, PID controller, subtracter, voltage follower, DAC converter, ADC converter and temperature monitoring circuit, thermoelectric refrigerating unit driving circuit respectively with fpga chip, PID controller is connected with laser bodies, subtracter respectively with PID controller, voltage follower is connected with laser bodies, voltage follower is connected with fpga chip by DAC converter, fpga chip is also connected with temperature monitoring circuit with thermoelectric refrigerating unit driving circuit respectively by ADC converter, temperature monitoring circuit is connected with laser bodies, be applicable to field of lasers.

Description

The temperature control system of laser instrument in a kind of laser on-line gas analysis instrument
Technical field
The utility model relates to a kind of temperature control system, is specifically related to the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument.
Background technology
In laser on-line gas analysis system, laser instrument is very important device, in current laser on-line gas analysis system, the technology adopting has two kinds: directly absorption spectroscopy techniques and Wavelength modulation spectroscopy technology (WMS), compared to direct absorption spectroscopy techniques, Wavelength modulation spectroscopy technology (WMS) is more widely used because it can improve 100 ~ 1000 times by the measurement sensitivity of system; In the laser on-line gas analysis system of employing WMS, want accurately to measure the concentration of gas, the wavelength that just needing can be linearly, high resolving power ground changes laser instrument, and the wavelength of laser instrument is subject to the impact of temperature and produces drift with the light grating in probe, and then the performance of whole gas analysis system is affected.
In order to address the above problem, conventionally meeting set temperature controller in laser instrument, so that the internal temperature of laser instrument keeps within the specific limits, thereby reach the precision tuning to laser output wavelength, and the universal way of set temperature controller is in laser instrument: at laser instrument inner integrated thermal electric refrigerator (TEC) and thermistor, wherein, thermoelectric refrigerating unit (TEC) claim again semiconductor cooler, in the time having electric current to flow through from TEC, the heat that electric current produces can pass to opposite side from a side of TEC, like this, reach the heat absorption of TEC one end, the effect of other end heat release, and then realize heating and the refrigerating function of TEC, , when work, the temperature of the real-time detection laser of thermistor inside, process temperature-control circuit is controlled the size and Orientation of the electric current that flows through TEC, makes heat pass to opposite side from a side of TEC, thereby control the internal die temperature of laser instrument, ensure the normal work of laser instrument, the wavelength tuning range of Distributed Feedback Laser only reaches 3 ~ 5nm at present, and the line-width of gas is generally 10pm magnitude, calculates by theory, wants to realize the precision tuning of laser wavelength, and the temperature stability of temperature control system will reach more than 0.02 DEG C, at present, conventional TEC temperature-control circuit mostly adopts discrete component to build, and all determine parameter value according to designer's experience, control accuracy is lower, and discrete component is vulnerable to the interference of noise in design, not only make precision wayward, also make temperature control complete difficulty larger, stability is lower, and good its temperature control degree of stability of temperature controller just reaches 0.1 DEG C on home market, the temperature controller that can satisfy the demands on foreign market again price is high, have even up to several ten thousand U.S. dollars, therefore, need badly and seek a kind of independent research, there is the temperature control system for laser on-line gas analysis instrument laser instrument of high-precision temperature control performance, to reach the stable control output to laser wavelength.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical matters to be solved is: the temperature control system that laser instrument in a kind of laser on-line gas analysis instrument with higher temperature control precision is provided.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument, comprise: inside is provided with the laser bodies of thermoelectric refrigerating unit and thermistor, described temperature control system also comprises: thermoelectric refrigerating unit driving circuit, fpga chip, PID controller, subtracter, voltage follower, DAC converter, ADC converter and temperature monitoring circuit, described thermoelectric refrigerating unit driving circuit respectively with fpga chip, PID controller is connected with laser bodies, described subtracter respectively with PID controller, voltage follower is connected with laser bodies, described voltage follower is connected with fpga chip by DAC converter, described fpga chip is also connected with temperature monitoring circuit with thermoelectric refrigerating unit driving circuit respectively by ADC converter, described temperature monitoring circuit is connected with laser bodies.
Described thermoelectric refrigerating unit driving circuit comprises: the driving chip U1 that model is MAX1968, the analog power input end VDD of described driving chip U1 also meets all power input PVDD1 and is connected with+3.3V voltage after all power input PVDD2, the switching frequency selecting side FREQ ground connection of described driving chip U1, the analog power input end VDD of described driving chip U1 and in analog between be provided with filter capacitor C1, hold all power input PVDD1 that link together of described driving chip U1 and all powers that link together and between PGND1, be provided with filter capacitor C2, hold all power input PVDD2 that link together of described driving chip U1 and all powers that link together and between PGND2, be provided with filter capacitor C3, the reference voltage output terminal REF of described driving chip U1 and connect one end of filter capacitor C4 and one end of resistance R 1 after be connected with one end of resistance R 2, the other end ground connection of described filter capacitor C4, ground connection after the other end series resistor R3 of described resistance R 1, ground connection after the other end series resistor R4 of described resistance R 2, the maximum forward current value end MAXIP of described driving chip U1 is connected with reference voltage output terminal REF, the maximum reverse current end MAXIN of described driving chip U1 is connected with the line between resistance R 1 and resistance R 3, the maximum voltage end MAXV of described driving chip U1 is connected with the line between resistance R 2 and resistance R 4, the EP end of described driving chip U1 is connected with holding in analog GND, behind the shutoff control input end SHEN# of described driving chip U1 one end of connecting resistance R5, be connected with the control signal output terminals A 1 of described fpga chip, the other end ground connection of described resistance R 5, the current mirror output terminal ITEC of described driving chip U1 is connected with the signal input part B1 of described ADC converter, the Current Control compensation end COMP of described driving chip U1 is by capacitor C 5 ground connection, after linking together, all drive current output terminal LX2 of described driving chip U1 are connected with one end of inductance L 2, the other end of described inductance L 2 and connect one end of decoupling capacitor C6 after be connected with Voltage-output induction end OS2, the other end ground connection of described decoupling capacitor C6, after linking together, all drive current output terminal LX1 of described driving chip U1 are connected with one end of inductance L 1, the other end of described inductance L 1 and connect one end of decoupling capacitor C7 after be connected with electric current output induction end CS, the other end ground connection of described decoupling capacitor C7, in described laser bodies, behind the positive input terminal TEC+ of thermoelectric refrigerating unit one end of connecting resistance R6, be connected with the Voltage-output induction end OS1 of described driving chip U1, the other end of described resistance R 6 is connected with the electric current output induction end CS of described driving chip U1, in described laser bodies, behind one end of the negative input end TEC-shunt-wound capacitance C8 of thermoelectric refrigerating unit, be connected with the Voltage-output induction end OS2 of described driving chip U1, the other end of described capacitor C 8 is connected with the electric current output induction end CS of described driving chip U1, the TH-of thermistor end ground connection in described laser bodies, after the TH+ end series resistor R7 of thermistor, be connected with the reference voltage output terminal REF of described driving chip U1, described subtracter comprises: operational amplifier U2, behind one end of the inverting input of described operational amplifier U2 connecting resistance R13, hold the line between resistance R 7 to be connected with the TH+ of described thermistor, after the in-phase input end series resistor R8 of described operational amplifier U2, be connected with the output terminal of operational amplifier U2, behind one end of the power end shunt-wound capacitance C9 of described operational amplifier U2, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 9 and operational amplifier U2, described voltage follower comprises: operational amplifier U3, the in-phase input end of described operational amplifier U3 is connected with the output terminal C1 of described DAC converter, behind one end of the inverting input of described operational amplifier U3 connecting resistance R9, be connected with the output terminal of operational amplifier U3, the other end of described resistance R 9 is connected with the in-phase input end of described operational amplifier U2, described PID controller comprises: operational amplifier U4, the in-phase input end of described operational amplifier U4 is connected with the reference voltage output terminal REF of described driving chip U1, one end of the inverting input of described operational amplifier U4 connecting resistance R10, behind one end of one end of capacitor C 10 and capacitor C 11, be connected with one end of resistance R 11, behind one end of the other end of described resistance R 10 connecting resistance R12, be connected with the output terminal of described operational amplifier U2, the other end of described resistance R 12 is connected with the other end of described capacitor C 10, the other end of described resistance R 11 is connected with one end of capacitor C 12, after the other end of other end shunt-wound capacitance C11 of described capacitor C 12 and the output terminal of operational amplifier U4, be connected with the Current Control input end CTLI of described driving chip U1, behind one end of the power end shunt-wound capacitance C13 of described operational amplifier U4, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 13 and operational amplifier U4, described temperature monitoring circuit comprises: operational amplifier U5, the in-phase input end of described operational amplifier U5 is connected with one end of described resistance R 13, the inverting input of described operational amplifier U5 and connect the output terminal of operational amplifier U5 after be connected with the signal input part B2 of described ADC converter, behind one end of the power end shunt-wound capacitance C14 of described operational amplifier U5, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 14 and operational amplifier U5, the model of described operational amplifier U2 is AD8551, and the model of described operational amplifier U3 is AD8551, and the model of described operational amplifier U4 is AD8551, and the model of described operational amplifier U5 is AD8552.
The utility model compared with prior art has following beneficial effect:
Temperature control system in the utility model mainly comprises thermoelectric refrigerating unit driving circuit, fpga chip, PID controller, subtracter and voltage follower, thermoelectric refrigerating unit driving circuit respectively with fpga chip, PID controller is connected with laser bodies, subtracter respectively with PID controller, voltage follower is connected with laser bodies, voltage follower is connected with fpga chip by DAC converter, fpga chip is also connected with thermoelectric refrigerating unit driving circuit by ADC converter, laser bodies inside is provided with thermoelectric refrigerating unit and thermistor, thermistor utilizes characteristic that its resistance changes along with the variation of temperature to carry out the temperature of real-time detection laser internal die, and the temperature signal detecting is passed to subtracter, simultaneously, fpga chip passes to voltage follower by temperature reference signal through DAC converter, after isolation buffer computing by voltage follower, arrive subtracter, the temperature reference signal that the temperature detection signal that subtracter transmits thermistor and voltage follower transmit carries out differential amplification computing, and the differential signal after computing is passed to PID controller, the reference signal of this differential signal and self is carried out ratio-differentiate by PID controller, and the control signal after computing is sent to thermoelectric refrigerating unit driving circuit, thermoelectric refrigerating unit driving circuit produces and drives signal to be sent to the thermoelectric refrigerating unit in laser bodies according to this control signal, control thermoelectric refrigerating unit heating or refrigeration, accurately make the internal temperature of laser instrument keep within the specific limits, thereby reach the precision tuning to laser output wavelength, temperature control system in the utility model is a high performance PID feedback control network, and co-ordination between device is higher to the temperature control precision of laser instrument, has reached the stable control output to laser wavelength.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is described in more detail;
Fig. 1 is structural representation of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model;
In figure: 1 is thermoelectric refrigerating unit, 2 is thermistor, and 3 is laser bodies, and 4 is thermoelectric refrigerating unit driving circuit, 5 is fpga chip, and 6 is PID controller, and 7 is subtracter, and 8 is voltage follower, 9 is DAC converter, and 10 is ADC converter, and 11 is temperature monitoring circuit.
Embodiment
As shown in Figure 1, the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument, comprise: inside is provided with the laser bodies 3 of thermoelectric refrigerating unit 1 and thermistor 2, described temperature control system also comprises: thermoelectric refrigerating unit driving circuit 4, fpga chip 5, PID controller 6, subtracter 7, voltage follower 8, DAC converter 9, ADC converter 10 and temperature monitoring circuit 11, described thermoelectric refrigerating unit driving circuit 4 respectively with fpga chip 5, PID controller 6 is connected with laser bodies 3, described subtracter 7 respectively with PID controller 6, voltage follower 8 is connected with laser bodies 3, described voltage follower 8 is connected with fpga chip 5 by DAC converter 9, described fpga chip 5 is also connected with temperature monitoring circuit 11 with thermoelectric refrigerating unit driving circuit 4 respectively by ADC converter 10, described temperature monitoring circuit 11 is connected with laser bodies 3.
As shown in Figure 2, described thermoelectric refrigerating unit driving circuit 4 comprises: the driving chip U1 that model is MAX1968, the analog power input end VDD of described driving chip U1 also meets all power input PVDD1 and is connected with+3.3V voltage after all power input PVDD2, the switching frequency selecting side FREQ ground connection of described driving chip U1, described switching frequency selecting side FREQ is mainly used in arranging the frequency of pulse-length modulation (PWM) current drive signal in chip, in the time of FREQ=GND, the frequency of PWM current drive signal is 500KHz, in the time of FREQ=VDD, the frequency of PWM current drive signal is 1MHz, therefore, in chip in the present embodiment, the frequency of PWM current drive signal is 500K, the analog power input end VDD of described driving chip U1 and in analog between be provided with filter capacitor C1, hold all power input PVDD1 that link together of described driving chip U1 and all powers that link together and between PGND1, be provided with filter capacitor C2, hold all power input PVDD2 that link together of described driving chip U1 and all powers that link together and between PGND2, be provided with filter capacitor C3, wherein, filter capacitor C1, the power supply that filter capacitor C2 and filter capacitor C3 are mainly used in driving chip U1 carries out filtering, the reference voltage output terminal REF of described driving chip U1 and connect one end of filter capacitor C4 and one end of resistance R 1 after be connected with one end of resistance R 2, the other end ground connection of described filter capacitor C4, capacitor C 4 is mainly used in the reference voltage of reference voltage output terminal REF output to carry out filtering, in the present embodiment, the reference voltage of reference voltage output terminal REF output is 1.5V, ground connection after the other end series resistor R3 of described resistance R 1, ground connection after the other end series resistor R4 of described resistance R 2, the maximum forward current value end MAXIP of described driving chip U1 is connected with reference voltage output terminal REF, the maximum reverse current end MAXIN of described driving chip U1 is connected with the line between resistance R 1 and resistance R 3, the magnitude of voltage of MAXIP and MAXIN is set respectively maximum forward current value and the maximum reverse current that thermoelectric refrigerating unit 1 allows, and maximum forward, inverse current can arrange by electric resistance partial pressure respectively, the maximum voltage end MAXV of described driving chip U1 is connected with the line between resistance R 2 and resistance R 4, can limit by the voltage of MAXV the maximum voltage of thermoelectric refrigerating unit 1, and in the present embodiment, the voltage range of MAXV is 0 ~ 1.5V, the EP end of described driving chip U1 is connected with holding in analog GND, and the EP end in the present embodiment is for driving the packaging pin of chip U1, behind the shutoff control input end SHEN# of described driving chip U1 one end of connecting resistance R5, be connected with the control signal output terminals A 1 of described fpga chip 5, the other end ground connection of described resistance R 5, in the present embodiment, make to drive chip U1 to enter low-power consumption mode by the mode that SHEN# is dragged down, in the time driving chip U1 to enter low-power consumption mode, thermoelectric refrigerating unit 1 is turned off, and now supply current is about 2mA, the current mirror output terminal ITEC of described driving chip U1 is connected with the signal input part B1 of described ADC converter 10, the magnitude of voltage of ITEC output and the current value of thermoelectric refrigerating unit 1 are certain proportion, and fpga chip 5 can be understood the running status of thermoelectric refrigerating unit 1 in real time by the magnitude of voltage of monitoring ITEC output, the Current Control compensation end COMP of described driving chip U1 is by capacitor C 5 ground connection, after linking together, all drive current output terminal LX2 of described driving chip U1 are connected with one end of inductance L 2, the other end of described inductance L 2 and connect one end of decoupling capacitor C6 after be connected with Voltage-output induction end OS2, the other end ground connection of described decoupling capacitor C6, after linking together, all drive current output terminal LX1 of described driving chip U1 are connected with one end of inductance L 1, the other end of described inductance L 1 and connect one end of decoupling capacitor C7 after be connected with electric current output induction end CS, the other end ground connection of described decoupling capacitor C7, in the present embodiment, drive chip U1 need to coordinate small inductor to use, and the inductance of 3.3 μ H in most of the cases all meets the demands, in the time selecting inductance, the frequency response of noting LC is less than 1/5 of switching frequency, for example, the frequency in the loop of the electric capacity composition of the inductance of 3.3 μ H and 1 μ F is 87.6K, be less than 1/5 of 500K, meet the requirements.
In described laser bodies 3, behind the positive input terminal TEC+ of thermoelectric refrigerating unit 1 one end of connecting resistance R6, be connected with the Voltage-output induction end OS1 of described driving chip U1, the other end of described resistance R 6 is connected with the electric current output induction end CS of described driving chip U1, in described laser bodies 3, behind one end of the negative input end TEC-shunt-wound capacitance C8 of thermoelectric refrigerating unit 1, be connected with the Voltage-output induction end OS2 of described driving chip U1, the other end of described capacitor C 8 is connected with the electric current output induction end CS of described driving chip U1, the TH-of thermistor 2 end ground connection in described laser bodies 3, after the TH+ end series resistor R7 of thermistor 2, be connected with the reference voltage output terminal REF of described driving chip U1, in the present embodiment, the resistance of thermistor 2 changes along with the variation of temperature, utilize this characteristic, the temperature of thermistor 2 real-time detection laser internal die, and this temperature signal is passed to subtracter 7, subtracter 7 passes to PID controller 6 after processing again, after the processing of PID controller 6, draw control signal, this control signal input is driven to chip U1, drive the inner drive current that produces of chip U1 to pass to thermoelectric refrigerating unit 1 in laser bodies 3, thermoelectric refrigerating unit 1 according to the size and Orientation of drive current to heating or freezing, stablize the working temperature of laser instrument.
Described subtracter 7 comprises: operational amplifier U2, behind one end of the inverting input of described operational amplifier U2 connecting resistance R13, hold the line between resistance R 7 to be connected with the TH+ of described thermistor 2, after the in-phase input end series resistor R8 of described operational amplifier U2, be connected with the output terminal of operational amplifier U2, behind one end of the power end shunt-wound capacitance C9 of described operational amplifier U2, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 9 and operational amplifier U2, operational amplifier U2 in the present embodiment is mainly used in the temperature reference signal that temperature detection signal that thermistor 2 is transmitted and voltage follower 8 transmit and carries out the amplification of difference ratio, by the size of adjusting resistance R8, can change the multiple of amplification, the model of described operational amplifier U2 can be AD8551.
Described voltage follower 8 comprises: operational amplifier U3, the in-phase input end of described operational amplifier U3 is connected with the output terminal C1 of described DAC converter 9, behind one end of the inverting input of described operational amplifier U3 connecting resistance R9, be connected with the output terminal of operational amplifier U3, the other end of described resistance R 9 is connected with the in-phase input end of described operational amplifier U2, operational amplifier U3 in the present embodiment is mainly used in fpga chip 5 to play through the temperature reference signal of DAC converter 9 effect of isolation buffer, and the model of operational amplifier U3 can be AD8551.
Described PID controller 6 comprises: operational amplifier U4, the in-phase input end of described operational amplifier U4 is connected with the reference voltage output terminal REF of described driving chip U1, one end of the inverting input of described operational amplifier U4 connecting resistance R10, behind one end of one end of capacitor C 10 and capacitor C 11, be connected with one end of resistance R 11, behind one end of the other end of described resistance R 10 connecting resistance R12, be connected with the output terminal of described operational amplifier U2, the other end of described resistance R 12 is connected with the other end of described capacitor C 10, the other end of described resistance R 11 is connected with one end of capacitor C 12, after the other end of other end shunt-wound capacitance C11 of described capacitor C 12 and the output terminal of operational amplifier U4, be connected with the Current Control input end CTLI of described driving chip U1, behind one end of the power end shunt-wound capacitance C13 of described operational amplifier U4, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 13 and operational amplifier U4, the model of operational amplifier U4 in the present embodiment can be AD8551.
Described temperature monitoring circuit 11 comprises: operational amplifier U5, the in-phase input end of described operational amplifier U5 is connected with one end of described resistance R 13, the inverting input of described operational amplifier U5 and connect the output terminal of operational amplifier U5 after be connected with the signal input part B2 of described ADC converter 10, behind one end of the power end shunt-wound capacitance C14 of described operational amplifier U5, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 14 and operational amplifier U5, in the present embodiment, temperature signal that thermistor 2 transmits enters PID network by subtracter 7 on the one hand to carry out temperature and controls in real time, enter on the other hand temperature monitoring circuit 11, collect fpga chip 5 by ADC converter 10 and carry out temperature survey monitoring, the model of operational amplifier U5 in the present embodiment can be AD8552.
In the utility model, model is that the driving chip U1 of MAX1968 is the switch module driver for driving thermoelectric refrigerating unit 1, it has, and high integration, cost are low, efficiency advantages of higher, whole chip has adopted the mode of this Direct Current Control of pulse-length modulation (PWM), eliminate and driven the current surge in thermoelectric refrigerating unit 1, the FET of Embedded has reduced the use of external devices, increased work efficiency, the switching frequency of the 500KHz/1MHz that chip has and special ripple are eliminated machine-processed size and the noise that has reduced device, in whole temperature control system, fpga chip 5 has formed high precision in conjunction with DAC converter 9 and voltage follower 8, low noise reference temperature arranges circuit, PID controller 6 and subtracter 7 have formed high-precision analog control circuit, circuit is set above-mentioned reference temperature and analog control circuit combines the object that drives the Direct Current Control mode of chip U1 inside to reach higher temperature control accuracy, solve temperature controller in traditional laser instrument and be vulnerable to noise, lower so that the problem that can not satisfy the demands completely of temperature control precision, there is substantive distinguishing features and progress, by reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken possessing those of ordinary skill in the art, can also under the prerequisite that does not depart from the utility model aim, make various variations.

Claims (6)

1. the temperature control system of laser instrument in a laser on-line gas analysis instrument, comprise: inside is provided with the laser bodies (3) of thermoelectric refrigerating unit (1) and thermistor (2), it is characterized in that: described temperature control system also comprises: thermoelectric refrigerating unit driving circuit (4), fpga chip (5), PID controller (6), subtracter (7), voltage follower (8), DAC converter (9), ADC converter (10) and temperature monitoring circuit (11), described thermoelectric refrigerating unit driving circuit (4) respectively with fpga chip (5), PID controller (6) is connected with laser bodies (3), described subtracter (7) respectively with PID controller (6), voltage follower (8) is connected with laser bodies (3), described voltage follower (8) is connected with fpga chip (5) by DAC converter (9), described fpga chip (5) is also connected with temperature monitoring circuit (11) with thermoelectric refrigerating unit driving circuit (4) respectively by ADC converter (10), described temperature monitoring circuit (11) is connected with laser bodies (3).
2. the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument according to claim 1, it is characterized in that: described thermoelectric refrigerating unit driving circuit (4) comprising: the driving chip U1 that model is MAX1968, the analog power input end VDD of described driving chip U1 also meets all power input PVDD1 and is connected with+3.3V voltage after all power input PVDD2, the switching frequency selecting side FREQ ground connection of described driving chip U1, the analog power input end VDD of described driving chip U1 and in analog between be provided with filter capacitor C1, hold all power input PVDD1 that link together of described driving chip U1 and all powers that link together and between PGND1, be provided with filter capacitor C2, hold all power input PVDD2 that link together of described driving chip U1 and all powers that link together and between PGND2, be provided with filter capacitor C3, the reference voltage output terminal REF of described driving chip U1 and connect one end of filter capacitor C4 and one end of resistance R 1 after be connected with one end of resistance R 2, the other end ground connection of described filter capacitor C4, ground connection after the other end series resistor R3 of described resistance R 1, ground connection after the other end series resistor R4 of described resistance R 2, the maximum forward current value end MAXIP of described driving chip U1 is connected with reference voltage output terminal REF, the maximum reverse current end MAXIN of described driving chip U1 is connected with the line between resistance R 1 and resistance R 3, the maximum voltage end MAXV of described driving chip U1 is connected with the line between resistance R 2 and resistance R 4, the EP end of described driving chip U1 is connected with holding in analog GND, behind the shutoff control input end SHEN# of described driving chip U1 one end of connecting resistance R5, be connected with the control signal output terminals A 1 of described fpga chip (5), the other end ground connection of described resistance R 5, the current mirror output terminal ITEC of described driving chip U1 is connected with the signal input part B1 of described ADC converter (10), the Current Control compensation end COMP of described driving chip U1 is by capacitor C 5 ground connection, after linking together, all drive current output terminal LX2 of described driving chip U1 are connected with one end of inductance L 2, the other end of described inductance L 2 and connect one end of decoupling capacitor C6 after be connected with Voltage-output induction end OS2, the other end ground connection of described decoupling capacitor C6, after linking together, all drive current output terminal LX1 of described driving chip U1 are connected with one end of inductance L 1, the other end of described inductance L 1 and connect one end of decoupling capacitor C7 after be connected with electric current output induction end CS, the other end ground connection of described decoupling capacitor C7,
In described laser bodies (3), behind the positive input terminal TEC+ of thermoelectric refrigerating unit (1) one end of connecting resistance R6, be connected with the Voltage-output induction end OS1 of described driving chip U1, the other end of described resistance R 6 is connected with the electric current output induction end CS of described driving chip U1, in described laser bodies (3), behind one end of the negative input end TEC-shunt-wound capacitance C8 of thermoelectric refrigerating unit (1), be connected with the Voltage-output induction end OS2 of described driving chip U1, the other end of described capacitor C 8 is connected with the electric current output induction end CS of described driving chip U1, the TH-of thermistor (2) end ground connection in described laser bodies (3), after the TH+ end series resistor R7 of thermistor (2), be connected with the reference voltage output terminal REF of described driving chip U1,
Described subtracter (7) comprising: operational amplifier U2, behind one end of the inverting input of described operational amplifier U2 connecting resistance R13, hold the line between resistance R 7 to be connected with the TH+ of described thermistor (2), after the in-phase input end series resistor R8 of described operational amplifier U2, be connected with the output terminal of operational amplifier U2, behind one end of the power end shunt-wound capacitance C9 of described operational amplifier U2, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 9 and operational amplifier U2;
Described voltage follower (8) comprising: operational amplifier U3, the in-phase input end of described operational amplifier U3 is connected with the output terminal C1 of described DAC converter (9), behind one end of the inverting input of described operational amplifier U3 connecting resistance R9, be connected with the output terminal of operational amplifier U3, the other end of described resistance R 9 is connected with the in-phase input end of described operational amplifier U2;
Described PID controller (6) comprising: operational amplifier U4, the in-phase input end of described operational amplifier U4 is connected with the reference voltage output terminal REF of described driving chip U1, one end of the inverting input of described operational amplifier U4 connecting resistance R10, behind one end of one end of capacitor C 10 and capacitor C 11, be connected with one end of resistance R 11, behind one end of the other end of described resistance R 10 connecting resistance R12, be connected with the output terminal of described operational amplifier U2, the other end of described resistance R 12 is connected with the other end of described capacitor C 10, the other end of described resistance R 11 is connected with one end of capacitor C 12, after the other end of other end shunt-wound capacitance C11 of described capacitor C 12 and the output terminal of operational amplifier U4, be connected with the Current Control input end CTLI of described driving chip U1, behind one end of the power end shunt-wound capacitance C13 of described operational amplifier U4, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 13 and operational amplifier U4,
Described temperature monitoring circuit (11) comprising: operational amplifier U5, the in-phase input end of described operational amplifier U5 is connected with one end of described resistance R 13, the inverting input of described operational amplifier U5 and connect the output terminal of operational amplifier U5 after be connected with the signal input part B2 of described ADC converter (10), behind one end of the power end shunt-wound capacitance C14 of described operational amplifier U5, be connected with+5V voltage, the equal ground connection of earth terminal of the other end of described capacitor C 14 and operational amplifier U5.
3. the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument according to claim 2, is characterized in that: the model of described operational amplifier U2 is AD8551.
4. the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument according to claim 2, is characterized in that: the model of described operational amplifier U3 is AD8551.
5. the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument according to claim 2, is characterized in that: the model of described operational amplifier U4 is AD8551.
6. the temperature control system of laser instrument in a kind of laser on-line gas analysis instrument according to claim 2, is characterized in that: the model of described operational amplifier U5 is AD8552.
CN201420461913.9U 2014-08-16 2014-08-16 The temperature control system of laser instrument in a kind of laser on-line gas analysis instrument Expired - Fee Related CN204009625U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104181953A (en) * 2014-08-16 2014-12-03 山西森达源科技有限公司 Temperature control system of laser device in laser online gas analyzer
CN105045308A (en) * 2015-08-12 2015-11-11 北京空间机电研究所 Semiconductor refrigerator closed-loop control method applied to space environment
CN105373157A (en) * 2015-12-09 2016-03-02 无锡路通视信网络股份有限公司 PWM-based TEC driving circuit and method for improving driving ability of driving circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104181953A (en) * 2014-08-16 2014-12-03 山西森达源科技有限公司 Temperature control system of laser device in laser online gas analyzer
CN105045308A (en) * 2015-08-12 2015-11-11 北京空间机电研究所 Semiconductor refrigerator closed-loop control method applied to space environment
CN105373157A (en) * 2015-12-09 2016-03-02 无锡路通视信网络股份有限公司 PWM-based TEC driving circuit and method for improving driving ability of driving circuit
CN105373157B (en) * 2015-12-09 2018-01-30 无锡路通视信网络股份有限公司 A kind of TEC drive circuits based on PWM and the method for improving its driving force

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