CN202256455U - Magnetic balanced type Hall current sensor - Google Patents
Magnetic balanced type Hall current sensor Download PDFInfo
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- CN202256455U CN202256455U CN2011203865927U CN201120386592U CN202256455U CN 202256455 U CN202256455 U CN 202256455U CN 2011203865927 U CN2011203865927 U CN 2011203865927U CN 201120386592 U CN201120386592 U CN 201120386592U CN 202256455 U CN202256455 U CN 202256455U
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Abstract
The utility model discloses a magnetic balanced type Hall current sensor which comprises a housing, an iron core, a Hall element, a main circuit board and a copper bar, wherein, the iron core and the main circuit board are arranged in the housing; the iron core is a C-shaped iron core; the copper bar penetrates the housing and forms a cavity in the housing together with the iron core; a secondary side coil is wound on the iron core; the Hall element is arranged at the notch of the iron core; and the lead-out end of the coil and the output end of the Hall element are both connected to the main circuit board. In the magnet balanced type Hall current sensor, the Hall element has a high detection precision under a zero-magnetic flux state.
Description
Technical field
The utility model relates to a kind of magnetic balance type Hall 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 (the closed loop current sensor has overcome numerous shortcomings of direct measuring type current sensor, has to 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 magnetic balance type Hall current sensor, and the Hall element in this magnetic balance type Hall 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 magnetic balance type Hall current sensor comprises housing, iron core, Hall element, main circuit board and copper bar; Iron core and main circuit board all are arranged in the housing; Iron core is a C shape iron core, and copper bar passes the cavity that housing and iron core form in housing; Be wound with secondary coil on the iron core; Hall element is arranged on the indentation, there of iron core; The exit of secondary coil and Hall component output are all received described main circuit board.
In housing, be provided with and be used for the colloidal silica that iron core is fixing.
The copper bar two ends of stretching out housing are equipped with at least one connecting hole.
Copper bar is fixed on the housing through screw.
Also be provided with coil rack between iron core and the secondary coil.
The principle of work of the utility model is following:
The magnetic balance type Hall current sensor of the utility model utilizes 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 Hall 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 magnetic balance type Hall current sensor of the utility model 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.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 magnetic balance type Hall current sensor of the utility model, 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.In addition, the magnetic balance type Hall current sensor of the utility model, compact conformation is easy to good reliability is installed.
Description of drawings
Fig. 1 is the circuit theory synoptic diagram of the utility model.
Fig. 2 is a magnetic balance type Hall current sensor outside drawing;
Fig. 3 is an A-A cut-open view among Fig. 2;
Fig. 4 is the side view of Fig. 2.
Label declaration: 1-main circuit board, 2-lid, 4-housing, 5-coil rack, 6-iron core; The 7-copper bar, 8-colloidal silica, 9-Hall element, 10-socket, 13-operational amplifier; 14-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, the circuit structure of magnetic balance type Hall current sensor is: comprise 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 magnetic balance type Hall 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.
Shown in Fig. 2-4, a kind of magnetic balance type Hall current sensor is characterized in that, comprises housing, iron core, Hall element, main circuit board and copper bar; Iron core and main circuit board all are arranged in the housing; Iron core is a C shape iron core, and copper bar passes the cavity that housing and iron core form in housing; Be wound with secondary coil on the iron core; Hall element is arranged on the indentation, there of iron core; The exit of secondary coil and Hall component output are all received described main circuit board.
Also be provided with coil rack between iron core and the secondary coil.
In housing, be provided with and be used for the colloidal silica that iron core is fixing.The copper bar two ends of stretching out housing are equipped with at least one connecting hole.Copper bar is used to import electric current to be measured.
The assembly method of this magnetic balance type Hall current sensor is following:
The Hall components and parts are fixed in (this slot also is in the indentation, there of iron core) in the coil rack slot, and iron core is assemblied in forms the common magnetic circuit system in the coil rack.Magnetic system part through winding wire and Hall element lead and main circuit board be connected, the employing protecting colloid with the magnetic system partial fixing in enclosure interior.It is fastening with screw that copper bar passes magnetic circuit system through housing, main circuit board is welded on the contact pin that is fixed on the socket on the lid through lead, lid is screwed on housing assembles.
The magnetic balance type Hall 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 magnetic balance type Hall 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 magnetic balance type Hall current sensor through the utility model is set; Output (flowing through) electric current to motor limits; 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 magnetic balance type Hall 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.
In addition, need to prove that Hall element can be 1, and is as shown in Figure 1; Also can be 2, as shown in Figure 3, when adopting 2 Hall elements; These 2 Hall element parallel connections, common output current, at this moment; Magnetic core (being iron core) is cut into 2 semi-circular magnetic cores, promptly forms 2 breach, each breach is placed a Hall element.
Claims (5)
1. a magnetic balance type Hall current sensor is characterized in that, comprises housing, iron core, Hall element, main circuit board and copper bar; Iron core and main circuit board all are arranged in the housing; Iron core is a C shape iron core, and copper bar passes the cavity that housing and iron core form in housing; Be wound with secondary coil on the iron core; Hall element is arranged on the indentation, there of iron core; The exit of secondary coil and Hall component output are all received described main circuit board.
2. magnetic balance type Hall current sensor according to claim 1 is characterized in that, also is provided with coil rack between iron core and the secondary coil.
3. magnetic balance type Hall current sensor according to claim 1 is characterized in that, in housing, is provided with to be used for the colloidal silica that iron core is fixing.
4. magnetic balance type Hall current sensor according to claim 1 is characterized in that copper bar is fixed on the housing through screw.
5. according to each described magnetic balance type Hall current sensor of claim 1-3, it is characterized in that the copper bar two ends of stretching out housing are equipped with at least one connecting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203865927U CN202256455U (en) | 2011-10-12 | 2011-10-12 | Magnetic balanced type Hall current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203865927U CN202256455U (en) | 2011-10-12 | 2011-10-12 | Magnetic balanced type Hall current sensor |
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| Publication Number | Publication Date |
|---|---|
| CN202256455U true CN202256455U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203865927U Expired - Lifetime CN202256455U (en) | 2011-10-12 | 2011-10-12 | Magnetic balanced type Hall current sensor |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
| CN104113046A (en) * | 2014-06-30 | 2014-10-22 | 国家电网公司 | Intermittent starting device of circuit breaker coil |
| CN104297564A (en) * | 2014-10-24 | 2015-01-21 | 上海交通大学 | Electric quantity digital converter based on FPGA and magnetic balance type mutual inductor |
| CN104655924A (en) * | 2015-02-03 | 2015-05-27 | 国家电网公司 | Electricity digital converter based on single-chip microcomputer and magnetic balance type mutual inductor |
| CN104678214A (en) * | 2015-02-03 | 2015-06-03 | 国家电网公司 | Electric quantity digitizer based on DSP (Digital Signal Processor) and magnetic balance type Hall sensor |
| CN104678165A (en) * | 2015-02-03 | 2015-06-03 | 国家电网公司 | Electric quantity digitizer based on ARM (Advanced RISC Machine) and magnetic balance type Hall sensor |
| CN104678213A (en) * | 2015-02-03 | 2015-06-03 | 国家电网公司 | Electric quantity digitizer based on DSP (Digital Signal Processor) and magnetic balance type mutual inductor |
| CN105092935A (en) * | 2015-08-07 | 2015-11-25 | 宁波华宇电子有限公司 | Closed-loop Hall current sensor |
| CN105182037A (en) * | 2015-08-07 | 2015-12-23 | 宁波华宇电子有限公司 | Open-loop hall current sensor |
| CN105182038A (en) * | 2015-08-07 | 2015-12-23 | 宁波华宇电子有限公司 | Hall current sensor |
| 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 |
| CN108535527A (en) * | 2018-06-05 | 2018-09-14 | 南京普肯传感科技有限公司 | A kind of full PCB installing types closed-loop type Hall current sensor mounting structure |
| 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 |
| CN110763902A (en) * | 2019-11-04 | 2020-02-07 | 武汉大学 | High-precision arbitrary waveform electromagnetic current transformer and measuring method |
-
2011
- 2011-10-12 CN CN2011203865927U patent/CN202256455U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278737A (en) * | 2013-04-25 | 2013-09-04 | 河北兆联电气设备科技有限公司 | Direct-current self-injection type small-current grounding and route selecting system and method |
| 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 |
| CN104297564A (en) * | 2014-10-24 | 2015-01-21 | 上海交通大学 | Electric quantity digital converter based on FPGA and magnetic balance type mutual inductor |
| CN104678213A (en) * | 2015-02-03 | 2015-06-03 | 国家电网公司 | Electric quantity digitizer based on DSP (Digital Signal Processor) and magnetic balance type mutual inductor |
| CN104678165A (en) * | 2015-02-03 | 2015-06-03 | 国家电网公司 | Electric quantity digitizer based on ARM (Advanced RISC Machine) and magnetic balance type Hall sensor |
| CN104678214A (en) * | 2015-02-03 | 2015-06-03 | 国家电网公司 | Electric quantity digitizer based on DSP (Digital Signal Processor) and magnetic balance type Hall sensor |
| CN104655924A (en) * | 2015-02-03 | 2015-05-27 | 国家电网公司 | Electricity digital converter based on single-chip microcomputer and magnetic balance type mutual inductor |
| CN105092935A (en) * | 2015-08-07 | 2015-11-25 | 宁波华宇电子有限公司 | Closed-loop Hall current sensor |
| CN105182037A (en) * | 2015-08-07 | 2015-12-23 | 宁波华宇电子有限公司 | Open-loop hall current sensor |
| CN105182038A (en) * | 2015-08-07 | 2015-12-23 | 宁波华宇电子有限公司 | Hall current sensor |
| CN108535527A (en) * | 2018-06-05 | 2018-09-14 | 南京普肯传感科技有限公司 | A kind of full PCB installing types closed-loop type Hall current sensor mounting structure |
| CN108535527B (en) * | 2018-06-05 | 2023-12-05 | 南京普肯传感科技有限公司 | Full PCB installation type closed loop Hall current sensor installation structure |
| 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 |
| CN110763902A (en) * | 2019-11-04 | 2020-02-07 | 武汉大学 | High-precision arbitrary waveform electromagnetic current transformer and measuring method |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |
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| CX01 | Expiry of patent term |