CN206960534U - A kind of temperature survey and compensation device for high precision electro flow measuring instrument - Google Patents
A kind of temperature survey and compensation device for high precision electro flow measuring instrument Download PDFInfo
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- CN206960534U CN206960534U CN201720867844.5U CN201720867844U CN206960534U CN 206960534 U CN206960534 U CN 206960534U CN 201720867844 U CN201720867844 U CN 201720867844U CN 206960534 U CN206960534 U CN 206960534U
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- temperature
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Abstract
A kind of temperature survey and compensation device for high precision electro flow measuring instrument, it includes I V modular converters and the temperature measurement unit for detecting I V modular converter temperature, I V modular converters and temperature measurement unit are electrically connected in calculation process and compensating module, and the calculation process and compensating module are also associated with display module；The first signal conditioning circuit and the first A/D change-over circuits have been sequentially connected electrically between temperature measurement unit and calculation process and compensating module；Secondary signal modulate circuit and the 2nd A/D change-over circuits have been sequentially connected electrically between I V modular converters and calculation process and compensating module.Utility model works are reliable and stable, compensation effect is good, compensation temperature range is wide, response quickly, the advantages that precision is high, reliable and accurate temperature-compensating can be provided for high precision electro flow gauge, current divider I V Switching Cores temperature changes are greatly reduced to bringing change in resistance to cause the inaccurate influence of measurement, so as to improve the degree of accuracy of current measurement and stability.
Description
Technical field
Current measurement techniques are the utility model is related to, more particularly to a kind of temperature for high precision electro flow measuring instrument is surveyed
Amount and compensation device.
Background technology
It is the main stream approach currently used for ac and dc current accurate measurement that current divider, which surveys current method, and the principle of current divider method is simple
It is single, in the measurement of direct current and alternating low frequency rate electric current, show the high degree of accuracy and faster response speed；Traditional
Field of current measurement, as long as not being related to the occasion being electrically isolated between measuring loop and tested electric current, current divider method is accurate electricity
The preferred version of flow measurement.
Current divider survey current method measuring principle be actually I-V electric current converted measurement principles, i.e., when tested electric current from divide
Leakage resistance I-V core devices upstream is out-of-date, is measured in the voltage sample portvoltage of I-V Switching Core devices, due to
Know the resistance size of I-V Switching Cores, thus can directly calculate the virtual value of tested electric current, its institute of measuring principle below figure 1
Show.
It is at present the shortcomings that current divider survey current method, after electric current flows through I-V Switching Cores, I-V Switching Cores will continue
Heating, the aggregation of constantly cumulative heat are difficult to rapid dispersion, I-V Switching Core temperature rapid increases, cause I-V Switching Cores
Impedance magnitude changes, and therefore the voltage of voltage sampling port also changes, cause the accuracy of measurement of electric current to be difficult to improve.
In addition, the resistance that the change of ambient temperature also leads to I-V Switching Cores changes, the accuracy of measurement of electric current is again resulted in
It is difficult to improve.
Resistance change situation caused by I-V Switching Core spontaneous heatings when power coefficient is used to characterize high power load, has
Uneven, hot-spot phenomenon is loaded to produce.If the power coefficient of I-V Switching Cores is big, after heating, core devices are in itself
The change of resistance value is big, precision current measurement is had a huge impact, therefore power coefficient is the smaller the better.
Temperature coefficient is that ambient temperature change causes to change caused by I-V Switching Core device resistances value.Outside due to instrument
The fluctuation range of the temperature environment in portion is bigger, influence of the change in resistance to current measurement caused by the temperature coefficient of core devices
Also it is bigger.The current divider of 10ppm temperatures coefficient is such as used, is demarcated in 20 DEG C of environment, will be produced when using for 30 DEG C
100ppm deviation.Therefore temperature coefficient is also the smaller the better.
The temperature-compensating major programme that industry is directed to the I-V Switching Cores for being used for precision current measurement at present is to pass through hardware
Analog circuit compensates, i.e., it is entered using the thermistor with opposite temperature coefficients on I-V Switching Cores
Trip temperature compensates；The problem of compensation scheme, is, due to the intrinsic I-V characteristic of component, the temperature coefficient of every kind of component
All it is unique, can not possibly be done for the thermistor of compensation and the temperature coefficient of the I-V Switching Core devices compensated
It is essentially equal to size, i.e., it can not accomplish compensation in full temperature range.The temperature coefficient of two kinds of different components may be widely different,
Within the scope of wider temperature, it is easy to cause undercompensation or overcompensation.Therefore, can only be limited one using such a scheme
In segment temperature range, it is little to be approximately considered temperature coefficient differences, can realize relative compensation purpose.Disadvantages mentioned above determines,
The compensation precision of the first compensation scheme can not possibly be very high, it is difficult to realizes the purpose of high accuracy electric current accurate measurement.
Utility model content
The purpose of this utility model is to provide a kind of temperature survey for high precision electro flow measuring instrument and compensation device,
It has the characteristics of stable and reliable in work, measurement accuracy is high and compensation effect is good.
The utility model is achieved like this, a kind of temperature survey and compensation dress for high precision electro flow measuring instrument
Put, it is characterised in that it includes I-V modular converters and the temperature measurement unit for detecting I-V modular converter temperature, I-V
Modular converter and temperature measurement unit are electrically connected in calculation process and compensating module, and the calculation process and compensating module also connect
It is connected to display module.
The first signal conditioning circuit has been sequentially connected electrically between the temperature measurement unit and calculation process and compensating module
With the first A/D change-over circuits.
Be sequentially connected electrically between the I-V modular converters and calculation process and compensating module secondary signal modulate circuit and
2nd A/D change-over circuits.
Preferably：The temperature measurement unit is platinum resistance temperature sensor, and the platinum resistance temperature sensor is close to
On the radiator of I-V modular converters.
First signal conditioning circuit and secondary signal modulate circuit include bridge measuring circuit and amplifying circuit.
RMS-DC converter circuit is additionally provided between the secondary signal modulate circuit and the 2nd A/D change-over circuits and filtering is slow
Rush device.
Preferably：The 2nd A/D change-over circuits also include respectively being digitized combined-voltage analog signal
The switching switch of sampling.The calculation process and compensating module are MCU.
The beneficial effects of the utility model are：The utility model utilizes more to I-V modular converters using temperature measurement unit
Point accurate measurement, is compensated using data are detected to the resistance of I-V Switching Cores；Whole temperature survey and compensation device work
It is reliable and stable, there is the advantages that measurement accuracy is high, and compensation effect is good, and compensation temperature range is wide, response quickly, can be high accuracy
Current measuring instrument is provided reliably with accurate temperature-compensating, greatly reduces current divider I-V Switching Core temperature changes to bringing
Change in resistance causes the inaccurate influence of measurement, so as to greatly improve the degree of accuracy of current measurement and stability.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams that existing current divider method carries out current measurement.
Fig. 2 is the utility model overall structure block diagram.
Fig. 3 is the circuit connection structure block diagram in the utility model specific implementation process.
Embodiment
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings.
As shown in figure 1, the utility model is achieved like this, this is used for the temperature survey of high precision electro flow measuring instrument
And compensation device includes I-V modular converters and the temperature measurement unit for detecting I-V modular converter temperature, I-V moduluss of conversion
Block and temperature measurement unit are electrically connected in calculation process and compensating module, and the calculation process and compensating module are also associated with showing
Show module；The utility model detects the temperature of I-V modular converters by temperature measurement unit in real time, and by the temperature signal and
The signal real-time delivery of I-V modular converters is changed to calculation process and compensating module by calculation process and compensating module according to-V
The resistance of module core compensates, using temperature measurement unit to I-V modular converter multiple spot accurate measurements, using detecting data
The resistance of I-V Switching Cores is compensated, directly displays current value eventually through digital display circuit, the utility model is fine
Ground solves the I-V Switching Cores device for high precision electro flow measurement because temperature change causes change in resistance to cause measurement not
The problem of accurate, improve the precision using current divider method measurement electric current.
Before work is modified to the measurement result of electric current using real time temperature data, first have to I-V moduluss of conversion
The temperature coefficient of block is studied, the temperature coefficient of accurate measurement and analysis I-V modular converters.The resistance value of I-V modular converters
Change with the change of temperature, referred to as the temperature effect of device, the temperature of environment is continually changing；And temperature one becomes, electricity
Resistance just and then becomes, and accurate measurement can not be just normally carried out., it is necessary to grant I-V modular converter rated current in practical operation
For a period of time, under the premise of reaching thermally equilibrated after abundant self-heating, by temperature measurement unit to the big of multiple equalized temperature points
Examination is measured, and the temperature signal is passed into calculation process and compensating module, I-V conversions are compared by calculation process and compensating module
Blocks current signal accurate Drawing goes out temperature-resistance curve map of the I-V modular converters of real fitting actual conditions, and according to
The curve map adjusts penalty coefficient, you can carries out artificial compensation to temperature-resistance curve.In practical operation, due to temperature-resistance
It is worth the measurement error of curve and the refinement error of adjustment penalty coefficient, therefore it is impossible to carry out that amendment is fully compensated, but can
With the irrelevance for significantly reducing and correcting resistance, make I-V Switching Cores device temperature-resistance curve close in ideal
Temperature-resistance curve, so as to reduce and reduce influence of the temperature change for accuracy of measurement.
In order to preferably meet actual measurement and compensation needs, the compensation scheme of relatively reliable stabilization is obtained, this practicality is new
Type has also carried out Curve guide impeller to the details of the technical scheme, and structure is embodied as shown in Fig. 2 the temperature measurement unit in it
The first signal conditioning circuit and the first A/D change-over circuits have been sequentially connected electrically between calculation process and compensating module.The I-V
Secondary signal modulate circuit and the 2nd A/D conversion electricity have been sequentially connected electrically between modular converter and calculation process and compensating module
Road；The temperature measurement unit is using the platinum resistance temperature sensor being close on the radiator of I-V modular converters, calculation process
And compensating module is MCU, the temperature change of I-V modular converters is sent to the first signal conditioning circuit for realizing；First signal
Modulate circuit is that the bridge measuring circuit that is made up of precision resistance and precise amplifying circuit are formed, and is exported by bridge measuring circuit
Faint voltage signal, completing zeroing and amplification by precise amplifying circuit makes it meet that the amplitude of the first A/D change-over circuits will
Ask；First A/D change-over circuits are used for realizing that converting analog signals into data signal is sent to MCU progress data acquisitions；I-V is changed
The I-V change-over circuits of module make current signal be converted to voltage signal, and the analog sampling voltage signal of output passes through secondary signal
Amplifier in modulate circuit is amplified, and then tells alternating current-direct current signal；Ac voltage signal enters RMS-DC converter electricity
Road enters filtered buffer after carrying out RMS conversion；D. c. voltage signal is directly entered filtered buffer.2nd A/D is changed
Circuit carries out high-speed digitization sampling to combined-voltage analog signal respectively by switching switch, is then sent to data signal
MCU carries out data acquisition；MCU is fitted the resistance of the I-V modular converters obtained by measuring according to the temperature data gathered in real time
Value-temperature curve, processing is compensated to resistance (voltage signal), and display module is given obtained result；Digital-scroll technique
Module shows final result.
Temperature survey and compensation device based on said structure, when actually implementing, in order to improve the precision of measurement compensation,
The experiment module such as current divider, radiator and measuring circuit plate of different ranges in operation, it is necessary to first be placed on by the device respectively
In standard laboratory atmosphere, be powered preheating 4h；Then lead to the rated current of upper corresponding range, keep 30min, current divider will be by
Thermal balance is gradually warming up to, then electric current is slowly decreased to the half of rated value, keeps 30min, waits current divider to be again introduced into
Thermal balance, electric current is then slowly increased again, slowly reduce electric current, such loop test 5 times.Record within every 30 seconds in this overall process
One data point, so as to obtain resistance-thermographic data of a large amount of each range I-V Switching Cores, then to mutually synthermal
The resistance data of point are handled using arithmetic mean of instantaneous value, have just obtained the average characteristics figure of resistance-temperature of I-V Switching Cores, this
, then can be accurate by a large amount of tests and calculating of multiple equalized temperature points under the premise of sample reaches thermally equilibrated after abundant self-heating
Temperature-resistance curve map of the I-V Switching Core devices of real fitting actual conditions is drawn out, is realized bent to temperature-resistance
Line carries out artificial compensation, reaches the purpose of high precision electro flow measurement.
Claims (8)
1. a kind of temperature survey and compensation device for high precision electro flow measuring instrument, it is characterised in that it is changed including I-V
Module and the temperature measurement unit for detecting I-V modular converter temperature, I-V modular converters and temperature measurement unit are electric respectively
Calculation process and compensating module are connected to, the calculation process and compensating module are also associated with display module.
2. the temperature survey for high precision electro flow measuring instrument and compensation device as claimed in claim 1, it is characterised in that institute
State and the first signal conditioning circuit and the first A/D turns have been sequentially connected electrically between temperature measurement unit and calculation process and compensating module
Change circuit.
3. the temperature survey for high precision electro flow measuring instrument and compensation device as claimed in claim 2, it is characterised in that institute
State and secondary signal modulate circuit and the 2nd A/D turns have been sequentially connected electrically between I-V modular converters and calculation process and compensating module
Change circuit.
4. the temperature survey for high precision electro flow measuring instrument and compensation device as claimed in claim 3, it is characterised in that institute
It is platinum resistance temperature sensor to state temperature measurement unit, and the platinum resistance temperature sensor is close to the radiator of I-V modular converters
On.
5. the temperature survey for high precision electro flow measuring instrument and compensation device as claimed in claim 4, it is characterised in that institute
Stating the first signal conditioning circuit and secondary signal modulate circuit includes bridge measuring circuit and amplifying circuit.
6. the temperature survey for high precision electro flow measuring instrument and compensation device as claimed in claim 5, it is characterised in that institute
State and be additionally provided with RMS-DC converter circuit and filtered buffer between secondary signal modulate circuit and the 2nd A/D change-over circuits.
7. the temperature survey for high precision electro flow measuring instrument and compensation device as claimed in claim 6, it is characterised in that institute
State the switching switch that the 2nd A/D change-over circuits also include respectively being digitized combined-voltage analog signal sampling.
8. the temperature survey for high precision electro flow measuring instrument and compensation device as described in any one in claim 1-7,
Characterized in that, the calculation process and compensating module are MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720867844.5U CN206960534U (en) | 2017-07-18 | 2017-07-18 | A kind of temperature survey and compensation device for high precision electro flow measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720867844.5U CN206960534U (en) | 2017-07-18 | 2017-07-18 | A kind of temperature survey and compensation device for high precision electro flow measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206960534U true CN206960534U (en) | 2018-02-02 |
Family
ID=61383782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720867844.5U Expired - Fee Related CN206960534U (en) | 2017-07-18 | 2017-07-18 | A kind of temperature survey and compensation device for high precision electro flow measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206960534U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146739A (en) * | 2019-06-21 | 2019-08-20 | 沃尔特电子（苏州）有限公司 | A kind of power-measuring device and method |
| CN113447693A (en) * | 2021-05-27 | 2021-09-28 | 蚌埠市双环电子集团股份有限公司 | Current detection splitter for new energy automobile battery management system |
-
2017
- 2017-07-18 CN CN201720867844.5U patent/CN206960534U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146739A (en) * | 2019-06-21 | 2019-08-20 | 沃尔特电子（苏州）有限公司 | A kind of power-measuring device and method |
| CN113447693A (en) * | 2021-05-27 | 2021-09-28 | 蚌埠市双环电子集团股份有限公司 | Current detection splitter for new energy automobile battery management system |
| CN113447693B (en) * | 2021-05-27 | 2022-03-29 | 蚌埠市双环电子集团股份有限公司 | Current detection splitter for new energy automobile battery management system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180202 Termination date: 20190718 |
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| CF01 | Termination of patent right due to non-payment of annual fee |