CN202256454U - Current sensor - Google Patents
Current sensor Download PDFInfo
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- CN202256454U CN202256454U CN2011203853385U CN201120385338U CN202256454U CN 202256454 U CN202256454 U CN 202256454U CN 2011203853385 U CN2011203853385 U CN 2011203853385U CN 201120385338 U CN201120385338 U CN 201120385338U CN 202256454 U CN202256454 U CN 202256454U
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Abstract
The utility model discloses a current sensor, which comprises a C-shaped magnetic core, a Hall element, an operational amplifier, a measuring resistor and a power input module; a conductor carrying the current to be measured passes through the cavity of the C-shaped magnetic core; the power supply input module comprises a positive direct-current power supply + Vc, a negative direct-current power supply-VC, a first triode T1 and a second triode T2; the Hall element is arranged at the notch of the C-shaped magnetic core, and one output end of the Hall element is connected with the positive input end of the operational amplifier through a first resistor R1; the other output end of the Hall element is connected with the negative input end of the operational amplifier through a second resistor R2; the output end of the operational amplifier is connected with the B pole of the first diode; the C-shaped magnetic core is wound with a compensation coil as a secondary side. The Hall element in the current sensor works in a zero magnetic flux state, and the detection precision is high.
Description
Technical field
The utility model relates to a kind of current sensor, can be applied to fields such as railway locomotive and automobile, metallurgy, chemical industry.
Background technology
Hall current sensor has superior electrical property, is electrical detecting element a kind of advanced person, that can isolate main circuit loop and electronic control circuit.It combines all advantages of mutual inductor and shunt, has overcome mutual inductor simultaneously again and only has been applicable to that measurement of 50Hz power frequency and shunt can't carry out the deficiency of isolation measurement.Utilize same Hall current voltage sensor senses element both can detect interchange and also can detect direct current, even can the detected transient peak value, thereby be the new generation product that substitutes mutual inductor and shunt.
Can be divided into direct measuring type (open loop) and magnetic balance type (closed loop) on the Hall current sensor principle.The direct measuring type current sensor is relatively poor because of precision, the linearity; Response time is slower; Shortcomings such as temperature drift is bigger and be used for the not high occasion of accuracy requirement more.Magnetic balance type (closed loop) current sensor has overcome numerous shortcomings of direct measuring type current sensor, and have and can measure the random waveform electric current simultaneously, as: direct current, interchange, pulse current; Advantages such as the response time is fast.
Hall element has an outstanding shortcoming and is; Long-term work can cause the Hall element magnetization in state of saturation; So that influence its output linearity, thereby cause measuring accuracy low, this also is the problem that prior art does not have to solve or solve difficulty big (or cost is high).
The utility model content
The utility model technical matters to be solved provides a kind of current sensor, and the Hall element in this current sensor is operated under the zero magnetic flux state, and accuracy of detection is high.
The technical solution of the utility model is following:
A kind of current sensor comprises C shape magnetic core, Hall element, operational amplifier, measuring resistance and Power Entry Module;
The conductor that carries tested electric current passes from the cavity of this C shape magnetic core;
Power Entry Module comprises that positive direct-current power supply, the C utmost point of negative direct supply, first triode and second triode, first triode and the C utmost point of second triode connect positive direct-current power supply and negative direct supply respectively; The E utmost point of first triode and the butt joint of the E utmost point of second triode; The B utmost point of first triode and the butt joint of the B utmost point of second triode;
Hall element is arranged on the indentation, there of C shape magnetic core, and an output terminal of Hall element connects the positive input terminal of operational amplifier through first resistance; Another output terminal of Hall element connects the negative input end of operational amplifier through second resistance; The B utmost point of output termination first diode of operational amplifier;
Be wound with compensating coil on the C shape magnetic core as secondary; An E utmost point of drawing termination first diode of compensating coil, another exit of compensating coil is as the output terminal of current sensor, and this output terminal is through measuring resistance ground connection.
First triode and second triode are positive-negative-positive; The resistance of first resistance and second resistance equates.
The principle of work of the utility model is following:
The current sensor of the utility model is a kind of magnetic balance type Hall current sensor; Utilize Ampere circuit law to measure the locomotive traction motor exciting current; Be the magnetic field that primary current (Ip) is produced; The magnetic field that electric current (Is) through a secondary coil is produced compensates, and makes hall device be in the duty that detects zero magnetic flux all the time.When the magnetic field that former secondary offset current produces reaches balance in magnetic core, following equality is arranged promptly:
N×Ip＝n×Is
In the formula: Ip is a primary current; N is the number of turn of primary coil; Is is the secondary offset current; N is the number of turn of secondary coil.
Find out by following formula, when the former limit of known sensor and the secondary coil number of turn,, can extrapolate the value of primary current Ip, thereby realize the isolation measurement of primary current through measuring the size of secondary offset current Is.
Like Fig. 1; The magnetic balance type current sensor is also claimed compensation sensor; Be that the magnetic field that primary current Ip produces in the magnetism gathering rings place compensates through the magnetic field that secondary current produced; Its offset current Is reflects primary current Ip accurately, thereby makes hall device be in the duty that detects zero magnetic flux.
The detailed operation process is: when major loop have an electric current through the time, assembled by magnet ring in the magnetic field that produces on the lead and sense on the hall device, the signal output that is produced is used for the driving power pipe and makes its conducting, thereby obtains an offset current Is.This electric current produces magnetic field through multicircuit winding again, and the magnetic field that this magnetic field and tested electric current produce is just in time opposite, thereby has compensated original magnetic field, and the output of hall device is reduced gradually.When multiplying each other the magnetic field that produced when equating with Ip and the number of turn, Is no longer increases, and hall device at this moment plays the effect of indication zero magnetic flux, and can come test I p this moment through Is.When Ip changed, balance was damaged, and hall device has signal output, promptly repeats said process and reaches balance again.Any variation of tested electric current all can destroy this balance.In case magnetic field out of trim, hall device just have signal output.After power amplification, just there is corresponding electric current to flow through secondary winding at once so that unbalance magnetic field is compensated.Unbalance to balance once more from magnetic field, less than 1 μ s, this is the process of a mobile equilibrium on the required time theory.Therefore, see that secondary offset current ampere turns all equates with the ampere turns of elementary tested electric current at any time from macroscopic view.
The utility model magnetic balance type Hall current sensor adopts closed loop control, has improved sensor's response speed, has guaranteed the accurate measurement to current of electric.Reduce magnetic field air gap, winding mode through technology, and carry out power tube, Hall element pairing, improved the sensor zero point parameter greatly.The sensor supply voltage is provided with short-circuit protection, has improved the security of sensor.Magnetic balance type Hall voltage sensor can be in-25 ℃～70 ℃ ambient temperature ranges operate as normal, the fundamental measurement error be measured value ± 1%, measurement range 0～± 1800A.
Beneficial effect:
The current sensor of the utility model is a kind of Hall magnetic balance type current sensor, and antijamming capability is strong, can under bad working environment, measure the locomotive traction motor exciting current accurately, reliably.Be operated in because of the utility model Hall element under the state of zero magnetic flux, so can consequently not influence its output linearity because of long-term work causes the Hall chip magnetization in state of saturation.
Description of drawings
Fig. 1 is the circuit theory synoptic diagram of the utility model.
Label declaration: the 1-magnetic core, the 2-Hall element, the 3-operational amplifier, 4-secondary compensating coil, Ip are primary current, and Is is the secondary offset current, and Rm is a measuring resistance.
Embodiment
Below will combine accompanying drawing and specific embodiment that the utility model is explained further details.
Embodiment 1:
As shown in Figure 1, a kind of current sensor comprises C shape magnetic core, Hall element, operational amplifier, measuring resistance and Power Entry Module;
The conductor that carries tested electric current passes from the cavity of this C shape magnetic core;
Power Entry Module comprises positive direct-current power supply+Vc, negative direct supply-VC, the first triode T1 and the second triode T2; The C utmost point of first triode and the C utmost point of second triode meet positive direct-current power supply+Vc and negative direct supply-Vc respectively; The E utmost point of first triode and the butt joint of the E utmost point of second triode; The B utmost point of first triode and the butt joint of the B utmost point of second triode;
Hall element is arranged on the indentation, there of C shape magnetic core, and an output terminal of Hall element connects the positive input terminal of operational amplifier through first resistance R 1; Another output terminal of Hall element connects the negative input end of operational amplifier through second resistance R 2; The B utmost point of output termination first diode of operational amplifier;
Be wound with compensating coil on the C shape magnetic core as secondary; An E utmost point of drawing termination first diode of compensating coil, another exit of compensating coil is as the output terminal of current sensor, and this output terminal is through measuring resistance ground connection.
The first triode NPN type, second triode is positive-negative-positive; The resistance of first resistance and second resistance equates to be 820 ohm, positive and negative direct supply+Vc ,-the Vc value is ± 15V～± 24V symmetry power supply.
The current sensor of the utility model can be applied in the abominable occasion of various environment; Such as; As the system power detection part, main effect is the output current of isolation detection electricity generation system to the current sensor of the utility model, through signal of sensor is handled in the locomotive electricity generation system; Set the current limliting working point, guarantee that the output power of electricity generation system is not higher than the rated power of motor.The output signal of the current sensor through the utility model is set limits output (flowing through) electric current of motor, and the output power of avoiding occurring generator (traction electric machine) is too high and break down or damage, and guarantees the operate as normal of power system.
The current sensor of the utility model has following performance parameter:
1) can measure the random waveform electric current simultaneously, as: direct current, interchange, pulse current;
2) secondary is measured complete electrical isolation between electric current and the tested electric current in former limit, and insulation voltage is generally 2KV～8KV;
3) current measuring range is wide, can measure specified 1mA～50KA electric current;
4) tracking velocity di/dt: be higher than 50A/us;
5) linearity: be superior to 0.1%IN;
6) response time: less than 1us;
7) frequency response: 0～100KHz.
8) size is little, and is in light weight, is easy to install and can not bring any loss to system.
Claims (2)
1. a current sensor is characterized in that, comprises C shape magnetic core, Hall element, operational amplifier, measuring resistance and power supply
Load module;
The conductor that carries tested electric current passes from the cavity of this C shape magnetic core;
Power Entry Module comprise the positive direct-current power supply (+Vc), negative direct supply (VC), first triode (T1) and second triode (T2); The C utmost point of first triode and the C utmost point of second triode connect respectively the positive direct-current power supply (+Vc) with negative direct supply (Vc); The E utmost point of first triode and the butt joint of the E utmost point of second triode; The B utmost point of first triode and the butt joint of the B utmost point of second triode;
Hall element is arranged on the indentation, there of C shape magnetic core, and an output terminal of Hall element connects the positive input terminal of operational amplifier through first resistance (R1); Another output terminal of Hall element connects the negative input end of operational amplifier through second resistance (R2); The B utmost point of output termination first diode of operational amplifier;
Be wound with compensating coil on the C shape magnetic core as secondary; An E utmost point of drawing termination first diode of compensating coil, another exit of compensating coil is as the output terminal of current sensor, and this output terminal is through measuring resistance ground connection.
2. current sensor according to claim 1 is characterized in that, first triode and second triode are positive-negative-positive;
The resistance of first resistance and second resistance equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203853385U CN202256454U (en) | 2011-10-12 | 2011-10-12 | Current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203853385U CN202256454U (en) | 2011-10-12 | 2011-10-12 | Current sensor |
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| CN202256454U true CN202256454U (en) | 2012-05-30 |
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| CN2011203853385U Expired - Lifetime CN202256454U (en) | 2011-10-12 | 2011-10-12 | Current sensor |
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Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928649A (en) * | 2012-11-09 | 2013-02-13 | 无锡市锡容电力电器有限公司 | Current sensor for static synchronous compensator |
| CN102969136A (en) * | 2012-11-17 | 2013-03-13 | 郑州三晖电气股份有限公司 | High-current high-accuracy direct-current current transformer |
| CN103616550A (en) * | 2013-11-29 | 2014-03-05 | 河北工业大学 | Giant magnetoresistance current sensor |
| CN103645418A (en) * | 2013-12-04 | 2014-03-19 | 国家电网公司 | Earth fault line selector for transformer station direct current system |
| CN104113046A (en) * | 2014-06-30 | 2014-10-22 | 国家电网公司 | Intermittent starting device of circuit breaker coil |
| CN105074479A (en) * | 2013-03-11 | 2015-11-18 | 株式会社电装 | Electric current sensor |
| CN105158633A (en) * | 2015-09-23 | 2015-12-16 | 厦门红相电力设备股份有限公司 | Method for sharing online state detection data of ultrahigh voltage direct-current lightning arrester by cloud platform |
| CN105158543A (en) * | 2015-09-23 | 2015-12-16 | 厦门红相电力设备股份有限公司 | Acquisition unit for leak current of ultra high voltage direct-current arrester based on two Hall elements |
| CN105182162A (en) * | 2015-09-23 | 2015-12-23 | 厦门红相电力设备股份有限公司 | Noncontact weak leakage current signal acquisition unit with soft magnetic sheet acting as core |
| CN105223533A (en) * | 2015-10-30 | 2016-01-06 | 宁波锦澄电子科技有限公司 | A kind of superhigh precision responds DC current prover circuit fast |
| CN105301325A (en) * | 2015-09-23 | 2016-02-03 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC lightning arrester leakage current acquisition method according to Hall induction theory |
| CN105298382A (en) * | 2014-06-28 | 2016-02-03 | 湖南泰达天易重工有限公司 | Drill burying preventing method of long twist drill |
| CN105301324A (en) * | 2015-09-23 | 2016-02-03 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC lightning arrester leakage current acquisition method according to magnetic balance theory |
| CN105301323A (en) * | 2015-09-23 | 2016-02-03 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC lightning arrester leakage current online detection method by using cloud technology |
| CN105431742A (en) * | 2013-07-24 | 2016-03-23 | 雅马哈株式会社 | Current detection circuit and magnetic detection device provided with same |
| CN105774573A (en) * | 2015-01-13 | 2016-07-20 | 福特全球技术公司 | Bi-directional current sensing using unipolar sensors with closed loop feedback |
| CN105842511A (en) * | 2016-03-30 | 2016-08-10 | 青岛乾程科技股份有限公司 | Dual-coil anti-magnetic-type current transformer |
| CN105988034A (en) * | 2015-02-06 | 2016-10-05 | 广东易事特电源股份有限公司 | Current detection device |
| CN107102187A (en) * | 2017-05-09 | 2017-08-29 | 中国电力科学研究院 | A kind of Zero flux fluxgate current sensor for alternating current-direct current Super-Current Measurement |
| CN108279328A (en) * | 2017-01-05 | 2018-07-13 | 南通杰夫电气有限公司 | Driver for electric vehicle and open loop Hall current sensor |
| CN109683009A (en) * | 2019-01-17 | 2019-04-26 | 上海崇林汽车电子有限公司 | A kind of magnetic circuit device of large range high precision Hall current sensor |
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | A Composite Current-Frequency Sensor |
| CN110828149A (en) * | 2019-10-25 | 2020-02-21 | 珠海多创科技有限公司 | Split-type current transformer and its error compensation method |
| CN112730963A (en) * | 2020-12-22 | 2021-04-30 | 唐新颖 | Automobile-level Hall current sensor with temperature compensation and compensation method thereof |
| CN114242525A (en) * | 2021-12-07 | 2022-03-25 | 华栋 | Intelligent miniature circuit breaker and use method thereof |
| CN115290952A (en) * | 2022-05-13 | 2022-11-04 | 广州金升阳科技有限公司 | a current sensor |
| CN116539942A (en) * | 2023-07-06 | 2023-08-04 | 深圳市知用电子有限公司 | Magnetic flux detection system and current sensor |
-
2011
- 2011-10-12 CN CN2011203853385U patent/CN202256454U/en not_active Expired - Lifetime
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| CN102928649A (en) * | 2012-11-09 | 2013-02-13 | 无锡市锡容电力电器有限公司 | Current sensor for static synchronous compensator |
| CN102969136B (en) * | 2012-11-17 | 2015-09-16 | 郑州三晖电气股份有限公司 | A kind of big current, High-accuracy direct current current transformer |
| CN102969136A (en) * | 2012-11-17 | 2013-03-13 | 郑州三晖电气股份有限公司 | High-current high-accuracy direct-current current transformer |
| CN105074479B (en) * | 2013-03-11 | 2018-01-02 | 株式会社电装 | Current sensor |
| CN105074479A (en) * | 2013-03-11 | 2015-11-18 | 株式会社电装 | Electric current sensor |
| US9841440B2 (en) | 2013-07-24 | 2017-12-12 | Yamaha Corporation | Current detection circuit and magnetic detection device provided with same |
| CN105431742A (en) * | 2013-07-24 | 2016-03-23 | 雅马哈株式会社 | Current detection circuit and magnetic detection device provided with same |
| CN105431742B (en) * | 2013-07-24 | 2017-11-28 | 雅马哈株式会社 | Current detection circuit and the magnetic detection device equipped with the current detection circuit |
| CN103616550A (en) * | 2013-11-29 | 2014-03-05 | 河北工业大学 | Giant magnetoresistance current sensor |
| CN103645418A (en) * | 2013-12-04 | 2014-03-19 | 国家电网公司 | Earth fault line selector for transformer station direct current system |
| CN105298382A (en) * | 2014-06-28 | 2016-02-03 | 湖南泰达天易重工有限公司 | Drill burying preventing method of long twist drill |
| CN104113046A (en) * | 2014-06-30 | 2014-10-22 | 国家电网公司 | Intermittent starting device of circuit breaker coil |
| CN105774573A (en) * | 2015-01-13 | 2016-07-20 | 福特全球技术公司 | Bi-directional current sensing using unipolar sensors with closed loop feedback |
| CN105988034A (en) * | 2015-02-06 | 2016-10-05 | 广东易事特电源股份有限公司 | Current detection device |
| CN105158543A (en) * | 2015-09-23 | 2015-12-16 | 厦门红相电力设备股份有限公司 | Acquisition unit for leak current of ultra high voltage direct-current arrester based on two Hall elements |
| CN105158633B (en) * | 2015-09-23 | 2018-05-22 | 红相股份有限公司 | The method of UHVDC Arrester state on-line checking data is shared with cloud platform |
| CN105301324A (en) * | 2015-09-23 | 2016-02-03 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC lightning arrester leakage current acquisition method according to magnetic balance theory |
| CN105182162B (en) * | 2015-09-23 | 2018-12-07 | 红相股份有限公司 | It is core to the acquisition unit of contactless faint leakage current signal using diskette |
| CN105301325A (en) * | 2015-09-23 | 2016-02-03 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC lightning arrester leakage current acquisition method according to Hall induction theory |
| CN105158543B (en) * | 2015-09-23 | 2018-10-30 | 红相股份有限公司 | Based on double Hall elements to the collecting unit of UHVDC Arrester leakage current |
| CN105301323A (en) * | 2015-09-23 | 2016-02-03 | 厦门红相电力设备股份有限公司 | Ultrahigh voltage DC lightning arrester leakage current online detection method by using cloud technology |
| CN105182162A (en) * | 2015-09-23 | 2015-12-23 | 厦门红相电力设备股份有限公司 | Noncontact weak leakage current signal acquisition unit with soft magnetic sheet acting as core |
| CN105158633A (en) * | 2015-09-23 | 2015-12-16 | 厦门红相电力设备股份有限公司 | Method for sharing online state detection data of ultrahigh voltage direct-current lightning arrester by cloud platform |
| CN105223533A (en) * | 2015-10-30 | 2016-01-06 | 宁波锦澄电子科技有限公司 | A kind of superhigh precision responds DC current prover circuit fast |
| CN105842511A (en) * | 2016-03-30 | 2016-08-10 | 青岛乾程科技股份有限公司 | Dual-coil anti-magnetic-type current transformer |
| CN108279328A (en) * | 2017-01-05 | 2018-07-13 | 南通杰夫电气有限公司 | Driver for electric vehicle and open loop Hall current sensor |
| CN107102187A (en) * | 2017-05-09 | 2017-08-29 | 中国电力科学研究院 | A kind of Zero flux fluxgate current sensor for alternating current-direct current Super-Current Measurement |
| CN107102187B (en) * | 2017-05-09 | 2020-09-25 | 中国电力科学研究院 | Zero-flux fluxgate current sensor for measuring alternating current and direct current heavy current |
| CN109683009A (en) * | 2019-01-17 | 2019-04-26 | 上海崇林汽车电子有限公司 | A kind of magnetic circuit device of large range high precision Hall current sensor |
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | A Composite Current-Frequency Sensor |
| CN110828149A (en) * | 2019-10-25 | 2020-02-21 | 珠海多创科技有限公司 | Split-type current transformer and its error compensation method |
| CN112730963A (en) * | 2020-12-22 | 2021-04-30 | 唐新颖 | Automobile-level Hall current sensor with temperature compensation and compensation method thereof |
| CN114242525A (en) * | 2021-12-07 | 2022-03-25 | 华栋 | Intelligent miniature circuit breaker and use method thereof |
| CN115290952A (en) * | 2022-05-13 | 2022-11-04 | 广州金升阳科技有限公司 | a current sensor |
| CN116539942A (en) * | 2023-07-06 | 2023-08-04 | 深圳市知用电子有限公司 | Magnetic flux detection system and current sensor |
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Granted publication date: 20120530 |