CN102541117B - Multipath temperature control device for ion mobility spectrometer - Google Patents
Multipath temperature control device for ion mobility spectrometer Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims abstract description 23
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- 230000004069 differentiation Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 34
- 230000005012 migration Effects 0.000 claims description 22
- 238000013508 migration Methods 0.000 claims description 22
- 238000009791 electrochemical migration reaction Methods 0.000 claims description 21
- 230000003750 conditioning effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
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- 238000005516 engineering process Methods 0.000 description 1
- 238000001871 ion mobility spectroscopy Methods 0.000 description 1
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Abstract
The invention discloses a multipath temperature control device for an ion mobility spectrometer. The device comprises a digital circuit part and an analog circuit part, wherein the digital circuit part mainly comprises a singlechip with a universal serial bus (USB) interface, a digital-to-analog converter (DAC) with multiple paths of independent output and an analog-to-digital converter with a single path of analog input; the analog circuit part comprises a plurality of independent temperature control circuits and a one-out-multiple analog switching circuit; and each temperature control circuit comprises a corresponding PT1000 temperature sensor, an analog proportion integration differentiation (PID) control circuit, a metal oxide semiconductor (MOS) tube and a heating film. According to the embodiment of the invention, the temperature control circuits can work simultaneously and are independent of one another.
Description
Technical field
The present invention relates to the temperature control in ionic migration spectrometer, be specifically related to a kind of multi way temperature control device for ionic migration spectrometer.
Background technology
In ionic migration spectrometer, migration tube is core component, is operated under atmospheric pressure, and the kind of its working temperature on ion mobility, reactant ion and output etc. have very large impact.Select suitable migration tube working temperature, can effectively increase the output of reactant ion, be conducive to improve the resolution that ionic migration spectrometer detects, improve the sensitivity and the selectivity that detect.
In ionic migration spectrometer, the working temperature of migration tube has material impact to its serviceability.Therefore, to temperature, control has higher requirement to ionic migration spectrometer.The working temperature of General Requirements migration tube can be set between 80 ℃ to 300 ℃, and during constant temperature, precision is ± 1 ℃, and stability also requires in ± 1 ℃.In addition, migration tube output be about tens to fly the faint charge signal of storehouse (femtocoulomb) level, be easy to be subject to the interference of external electromagnetic signal.Therefore, temperature control circuit can not produce and disturb migration tube output signal in the course of the work.
In ionic migration spectrometer, not only migration tube need to carry out temperature control, also has the parts such as injector also to need to carry out temperature control.Therefore, in ionic migration spectrometer, require to realize multi way temperature control, and the temperature control of each road is separate, is independent of each other simultaneously.
In industry at present, conventional temperature control circuit is mostly by the voltage on heater element, to carry out break-make control to realize, as adopted pulse width modulation (PWM) to realize control.Although this control circuit and algorithm are simple, it adopts square-wave pulse to be used as controlling and heating, and the rise and fall of pulse signal are easy to migration tube output signal to produce and disturb along saltus step.
In addition, apply in addition that traditional analog PID controls and Digital PID Algorithm is realized temperature control.Traditional analog PID temperature-control circuit is also mostly finally to drive the break-make mode of similar relay etc. to realize temperature control.Digital PID Algorithm is more complicated comparatively speaking.Carrying out take single-chip microcomputer as core in the ion mobility spectrometry instrument system of system Control & data acquisition, the PID calculating in temperature control process can take too much mcu resource, mcu resource anxiety while causing Real-time Collection spectrometer data.
Summary of the invention
The object of the invention is the defect existing when above-mentioned prior art is applied to the ionic migration spectrometer take single-chip microcomputer as Control & data acquisition core in order to overcome, the Multipath temperature control device that provides a kind of ionic migration spectrometer to use.
In one aspect of the invention, proposed a kind of Multi-path temperature control device for ion migration spectrometer, comprised digital circuit part and artificial circuit part, wherein digital circuit part comprises: single-chip microcomputer; Be connected and have with described single-chip microcomputer the digital to analog converter DAC that multichannel is independently exported; Be connected and have the analog to digital converter ADC of single channel analog input with described single-chip microcomputer; Artificial circuit part comprises independently control circuit part and multiselect one switch of multichannel, and each control circuit part comprises: the resistance bridge that the corresponding output in independently being exported by the described multichannel that is arranged on temperature sensor on ionic migration spectrometer and described DAC etc. forms; The proportion integration differentiation PID control circuit being connected with one of described resistance bridge output; Export with another road of described resistance bridge multiselect one switch being connected; Export with described multiselect one switch the described ADC being connected; Under the output signal control of described PID control circuit, drive the driver that is arranged on the heating unit on ionic migration spectrometer.
According to embodiments of the invention, described temperature sensor is as an arm resistance of resistance bridge, and the deviation signal producing by resistance bridge outputs to described PID control circuit after amplifying.
According to embodiments of the invention, described heating unit is heating film, and the electric current that flows through heating unit by driver control carries out temperature adjusting.
According to embodiments of the invention, described driver is metal-oxide-semiconductor, described PID control circuit output voltage control amount is input to the grid of described metal-oxide-semiconductor, utilize metal-oxide-semiconductor drain current with the characteristic that between grid and source electrode, reverse voltage changes, change and realize temperature control by the electric current of heating film.
According to embodiments of the invention, the constant temperature point that needs to carry out temperature controlled position on described ionic migration spectrometer is that the computing machine by being connected with described single-chip microcomputer arranges.
According to embodiments of the invention, described single-chip microcomputer carries general-purpose serial bus USB interface, and is connected with described computing machine by this USB interface.
According to embodiments of the invention, described PID control circuit comprises: ratio control unit, comprise the first operational amplifier, the first resistor, the second resistor and the 3rd resistor, wherein said the first operational amplifier has normal phase input end, inverting input and output terminal, one end of the first resistor receives temperature control signals, the other end connects one end of the second resistor, the other end of the second resistor connects the output terminal of the first operational amplifier, the normal phase input end of the first operational amplifier connects the first bias voltage, inverting input connects the node between the first resistor and the second resistor, one end of the 3rd resistor connects the output terminal of the first operational amplifier, the temperature control signals that other end output regulates through ratio, integration control unit, comprise the second operational amplifier, the 4th resistor, the 5th resistor, the 6th resistor, the 7th resistor and the first capacitor, one end of described the 4th resistor receives described temperature control signals, the other end is connected to the two one end of the 5th resistor and the 6th resistor, the other end of the 5th resistor is connected to the normal phase input end of the second operation amplifier, and this normal phase input end connects the second bias voltage, the inverting input of another termination the second operational amplifier of the 6th resistor and one end of the first capacitor, the output terminal of another termination the second operational amplifier of the first capacitor and one end of the 7th resistor, the other end output of the 7th resistor is through the temperature control signals of integral adjustment, differential control module, comprise the 3rd operational amplifier, the 8th resistor, the 9th resistor, the tenth resistor, the 11 resistor and the 12 resistor and the second capacitor, one end of the 8th resistor receives described temperature control signals, the other end connects one end of the 9th resistor and one end of the second capacitor, the normal phase input end of another termination the 3rd operational amplifier of the 9th resistor, and this normal phase input end connects the 3rd bias voltage, one end of another termination the tenth resistor of the second capacitor, another termination the 3rd inverting input of operational amplifier and one end of the 11 resistor of the tenth resistor, another termination the 3rd output terminal of operational amplifier and one end of the 12 resistor of the 11 resistor, the temperature control signals that the other end output of the 12 resistor regulates through differential, linear sums circuit, comprise four-operational amplifier, the 13 resistor and the 3rd capacitor, the inverting input of four-operational amplifier receives from the described ratio control unit of process, described temperature control signals after described integration control unit and described differential control module regulate, the normal phase input end of four-operational amplifier connects the 4th bias voltage, described the 13 resistor and described the 3rd Parallel-connected Capacitor are between the inverting input and output terminal of described four-operational amplifier, and from the output terminal of described four-operational amplifier, the temperature control signals summation is outputed to the control end of driver.
According to embodiments of the invention, described PID control circuit also comprises: signal condition unit, the signal of the deviation between temperature and the constant temperature point of setting that his-and-hers watches temp. displaying function sensor detects amplifies, and carry out with bias voltage and differ from conditioning, output to ratio control unit, integration control unit and differential control module.
According to embodiments of the invention, described signal condition unit comprises the 5th operational amplifier, the 14 resistor, the 15 resistor, the 16 resistor and the 4th capacitor, described the 14 resistor one end receives temperature difference signal, the normal phase input end of another termination the 5th operational amplifier, and this normal phase input end is by the 4th capacitor grounding, described the 15 resistor one end receives the 5th bias voltage, the inverting input of another termination the 5th operational amplifier, the 16 resistor is connected in parallel between the inverting input and output terminal of described the 5th operational amplifier.
According to embodiments of the invention, multi-path temperature-control circuit can be worked simultaneously, separate again.
In addition, the constant temperature of each temperature control circuit point can arrange flexibly and adjustment, wide, the each road of adjustable extent can constant temperature in different temperature points.
In addition,, according to embodiments of the invention, after PID control circuit, the controlled quentity controlled variable of generation is a voltage signal slowly changing.Adopt metal-oxide-semiconductor as controlling output unit, final what control is the size of current by heating film, rather than the break-make of voltage on heating film, thereby has greatly reduced the interference to ionic migration spectrometer signal.
In addition, according to embodiments of the invention, in temperature control process, except the arranging of constant temperature point, do not need the intervention of single-chip microcomputer, saved the limited resource of single-chip microcomputer.
In addition, according to embodiments of the invention, use the single-chip microcomputer with USB interface, during with computer communication, have advantages of that connection is simple, easy to use.
Accompanying drawing explanation
In detailed description below in conjunction with accompanying drawing, above-mentioned feature and advantage of the present invention will be more obvious, wherein:
Fig. 1 is according to the schematic block diagram of the temperature control system of the embodiment of the present invention;
Fig. 2 is according to the schematic circuit of the PID control circuit of the embodiment of the present invention.
Embodiment
With reference to accompanying drawing, describe the preferred embodiment of the present invention in detail below.In the accompanying drawings, although be shown in different accompanying drawings, identical Reference numeral is for representing identical or similar assembly.For clarity and conciseness, the detailed description that is included in the known function and structure here will be omitted, otherwise they will make theme of the present invention unclear.
Following examples are used for illustrating the present invention, but not are used for limiting the scope of the invention.Fig. 1 is according to the schematic block diagram of the temperature control system of the embodiment of the present invention.
According to the ionic migration spectrometer of the embodiment of the present invention, with multi-path temperature-control circuit 100, comprise digital circuit part and artificial circuit part.
According to embodiments of the invention, digital circuit part mainly comprises the single-chip microcomputer 110 with usb 1 11, DAC 120, the ADC 190 with single channel analog input that has multichannel independently to export.
According to embodiments of the invention, artificial circuit part comprises independently temperature-control circuit 130,140,150 and 160 and multiselect 1 analog switching circuit 180 of multichannel.
Take temperature-control circuit 130 as example, it comprises the corresponding resistance bridge 131, simulation control of PID circuit 132, metal-oxide-semiconductor 133 and the heating film 134 that temperature sensor PT100 0 grade, consist of.
According to the temperature control equipment of the embodiment of the present invention, adopt negative feedback closed loop control.Heating film 134 heating units as parts such as migration tubes.The sample temperature of the parts such as migration tube of temperature sensor PT100 0, while is as an arm resistance of resistance bridge 131, the deviation signal producing by resistance bridge 131 is as the input of PID control circuit 132, after PID control circuit regulates, export the grid that a voltage control quantity is input to metal-oxide-semiconductor 133, utilize metal-oxide-semiconductor 133 drain currents with characteristic that between grid and source electrode, reverse voltage changes, change by the electric current of heating film 134 and realize temperature control, thereby form real-time closed-loop control system.
According to embodiments of the invention, in heating and thermostatic process, except arranging constant temperature point, no longer need the intervention of single-chip microcomputer, by hardware circuit, automatically completed completely.
According to embodiments of the invention, the analog switch 180 of a multiselect 1 is set in attemperating unit and there is the ADC 190 of single channel analog input, be used for monitoring the state of temperature that migration tube etc. needs heater block.
As shown in Figure 1,4 road temperature-control circuits 130,140,150 and 160 in one embodiment of the invention, have been adopted.
Referring to Fig. 1, in dotted line frame, for realizing the device 100 of the embodiment of the present invention, it comprises digital circuit part and artificial circuit part.Digital circuit part comprises the single-chip microcomputer 110 with usb 1 11, DAC 120, the ADC 190 with single channel analog input that has 4 tunnels independently to export.Artificial circuit part comprises that the parallel independently temperature-control circuit 130,140,150 and 160,4 in 4 tunnels selects 1 analog switching circuit 180 and the large power supply 170 for heating film power supply.Every road temperature-control circuit comprises resistance bridge 131 and corresponding simulation control of PID circuit 132, metal-oxide-semiconductor circuit 133 and heating film 134 as 130.
When the temperature control circuit of ionic migration spectrometer is worked, first according to actual conditions, utilize computing machine 200 to single-chip microcomputer 110, to send the required constant temperature point data of the each parts of ionic migration spectrometer by USB interface 210, allow single-chip microcomputer 110 set the 4 tunnel output analog voltage signals of DAC 120, this magnitude of voltage equals the voltage drop value of PT1000 in bleeder circuit under preferred temperature, this magnitude of voltage and the equivalence of PT1000 bleeder circuit form four arms of resistance bridge 131, the voltage drop value of this magnitude of voltage and temperature sensor PT100 0 reality compares and produces an error signal and amplify by instrumentation amplifier, after PID control circuit 132, produce the grid that a voltage control quantity is input to metal-oxide-semiconductor 133, the drain current of metal-oxide-semiconductor 133 changes thereupon like this, thereby also change by the electric current of heating film 134, realize the real-time closed-loop control of temperature.
If need to monitor the current temperature regime of ionic migration spectrometer each several part, can be input to ADC190 by 4 error signals of selecting 1 analog switch 180 to select the resistance bridge that need to monitor branch road to produce, utilize single-chip microcomputer 110 to gather the conversion Output rusults of ADC 190, the simple conversion of process can obtain the temperature value of institute monitoring point.
Fig. 2 is according to the schematic circuit of the attemperating unit of the embodiment of the present invention.
As shown in Figure 2, resistance bridge unit 131 comprises instrumentation amplifier U1-INA333, operational amplifier U2, resistor R1, resistor R2, resistor R3, capacitor C1, capacitor C2, temperature sensor PT100 0.Utilize the adjustable instrumentation amplifier U1 of gain, suitable gain is set, the error signal that the voltage drop value of the output voltage values to DAC 120 and temperature sensor PT100 0 relatively produces is amplified, and follow by operational amplifier U2, then divide two-way output, wherein a road output is connected to proportion integration differentiation PID control circuit 132, and another road output is connected to 4 and selects 1 circuit 180.
Resistor R1 mono-termination 1.8V stabilized voltage supply, the other end is connected to one end of inverting input and the temperature sensor PT100 0 of instrumentation amplifier U1, the other end ground connection of temperature sensor PT100 0.DAC 120 mono-tunnel output is connected to the normal phase input end of instrumentation amplifier U1.By resistor R1 and temperature sensor PT100 0, formed two brachium pontis of resistance bridge, another two brachium pontis by the output equivalent of DAC 120 it.The gain resistor R2 two ends that instrumentation amplifier U1 gain is set are connected respectively to the 1st and the 8th pin of instrumentation amplifier U1.The reference voltage end of instrumentation amplifier U1 is connected with bias voltage Vbias.One end of resistor R3 is connected to the output terminal of instrumentation amplifier U1, and the other end is connected to the positive input of operational amplifier U2, and the inverting input of operational amplifier U2 is connected with its output terminal, forms signal follow circuit.Decoupling capacitance device C1 one end is connected with the working power of instrumentation amplifier U1, other end ground connection.Filter capacitor C2 one end is connected with bias voltage Vbias, other end ground connection.
As shown in Figure 2, error signal conditioning unit 1321 comprises operational amplifier U3, resistor R4, resistor R5, resistor R6, capacitor C3, for the difference signal after resistance bridge unit 131 amplifies being carried out and differing from conditioning, exports the signal after conditioning.
Resistor R4 one end receives from the signal of resistance bridge unit 131, and its other end is connected to the normal phase input end of operational amplifier U3, and this normal phase input end is by capacitor C3 ground connection.In addition, one end of resistor R5 receives bias voltage Vbias, the inverting input of other end concatenation operation amplifier U3 and one end of another resistor R6, and resistor R6 is connected in parallel between the inverting input and output terminal of operational amplifier U3.The signal that error signal conditioning unit 1321 is exported is connected to ratio control unit 1322, integration control unit 1323 and differential control module 1324.
Ratio (P) control module 1322 comprises operational amplifier U4, resistor R7, resistor R8, resistor R9, the proportional relation of the output of this ratio control unit and input signal.
One end of resistor R7 receives the signal from error signal conditioning unit 1321, the inverting input of other end concatenation operation amplifier U4 and one end of resistor R8, resistor R8 is connected in parallel between the inverting input and output terminal of operational amplifier U4, the output terminal of one end concatenation operation amplifier U4 of resistor R9, the other end is as the output terminal of ratio control unit 1322, and output is through the temperature control signals of ratio adjusting.In addition, at the normal phase input end of operational amplifier U4, meet a bias voltage Vbias.
Integration (I) control module 1323 comprises operational amplifier U5, resistor R10, resistor R11, resistor R12, resistor R13, capacitor C4, the output of this integration control unit and input signal be integrated into proportionate relationship.
One end of resistor R10 receives the signal from error signal conditioning unit 1321, the other end is connected with one end of resistor R11 and R12, the normal phase input end of the other end concatenation operation amplifier U5 of resistor R11, this normal phase input end meets a bias voltage Vbias equally.The inverting input of the other end concatenation operation amplifier of resistor R12 and capacitor C4 one end, the output terminal of the other end concatenation operation amplifier U5 of capacitor C 4, the output terminal of one end concatenation operation amplifier U5 of resistor R13, other end output is through the temperature control signals of integral adjustment.
Differential (D) control module 1324 comprises operational amplifier U6, resistor R14, resistor R15, resistor R16, resistor R17, resistor R18, capacitor C5, the output of differential control module and the proportional relation of the differential of input signal.
One end of resistor R14 receives the signal from error signal conditioning unit 1321, one end of other end contact resistance device R15 and capacitor C5.The normal phase input end of another termination operational amplifier U6 of resistor R15, and this normal phase input end meets a bias voltage Vbias.One end of the other end contact resistance device R16 of capacitor C5, the inverting input of the other end concatenation operation amplifier U6 of resistor R16, resistor R17 is connected in parallel between the inverting input and output terminal of operational amplifier U6, the output terminal of one end concatenation operation amplifier U6 of resistor R18, the temperature control signals of other end output after differential regulates.
The temperature control signals of exporting from ratio control unit 1322, integration control unit 1323 and differential control module 1324 is sued for peace in linear sum unit 1325, then outputs to metal-oxide-semiconductor Q1 heating film is controlled.
The two is connected in parallel resistor R19 and capacitor C6 between the inverting input and output terminal of operational amplifier U7, and the normal phase input end of operational amplifier U7 meets a bias voltage Vbias.
In the each control module of PID, the positive input of operational amplifier U4, U5, U6, U7 is general ground connection in traditional PID control circuit, but what connect in embodiments of the present invention is a positive bias voltage, like this when Selecting operation amplifier, select the operational amplifier of single power supply to meet the demands, reduce like this requirement to power supply, simplified the wiring of circuit simultaneously, obtained good effect.
In addition, in linear sum unit 1325, utilize capacitor C6 to form voltage parallel negative-feedback circuit, operational amplifier is carried out to phase compensation, be used for preventing that operational amplifier from producing self-excitation.
Description is above only for realizing embodiments of the present invention; it should be appreciated by those skilled in the art; the any modification or partial replacement not departing from the scope of the present invention; all should belong to the scope that claim of the present invention limits; therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (9)
1. a Multi-path temperature control device for ion migration spectrometer, comprises digital circuit part and artificial circuit part, and wherein digital circuit part comprises: single-chip microcomputer; The digital to analog converter DAC being connected with described single-chip microcomputer; With the analog to digital converter ADC that is connected and has single channel analog input with described single-chip microcomputer;
It is characterized in that, described digital to analog converter DAC has multichannel and independently exports,
Artificial circuit part comprises independently control circuit part and multiselect one switch of multichannel, and wherein each control circuit part comprises:
Be arranged on the temperature sensor on ionic migration spectrometer;
The resistance bridge forming is exported on a corresponding road in independently being exported by the described multichannel of described temperature sensor and described DAC, from described resistance bridge, signal divides two-way output, wherein a road output is connected to proportion integration differentiation PID control circuit, and another road output is connected to described ADC through described multiselect one switch;
Under the output signal control of described PID control circuit, drive the driver that is arranged on the heating unit on ionic migration spectrometer.
2. Multi-path temperature control device for ion migration spectrometer as claimed in claim 1, it is characterized in that, described temperature sensor is as an arm resistance of resistance bridge, and the deviation signal producing by resistance bridge outputs to described PID control circuit after amplifying.
3. Multi-path temperature control device for ion migration spectrometer as claimed in claim 1, is characterized in that, described heating unit is heating film, and the electric current that flows through heating unit by driver control carries out temperature adjusting.
4. Multi-path temperature control device for ion migration spectrometer as claimed in claim 3, it is characterized in that, described driver is metal-oxide-semiconductor, described PID control circuit output voltage control amount is input to the grid of described metal-oxide-semiconductor, utilize metal-oxide-semiconductor drain current with the characteristic that between grid and source electrode, reverse voltage changes, change and realize temperature control by the electric current of heating film.
5. Multi-path temperature control device for ion migration spectrometer as claimed in claim 1, is characterized in that, the constant temperature point that needs to carry out temperature controlled position on described ionic migration spectrometer is that the computing machine by being connected with described single-chip microcomputer arranges.
6. Multi-path temperature control device for ion migration spectrometer as claimed in claim 5, is characterized in that, described single-chip microcomputer carries general-purpose serial bus USB interface, and is connected with described computing machine by this USB interface.
7. Multi-path temperature control device for ion migration spectrometer as claimed in claim 1, is characterized in that, described PID control circuit comprises:
Ratio control unit, comprise the first operational amplifier, the first resistor, the second resistor and the 3rd resistor, wherein said the first operational amplifier has normal phase input end, inverting input and output terminal, one end of the first resistor receives temperature control signals, the other end connects one end of the second resistor, the other end of the second resistor connects the output terminal of the first operational amplifier, the normal phase input end of the first operational amplifier connects the first bias voltage, inverting input connects the node between the first resistor and the second resistor, one end of the 3rd resistor connects the output terminal of the first operational amplifier, the temperature control signals that other end output regulates through ratio,
Integration control unit, comprise the second operational amplifier, the 4th resistor, the 5th resistor, the 6th resistor, the 7th resistor and the first capacitor, one end of described the 4th resistor receives described temperature control signals, the other end is connected to the two one end of the 5th resistor and the 6th resistor, the other end of the 5th resistor is connected to the normal phase input end of the second operation amplifier, and this normal phase input end connects the second bias voltage, the inverting input of another termination the second operational amplifier of the 6th resistor and one end of the first capacitor, the output terminal of another termination the second operational amplifier of the first capacitor and one end of the 7th resistor, the other end output of the 7th resistor is through the temperature control signals of integral adjustment,
Differential control module, comprise the 3rd operational amplifier, the 8th resistor, the 9th resistor, the tenth resistor, the 11 resistor and the 12 resistor and the second capacitor, one end of the 8th resistor receives described temperature control signals, the other end connects one end of the 9th resistor and one end of the second capacitor, the normal phase input end of another termination the 3rd operational amplifier of the 9th resistor, and this normal phase input end connects the 3rd bias voltage, one end of another termination the tenth resistor of the second capacitor, another termination the 3rd inverting input of operational amplifier and one end of the 11 resistor of the tenth resistor, another termination the 3rd output terminal of operational amplifier and one end of the 12 resistor of the 11 resistor, the temperature control signals that the other end output of the 12 resistor regulates through differential,
Linear sums circuit, comprise four-operational amplifier, the 13 resistor and the 3rd capacitor, the inverting input of four-operational amplifier receives from the described ratio control unit of process, described temperature control signals after described integration control unit and described differential control module regulate, the normal phase input end of four-operational amplifier connects the 4th bias voltage, described the 13 resistor and described the 3rd Parallel-connected Capacitor are between the inverting input and output terminal of described four-operational amplifier, and from the output terminal of described four-operational amplifier, the temperature control signals summation is outputed to the control end of driver.
8. Multi-path temperature control device for ion migration spectrometer as claimed in claim 7, is characterized in that, described PID control circuit also comprises:
Signal condition unit, the signal of the deviation between temperature and the constant temperature point of setting that his-and-hers watches temp. displaying function sensor detects amplifies, and carries out with bias voltage and differ from conditioning, outputs to ratio control unit, integration control unit and differential control module.
9. Multi-path temperature control device for ion migration spectrometer as claimed in claim 8, it is characterized in that, described signal condition unit comprises the 5th operational amplifier, the 14 resistor, the 15 resistor, the 16 resistor and the 4th capacitor, described the 14 resistor one end receives temperature difference signal, the normal phase input end of another termination the 5th operational amplifier, and this normal phase input end is by the 4th capacitor grounding, described the 15 resistor one end receives the 5th bias voltage, the inverting input of another termination the 5th operational amplifier, the 16 resistor is connected in parallel between the inverting input and output terminal of described the 5th operational amplifier.
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| CN201010624248.7A CN102541117B (en) | 2010-12-31 | 2010-12-31 | Multipath temperature control device for ion mobility spectrometer |
| HK12113012.3A HK1172103A1 (en) | 2010-12-31 | 2012-12-17 | Multipath temperature control device for ion mobility spectrometer |
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| CN102880204B (en) * | 2012-09-21 | 2015-08-12 | 中国船舶重工集团公司第七0七研究所 | A kind of digital temperature control system based on large dead time controlled device |
| CN103887140A (en) * | 2012-12-19 | 2014-06-25 | 中国科学院大连化学物理研究所 | Ion mobility spectrometer |
| CN104460758B (en) * | 2014-10-20 | 2016-11-16 | 上海电机学院 | A kind of embedded temperature controller with parallel connection input fault tolerance |
| CN109980926B (en) * | 2019-04-30 | 2024-05-14 | 苏州易美新思新能源科技有限公司 | Multichannel serial power supply |
| CN111060741A (en) * | 2020-01-08 | 2020-04-24 | 广东达诚技术股份有限公司 | Multi-channel temperature control heating current detection system |
| CN113155941A (en) * | 2021-03-22 | 2021-07-23 | 西北大学 | Data acquisition system based on ion mobility spectrometry |
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| US20040102874A1 (en) * | 2002-11-27 | 2004-05-27 | Crosby Philip S. | Method and apparatus for controlling an optical transponder |
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| HK1172103A1 (en) | 2013-04-12 |
| CN102541117A (en) | 2012-07-04 |
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