CN104977459A - Current detection device, electric energy meter made by device and metering method thereof - Google Patents
Current detection device, electric energy meter made by device and metering method thereof Download PDFInfo
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- CN104977459A CN104977459A CN201510414443.XA CN201510414443A CN104977459A CN 104977459 A CN104977459 A CN 104977459A CN 201510414443 A CN201510414443 A CN 201510414443A CN 104977459 A CN104977459 A CN 104977459A
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Abstract
The invention discloses a current detection device, an electric energy meter made by the device and a metering method thereof. The current detection device comprises a current detection module and a management chip, wherein the current detection module comprises a double-range Hall sensor and a double-range Hall sensor output selection circuit, the input end of the double-range Hall sensor is connected with a detected current and the output end is connected with the double-range Hall sensor output selection circuit, the output end of the double-range Hall sensor output selection circuit is connected with the management chip, and the control end of the double-range Hall sensor output selection circuit is connected with the management chip. According to the electric energy meter metering method, metering parameters and a metering sensor can be automatically selected according to magnitude of the detected current. According to the current detection device, the current detection range is expanded, the detection precision is improved, and applicability and scalability are good. The electric energy meter current detection range is wide, the electric energy metering precision is high, and the metering method is applied to various double-sensor metering conditions, and the application range is wide.
Description
Technical field
The electric energy meter that the present invention relates to a kind of current sensing means and make with this device and metering method thereof.
Background technology
At present, current detecting adopts Current Transmit, manganese copper diverter or special current sampling circuit to complete the sampling work of electric current usually.
In electric-power metering field, when current sample employing Current Transmit or manganese copper diverter, current sample method is concrete as shown in Figure 1: after live wire electric current, neutral line current sample respectively through manganese copper diverter, neutral line current mutual inductor CT, computation chip is entered through Anti-aliasing Filter Circuits, in computation chip after the process such as ADC sampling, filtering process, various instantaneous or effective measured value is obtained, as electric current, power etc. by corresponding a set of calculating parameter (as live wire electric current reduction coefficient, live wire power conversion coefficient and live wire energy threshold etc.) computing.But Current Transmit exists the saturated and narrower problem of bandwidth of magnetic core, and there is the problems such as heating and electrical isolation in manganese copper diverter when signal is larger.Although Hall element does not exist the problems referred to above, and have direct current measurement function, when single Hall element detects, dynamic range is narrower, and the range of current of measurement is limited.In addition, most of current sampling device all adopts single-sensor (single current transformer or single manganese copper diverter) to sample a certain road electric quantity signal (voltage or electric current), and the measurement range of single-sensor is limited.
Adopt special current sampling circuit, often need to design different current sampling circuits for different tested current classes, single current sampling circuit range of application is very limited.
Summary of the invention
An object of the present invention is to provide the current sensing means that a kind of measurement range is wide, measuring accuracy is high, applicability is wide.
Two of object of the present invention is to provide the electric energy meter that measurement range is wide, precision is high.
Three of object of the present invention is the metering method by providing a kind of described electric energy meter.
This current sensing means provided by the invention, comprise current detection module and managing chip, current detection module comprises double-range Hall element and double-range Hall element output select circuit, the input end of double-range Hall element is connected with tested electric current, output terminal is connected with double-range Hall element output select circuit, the output terminal of double-range Hall element output select circuit is connected with managing chip, and the control end of double-range Hall element output select circuit is connected with managing chip simultaneously.
Described managing chip is the managing chip with D/A translation function.
Described current sensing means also comprises computation chip, and computation chip is connected between double-range Hall element output select circuit and managing chip.
Described current sensing means also comprises filtering circuit, after filtering circuit is connected on double-range Hall element output select circuit, carries out signal filtering process for the module connected for rear end.
Described double-range Hall element comprises wide range Hall element and small-range Hall element.
Described double-range Hall element output select circuit comprises two switching tubes and corresponding switching tube driver module, I/O pin the opening and shutoff by switching tube driver module gauge tap pipe of managing chip, the two-way of double-range Hall sensor module exports respectively by output signal after switching tube to the filtering circuit of rear stage.
Described double-range Hall element comprises U-shaped electric current guide rail, U-shaped pcb board, mounting hole, small-range Hall current sensor and wide range Hall current sensor, U-shaped pcb board is close to above U-shaped electric current guide rail, U-shaped electric current guide rail is connected in series with line of electric force by mounting hole, produces magnetic field, is integrated in small-range Hall current sensor on U-shaped PCB and wide range current sensor and produces output voltage respectively by the induced electricity line of force raw magnetic field of miscarriage that powers on.
When the switching tube of described double-range Hall element output select circuit and corresponding switching tube driver module adopt triode and corresponding driving circuit, the I/O pin of managing chip is connected to the base stage of a NPN triode by the first resistance, the emitter of NPN triode is connected to ground, the collector of NPN triode is connected with the base stage of a PNP triode by the second resistance, one tunnel output signal of double-range Hall sensor module is connected to the emitter of PNP triode by the 3rd resistance, the current collection very signal output part of PNP triode, connect the filtering circuit of rear stage, another road output signal of double-range Hall sensor module connects the filtering circuit of rear stage by same circuit.
This electric energy meter provided by the invention makes with above-mentioned current sensing means.The metering method of this electric energy meter, comprises the following steps:
1) computation chip reads the corresponding configuration parameter of small-range sensor;
2) control port of small-range sensor and output loop are opened, the control port of sensors of large measurement range and output loop are closed, makes the output signal of small-range sensor enter computation chip;
3) calculating parameter calculating current and the power of corresponding supporting small-range sensor is adopted;
4) often at regular intervals, carry out the judgement of current value: if the current value measured is greater than the threshold value of setting, enters step 5), otherwise enter small-range quantitative model, repeat step 4);
5) computation chip reads the corresponding configuration parameter of sensors of large measurement range;
6) control port of sensors of large measurement range and output loop are opened, the control port of small-range sensor and output loop are closed, makes the output signal of sensors of large measurement range enter computation chip;
7) calculating parameter calculating current and the power of corresponding supporting sensors of large measurement range is adopted;
8) often at regular intervals, carry out the judgement of current value: if the current value measured is less than the threshold value of setting, enters step 1), otherwise enter wide range quantitative model, repeat step 8).
Current sensing means of the present invention, due to the measurement adopting double-range Hall element to carry out electric current, compensate for Current Transmit and there is the problem that magnetic core is saturated and bandwidth is narrower, problem and the current sampling circuit narrow application range of heating and electrical isolation is there is in manganese copper diverter when signal is larger, the problems such as circuit is complicated, front end adopts double-range Hall element testing circuit and rear end to adopt corresponding double parameter measuring method, expand current measuring range, improve measuring accuracy, dual-Hall sensor and corresponding output select circuit circuit simple, it is convenient to realize, its applicability and favorable expandability.The present invention is applicable to the instrument and meter that the various occasion or need needing to carry out current detecting detects electric current, as the current detecting of electric system, the charging current detection, electric energy meter, reometer etc. of accumulator.
The electric energy meter made with above-mentioned current sensing means provided by the invention, effectively can improve the precision of electrical energy meter electricity flow measurement and the precision of electric energy metrical.
The metering method of the electric energy meter made with above-mentioned current sensing means provided by the invention, can according to the size of surveyed electric current, the output of automatic selection sensor, the switching automatically transferred corresponding measuring parameter, automatically carry out range, ensure that high measurement accuracy and the Wide measuring range of electric energy metrical, method is simple, practical, the occasion of dual sensor metering electric energy can be widely used in, as the electric energy metrical occasion of two electric power mutual-inductor, the electric energy metrical occasion etc. of single electric power mutual-inductor list manganese copper diverter.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of prior art.
Fig. 2 is the functional block diagram of current sensing means of the present invention.
Fig. 3 is the structural representation of double-range Hall element of the present invention.
Fig. 4 is the functional block diagram of double-range Hall element output select circuit of the present invention.
Fig. 5 is the circuit theory diagrams of double-range Hall element output select circuit of the present invention.
Fig. 6 is the functional block diagram of electric energy meter of the present invention.
Fig. 7 is the two-parameter metering method Software for Design process flow diagram of electric energy meter of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed.
Fig. 2 ~ Fig. 5 is the explanation accompanying drawing of current sensing means provided by the invention.
Be illustrated in figure 2 the functional block diagram of current sensing means provided by the invention; Electric power pick-up unit comprises current detection module and managing chip, current detection module comprises double-range Hall element and double-range Hall element output select circuit, the input end of double-range Hall element is connected with tested electric current, output terminal is connected with double-range Hall element output select circuit, the output terminal of double-range Hall element output select circuit is connected with managing chip, and the control end of double-range Hall element output select circuit is connected with managing chip simultaneously.
Be illustrated in figure 3 double-range Hall element structural representation of the present invention; Double-range Hall element is by U-shaped electric current guide rail, U-shaped pcb board 11, mounting hole 12 on pcb board, small-range Hall element 13, wide range Hall element 14 forms, and wherein U-shaped pcb board 11 is close to above U-shaped electric current guide rail, and U-shaped electric current guide rail is connected in series with line of electric force by mounting hole, produce magnetic field, be integrated in small-range Hall element 13 on U-shaped pcb board 11 and sensors of large measurement range 14 and produce output voltage OUT1 and OUT2 respectively by the induced electricity line of force raw magnetic field of miscarriage that powers on.Large and small range Hall element is protected by respective radome, prevent each other with the magnetic interference in the external world.
As Fig. 4 ~ 5 are depicted as the functional block diagram of double-range Hall element output select circuit of the present invention and a kind of circuit theory diagrams of embodiment, double-range Hall element output select circuit comprises two switching tubes and corresponding switching tube driver module and a slice managing chip, I/O pin the turning on and off by switching tube driver module gauge tap pipe of managing chip, the two-way of double-range Hall sensor module exports respectively by output signal after switching tube to the filtering circuit of rear stage, when switching tube and switching tube driver module adopt triode and corresponding driving circuit, physical circuit is as shown in Figure 5: for a road output signal of double-range Hall element, the I/O pin of managing chip is connected to the base stage of a NPN triode by the first resistance, the emitter of NPN triode is connected to ground, the collector of NPN triode is connected with the base stage of a PNP triode by the second resistance, one tunnel output signal of double-range Hall sensor module is connected to the emitter of PNP triode by the 3rd resistance, the current collection very signal output part of PNP triode, connect the filtering circuit of rear stage, another road output signal of double-range Hall element is connected to the filtering circuit of rear stage by same circuit.
Be illustrated in figure 6 the functional block diagram of the electric energy meter that applied current pick-up unit provided by the invention is made; Current detection module is for detecting the electric current of live wire on line of electric force, and the output of current detection module is connected to computation chip by filtering circuit 1, and the control end of double-range Hall element output select circuit is connected with the I/O pin of managing chip.
Be illustrated in figure 7 the two-parameter metering method Software for Design process flow diagram of electric energy meter of the present invention, comprise the following steps:
1.. the write corresponding supporting configuration parameter of small-range (as small-range live wire shunt running threshold value, small-range live wire ratio register, small-range live wire energy threshold etc.) is to computation chip;
2.. small-range output control terminal mouth P45 is put 1, by wide range control output end mouth P46 clear 0, opens small-range and export, close wide range and export, make the output of small-range Hall element enter into computation chip after Anti-aliasing Filter Circuits;
3.. adopt corresponding supporting small-range Hall element calculating parameter (as small-range live wire electric current reduction coefficient, small-range live wire power conversion coefficient etc.) to calculate live wire electric current and live wire power;
4.. timer adds 1 and the 1 second time of waiting timer arrives, and now carries out the judgement of live wire current value.If the current value measured is greater than the threshold value of setting, enter step 5.If the current value measured is not more than the threshold value of setting, then enter small-range quantitative model, subsequently timer clear 0, repeat step 4;
5.. the write corresponding supporting configuration parameter of wide range Hall element (as wide range live wire shunt running threshold value, wide range live wire ratio register, wide range live wire energy threshold etc.) is to computation chip;
6.. by small-range output control terminal mouth P45 clear 0, wide range control output end mouth P46 is put 1, close small-range and export, open wide range and export, make the output of wide range Hall element enter into computation chip after Anti-aliasing Filter Circuits;
7.. adopt corresponding supporting wide range calculating parameter (as wide range live wire electric current reduction coefficient, wide range live wire power conversion coefficient etc.) to calculate live wire electric current and live wire power;
8.. timer continues to add 1 and the 1 second time of waiting timer arrives, and now carries out the judgement of live wire current value.If the current value measured is less than the threshold value of setting, enter step 1.If the current value measured is not less than the threshold value of setting, then enter wide range quantitative model, subsequently timer clear 0, repeat step 8.
Claims (10)
1. a current sensing means, comprise current detection module and managing chip, it is characterized in that current detection module comprises double-range Hall element and double-range Hall element output select circuit, the input end of double-range Hall element is connected with tested electric current, output terminal is connected with double-range Hall element output select circuit, the output terminal of double-range Hall element output select circuit is connected with managing chip, and the control end of double-range Hall element output select circuit is connected with managing chip simultaneously.
2. current sensing means according to claim 1, is characterized in that described managing chip is the managing chip with D/A translation function.
3. current sensing means according to claim 1, it is characterized in that described current sensing means also comprises computation chip, computation chip is connected between double-range Hall element output select circuit and managing chip.
4. current sensing means according to claim 1, it is characterized in that described current sensing means also comprises filtering circuit, filtering circuit is connected between double-range sensor output select circuit and managing chip.
5. current sensing means according to claim 1, is characterized in that described double-range Hall element comprises wide range Hall element and small-range Hall element.
6. the current sensing means according to claim 1 and 2, it is characterized in that described double-range Hall element output select circuit comprises two switching tubes and corresponding switching tube driver module, I/O pin the opening and shutoff by switching tube driver module gauge tap pipe of managing chip, the two-way of double-range Hall sensor module exports respectively by output signal after switching tube to the filtering circuit of rear stage.
7. the current sensing means according to claim 1 and 2, it is characterized in that described double-range Hall element comprises U-shaped electric current guide rail, U-shaped pcb board, mounting hole, small-range Hall current sensor and wide range Hall current sensor, U-shaped pcb board is close to above U-shaped electric current guide rail, U-shaped electric current guide rail is connected in series with line of electric force by mounting hole, produce magnetic field, be integrated in small-range Hall current sensor on U-shaped PCB and wide range current sensor and produce output voltage respectively by the induced electricity line of force raw magnetic field of miscarriage that powers on.
8. according to the current sensing means one of claim 1 ~ 3 Suo Shu, when it is characterized in that the switching tube of described double-range Hall element output select circuit and corresponding switching tube driver module adopt triode and corresponding driving circuit, the I/O pin of managing chip is connected to the base stage of a NPN triode by the first resistance, the emitter of NPN triode is connected to ground, the collector of NPN triode is connected with the base stage of a PNP triode by the second resistance, one tunnel output signal of double-range Hall sensor module is connected to the emitter of PNP triode by the 3rd resistance, the current collection very signal output part of PNP triode, connect the filtering circuit of rear stage, another road output signal of double-range Hall sensor module connects the filtering circuit of rear stage by same circuit.
9. the electric energy meter be made up of the described current sensing means of one of claim 1 ~ 8.
10. an electric energy gauging method for electric energy meter described in claim 9, comprises the following steps:
1) computation chip reads the corresponding configuration parameter of small-range sensor;
2) control port of small-range sensor and output loop are opened, the control port of sensors of large measurement range and output loop are closed, makes the output signal of small-range sensor enter computation chip;
3) calculating parameter calculating current and the power of corresponding supporting small-range sensor is adopted;
4) often at regular intervals, carry out the judgement of current value: if the current value measured is greater than the threshold value of setting, enters step 5), otherwise enter small-range quantitative model, repeat step 4);
5) computation chip reads the corresponding configuration parameter of sensors of large measurement range;
6) control port of sensors of large measurement range and output loop are opened, the control port of small-range sensor and output loop are closed, makes the output signal of sensors of large measurement range enter computation chip;
7) calculating parameter calculating current and the power of corresponding supporting sensors of large measurement range is adopted;
8) often at regular intervals, carry out the judgement of current value: if the current value measured is less than the threshold value of setting, enters step 1), otherwise enter wide range quantitative model, repeat step 8).
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891591A (en) * | 2016-04-08 | 2016-08-24 | 北京精密机电控制设备研究所 | Large-power energy-storage inverter current detection and control system |
| CN107238410A (en) * | 2017-06-19 | 2017-10-10 | 上海斐讯数据通信技术有限公司 | A kind of wearable device and intelligence sample method |
| CN107991529A (en) * | 2017-12-27 | 2018-05-04 | 广东东方电讯科技有限公司 | Non-linear power measures analysis recorder |
| CN109407027A (en) * | 2018-11-21 | 2019-03-01 | 苏州英特模汽车科技有限公司 | Large range high precision current sensor metering method |
| CN111289919A (en) * | 2020-04-03 | 2020-06-16 | 广州市扬新技术研究有限责任公司 | Multi-range contact net leakage current detection device |
| CN111413539A (en) * | 2020-03-13 | 2020-07-14 | 创驱（上海）新能源科技有限公司 | Circuit and method for realizing wide-range high-precision current detection by double current sensors |
| CN111562435A (en) * | 2020-05-28 | 2020-08-21 | 南京国信能源有限公司 | Novel fill electric pile with direct current electric energy meter |
| CN112763779A (en) * | 2021-01-28 | 2021-05-07 | 湖北三江航天红峰控制有限公司 | Device for enlarging detection range of current sensor |
| CN113804940A (en) * | 2021-09-23 | 2021-12-17 | 华东光电集成器件研究所 | High-precision closed-loop Hall current sensor circuit |
| CN114659545A (en) * | 2022-04-29 | 2022-06-24 | 东风电驱动系统有限公司 | Double-range self-adaptive measurement method and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033667A (en) * | 2012-12-11 | 2013-04-10 | 工业和信息化部电子第五研究所 | Current measurement device and method |
| CN203587634U (en) * | 2013-11-04 | 2014-05-07 | 江苏林洋电子股份有限公司 | Wide-range metering electric energy meter sampling in compound manner |
| CN104535831A (en) * | 2015-01-15 | 2015-04-22 | 威胜集团有限公司 | Wide-range electric energy meter based on hall sensor |
| CN204462249U (en) * | 2015-01-15 | 2015-07-08 | 威胜集团有限公司 | Based on the wide magnitude electrical energy meter of Hall element |
| CN204536397U (en) * | 2015-01-15 | 2015-08-05 | 威胜集团有限公司 | Current sensing means |
| CN204789746U (en) * | 2015-07-15 | 2015-11-18 | 威胜集团有限公司 | Current detection device and electric energy meter of making with device |
-
2015
- 2015-07-15 CN CN201510414443.XA patent/CN104977459A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033667A (en) * | 2012-12-11 | 2013-04-10 | 工业和信息化部电子第五研究所 | Current measurement device and method |
| CN203587634U (en) * | 2013-11-04 | 2014-05-07 | 江苏林洋电子股份有限公司 | Wide-range metering electric energy meter sampling in compound manner |
| CN104535831A (en) * | 2015-01-15 | 2015-04-22 | 威胜集团有限公司 | Wide-range electric energy meter based on hall sensor |
| CN204462249U (en) * | 2015-01-15 | 2015-07-08 | 威胜集团有限公司 | Based on the wide magnitude electrical energy meter of Hall element |
| CN204536397U (en) * | 2015-01-15 | 2015-08-05 | 威胜集团有限公司 | Current sensing means |
| CN204789746U (en) * | 2015-07-15 | 2015-11-18 | 威胜集团有限公司 | Current detection device and electric energy meter of making with device |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891591A (en) * | 2016-04-08 | 2016-08-24 | 北京精密机电控制设备研究所 | Large-power energy-storage inverter current detection and control system |
| CN105891591B (en) * | 2016-04-08 | 2018-08-31 | 北京精密机电控制设备研究所 | A kind of large power energy storage inverter current detecting and controlling system |
| CN107238410A (en) * | 2017-06-19 | 2017-10-10 | 上海斐讯数据通信技术有限公司 | A kind of wearable device and intelligence sample method |
| CN107991529A (en) * | 2017-12-27 | 2018-05-04 | 广东东方电讯科技有限公司 | Non-linear power measures analysis recorder |
| CN109407027A (en) * | 2018-11-21 | 2019-03-01 | 苏州英特模汽车科技有限公司 | Large range high precision current sensor metering method |
| CN111413539A (en) * | 2020-03-13 | 2020-07-14 | 创驱（上海）新能源科技有限公司 | Circuit and method for realizing wide-range high-precision current detection by double current sensors |
| CN111413539B (en) * | 2020-03-13 | 2022-03-01 | 创驱（上海）新能源科技有限公司 | Circuit and method for realizing wide-range high-precision current detection by double current sensors |
| CN111289919A (en) * | 2020-04-03 | 2020-06-16 | 广州市扬新技术研究有限责任公司 | Multi-range contact net leakage current detection device |
| CN111562435A (en) * | 2020-05-28 | 2020-08-21 | 南京国信能源有限公司 | Novel fill electric pile with direct current electric energy meter |
| CN112763779A (en) * | 2021-01-28 | 2021-05-07 | 湖北三江航天红峰控制有限公司 | Device for enlarging detection range of current sensor |
| CN113804940A (en) * | 2021-09-23 | 2021-12-17 | 华东光电集成器件研究所 | High-precision closed-loop Hall current sensor circuit |
| CN113804940B (en) * | 2021-09-23 | 2024-03-01 | 华东光电集成器件研究所 | High-precision closed-loop Hall current sensor circuit |
| CN114659545A (en) * | 2022-04-29 | 2022-06-24 | 东风电驱动系统有限公司 | Double-range self-adaptive measurement method and device |
| CN114659545B (en) * | 2022-04-29 | 2024-01-09 | 东风电驱动系统有限公司 | Double-range self-adaptive measurement method and device |
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