CN206339316U - Multi-channel temperature measurement device - Google Patents
Multi-channel temperature measurement device Download PDFInfo
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- CN206339316U CN206339316U CN201621486681.8U CN201621486681U CN206339316U CN 206339316 U CN206339316 U CN 206339316U CN 201621486681 U CN201621486681 U CN 201621486681U CN 206339316 U CN206339316 U CN 206339316U
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- switch
- amplifying circuit
- temperature sensor
- excitation
- circuit
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Abstract
The utility model provides a kind of multi-channel temperature measurement device, and multi-channel temperature measurement device includes：N 4 line metallic resistance temperature sensors, n >=2, n ∈ N；The positive pole of constant-current source, negative pole connection the first excitation switch；Resistor connects the current feed of temperature sensor；The positive pole of first amplifying circuit, negative pole connect the two ends of resistor respectively；The voltage lead of the input connection temperature sensor of second amplifying circuit；Break-make between second excitation switch control temperature sensor and the first excitation switch, the second amplifying circuit；Control circuit control the first excitation switch and the second excitation switch；The output of processing circuit processes amplifying circuit obtains the temperature T that i-th of temperature sensor is measuredi.The utility model has high precision, low cost and other advantages.
Description
Technical field
The utility model is related to temperature detection, more particularly to multi-channel temperature measurement device.
Background technology
High-precision multi way temperature collecting device is to multi way temperature signal high precision measuring system.At present, height is widely used
Accurate multipath temperature collecting device, including excitation power supply, multi way temperature sensor RTD, multichannel amplifying circuit, multichannel ADC
And microprocessor.Excitation power supply provides constant current using micro-current constant-current source, and electric current flows through fixed value resistance and RTD, amplifies
Circuit carries out differential amplification to fixed value resistance and RTD both end voltage, multichannel ADC Acquisition Instruments amplifying circuit output voltage,
Voltage of the microprocessor according to the voltage for collecting fixed value resistance and per RTD all the way carries out proportion expression and calculates RTD
Resistance, so as to obtain per temperature value all the way.The main deficiency of the technology is：
1. temperature collecting device is in long-term work, there is follow current to flow through on RTD and form heat accumulation, produce
Self-heating effect, and different metal materials can form thermo-electromotive force, can all cause the deviation of measurement accuracy.
2. multichannel temperature measurement necessarily uses more multichannel pmultiple amplifier, requiring inevitable to ADC acquisition channels also increases, and adds
Circuit cost and circuit area, while multichannel instrument is bad with amplifying circuit uniformity, decline the measurement device degree of accuracy.
Utility model content
To solve the deficiency in above-mentioned prior art, the utility model provide a kind of high precision, good reliability, into
This low multi-channel temperature measurement device.
The purpose of this utility model is achieved through the following technical solutions：
A kind of multi-channel temperature measurement device；The multi-channel temperature measurement device includes：
N 4 line metallic resistance temperature sensors, n >=2, n ∈ N；
Constant-current source, the positive pole connection first of the constant-current source encourages the first of switch, three-way switch, negative pole connection first
Encourage switch second, four-way switch；
First excitation switch, first, second way switch of the first excitation switch connects the input of resistor, the
3rd, four-way switch connects the second current feed of each temperature sensor；
Resistor, the output end of the resistor connects the first current feed of each temperature sensor；
First amplifying circuit, the positive pole of first amplifying circuit, negative pole connect the two ends of the resistor respectively；
Second amplifying circuit, the first voltage that the positive pole of second amplifying circuit connects each temperature sensor is drawn
Line, negative pole connects the second voltage lead of each temperature sensor；
Second excitation switch, the second excitation switch has 3n way switch, and n >=2, n ∈ N control temperature sensor
With the break-make between the first excitation switch, the second amplifying circuit；
Control circuit, control circuit control the first excitation switch and the second excitation switch；
Process circuit, the voltage for the resistor that the first amplifying circuit transmission described in the processing circuit processes comes
U1Hinder i、U2Hinder iSecond amplifying circuit transmits the voltage U1 of i-th of temperature sensorPass i、U2Pass i, obtain i-th of temperature sensor and survey
The temperature obtainedR0It is resistance of the metallic resistance at 0 degree, a is
The inverse of the sensitivity of metallic resistance, RResistanceIt is the resistance of the resistor.
According to above-mentioned multi-channel temperature measurement device, described first encourages the first of switch, four-way switch closure, other
Switch off, the first amplifying circuit output U1Hinder i；The 3i of the second excitation switch corresponding with i-th temperature sensor,
3i-1,3i-2 switch closures, other to switch off, the second amplifying circuit output U1Pass i；
Second, third way switch closure of the first excitation switch, other to switch off, the first amplifying circuit output
U2Hinder i；Closed with 3i, 3i-1,3i-2 switches of the corresponding second excitation switch of i-th of temperature sensor, its
It is switched off, the second amplifying circuit output U2Pass i, above-mentioned i=1,2,3n.
Compared with prior art, the utility model have the advantage that for：
1. measurement accuracy is high.Change the constant-current source sense of current by encouraging switch, eliminate thermoelectrical potential to the precision of circuit
Influence, goes to eliminate the spontaneous fuel factor of temperature detecting resistance, so as to improve precision by encouraging switch to change switch off time.
2. circuit is simple, low cost, reliability is high.When multiple sensor is measured, the circuit of signal condition is same, is subtracted
Lack circuit cost and circuit area to have saved cost, improve the uniformity of circuit, reliability.
Brief description of the drawings
Referring to the drawings, disclosure of the present utility model will be easier to understand.Skilled addressee readily understands that
It is：These accompanying drawings are used only for illustrating the technical solution of the utility model, and are not intended to protection of the present utility model
Scope is construed as limiting.In figure：
Fig. 1 is the structure diagram of the multi-channel temperature measurement device according to the utility model embodiment.
Embodiment
Fig. 1 and following description describe optional embodiment of the present utility model to instruct those skilled in the art how real
Apply and reproduce the utility model.In order to instruct technical solutions of the utility model, simplify or eliminate some conventional aspects.Ability
Field technique personnel should be appreciated that modification or replacement from these embodiments will be in the range of the utility model.This area skill
Art personnel should be appreciated that following characteristics can combine to form multiple modifications of the present utility model in a variety of ways.Thus, this reality
Following optional embodiments are not limited to new, and are only limited by claim and their equivalent.
Embodiment：
Fig. 1 schematically illustrates the structure diagram of the multi-channel temperature measurement device of the utility model embodiment, such as Fig. 1 institutes
Show, the multi-channel temperature measurement device includes：
N 4 line metallic resistance temperature sensors, n >=2, n ∈ N；Such as use RTD；
Constant-current source, the positive pole connection first of the constant-current source encourages the first of switch, three-way switch, negative pole connection first
Encourage switch second, four-way switch；
First excitation switch, first, second way switch of the first excitation switch connects the input of resistor, the
3rd, four-way switch connects the second current feed of each temperature sensor；
Resistor, the output end of the resistor connects the first current feed of each temperature sensor；
First amplifying circuit, the positive pole of first amplifying circuit, negative pole connect the two ends of the resistor respectively；
Second amplifying circuit, the first voltage that the positive pole of second amplifying circuit connects each temperature sensor is drawn
Line, negative pole connects the second voltage lead of each temperature sensor；
Second excitation switch, the second excitation switch has 3n way switch, and n >=2, n ∈ N control temperature sensor
With the break-make between the first excitation switch, the second amplifying circuit；
Analog-digital conversion circuit as described, mould are sent in analog to digital conversion circuit, first amplifying circuit, the output of the second amplifying circuit
The process circuit is sent in the output of number change-over circuit；
Control circuit, control circuit control the first excitation switch and the second excitation switch；
Process circuit, the voltage for the resistor that the first amplifying circuit transmission described in the processing circuit processes comes
U1Hinder i、U2Hinder iSecond amplifying circuit transmits the voltage U1 of i-th of temperature sensorPass i、U2Pass i, obtain i-th of temperature sensor and survey
The temperature obtainedR0It is resistance of the metallic resistance at 0 degree, a is
The inverse of the sensitivity of metallic resistance, RResistanceIt is the resistance of the resistor.
Described first encourages the first of switch, four-way switch closure, other to switch off, the first amplifying circuit output
U1Hinder i；Closed with 3i, 3i-1,3i-2 switches of the corresponding second excitation switch of i-th of temperature sensor, its
It is switched off, the second amplifying circuit output U1Pass i；
Second, third way switch closure of the first excitation switch, other to switch off, the first amplifying circuit output
U2Hinder i；Closed with 3i, 3i-1,3i-2 switches of the corresponding second excitation switch of i-th of temperature sensor, its
It is switched off, the second amplifying circuit output U2Pass i, above-mentioned i=1,2,3 ... n.
The multi-channel temperature measurement method of the utility model embodiment, namely above-mentioned multi-channel temperature measurement device work side
Method, the multi-channel temperature measurement method comprises the following steps：
(A1) described first the first of switch, four-way switch closure is encouraged, other to switch off, the first amplifying circuit is defeated
Go out U1Hinder i；Closed with 3i, 3i-1,3i-2 switches of the corresponding second excitation switch of i-th of temperature sensor,
It is other to switch off, the second amplifying circuit output U1Pass i；
(A2) second, third way switch closure of the first excitation switch, other to switch off, the first amplifying circuit is defeated
Go out U2Hinder i；Closed with 3i, 3i-1,3i-2 switches of the corresponding second excitation switch of i-th of temperature sensor,
It is other to switch off, the second amplifying circuit output U2Pass i；
(A3) process circuit is according to the voltage U1 receivedHinder i、U2Hinder i、U1Pass iAnd U2Pass iObtain i-th of temperature sensor survey
The temperature obtainedR0It is resistance of the metallic resistance at 0 degree, a is
The inverse of the sensitivity of metallic resistance, RResistanceIt is the resistance of the resistor；
Above-mentioned i=1,2,3 ... n.
Claims (4)
1. a kind of multi-channel temperature measurement device；It is characterized in that：The multi-channel temperature measurement device includes：
N 4 line metallic resistance temperature sensors, n >=2, n ∈ N；
Constant-current source, the positive pole connection first of the constant-current source encourages the first of switch, three-way switch, and negative pole connection first is encouraged
Switch second, four-way switch；
First excitation switch, first, second way switch of the first excitation switch connects the input of resistor, the 3rd, the
Four-way switch connects the second current feed of each temperature sensor；
Resistor, the output end of the resistor connects the first current feed of each temperature sensor；
First amplifying circuit, the positive pole of first amplifying circuit, negative pole connect the two ends of the resistor respectively；
Second amplifying circuit, the positive pole of second amplifying circuit connects the first voltage lead of each temperature sensor, bears
Pole connects the second voltage lead of each temperature sensor；
Second excitation switch, the second excitation switch has 3n way switch, n >=2, n ∈ N, control temperature sensor and the
Break-make between one excitation switch, the second amplifying circuit；
Control circuit, control circuit control the first excitation switch and the second excitation switch；
Process circuit, the voltage U1 for the resistor that the first amplifying circuit transmission described in the processing circuit processes comesHinder i、U2Hinder i
Second amplifying circuit transmits the voltage U1 of i-th of temperature sensorPass i、U2Pass i, obtain the temperature that i-th of temperature sensor is measuredR0It is resistance of the metallic resistance at 0 degree, a is metallic resistance
Sensitivity inverse, RResistanceIt is the resistance of the resistor.
2. multi-channel temperature measurement device according to claim 1, it is characterised in that：It is described first excitation switch first,
Four-way switch is closed, other to switch off, the first amplifying circuit output U1Hinder i；With corresponding the of i-th of temperature sensor
3i, 3i-1,3i-2 switch closures of two excitation switches, other to switch off, the second amplifying circuit output U1Pass i；
Second, third way switch closure of the first excitation switch, other to switch off, the first amplifying circuit output U2Hinder i；With
3i, 3i-1,3i-2 switch closures of the corresponding second excitation switch of i-th of temperature sensor, other switches
Disconnect, the second amplifying circuit output U2Pass i, above-mentioned i=1,2,3 ... n.
3. multi-channel temperature measurement device according to claim 1, it is characterised in that：The metal is platinum.
4. multi-channel temperature measurement device according to claim 1, it is characterised in that：The multi-channel temperature measurement device enters one
Step includes：
Analog to digital conversion circuit, first amplifying circuit, the output of the second amplifying circuit send analog-digital conversion circuit as described, and modulus turns
The process circuit is sent in the output for changing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621486681.8U CN206339316U (en) | 2016-12-31 | 2016-12-31 | Multi-channel temperature measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621486681.8U CN206339316U (en) | 2016-12-31 | 2016-12-31 | Multi-channel temperature measurement device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206339316U true CN206339316U (en) | 2017-07-18 |
Family
ID=59303229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621486681.8U Withdrawn - After Issue CN206339316U (en) | 2016-12-31 | 2016-12-31 | Multi-channel temperature measurement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206339316U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840441A (en) * | 2016-12-31 | 2017-06-13 | 宁波华仪宁创智能科技有限公司 | Multi-channel temperature measurement device and method |
| CN109489853A (en) * | 2018-12-21 | 2019-03-19 | 中国船舶重工集团公司第七0七研究所 | High-precision multi-path platinum resistor temperature measuring module and method based on constant-current source |
-
2016
- 2016-12-31 CN CN201621486681.8U patent/CN206339316U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840441A (en) * | 2016-12-31 | 2017-06-13 | 宁波华仪宁创智能科技有限公司 | Multi-channel temperature measurement device and method |
| CN109489853A (en) * | 2018-12-21 | 2019-03-19 | 中国船舶重工集团公司第七0七研究所 | High-precision multi-path platinum resistor temperature measuring module and method based on constant-current source |
| CN109489853B (en) * | 2018-12-21 | 2020-11-10 | 中国船舶重工集团公司第七0七研究所 | High-precision multichannel platinum resistor temperature measurement module and method based on constant current source |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170718 Effective date of abandoning: 20230602 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170718 Effective date of abandoning: 20230602 |