CN207570691U - A kind of signal acquisition circuit of double temperature sensor - Google Patents
A kind of signal acquisition circuit of double temperature sensor Download PDFInfo
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- CN207570691U CN207570691U CN201721368453.5U CN201721368453U CN207570691U CN 207570691 U CN207570691 U CN 207570691U CN 201721368453 U CN201721368453 U CN 201721368453U CN 207570691 U CN207570691 U CN 207570691U
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Abstract
The utility model discloses a kind of signal acquisition circuits of double temperature sensor, it is characterised in that：Including Pt Resistance Temperature Measuring Circuit and thermistor temperature detecting circuit；For receiving the output signal of Pt Resistance Temperature Measuring Circuit and carrying out the first instrument amplifier of signal amplification；For receiving the output signal of thermistor temperature detecting circuit and carrying out the second instrument amplifier of signal amplification；For receiving two instrument amplifier output signals and carrying out the analog to digital conversion circuit of digital-to-analogue conversion；For the data processing unit for receiving analog to digital conversion circuit output signal and displaying data；And power-switching circuit；Power-switching circuit is connect respectively with first instrument amplifier, second instrument amplifier, analog to digital conversion circuit；Pt Resistance Temperature Measuring Circuit is connect with first instrument amplifier；Thermistor temperature detecting circuit is connect with second instrument amplifier；Analog to digital conversion circuit is connect with first instrument amplifier, second instrument amplifier；Analog to digital conversion circuit is connect by isolation circuit with data processing unit.
Description
Technical field
The utility model is related to temperature sensor technology field, more particularly to a kind of signal acquisition of double temperature sensor
Circuit.
Background technology
Thermocouple temperature sensor and platinum resistance temperature sensor measure temperature and have been widely applied to various temperature
Detection.The detection temperature range of thermocouple is very wide, and ± 0.1 DEG C of precision can be reached in -270 DEG C to+1750 DEG C wide scopes, and
The operation principle of platinum resistance allows it to have the good linearity in low temperature range.Current most of temperature measurement circuits are only with single temperature
Sensor is spent, temperature-measuring results is caused to have certain error.Different temperatures range is measured in order to give full play to thermocouple and platinum resistance
Ability allows thermocouple, platinum resistance temperature sensor and analog-digital converter to be combined, and forms high performance temperature measurement system.
High-resolution hydrocode is needed in industry and medical application, and temperature range is different during in-site measurement, such as
Fruit can influence the accuracy of measurement result with single temperature sensor.
Utility model content
There is extraordinary line in low temperature range using platinum resistance temperature sensor in the circuit of the utility model design
Property degree and thermocouple has the characteristics of good advantage in high temperature range measurement, have platinum resistance temperature sensing in middle low temperature range
Device carries out temperature acquisition, and high temperature range is interior to be acquired temperature signal by thermocouple temperature sensor, and temperature signal is passed to specially
Instrument amplifier carries out signal amplification filtering, then carries out modulus isolation, recently enters data processing unit and carries out data
Processing.The utility model is adopted the technical scheme that solve technical problem present in known technology：
A kind of signal acquisition circuit of double temperature sensor, it is characterised in that：It includes at least：
Pt Resistance Temperature Measuring Circuit and thermistor temperature detecting circuit；
For receiving the output signal of Pt Resistance Temperature Measuring Circuit and carrying out the first instrument amplifier of signal amplification；
For receiving the output signal of thermistor temperature detecting circuit and carrying out the second instrument amplifier of signal amplification；
Turn for receiving the output signal of first instrument amplifier, second instrument amplifier and carrying out the modulus of digital-to-analogue conversion
Change circuit；
For the data processing unit for receiving the output signal of analog to digital conversion circuit and displaying data；
And power-switching circuit；Wherein：
The power output terminal of the power-switching circuit respectively with first instrument amplifier, second instrument amplifier, mould
The power supply terminal electrical connection of number conversion circuit；The output signal terminal of the Pt Resistance Temperature Measuring Circuit and first instrument amplifier
Signal input terminal is electrically connected；The output signal terminal and the signal of second instrument amplifier of the thermistor temperature detecting circuit are defeated
Enter terminal electrical connection；Input end of analog signal of analog-digital conversion circuit as described respectively with first instrument amplifier, second instrument
The signal output terminal electrical connection of amplifier；Digital signal output end of analog-digital conversion circuit as described passes through isolation circuit and number
It is electrically connected according to the I/O terminals of processing unit.
Preferably, the utility model additionally uses following technical solution：
Further：Further include the traffic filter positioned at first instrument amplifier and second instrument amplifier input side；Institute
The output signal terminal for stating Pt Resistance Temperature Measuring Circuit passes through the signal input terminal of traffic filter and first instrument amplifier electricity
Connection；The output signal terminal of the thermistor temperature detecting circuit is defeated by the signal of traffic filter and second instrument amplifier
Enter terminal electrical connection.
Further：The model AD8237 of the first instrument amplifier, the parameter of the first instrument amplifier are：It is defeated
Enter that electric current is 115 microamperes, single supply power supply is+5V；
The model AD8495 of the second instrument amplifier, the second instrument amplifier are inputted for high-impedance differential,
The second instrument amplifier is powered using 5mV/ DEG C of independent output, single supply for+5V, built-in internal cold junction compensation function.
Further：Analog-digital conversion circuit as described includes the modulus conversion chip of model LTC1864, the analog-to-digital conversion core
Piece is 2 channel, 16 modulus conversion chips, and single supply power supply is+5V, and reference voltage is+4.096V.
Further：The power-switching circuit includes the first power conversion chip of model TLV1117-5, model
The reference voltage generating circuit of ADR4540 and the second source conversion chip of model TLV1117-3.3；First power supply turns
The input terminal for changing chip is electrically connected with+8V direct currents；The output terminal of first power conversion chip amplifies respectively with first instrument
The power supply terminal electrical connection of device, second instrument amplifier, analog to digital conversion circuit；The input terminal of the reference voltage generating circuit
It being electrically connected with the output terminal of the first power conversion chip, the output terminal of the reference voltage generating circuit is+4.096V direct currents,
The output terminal of the reference voltage generating circuit is electrically connected with the trigger terminal of analog to digital conversion circuit；The second source converts core
The input terminal of piece is electrically connected with the output terminal of the first power conversion chip, and the leading-out terminal of the second source conversion chip is
+ 3.3V direct currents, the leading-out terminal of the second source conversion chip are electrically connected with the power supply trigger terminal of isolation circuit.
Further：The model EP4CE6E144 of the data processing unit, the parameter of the data processing unit are：It is single
Power source supplying voltage 3.3V, kernel supply voltage 1.2V.
The utility model has the advantages and positive effects of：
By using above-mentioned technical proposal, the utility model carries out temperature signal collection using two kinds of temperature sensors, can
To be applicable in the needs for acquiring different experimental situation temperature datas, carried out under middle low temperature condition using platinum resistance temperature sensor
Temperature signal collection is acquired in the case of a high temperature using thermocouple temperature sensor, and two ways can be according to different
Requirement of experiment is selected, while thermocouple temperature sensor connects the dedicated instrument amplifier with cold junction temperature-compensating,
The sensor for not needing to be other carries out cold junction temperature acquisition, and in summary, acquisition can be improved by carrying out thermometric using such circuit
The efficiency of data and the precision of experimental result.
Description of the drawings
Fig. 1 is the circuit block diagram of the preferred embodiment in the utility model；
Fig. 2 is the power-switching circuit in the preferred embodiment in the utility model；
Fig. 3 is the reference voltage generating circuit in the preferred embodiment in the utility model；
Fig. 4 is thermocouple signal acquisition amplifying circuit in the preferred embodiment in the utility model；
Fig. 5 is that platinum resistance bridge signal acquires amplifying circuit in the preferred embodiment in the utility model；
Fig. 6 is thermocouple analog to digital conversion circuit in the preferred embodiment in the utility model；
Fig. 7 is platinum resistance electric bridge analog to digital conversion circuit in the preferred embodiment in the utility model；
Fig. 8 is isolation circuit in the preferred embodiment in the utility model；
Specific embodiment
For that can further appreciate that the utility model content, feature and effect of the utility model, the following examples are hereby given, and
It is described in detail with the accompanying drawings as follows：
It please refers to Fig.1 to Fig. 8, a kind of signal acquisition circuit of double temperature sensor, including：
Pt Resistance Temperature Measuring Circuit and thermistor temperature detecting circuit；
For receiving the output signal of Pt Resistance Temperature Measuring Circuit and carrying out the first instrument amplifier of signal amplification；
For receiving the output signal of thermistor temperature detecting circuit and carrying out the second instrument amplifier of signal amplification；
Turn for receiving the output signal of first instrument amplifier, second instrument amplifier and carrying out the modulus of digital-to-analogue conversion
Change circuit；
For the data processing unit for receiving the output signal of analog to digital conversion circuit and displaying data；
And power-switching circuit；Wherein：
The power output terminal of the power-switching circuit respectively with first instrument amplifier, second instrument amplifier, mould
The power supply terminal electrical connection of number conversion circuit；The output signal terminal of the Pt Resistance Temperature Measuring Circuit and first instrument amplifier
Signal input terminal is electrically connected；The output signal terminal and the signal of second instrument amplifier of the thermistor temperature detecting circuit are defeated
Enter terminal electrical connection；Input end of analog signal of analog-digital conversion circuit as described respectively with first instrument amplifier, second instrument
The signal output terminal electrical connection of amplifier；Digital signal output end of analog-digital conversion circuit as described passes through isolation circuit and number
It is electrically connected according to the I/O terminals of processing unit.
In order to improve accuracy of detection, the signal positioned at first instrument amplifier and second instrument amplifier input side is further included
Wave filter；The output signal terminal of the Pt Resistance Temperature Measuring Circuit is defeated by the signal of traffic filter and first instrument amplifier
Enter terminal electrical connection；The output signal terminal of the thermistor temperature detecting circuit passes through traffic filter and second instrument amplifier
Signal input terminal electrical connection.
In above preferred embodiment：
It please refers to Fig.1, Fig. 2 and Fig. 3, the power-switching circuit include：The first power supply conversion of model TLV1117-5
The second source conversion chip of chip, the reference voltage generating circuit of model ADR4540 and model TLV1117-3.3；Institute
The input terminal for stating the first power conversion chip is electrically connected with+8V direct currents；The output terminal of first power conversion chip respectively with
The power supply terminal electrical connection of first instrument amplifier, second instrument amplifier, analog to digital conversion circuit；The reference voltage generation electricity
The input terminal on road is electrically connected with the output terminal of the first power conversion chip, the output terminal of the reference voltage generating circuit for+
4.096V direct currents, the output terminal of the reference voltage generating circuit are electrically connected with the trigger terminal of analog to digital conversion circuit；It is described
The input terminal of second source conversion chip is electrically connected with the output terminal of the first power conversion chip, and the second source converts core
The leading-out terminal of piece is+3.3V direct currents, and the leading-out terminal of the second source conversion chip and the power supply of isolation circuit trigger
Terminal is electrically connected；
Please refer to Fig. 4 and Fig. 5, the model AD8237 of the first instrument amplifier, the first instrument amplifier
Parameter is：Input current is 115 microamperes, single supply power supply is+5V；The model AD8495 of the second instrument amplifier, institute
It states second instrument amplifier to input for high-impedance differential, the second instrument amplifier is using 5mV/ DEG C of independent output, single electricity
Source powers for+5V, built-in internal cold junction compensation function.It is passed by the platinum resistance electric bridge that platinum resistance PT100 is formed and electric thermo-couple temperature
Sensor makees sensor and carries out temperature signal collection.When the circuit works, PT100 temperature sensors acquisition experimental temperature passes through platinum
Resistance bridge forms analog signal platinum resistance electric bridge input+and platinum resistance electric bridge inputs-and inputs magnifier progress signal
Amplification.The experimental temperature of thermocouple temperature sensor acquisition simultaneously, temperature signal are thermocouple input+and thermocouple input-entrance
Instrument amplifying circuit is amplified processing.Platinum resistance bridge signal by enhanced processing enters analog-to-digital conversion electricity with thermocouple signal
Road carries out analog-to-digital conversion and enters isolation circuit progress signal isolation processing, platinum resistance electric bridge digital signal 2 and heat into digital signal
Galvanic couple digital signal 2 is calculated into data processing unit, obtains desired experimental temperature, the two can both use simultaneously or
It can be needed to measure temperature according to specific experiment.
Fig. 6 and Fig. 7 are please referred to, analog-digital conversion circuit as described input signal is the analog signal of 2.048V to 4.096V, defeated
Go out for digital signal；The modulus conversion chip model LTC1864, is 2 channel, 16 modulus conversion chips, and single supply is powered
+ 5V, reference voltage+4.096V；
Referring to Fig. 8, the isolation circuit includes：Modulus conversion chip exports platinum resistance electric bridge digital signal and thermocouple
Digital signal is electrically connected with isolating chip；Platinum resistance electric bridge digital signal and thermocouple digital signal and data by isolation
The electrical connection of processing unit；Platinum resistance electric bridge digital signal by isolation enters data processing list with thermocouple digital signal
Member；The isolating chip model ISO7342, single supply power supply+5V are low-power consumption four-way isolator；
In above preferred embodiment：
The power-switching circuit includes：For input+8V voltages to be converted to+5V voltages supply instrument amplifier, mould
Number conversion circuit, reference voltage conversion circuit, isolation circuit；
Reference voltage conversion circuit, the reference voltage conversion circuit include：For+5V voltage conversions+4.096V is electric
The chip of pressure, conversion chip are electrically connected with modulus conversion chip；
Instrument amplifier, the instrument amplifier include：The platinum resistance bridge signal and thermocouple of acquisition are through input terminal
Input instrument amplifier electrical connection；
Analog to digital conversion circuit, analog-digital conversion circuit as described include：Instrument amplifier exports platinum resistance bridge signal and thermoelectricity
Even signal is electrically connected with modulus conversion chip；The simulation that analog-digital conversion circuit as described input signal is 2.048V to 4.096V is believed
Number, it exports as digital signal；The modulus conversion chip model LTC1864 is 2 channel, 16 modulus conversion chips, single electricity
Source power supply+5V, reference voltage+4.096V；
Isolation circuit, the isolation circuit include：Modulus conversion chip exports platinum resistance electric bridge digital signal and thermocouple
Digital signal is electrically connected with isolating chip；Platinum resistance electric bridge digital signal and thermocouple digital signal and data by isolation
The electrical connection of processing unit；Platinum resistance electric bridge digital signal by isolation enters data processing list with thermocouple digital signal
Member；The isolating chip model ISO7342, single supply power supply+5V are low-power consumption four-way isolator；
The data processing unit chip model be EP4CE6E144, single supply supply voltage 3.3V, kernel supply voltage
1.2V。
The embodiment of the utility model is described in detail above, but the content is only the preferable of the utility model
Embodiment, it is impossible to be construed as limiting the scope of the utility model.It is made according to the scope of application of this utility model equal
Deng variation and improvement etc., should all still belong within the patent covering scope of the utility model.
Claims (6)
1. a kind of signal acquisition circuit of double temperature sensor, it is characterised in that：It includes at least：
Pt Resistance Temperature Measuring Circuit and thermistor temperature detecting circuit；
For receiving the output signal of Pt Resistance Temperature Measuring Circuit and carrying out the first instrument amplifier of signal amplification；
For receiving the output signal of thermistor temperature detecting circuit and carrying out the second instrument amplifier of signal amplification；
For receive the output signal of first instrument amplifier, second instrument amplifier and carry out digital-to-analogue conversion analog-to-digital conversion electricity
Road；
For the data processing unit for receiving the output signal of analog to digital conversion circuit and displaying data；
And power-switching circuit；Wherein：
The power output terminal of the power-switching circuit turns respectively with first instrument amplifier, second instrument amplifier, modulus
Change the power supply terminal electrical connection of circuit；The output signal terminal of the Pt Resistance Temperature Measuring Circuit and the signal of first instrument amplifier
Input terminal is electrically connected；The output signal terminal of the thermistor temperature detecting circuit and the signal input part of second instrument amplifier
Son electrical connection；Input end of analog signal of analog-digital conversion circuit as described amplifies respectively with first instrument amplifier, second instrument
The signal output terminal electrical connection of device；Digital signal output end of analog-digital conversion circuit as described passes through at isolation circuit and data
Manage the I/O terminals electrical connection of unit.
2. the signal acquisition circuit of double temperature sensor according to claim 1, it is characterised in that：It further includes positioned at first
The traffic filter of instrument amplifier and second instrument amplifier input side；The output signal terminal of the Pt Resistance Temperature Measuring Circuit
It is electrically connected by traffic filter with the signal input terminal of first instrument amplifier；The output of the thermistor temperature detecting circuit
Signal terminal is electrically connected by traffic filter with the signal input terminal of second instrument amplifier.
3. the signal acquisition circuit of double temperature sensor according to claim 1 or 2, it is characterised in that：
The model AD8237 of the first instrument amplifier, the parameter of the first instrument amplifier are：Input current is 115
Microampere, single supply power supply are+5V；
The model AD8495 of the second instrument amplifier, the second instrument amplifier is inputted for high-impedance differential, described
Second instrument amplifier is powered using 5mV/ DEG C of independent output, single supply for+5V, built-in internal cold junction compensation function.
4. the signal acquisition circuit of double temperature sensor according to claim 1 or 2, it is characterised in that：The modulus turns
The modulus conversion chip that circuit includes model LTC1864 is changed, the modulus conversion chip is 2 channel, 16 analog-to-digital conversion cores
Piece, single supply power supply are+5V, and reference voltage is+4.096V.
5. the signal acquisition circuit of double temperature sensor according to claim 1 or 2, it is characterised in that：The power supply turns
Change the first power conversion chip of circuit including model TLV1117-5, the reference voltage generating circuit of model ADR4540 and
The second source conversion chip of model TLV1117-3.3；The input terminal of first power conversion chip is electrically connected with+8V direct currents
It connects；The output terminal of first power conversion chip is electric with first instrument amplifier, second instrument amplifier, analog-to-digital conversion respectively
The power supply terminal electrical connection on road；The output terminal of the input terminal of the reference voltage generating circuit and the first power conversion chip electricity
Connection, the output terminal of the reference voltage generating circuit are+4.096V direct currents, the output terminal of the reference voltage generating circuit
It is electrically connected with the trigger terminal of analog to digital conversion circuit；The input terminal of the second source conversion chip and the first power supply conversion core
The output terminal electrical connection of piece, the leading-out terminal of the second source conversion chip is+3.3V direct currents, the second source conversion
The leading-out terminal of chip is electrically connected with the power supply trigger terminal of isolation circuit.
6. the signal acquisition circuit of double temperature sensor according to claim 1 or 2, it is characterised in that：At the data
The model EP4CE6E144 of unit is managed, the parameter of the data processing unit is：Single supply supply voltage 3.3V, kernel power supply
Voltage 1.2V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721368453.5U CN207570691U (en) | 2017-10-23 | 2017-10-23 | A kind of signal acquisition circuit of double temperature sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721368453.5U CN207570691U (en) | 2017-10-23 | 2017-10-23 | A kind of signal acquisition circuit of double temperature sensor |
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| CN207570691U true CN207570691U (en) | 2018-07-03 |
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| CN201721368453.5U Expired - Fee Related CN207570691U (en) | 2017-10-23 | 2017-10-23 | A kind of signal acquisition circuit of double temperature sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959323A (en) * | 2021-11-04 | 2022-01-21 | 沈阳仪表科学研究院有限公司 | Signal processing method of single-power-supply high-temperature LVDT sensor with temperature sensor |
-
2017
- 2017-10-23 CN CN201721368453.5U patent/CN207570691U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959323A (en) * | 2021-11-04 | 2022-01-21 | 沈阳仪表科学研究院有限公司 | Signal processing method of single-power-supply high-temperature LVDT sensor with temperature sensor |
| CN113959323B (en) * | 2021-11-04 | 2023-09-12 | 沈阳仪表科学研究院有限公司 | Signal processing method of high-temperature LVDT sensor with temperature sensor supplied by single power source |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180703 Termination date: 20201023 |