CN205844404U - There is under a kind of hot environment the Super-Current Measurement circuit of temperature-compensating - Google Patents
There is under a kind of hot environment the Super-Current Measurement circuit of temperature-compensating Download PDFInfo
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- CN205844404U CN205844404U CN201620763677.5U CN201620763677U CN205844404U CN 205844404 U CN205844404 U CN 205844404U CN 201620763677 U CN201620763677 U CN 201620763677U CN 205844404 U CN205844404 U CN 205844404U
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Abstract
The utility model discloses the Super-Current Measurement circuit under a kind of hot environment with temperature-compensating, including electric thermo-couple temperature measurement module, step voltage measurement module, MCU communication and ADC sampling module, RS485 transmission modular converter, power module and host computer.MCU processor of the present utility model passes through temperature and the step voltage of ADC sample port Real-time Collection conducting rod, cross-sectional dimension, step voltage distance and conducting rod temperature in conjunction with conducting rod, calculate the electric current flowing through conducting rod, and it is transferred to host computer process by RS485 chip, achieve the Super-Current Measurement technology under hot environment with temperature compensation function, improve the certainty of measurement of big electric current and measure real-time, there is the features such as data transmission is reliable, with low cost, be easily achieved.
Description
Technical field
This utility model relates to the Super-Current Measurement circuit under a kind of hot environment with temperature-compensating, belongs to big electric current and surveys
Amount technical field.
Background technology
At present, in Super-Current Measurement circuit design in high temperature environments and implementation process, temperature is not the most used to mend
Repay, or use thermocouple measurement special chip to realize temperature survey.Technique scheme there is the problem that 1, do not has temperature
Compensation causes Super-Current Measurement to miss by a mile, impact reality application；2, special chip scheme cost is high and special chip type selecting
More difficult.
Utility model content
The purpose of this utility model is, it is provided that a kind of reasonable in design, certainty of measurement is high, real-time, low cost and easily
There is under the hot environment realized the Super-Current Measurement circuit of temperature-compensating, to overcome deficiency of the prior art.
The technical solution of the utility model: there is under a kind of hot environment the Super-Current Measurement circuit of temperature-compensating, including
Electric thermo-couple temperature measurement module, step voltage measurement module, MCU communication and ADC sampling module, RS485 transmit modular converter, electricity
Source module and host computer, described MCU communication and ADC sampling module by ADC sample port respectively with galvanic couple temperature survey mould
Block and step voltage measurement module, the serial ports transmitting terminal of MCU communication simultaneously and ADC sampling module transmits modular converter with RS485
Serial ports receiving terminal be connected, RS485 transmission modular converter is connected with host computer by serial ports transmitting terminal, and power module is by voltage change
Change and supply MCU communication and ADC sampling module after High Precision Low Temperature drift voltage stabilizing.
Described electric thermo-couple temperature measurement module includes a thermocouple, 4 resistance, an operational amplifier and a temperature
Measuring IC, the two ends of thermocouple are connected with the 5th resistance and the 7th resistance respectively, the 5th be wherein connected with thermocouple positive pole
The electrode input end of another termination operational amplifier of resistance, another termination computing of the 7th resistance being connected with thermocouple negative pole
The negative input of amplifier；The outfan of operational amplifier and the 8th resistance are connected, and the other end of the 8th resistance is put with computing
The negative input of big device is connected；The electrode input end of operational amplifier and the 6th resistance are connected, the other end of the 6th resistance with
The outfan of temperature survey IC is connected.
Described step voltage measurement module includes 2 contact probes, 4 resistance and an operational amplifier, positive contact
One end of probe is connected with high-temperature electric conduction bar, and the other end and the first resistance are connected, the other end of the first resistance and operational amplifier
Electrode input end be connected；One end of cathode contact probe is connected with the 3rd resistance, the other end of the 3rd resistance and operation amplifier
The negative input of device is connected；The outfan of operational amplifier and the 4th resistance are connected, and the other end of the 4th resistance is put with computing
The negative input of big device is connected；The electrode input end of operational amplifier and the second resistance are connected, the other end of the second resistance with
GND is connected.
One ADC sample port of described MCU communication and ADC sampling module is put with the computing of electric thermo-couple temperature measurement module
Big device outfan is connected, another ADC sample port and electric thermo-couple temperature measurement module the outfan phase of temperature survey IC
Even；Meanwhile, an ADC sample port of MCU communication and ADC sampling module is defeated with the operational amplifier of step voltage measurement module
Going out end to be connected, a serial ports receiving terminal and the 9th resistance are connected, and the other end of the 9th resistance connects with RS485 transmission modular converter
Receiving end is connected, and the transmitting terminal of another serial ports is connected with the receiving terminal of RS485 transmission modular converter.
The serial ports receiving terminal of described RS485 transmission modular converter and the serial ports transmitting terminal phase of MCU communication and ADC sampling module
Even, its serial ports transmitting terminal and the 9th resistance are connected；485A, 485B and GND and a socket are connected.
The input of the LM7805 of described power module is connected with input voltage 9V, and the output 5V end of LM7805 is steady with 3.3V
The input of briquetting is connected；Filter capacitor is connected respectively to GND end at 9V voltage end, 5V voltage end and 3.3V voltage end.
Owing to using technique scheme, the utility model has the advantage of: MCU processor of the present utility model passes through
The temperature of ADC sample port Real-time Collection conducting rod and step voltage, in conjunction with cross-sectional dimension, the step voltage distance of conducting rod
And conducting rod temperature, calculate the electric current flowing through conducting rod, and be transferred to host computer process by RS485 chip, it is achieved that
There is under hot environment the Super-Current Measurement technology of temperature compensation function, improve the certainty of measurement of big electric current and measure real-time,
There is the features such as data transmission is reliable, with low cost, be easily achieved.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model；
Fig. 2 is the circuit diagram of electric thermo-couple temperature measurement module；
Fig. 3 is the circuit diagram of step voltage measurement module；
Fig. 4 is MCU communication and the circuit diagram of ADC sampling module；
Fig. 5 is the circuit diagram of RS485 transmission modular converter；
Fig. 6 is the circuit diagram of power module.
Description of reference numerals: 1-MCU communication and ADC sampling module, 2-RS485 transmits modular converter, 3-host computer, 4-electricity
Source module, 5-step voltage measurement module, 6-electric thermo-couple temperature measurement module.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawings with embodiment pair
This utility model is described in further detail.
Embodiment of the present utility model: there is under hot environment the structural representation of the Super-Current Measurement circuit of temperature-compensating
As it is shown in figure 1, include electric thermo-couple temperature measurement module 6, step voltage measurement module 5, MCU communication and ADC sampling module 1,
RS485 transmission modular converter 2, power module 4 and host computer 3, described MCU communication and ADC sampling module 1 are sampled by ADC
Port respectively with galvanic couple temperature-measuring module 6 and step voltage measurement module 5, MCU communication simultaneously and the string of ADC sampling module 1
Mouth transmitting terminal is connected with the serial ports receiving terminal of RS485 transmission modular converter 2, and RS485 transmission modular converter 2 is by serial ports transmitting terminal
Being connected with host computer 3, power module 4 supplies MCU communication and ADC sampling module after voltage transformation and High Precision Low Temperature are floated voltage stabilizing
1。
Seeing Fig. 2, described electric thermo-couple temperature measurement module 6 includes a K-type thermocouple, 4 High Precision Low Temperature drift resistance
(the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8), a low biasing Low Drift Temperature operational amplifier
An AD8629 and temperature survey chip TC1047A, the two ends of thermocouple respectively with the 5th resistance R5 and the 7th resistance R7 phase
Even, the electrode input end of another termination operational amplifier of the 5th resistance R5 being wherein connected with thermocouple positive pole, with thermocouple
The negative input of another termination operational amplifier of the 7th resistance R7 that negative pole is connected；The outfan of operational amplifier and the 8th
Resistance R8 is connected, and the other end of the 8th resistance R8 is connected with the negative input of operational amplifier；The positive pole of operational amplifier is defeated
Entering end to be connected with the 6th resistance R6, the other end of the 6th resistance R6 is connected with the outfan of temperature survey IC.Wherein resistance R5=
R7, R6=R8, constitute difference proportional amplifier with amplifier, and the outfan of temperature survey chip TC1047A provides bias voltage.Heat
The output voltage of galvanic couple temperature-measuring module 6 is:
Vt=f (△ t, Ek) * R6/R5+Vref
Vt: amplifier output voltage；
The cold and hot end temperature difference of △ t: thermocouple；
The thermo-electromotive force of Ek: thermocouple；
F (△ t, Ek): thermocouple output voltage and the determination function of temperature；
Vref: the cold junction temperature of temperature survey IC output voltage thermocouple.
Seeing Fig. 3, described step voltage measurement module 5 includes 2 step voltage contact probes, a low biasing Low Drift Temperature
Operational amplifier A D8629 and 4 High Precision Low Temperatures drift resistance (the first resistance R1, the second resistance R2, the 3rd resistance R3 and
4th resistance R4), one end of positive contact probe is connected with high-temperature electric conduction bar, and the other end and the first resistance R1 are connected, the first electricity
The other end of resistance R1 is connected with the electrode input end of operational amplifier；One end of cathode contact probe is connected with the 3rd resistance R3,
The other end of the 3rd resistance R3 is connected with the negative input of operational amplifier；The outfan of operational amplifier and the 4th resistance R4
Being connected, the other end of the 4th resistance R4 is connected with the negative input of operational amplifier；The electrode input end of operational amplifier with
Second resistance R2 is connected, and the other end of the second resistance R2 is connected with GND.Wherein resistance R1=R3, R2=R4, with low biasing low temperature
Drift operational amplifier A D8629 constitutes difference proportional amplifier.The output voltage of step voltage measurement module 5 is:
Vu=△ V*R3/R1
Vu: amplifier output voltage；
△ V: step voltage；
The ADC sample port seeing Fig. 4, described MCU communication and ADC sampling module 1 measures mould with electric thermo-couple temperature
The operational amplifier output terminal of block 6 is connected, another ADC sample port and electric thermo-couple temperature measurement module 6 temperature survey
The outfan of IC is connected；Meanwhile, an ADC sample port of MCU communication and ADC sampling module 1 and step voltage measurement module 5
Operational amplifier output terminal be connected, a serial ports receiving terminal and the 9th resistance R9 are connected, the other end of the 9th resistance R9 with
The receiving terminal of RS485 transmission modular converter 2 is connected, and the transmitting terminal of another serial ports transmits the receiving terminal of modular converter 2 with RS485
It is connected.Described MCU communication and ADC sampling module 1, by ADC sample port collecting temperature and step voltage numerical value, calculate stream
As follows through the electric current of conducting rod:
I=U/R
U=Vu/ (R3/R1) ... ... ... actual step voltage；
R=p* (1+a*t) * L/S
20 DEG C of resistivity of the room temperature of p: conducting rod；
The temperature coefficient of resistivity of a: conducting rod
The temperature of t: conducting rod
L: conducting rod step voltage measures distance；
The cross-sectional area of S: conducting rod；
See serial ports receiving terminal and MCU communication and the string of ADC sampling module 1 of Fig. 5, described RS485 transmission modular converter 2
Mouth transmitting terminal is connected, and its serial ports transmitting terminal and the 9th resistance R9 are connected；485A, 485B and GND and a socket are connected.
Seeing Fig. 6, the input of the LM7805 of described power module 4 is connected with input voltage 9V, the output 5V of LM7805
End is connected with the input of 3.3V regulator block；Connect filter capacitor respectively at 9V voltage end, 5V voltage end and 3.3V voltage end to arrive
GND end.
Claims (6)
1. there is under a hot environment Super-Current Measurement circuit of temperature-compensating, it is characterised in that: include that electric thermo-couple temperature is surveyed
Amount module (6), step voltage measurement module (5), MCU communication and ADC sampling module (1), RS485 transmission modular converter (2), electricity
Source module (4) and host computer (3), described MCU communication and ADC sampling module (1) by ADC sample port respectively with galvanic couple temperature
Degree measurement module (6) and step voltage measurement module (5), the serial ports transmitting terminal of MCU communication simultaneously and ADC sampling module (1) and
The serial ports receiving terminal of RS485 transmission modular converter (2) is connected, and RS485 transmission modular converter (2) passes through serial ports transmitting terminal with upper
Machine (3) connects, and power module (4) supplies MCU communication and ADC sampling module after voltage transformation and High Precision Low Temperature are floated voltage stabilizing
(1)。
There is under hot environment the most according to claim 1 the Super-Current Measurement circuit of temperature-compensating, it is characterised in that: institute
State electric thermo-couple temperature measurement module (6) and include a thermocouple, 4 resistance, an operational amplifier and a temperature survey IC,
The two ends of thermocouple are connected with the 5th resistance (R5) and the 7th resistance (R7) respectively, the 5th be wherein connected with thermocouple positive pole
The electrode input end of another termination operational amplifier of resistance (R5), another of the 7th resistance (R7) being connected with thermocouple negative pole
The negative input of termination operational amplifier；The outfan of operational amplifier and the 8th resistance (R8) are connected, the 8th resistance (R8)
The other end be connected with the negative input of operational amplifier；The electrode input end of operational amplifier and the 6th resistance (R6) phase
Even, the other end of the 6th resistance (R6) is connected with the outfan of temperature survey IC.
There is under hot environment the most according to claim 1 the Super-Current Measurement circuit of temperature-compensating, it is characterised in that: institute
State step voltage measurement module (5) and include 2 contact probes, 4 resistance and an operational amplifier, the one of positive contact probe
End is connected with high-temperature electric conduction bar, and the other end and the first resistance (R1) are connected, the other end of the first resistance (R1) and operational amplifier
Electrode input end be connected；One end of cathode contact probe is connected with the 3rd resistance (R3), the other end of the 3rd resistance (R3) with
The negative input of operational amplifier is connected；The outfan of operational amplifier and the 4th resistance (R4) are connected, the 4th resistance (R4)
The other end be connected with the negative input of operational amplifier；The electrode input end of operational amplifier and the second resistance (R2) phase
Even, the other end of the second resistance (R2) is connected with GND.
There is under hot environment the most according to claim 1 the Super-Current Measurement circuit of temperature-compensating, it is characterised in that: institute
State an ADC sample port of MCU communication and ADC sampling module (1) and the operational amplifier of electric thermo-couple temperature measurement module (6)
Outfan is connected, another ADC sample port and electric thermo-couple temperature measurement module (6) the outfan phase of temperature survey IC
Even；Meanwhile, an ADC sample port of MCU communication and ADC sampling module (1) is put with the computing of step voltage measurement module (5)
Big device outfan is connected, and a serial ports receiving terminal and the 9th resistance (R9) are connected, and the other end of the 9th resistance (R9) passes with RS485
The receiving terminal of defeated modular converter (2) is connected, and the transmitting terminal of another serial ports transmits the receiving terminal phase of modular converter (2) with RS485
Even.
There is under hot environment the most according to claim 1 the Super-Current Measurement circuit of temperature-compensating, it is characterised in that: institute
The serial ports receiving terminal stating RS485 transmission modular converter (2) is connected with the serial ports transmitting terminal of MCU communication and ADC sampling module (1),
Its serial ports transmitting terminal and the 9th resistance (R9) are connected；485A, 485B and GND and a socket are connected.
There is under hot environment the most according to claim 1 the Super-Current Measurement circuit of temperature-compensating, it is characterised in that: institute
The input of the LM7805 stating power module (4) is connected with input voltage 9V, the output 5V end of LM7805 and 3.3V regulator block
Input is connected；Filter capacitor is connected respectively to GND end at 9V voltage end, 5V voltage end and 3.3V voltage end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620763677.5U CN205844404U (en) | 2016-07-21 | 2016-07-21 | There is under a kind of hot environment the Super-Current Measurement circuit of temperature-compensating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620763677.5U CN205844404U (en) | 2016-07-21 | 2016-07-21 | There is under a kind of hot environment the Super-Current Measurement circuit of temperature-compensating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205844404U true CN205844404U (en) | 2016-12-28 |
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ID=57625325
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620763677.5U Expired - Fee Related CN205844404U (en) | 2016-07-21 | 2016-07-21 | There is under a kind of hot environment the Super-Current Measurement circuit of temperature-compensating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655654A (en) * | 2019-01-16 | 2019-04-19 | 江苏其厚智能电气设备有限公司 | A kind of Super-Current Measurement method and device based on by-pass shunt technology |
-
2016
- 2016-07-21 CN CN201620763677.5U patent/CN205844404U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655654A (en) * | 2019-01-16 | 2019-04-19 | 江苏其厚智能电气设备有限公司 | A kind of Super-Current Measurement method and device based on by-pass shunt technology |
| CN109655654B (en) * | 2019-01-16 | 2023-10-20 | 江苏其厚智能电气设备有限公司 | High-current measurement method and device based on bypass shunt technology |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161228 Termination date: 20170721 |
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| CF01 | Termination of patent right due to non-payment of annual fee |