CN102735362B - Astronautic programmable thermocouple temperature transmitter - Google Patents
Astronautic programmable thermocouple temperature transmitter Download PDFInfo
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- CN102735362B CN102735362B CN201210219129.2A CN201210219129A CN102735362B CN 102735362 B CN102735362 B CN 102735362B CN 201210219129 A CN201210219129 A CN 201210219129A CN 102735362 B CN102735362 B CN 102735362B
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Abstract
The invention relates to an astronautic programmable thermocouple temperature transmitter. A circuit part is composed of a power circuit, a programmable amplifying circuit, a programmable cold junction compensation circuit, an operation amplifying circuit and an output protecting circuit, wherein the functions of power filtering, reverse connection protection, transient impact protection, and the like, are achieved by the power circuit; a thermocouple signal is adjusted to be in a suitable voltage range by the programmable amplifying circuit; the programmable cold junction compensation circuit is used for sensing the temperature of a cold junction of the thermocouple, converting a temperature signal of the cold junction into a voltage signal and compensating the temperature of the cold junction of the thermocouple; output signals of the programmable amplifying circuit and the programmable cold junction compensation circuit are operated and amplified to be 0-5V by the operation amplifying circuit; and the output protecting circuit is used for limiting an output voltage within a scope of -0.5V to +6.5V and protecting a next-stage system from being damaged when the circuit is in fault. The astronautic programmable thermocouple temperature transmitter has the advantages of high intelligent degree, adjustable range, no requirement for hardware debugging, suitability for batch production and suitability for thermocouples of K type, E type, T type and tungsten rhenium type.
Description
Technical field
The present invention relates to a kind of space flight thermocouple temperature transmitter able to programme, belong to electromechanical integration field.
Background technology
Temperature is the important measurement parameter in carrying space and weapon model, and thermopair is one of thermometric cardinal principle, and wherein K type, E type, T-shaped and tungsten rhenium type account for the more than 98% of thermopair product.Single-shot delivery and weapon model matched with hot galvanic couple quantity can reach tens, even approach hundred, and temperature range ability can reach tens of kinds.Along with the high density mission need of carrying space and weapon model, the supporting quantity sharp increase of thermocouple temperature transmitter, has proposed requirement intelligent, batch production to it.
Current version is difficult to meet above-mentioned requirements by thermocouple temperature transmitter, is mainly manifested in:
1) range ability of existing product relies on the resistance of internal resistance to regulate, and the hardware of same series of products is inconsistent, and production efficiency is lower, inadaptable batch production;
2) existing product, due to the difference of components and parts, needs hardware debug, and debug process is loaded down with trivial details;
3) after existing product has assembled, range cannot be changed, and intelligent degree is low.
The novel space flight thermocouple temperature transmitter of therefore, be badly in need of that a kind of intelligent degree is high, range is adjustable, exempt from hardware debug, suitable batch being produced.
Summary of the invention
The object of the invention is to overcome the above-mentioned deficiency of prior art, provide a kind of space flight thermocouple temperature transmitter able to programme, the intelligent degree of this transmitter is high, range is adjustable, exempt from hardware debug, suitable batch is produced, and is applicable to the thermopairs such as K type, E type, T-shaped and tungsten rhenium type.
Above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A space flight thermocouple temperature transmitter able to programme, comprises cold junction compensation circuit able to programme, pga circuit, operational amplification circuit, output protection circuit and power circuit, wherein:
Pga circuit: after transmitter has assembled by zero-bit and the enlargement factor of outside test program frock debug circuit, thermocouple signal is adjusted to 0.2V～4.8V voltage range, and voltage signal is exported to operational amplification circuit, after online programming debugging is qualified, zero-bit and enlargement factor are fixed;
Cold junction compensation circuit able to programme: responsive thermocouple cold junction, compensates the cold junction temperature of thermopair, and the cold junction temperature signal of thermopair is converted into voltage signal exports to operational amplification circuit; After having assembled, by zero-bit and the enlargement factor of outside test program frock debug circuit, after online programming debugging is qualified, zero-bit and enlargement factor are fixed transmitter;
Operational amplification circuit: by voltage signal operation amplifier to the 0～5V of pga circuit and cold junction compensation circuit able to programme output, and export to output protection circuit;
Output protection circuit: in the scope of be limited to-0.5V of the output voltage of operational amplification circuit～+ 6.5V, when fault, protection next stage system is not damaged;
Power circuit: be cold junction compensation circuit able to programme, pga circuit and operational amplification circuit power supply, and realize power filter, reverse connecting protection and transient impact protection.
In above-mentioned space flight, with in thermocouple temperature transmitter able to programme, pga circuit comprises programmable amplifier chip and six electric capacity of C1-C6, and wherein the 1st pin of programmable amplifier chip and the 8th pin are for the input of 5V power supply; The 2nd pin is for low-pass filtering; Zero-bit and the enlargement factor of the 3rd pin programmable amplifier, zero-bit can be set to 20mv～5V, and enlargement factor can be set to 70～1280 times; The 4th pin and the 5th pin connect respectively negative pole and the positive pole of input thermocouple signal; The 6th pin meets 5V for clamp output voltage, makes output voltage not higher than 5V, one-level circuit after protection; The 7th pin is the signal output after nursing one's health; C1, C2, C5 and C6 filter out power ripple; The internal resistance of C3 and programmable amplifier chip forms low-pass filter, and filtered signal disturbs; C4 filtering input signal disturbs.
In above-mentioned space flight with in thermocouple temperature transmitter able to programme, transmitter completes after assembling, by outside test program frock, programmable amplifier chip the 3rd pin is programmed, set zero-bit and enlargement factor, the thermocouple signal of different ranges is nursed one's health to 0.2V～4.8V, debug qualified after, test program frock is by programmable amplifier chip the 3rd pin, the polysilicon main fuse of programming fusing programmable amplifier chip internal, fixes zero-bit and enlargement factor.
In above-mentioned space flight with in thermocouple temperature transmitter able to programme, cold junction compensation circuit able to programme is comprised of film platinum resistor element, resistance bridge circuit, programmable amplifier chip and five electric capacity of C7-C11, wherein resistance bridge circuit is comprised of R1, R2, R3 and film platinum resistor, the resistance of film platinum resistor changes with the variation of cold junction temperature, and resistance bridge is converted into voltage signal by cold junction temperature signal; The 4th pin of programmable amplifier chip and the 5th pin connecting resistance electric bridge; The 7th pin is the cold junction compensation signal output after nursing one's health, and described cold junction compensation signal exports operational amplification circuit to, and draws by the connector of transmitter, to test cold junction compensation precision; The 1st pin and the 8th pin are for the input of 5V power supply; The 2nd pin is for low-pass filtering; Zero-bit and the enlargement factor of the 3rd pin programmable amplifier, zero-bit can be set to 20mv～5V, and enlargement factor can be set to 70～1280 times; The 6th pin meets 5V for clamp output voltage, makes output voltage not higher than 5V, one-level circuit after protection; C7, C8, C10 and C11 filter out power ripple; The internal resistance of C9 and programmable amplifier chip forms low-pass filter, and filtered signal disturbs.
In above-mentioned space flight with in thermocouple temperature transmitter able to programme, transmitter completes after assembling, according to the gain of thermocouple type, pga circuit and bias voltage, determine zero-bit and the enlargement factor of cold junction compensation circuit able to programme, by test program frock, programmable amplifier chip the 3rd pin is programmed, set zero-bit and enlargement factor, after detail programming is qualified, test program frock is by programmable amplifier chip the 3rd pin, the polysilicon main fuse of programming fusing programmable amplifier chip internal, fixes zero-bit and enlargement factor.
In above-mentioned space flight, with in thermocouple temperature transmitter able to programme, power circuit consists of current-limiting resistance, anti-reverse diode, shunt capacitance, voltage-reference, and wherein current-limiting resistance prevents that subsequent conditioning circuit short circuit from causing power supply short circuit; Shunt capacitance is used for suppressing interference and the transient impact protection of power circuit; Anti-reverse diode avoids reverse power connection to cause damage to circuit; Voltage-reference is 2.5V reference source and 5V reference source, for each modular circuit provides high-precision power.
In above-mentioned space flight, with in thermocouple temperature transmitter able to programme, output protection circuit is comprised of two diodes, in the scope of output voltage is limited to-0.5V～+ 6.5V.
In above-mentioned space flight with in thermocouple temperature transmitter able to programme, the hardware configuration of transmitter is comprised of printed board, shell, cover plate, connector, connector is nine contacts, contact is assigned as: power supply just, signal ground, mechanically, thermopair input anode Vi+, thermopair input negative terminal Vi-, output voltage V
o, cold junction compensation test lead VLD, digital spc input end DIGIN1 and the DIGIN2 of programmable amplifier chip.
The present invention compared with prior art tool has the following advantages:
(1) transmitter of the present invention is comprised of cold junction compensation circuit able to programme, pga circuit, operational amplification circuit, output protection circuit and power circuit; wherein to take programmable amplifier chip AD8556 be core to pga circuit; cold junction compensation circuit able to programme is comprised of film platinum resistor element Pt100, resistance bridge circuit and programmable amplifier chip AD8556; product reliability is high, and is applicable to multiple thermocouple type.
(2) test program frock of the present invention is by the connector interface of product, zero-bit and the enlargement factor of online programming debugging pga circuit and cold junction compensation circuit able to programme, after online programming debugging is qualified, by the fuse polysilicon main fuse of programmable amplifier chip internal of programming, zero-bit and enlargement factor are fixed, realize range adjustable, exempt from the advantage that hardware debug, suitable batch are produced, and debug process is simple;
(3) after Product Assembly of the present invention completes, range can be changed, and intelligent degree is high, exempts from hardware debug, and after having overcome existing product and having assembled, range cannot be changed, the shortcoming that intelligent degree is low.
(4) circuit source circuit of the present invention consists of current-limiting resistance, anti-reverse diode, shunt capacitance, voltage-reference, realizes the functions such as power filter, reverse connecting protection, transient impact protection;
(5) operational amplification circuit of the present invention is by output signal operation amplifier to the 0～5V of pga circuit and cold junction compensation circuit able to programme, in the scope of output protection circuit output voltage is limited to-0.5V～+ 6.5V, when fault, protection next stage system is not damaged;
(6) hardware configuration of transmitter of the present invention is comprised of printed board, shell, cover plate and connector, has realized the consistance of Miniaturization Design and the hardware configuration of hardware configuration.
Accompanying drawing explanation
Fig. 1 is the circuit working schematic diagram of thermocouple temperature transmitter of the present invention;
Fig. 2 is the power circuit schematic diagram of thermocouple temperature transmitter of the present invention;
Fig. 3 is the pga circuit schematic diagram of thermocouple temperature transmitter of the present invention;
Fig. 4 is the cold junction compensation circuit schematic diagram able to programme of thermocouple temperature transmitter of the present invention;
Fig. 5 is the construction profile figure of thermocouple temperature transmitter of the present invention;
Fig. 6 is the performance test wiring schematic diagram of thermocouple temperature transmitter of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Be illustrated in figure 1 the circuit working schematic diagram of thermocouple temperature transmitter of the present invention, thermocouple temperature transmitter product of the present invention is the wide voltage 6～15V power supply of single supply, is input as thermocouple signal, output voltage range 0～5V.As seen from the figure, thermocouple temperature transmitter circuit part is comprised of power circuit, pga circuit, cold junction compensation circuit able to programme, operational amplification circuit, output protection circuit.Power circuit is pga circuit, cold junction compensation circuit able to programme, operational amplification circuit power supply, realizes the functions such as power filter, reverse connecting protection, transient impact protection; Pga circuit is adjusted to 0.2V～4.8V voltage range by thermocouple signal, and voltage signal is exported to operational amplification circuit; The responsive thermocouple cold junction of cold junction compensation circuit energy able to programme, cold junction temperature to thermopair compensates, according to the gain of thermocouple type, pga circuit and bias voltage, cold junction temperature signal is converted into suitable voltage signal, voltage signal is exported to operational amplification circuit; Operational amplification circuit is by output signal operation amplifier to the 0～5V of pga circuit and cold junction compensation circuit able to programme, and the operational amplifier chip of this partial circuit has the feature of high-gain, Low Drift Temperature; Output protection circuit is comprised of two diodes, and in the scope of output voltage is limited to-0.5V～+ 6.5V, when fault, protection next stage system is not damaged.
Product completes after assembling, temperature range ability according to demand, and test program frock is by the connector interface of product, and online programming is debugged zero-bit and the enlargement factor of pga circuit and cold junction compensation circuit able to programme.After online programming debugging is qualified, test program frock, by the polysilicon main fuse of the programmable amplifier chip internal in programming Zapping circuit, is fixed zero-bit and enlargement factor, realizes the change of thermocouple signal and send function.
Be illustrated in figure 2 the power circuit schematic diagram of thermocouple temperature transmitter of the present invention, power circuit consists of current-limiting resistance, anti-reverse diode, shunt capacitance, voltage-reference as seen from the figure.Current-limiting resistance prevents that subsequent conditioning circuit short circuit from causing power supply short circuit; Shunt capacitance is used for suppressing interference and the transient impact protection of power circuit; Anti-reverse diode can avoid reverse power connection to cause damage to circuit; Reference source is 2.5V reference source and 5V reference source, for each modular circuit provides high-precision power.
Be illustrated in figure 3 the pga circuit schematic diagram of thermocouple temperature transmitter of the present invention, to take programmable amplifier chip AD8556 be core to pga circuit as seen from the figure, the feature that AD8556 has gain and offset voltage can digital programmable, common-mode rejection ratio is high, antijamming capability is strong.The 1st pin of this chip and the 8th pin are for the input of 5V power supply; The 2nd pin is for low-pass filtering; Zero-bit and the enlargement factor of the 3rd pin programmable amplifier, zero-bit can be set to 20mv～5V, and enlargement factor can be set to 70～1280 times; The 4th pin and the 5th pin connect respectively negative pole and the positive pole of input thermocouple signal; The 6th pin meets 5V for clamp output voltage, makes output voltage not higher than 5V, for the protection of rear one-level circuit; The 7th pin is the signal output after nursing one's health.C1, C2, C5 and C6 filter out power ripple.The internal resistance of C3 and programmable amplifier chip forms low-pass filter, and filtered signal disturbs.C4 filtering input signal disturbs.Product completes after assembling, and this circuit according to demand, is programmed to programmable amplifier chip the 3rd pin by test program frock, sets zero-bit and enlargement factor, by thermocouple signal conditioning 0.2V～4.8V scope of different ranges.After detail programming is qualified, test program frock is by programmable amplifier chip the 3rd pin, and the polysilicon main fuse of programming fusing programmable amplifier chip internal, fixes zero-bit and enlargement factor.
Be illustrated in figure 4 the cold junction compensation circuit schematic diagram able to programme of thermocouple temperature transmitter of the present invention; Cold junction compensation circuit able to programme is comprised of film platinum resistor element Pt100, resistance bridge circuit and programmable amplifier chip AD8556 as seen from the figure.R1, R2, R3 and film platinum resistor form resistance bridge, and the resistance of film platinum resistor changes with the variation of cold junction temperature, and resistance bridge is converted into voltage signal by cold junction temperature signal.The 4th pin of programmable amplifier chip and the 5th pin connecting resistance electric bridge; The 7th pin is the cold junction compensation signal output after nursing one's health, and this signal not only exports the operational amplification circuit of next stage to, also by the connector of transmitter, draws, to test cold junction compensation precision; The 1st pin and the 8th pin are for the input of 5V power supply; The 2nd pin is for low-pass filtering; Zero-bit and the enlargement factor of the 3rd pin programmable amplifier, zero-bit can be set to 20mv～5V, and enlargement factor can be set to 70～1280 times; The 6th pin meets 5V for clamp output voltage, makes output voltage not higher than 5V, one-level circuit after protection.C7, C8, C10 and C11 filter out power ripple.The internal resistance of C9 and programmable amplifier chip forms low-pass filter, and filtered signal disturbs.Product completes after assembling, according to the gain of thermocouple type, pga circuit and bias voltage, preliminary zero-bit and the enlargement factor of determining cold junction compensation circuit able to programme, by test program frock, programmable amplifier chip the 3rd pin is programmed, set zero-bit and enlargement factor, after detail programming is qualified, test program frock is by programmable amplifier chip the 3rd pin, the polysilicon main fuse of programming fusing programmable amplifier chip internal, fixes zero-bit and enlargement factor.
Be illustrated in figure 5 the construction profile figure of thermocouple temperature transmitter of the present invention, the structure of product is comprised of printed board, shell, cover plate, connector.The shell of product and cover plate are aluminum alloy materials, have the mounting hole of 4 Φ 4.5, and product is installed with 4 M4 screws.Connector is electric connector J14T-9ZJB, this electric connector is rain-proof type 9 needle constructions, and contact is assigned as: power supply just, signal ground, mechanically, digital spc input end DIGIN1 and the DIGIN2 of thermopair input anode Vi+, thermopair input negative terminal Vi-, output voltage VO, cold junction compensation test lead VLD, programmable amplifier chip.
The thermocouple temperature transmitter of having assembled is carried out to properties of product test, comprise nonlinearity erron test and cold junction compensation accuracy test.
One, nonlinearity erron test
Be illustrated in figure 6 the performance test wiring schematic diagram of thermocouple temperature transmitter of the present invention, press shown in Fig. 6 line attachments such as thermocouple temperature transmitter able to programme, D.C. regulated power supply, digital voltmeter, resistance R p and R1, the input voltage range of thermocouple signal is divided into 10 equal portions; V
i0, V
i1... V
i10, the resistance of Rp in adjusting figure, the input voltage that makes thermocouple temperature transmitter able to programme is V
i0, V
i1... V
i10, measure corresponding output signal value U
o0, U
o1... U
o10.
According to test data, ask for the fitting a straight line equation of the least square method linearity, i.e. formula (1), then by each input value V
isubstitution formula 1, just obtains each point value U of theoretical fitting straight line
on.
U
on＝K×V
in+U
o0(n＝1，2......10) (1)
In formula: K---the gain of transmitter.
Calculate successively input and output calibration value U
owith theoretical value U
ondeviation delta U
o, get its maximum deviation Δ U
omax, by formula (2), obtain nonlinearity erron δ
l.
Two, cold junction compensation accuracy test
According to shown in Fig. 6, turn on the electricity, and VLD is unsettled, and making input voltage is zero, measures output of products voltage U
oL, with formula (3), calculate U '
i:
In formula: U
o0for VLD connects signal ground, output voltage when input voltage is 0mV;
K is transmitter gain
By U '
iin corresponding thermocouple indexing table, find temperature value, this value and product environment temperature comparison of living in, difference is cold junction compensation precision.
The present invention for by the thermopair potential value operation amplifier in carrying space and weapon model, sends the voltage signal with the corresponding 0V～5V of temperature range, is applicable to the thermopairs such as K type, E type, T-shaped and tungsten rhenium type.
The above; only be the embodiment of the best of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
The content not being described in detail in instructions of the present invention belongs to professional and technical personnel in the field's known technology.
Claims (8)
1. a space flight thermocouple temperature transmitter able to programme, is characterized in that: comprise cold junction compensation circuit able to programme, pga circuit, operational amplification circuit, output protection circuit and power circuit, wherein:
Pga circuit: after transmitter has assembled by zero-bit and the enlargement factor of outside test program frock debug circuit, thermocouple signal is adjusted to 0.2V～4.8V voltage range, and voltage signal is exported to operational amplification circuit, after online programming debugging is qualified, zero-bit and enlargement factor are fixed;
Cold junction compensation circuit able to programme: for responsive thermocouple cold junction, the cold junction temperature of thermopair is compensated, and the cold junction temperature signal of thermopair is converted into voltage signal exports to operational amplification circuit; After having assembled, by zero-bit and the enlargement factor of outside test program frock debug circuit, after online programming debugging is qualified, zero-bit and enlargement factor are fixed transmitter;
Operational amplification circuit: by voltage signal operation amplifier to the 0～5V of pga circuit and cold junction compensation circuit able to programme output, and export to output protection circuit;
Output protection circuit: in the scope of be limited to-0.5V of the output voltage of operational amplification circuit～+ 6.5V, when fault, protection next stage system is not damaged;
Power circuit: be cold junction compensation circuit able to programme, pga circuit and operational amplification circuit power supply, and realize power filter, reverse connecting protection and transient impact protection.
2. a kind of space flight according to claim 1 thermocouple temperature transmitter able to programme, it is characterized in that: described pga circuit comprises programmable amplifier chip and six electric capacity of C1-C6, wherein the 1st pin of programmable amplifier chip and the 8th pin are for the input of 5V power supply; The 2nd pin is for low-pass filtering; Zero-bit and the enlargement factor of the 3rd pin programmable amplifier, zero-bit can be set to 20mv～5V, and enlargement factor can be set to 70～1280 times; The 4th pin and the 5th pin connect respectively negative pole and the positive pole of input thermocouple signal; The 6th pin meets 5V for clamp output voltage, makes output voltage not higher than 5V, one-level circuit after protection; The 7th pin is the signal output after nursing one's health; C1, C2, C5 and C6 filter out power ripple; The internal resistance of C3 and programmable amplifier chip forms low-pass filter, and filtered signal disturbs; C4 filtering input signal disturbs.
3. a kind of space flight according to claim 2 thermocouple temperature transmitter able to programme, it is characterized in that: described transmitter completes after assembling, by outside test program frock, programmable amplifier chip the 3rd pin is programmed, set zero-bit and enlargement factor, the thermocouple signal of different ranges is nursed one's health to 0.2V～4.8V, debug qualified after, test program frock is by programmable amplifier chip the 3rd pin, the polysilicon main fuse of programming fusing programmable amplifier chip internal, fixes zero-bit and enlargement factor.
4. a kind of space flight according to claim 1 thermocouple temperature transmitter able to programme, it is characterized in that: described cold junction compensation circuit able to programme is comprised of film platinum resistor element, resistance bridge circuit, programmable amplifier chip and five electric capacity of C7-C11, wherein resistance bridge circuit is comprised of R1, R2, R3 and film platinum resistor, the resistance of film platinum resistor changes with the variation of cold junction temperature, and resistance bridge is converted into voltage signal by cold junction temperature signal; The 4th pin of programmable amplifier chip and the 5th pin connecting resistance electric bridge; The 7th pin is the cold junction compensation signal output after nursing one's health, and described cold junction compensation signal exports operational amplification circuit to, and draws by the connector of transmitter, to test cold junction compensation precision; The 1st pin and the 8th pin are for the input of 5V power supply; The 2nd pin is for low-pass filtering; Zero-bit and the enlargement factor of the 3rd pin programmable amplifier, zero-bit can be set to 20mv～5V, and enlargement factor can be set to 70～1280 times; The 6th pin meets 5V for clamp output voltage, makes output voltage not higher than 5V, one-level circuit after protection; C7, C8, C10 and C11 filter out power ripple; The internal resistance of C9 and programmable amplifier chip forms low-pass filter, and filtered signal disturbs.
5. a kind of space flight according to claim 4 thermocouple temperature transmitter able to programme, it is characterized in that: described transmitter completes after assembling, according to thermocouple type, the gain of pga circuit and bias voltage, determine zero-bit and the enlargement factor of cold junction compensation circuit able to programme, by test program frock, programmable amplifier chip the 3rd pin is programmed, set zero-bit and enlargement factor, after detail programming is qualified, test program frock is by programmable amplifier chip the 3rd pin, the polysilicon main fuse of programming fusing programmable amplifier chip internal, zero-bit and enlargement factor are fixed.
6. a kind of space flight according to claim 1 thermocouple temperature transmitter able to programme, it is characterized in that: described power circuit consists of current-limiting resistance, anti-reverse diode, shunt capacitance, voltage-reference, wherein current-limiting resistance prevents that subsequent conditioning circuit short circuit from causing power supply short circuit; Shunt capacitance is used for suppressing interference and the transient impact protection of power circuit; Anti-reverse diode avoids reverse power connection to cause damage to circuit; Voltage-reference is 2.5V reference source and 5V reference source, for each modular circuit provides high-precision power.
7. a kind of space flight according to claim 1 thermocouple temperature transmitter able to programme, is characterized in that: described output protection circuit is comprised of two diodes, in the scope of output voltage is limited to-0.5V～+ 6.5V.
8. a kind of space flight according to claim 1 thermocouple temperature transmitter able to programme, it is characterized in that: the hardware configuration of described transmitter is comprised of printed board, shell, cover plate, connector, connector is nine contacts, and contact is assigned as: power supply just, signal ground, mechanically, thermopair input anode Vi+, thermopair input negative terminal Vi-, output voltage VO, cold junction compensation test lead VLD, digital spc input end DIGIN1 and the DIGIN2 of programmable amplifier chip.
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| CN201210219129.2A CN102735362B (en) | 2012-06-20 | 2012-06-20 | Astronautic programmable thermocouple temperature transmitter |
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| CN201210219129.2A CN102735362B (en) | 2012-06-20 | 2012-06-20 | Astronautic programmable thermocouple temperature transmitter |
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| CN103674308B (en) * | 2013-12-31 | 2016-08-17 | 大连交通大学 | Accurate adjustable thermocouple cold junction compensation instrument |
| CN105628236A (en) * | 2015-12-20 | 2016-06-01 | 苏州长风航空电子有限公司 | Thermocouple temperature signal acquisition method |
| CN107607133B (en) * | 2017-10-19 | 2023-10-31 | 浙江沃德尔科技集团股份有限公司 | High-precision Hall sensing device and packaging programming method thereof |
| CN108007595B (en) * | 2017-11-21 | 2020-01-14 | 西北工业大学 | Probe type film thermocouple temperature sensor and manufacturing method thereof |
| CN108061607A (en) * | 2017-11-30 | 2018-05-22 | 贵州航天电子科技有限公司 | A kind of small volume high precision temperature measurement module |
| CN115333066A (en) * | 2021-05-11 | 2022-11-11 | 华为技术有限公司 | Voltage protection device and system |
| CN114962315B (en) * | 2022-06-17 | 2023-08-22 | 苏州浪潮智能科技有限公司 | PSU fan rotating speed control method, system, device and medium |
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| CN2864634Y (en) * | 2005-12-23 | 2007-01-31 | 保定天威集团有限公司 | Intelligent temperature patrol detector |
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| CN102162740A (en) * | 2010-12-14 | 2011-08-24 | 中国飞机强度研究所 | Transmitter |
| CN102305670A (en) * | 2011-05-19 | 2012-01-04 | 江苏红光仪表厂有限公司 | Thermocouple temperature transducer in real-time wireless communication industry |
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| US4120201A (en) * | 1977-03-18 | 1978-10-17 | Partlow Corporation | Thermocouple temperature measurement circuit having cold junction compensation |
| CN2864634Y (en) * | 2005-12-23 | 2007-01-31 | 保定天威集团有限公司 | Intelligent temperature patrol detector |
| CN201166913Y (en) * | 2008-02-03 | 2008-12-17 | 赵敏 | Temperature transmitter |
| CN102162740A (en) * | 2010-12-14 | 2011-08-24 | 中国飞机强度研究所 | Transmitter |
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