CN101149403A - Method for sensing and measuring current through electric-thermal conversion and dedicated electric-thermal conversion sensor - Google Patents
Method for sensing and measuring current through electric-thermal conversion and dedicated electric-thermal conversion sensor Download PDFInfo
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- CN101149403A CN101149403A CNA2007101578019A CN200710157801A CN101149403A CN 101149403 A CN101149403 A CN 101149403A CN A2007101578019 A CNA2007101578019 A CN A2007101578019A CN 200710157801 A CN200710157801 A CN 200710157801A CN 101149403 A CN101149403 A CN 101149403A
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Abstract
A kind of method to detect the current by using the electric heating conversion sensor and the private electric heating conversion sensor, connects the electric heating conversion sensor in series in low voltage electric circuit, the said electric heating conversion sensor is compose of the metal heating unit and the thermometric component in the metal heating unit, measures the temperature of the metal heating unit by the thermometric component, sends it to the singlechip memory trough the temperature compensating circuit, the amplifier filter circuit, the data collection and A/D conversion circuit, compares with the temperature- current characteristic curve of the metal heating unit which is presaved in the memory by singlechip, gains the current value which is according to the measurement temperature value. Using this method can accomplish the measurement of the nature virtual value, this method calculates the current by measuring the heating produced by the current run trough the resistance, can get the virtual value, it will not be disturbed by the conversion of measurement period and the wave aberration, the arithmetic is simple, and the measure result is correct.
Description
Technical field
The method and the dedicated electric-thermal conversion sensor that pass through electric heating conversion sensing and measuring current that the present invention relates to use in a kind of electric parameter measurement process.
Background technology
In electric parameter measurement, the measurement of current effective value is very important.The direct value that promptly needs it need be that electric energy metrical is carried out on the basis with it again simultaneously.The sampled digital measuring method of parameters of electric power is quite general, but no matter is direct measurement, or applying electronic formula current transformer, all is by resistance sampling, obtains voltage, adopts different algorithm computation to obtain current effective value.This method changed by the measured cycle and wave form distortion is disturbed, and the measurement sampling period is difficult to determine, the algorithm complexity, thereby influence precision.
Summary of the invention
The objective of the invention is to solve the problems referred to above that prior art exists, a kind of method by electric heating conversion sensing and measuring current is provided, adopt this method can finish the measurement of effective value in essence, calculate electric current by the measurement heat that the electric current of resistance produces of flowing through, can directly obtain effective value, not disturbed by variation measuring period and wave form distortion, algorithm is simple, and measurement result is accurate.
Technical solution of the present invention is:
The electric-thermal conversion sensor of in low-voltage power line, connecting, described electric-thermal conversion sensor is to constitute by metallic heating body with attached to the temperature element on the metallic heating body, measure the temperature of metallic heating body by temperature element, through temperature-compensation circuit, amplification filtering circuit, data acquisition and A/D change-over circuit input in the single-chip microcomputer internal memory, compare processing by single-chip microcomputer and the metallic heating body temperature-current characteristics curve that is pre-existing in the memory, obtain the current value corresponding with temperature value measured.
The above-mentioned method of passing through electric heating conversion sensing and measuring current makes metallic heating body as far as possible directly contact with temperature element.
A kind of electric-thermal conversion sensor constitutes by metallic heating body with attached to the temperature element on the metallic heating body.Because metallic heating body produces heat as the existence of resistance, temperature element is attached to the temperature that can measure it on the metallic heating body.In addition, the temperature of metallic heating body will improve with the increase of electric current.
Above-mentioned electric-thermal conversion sensor, described metallic heating body are strip.
Above-mentioned electric-thermal conversion sensor, described temperature element available heat galvanic couple, thermal resistance and semiconductor temperature element.
Above-mentioned electric-thermal conversion sensor, described temperature element hinders to adopt thin film thermoelectric, and thin film thermoelectric resistance employing high temperature resistance glue bond is on metallic heating body, so that it is more abundant to conduct heat.
Above-mentioned electric-thermal conversion sensor, described temperature element adopts thermopair, two electrodes directly is welded on the metallic heating body, so that it is more abundant to conduct heat.
Advantage of the present invention is: by being connected on the measurement of the electric-thermal conversion sensor realization parameters of electric power in the low-voltage power line, because the heat transfer type between metallic heating body and the temperature element is mainly based on conduction, generally speaking, temperature of heating elements is lower than 100 ℃, and radiation heat can be ignored; Because temperature element and metallic heating body are attached together, convection heat transfer' heat-transfer by convection can't form again.Be non-linear but have monambiguity by flow through the as can be known temperature relation on electric current and metallic heating body surface of metallic heating body of test, after environment temperature is fixed or compensated automatically, can obtain electric current and temperature one-to-one relationship.Therefore in advance the electric current and the temperature characteristics of metallic heating body is input in the memory, can record temperature value by electric-thermal conversion sensor, be input in the single-chip microcomputer internal memory, with can obtain current value after the contrast of metallic heating body electric current and temperature characteristics, thereby directly obtain effective value, not disturbed by variation measuring period and wave form distortion, algorithm is simple, and measurement result is accurate.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is metallic heating body electric current-temperature static characteristic curve figure;
Fig. 3 is the structural representation (corresponding embodiment 1) of thermoelectric sensor;
Fig. 4 is the left view of Fig. 3;
Fig. 5 is the structural representation (corresponding embodiment 2) of thermoelectric sensor;
Fig. 6 is the left view of Fig. 5.
Embodiment
Embodiment 1:
As Fig. 1 and Fig. 3, shown in Figure 4, series connection electric-thermal conversion sensor 1 in low-voltage power line, described electric-thermal conversion sensor is insulcrete 103, be installed in the metallic heating body 101 on the insulcrete 103 and constitute attached to the temperature element on the metallic heating body 101 102, metallic heating body 101 is a sheet, temperature element 102 can adopt thermopair, thermal resistance and semiconductor temperature element, and the utility model is an example to adopt the thin film thermoelectric resistance.When temperature element 102 hinders for thin film thermoelectric, adopt the high temperature resistance glue bond on metallic heating body 101.Bonding between metallic heating body 101 and the temperature element 102, so that metallic heating body as far as possible directly contacts with temperature element.Because metallic heating body 101 produces heat as the existence of resistance, temperature element 102 is attached to the temperature that can measure it on the metallic heating body 101.And the temperature of metallic heating body 101 will improve with the increase of electric current.
Measure the temperature of metallic heating body by temperature element 102, process temperature-compensation circuit 2 is to solve measured value with the variation of ambient temperature skew problem, again through amplification filtering circuit 3, data acquisition and A/D change-over circuit 4, reach in single-chip microcomputer 5 internal memories, compare processing, obtain the current value corresponding by single-chip microcomputer 5 and the metallic heating body temperature-current characteristics curve (as shown in Figure 2) that is pre-stored in the memory 6 with temperature value measured.
Embodiment 2:
As Fig. 1 and Fig. 5, shown in Figure 6, series connection electric-thermal conversion sensor 1 in low-voltage power line, described electric-thermal conversion sensor 1 is by insulcrete 103, is installed in the metallic heating body 101 on the insulcrete 103 and constitutes attached to the temperature element on the metallic heating body 101 102, metallic heating body 101 is a sheet, temperature element 102 can adopt thermopair, thermal resistance and semiconductor temperature element, present embodiment is an example to adopt thermopair, two electrodes directly are welded on the metallic heating body 101, make heat transfer more abundant.Other is with embodiment 1.
Claims (7)
1. method by electric heating conversion sensing and measuring current, it is characterized in that: series connection is by electric-thermal conversion sensor (1) in low-voltage power line, described electric-thermal conversion sensor (1) is to be made of the temperature element (102) on metallic heating body (101) and the adhesion metal heater (101), measure the temperature of metallic heating body (101) by temperature element (102), through temperature-compensation circuit (2), amplification filtering circuit (3), data acquisition and A/D change-over circuit (4) input in single-chip microcomputer (5) internal memory, compare processing by single-chip microcomputer (5) and the metallic heating body temperature-current characteristics curve that is pre-existing in the memory (6), obtain the current value corresponding with temperature value measured.
2. the method by electric heating conversion sensing and measuring current according to claim 1 is characterized in that: metallic heating body (101) is as far as possible directly contacted with temperature element (102).
3. an electric-thermal conversion sensor is characterized in that: constitute by metallic heating body (101) with attached to the temperature element (102) on the metallic heating body (101).
4. electric-thermal conversion sensor according to claim 3 is characterized in that: described metallic heating body (101) is a strip.
5. electric-thermal conversion sensor according to claim 3 is characterized in that: described temperature element (102) can adopt thermopair, thermal resistance and semiconductor temperature element.
6. electric-thermal conversion sensor according to claim 5 is characterized in that: described temperature element (102) adopts the thin film thermoelectric resistance, and the thin film thermoelectric resistance adopts the high temperature resistance glue bond on metallic heating body (101).
7. electric-thermal conversion sensor according to claim 5 is characterized in that: described temperature element (102) adopts thermopair, and thermopair two electrodes directly are welded on the metallic heating body (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101578019A CN101149403A (en) | 2007-10-26 | 2007-10-26 | Method for sensing and measuring current through electric-thermal conversion and dedicated electric-thermal conversion sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101578019A CN101149403A (en) | 2007-10-26 | 2007-10-26 | Method for sensing and measuring current through electric-thermal conversion and dedicated electric-thermal conversion sensor |
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| CN101149403A true CN101149403A (en) | 2008-03-26 |
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| CNA2007101578019A Pending CN101149403A (en) | 2007-10-26 | 2007-10-26 | Method for sensing and measuring current through electric-thermal conversion and dedicated electric-thermal conversion sensor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738522B (en) * | 2008-11-20 | 2011-10-26 | 漳州国绿太阳能科技有限公司 | Control circuit for detecting alternating current and direct current by temperature comparison method |
| CN103529271A (en) * | 2013-09-26 | 2014-01-22 | 石家庄经济学院 | Optical fiber grating current sensor based on heating sheet and detection method of optical fiber grating current sensor |
| CN105814418A (en) * | 2013-12-27 | 2016-07-27 | 密克罗奇普技术公司 | Digital temperature sensor with integrated digital temperature filter |
| CN109781769A (en) * | 2019-01-03 | 2019-05-21 | 新冶高科技集团有限公司 | A kind of device and measurement method measuring graphene film thermo electric material Electrothermal Properties |
| 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 |
| CN112129987A (en) * | 2020-09-09 | 2020-12-25 | 安徽理工大学 | Amperemeter capable of working under strong magnetic field and strong electric field environment |
| CN113325358A (en) * | 2021-05-07 | 2021-08-31 | 南方电网数字电网研究院有限公司 | Method and system for rapidly detecting residual current of intelligent electric meter |
| CN116418177A (en) * | 2023-04-13 | 2023-07-11 | 哈尔滨理工大学 | Non-contact motor rotor temperature detection method based on mutual inductance principle |
-
2007
- 2007-10-26 CN CNA2007101578019A patent/CN101149403A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738522B (en) * | 2008-11-20 | 2011-10-26 | 漳州国绿太阳能科技有限公司 | Control circuit for detecting alternating current and direct current by temperature comparison method |
| CN103529271A (en) * | 2013-09-26 | 2014-01-22 | 石家庄经济学院 | Optical fiber grating current sensor based on heating sheet and detection method of optical fiber grating current sensor |
| CN105814418A (en) * | 2013-12-27 | 2016-07-27 | 密克罗奇普技术公司 | Digital temperature sensor with integrated digital temperature filter |
| CN105814418B (en) * | 2013-12-27 | 2019-03-01 | 密克罗奇普技术公司 | Digital temperature sensor with integrated digital temperature filter |
| CN109781769A (en) * | 2019-01-03 | 2019-05-21 | 新冶高科技集团有限公司 | A kind of device and measurement method measuring graphene film thermo electric material Electrothermal Properties |
| 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 |
| CN112129987A (en) * | 2020-09-09 | 2020-12-25 | 安徽理工大学 | Amperemeter capable of working under strong magnetic field and strong electric field environment |
| CN113325358A (en) * | 2021-05-07 | 2021-08-31 | 南方电网数字电网研究院有限公司 | Method and system for rapidly detecting residual current of intelligent electric meter |
| CN116418177A (en) * | 2023-04-13 | 2023-07-11 | 哈尔滨理工大学 | Non-contact motor rotor temperature detection method based on mutual inductance principle |
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Open date: 20080326 |