CN202057711U - Closed loop magnetic balance type Hall current type sensor - Google Patents
Closed loop magnetic balance type Hall current type sensor Download PDFInfo
- Publication number
- CN202057711U CN202057711U CN2011201076423U CN201120107642U CN202057711U CN 202057711 U CN202057711 U CN 202057711U CN 2011201076423 U CN2011201076423 U CN 2011201076423U CN 201120107642 U CN201120107642 U CN 201120107642U CN 202057711 U CN202057711 U CN 202057711U
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- CN
- China
- Prior art keywords
- operational amplifier
- hall element
- closed loop
- compensating coil
- magnetic balance
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- Expired - Fee Related
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The utility model discloses a closed loop magnetic balance type Hall current type sensor which is small in zero drift, and is rapid in response speed. The closed loop magnetic balance type Hall current type sensor is provided with a magnetic ring, and the center of the magnetic ring is provided with a one-off current input lead. The magnet ring is provided with a Hall element and a compensating coil. The Hall element is connected with one end of the compensating coil via an amplifying circuit, and the other end of the compensating coil is connected with a load resistor Rm. The amplifying circuit is provided with an operational amplifier IC1 and a power amplifier which is composed of a triode Q1 and a triode Q2. The Hall element is connected with a negative input terminal of the operational amplifier IC1 via a resistor R1, and is connected with a positive input terminal of the operational amplifier IC1 via a resistor R2. The output of the power amplifier is fed back to the negative input terminal of the operational amplifier IC1 via a zeroing circuit FH1.
Description
Technical field
The utility model relates to a kind of closed loop magnetic balance type Hall current formula sensor, the closed loop magnetic balance type Hall current formula sensor that especially a kind of zero point drift is little, response speed is fast.
Background technology
At present, known Hall current sensor has two kinds of open loop direct measuring type and closed loop magnetic balance types all based on the Hall effect principle.Because open loop direct measuring type Hall current sensor precision is lower, response speed is slower, so adopt closed loop magnetic balance type Hall current sensor in fields such as wind-powered electricity generation, DC motor driver, storage battery power supply and welder powers more.Existing closed loop magnetic balance type current sensor is provided with magnet ring, the center is equipped with the primary current input lead in the magnet ring, magnet ring is provided with Hall element and compensating coil, Hall element joins by an end of amplifying circuit and compensating coil, and the other end of compensating coil and pull-up resistor Rm join and be the current detecting end.When electric current flows through the primary current input lead, around lead, produce magnetic field, the size in magnetic field is directly proportional with the size of current that flows through lead, this magnetic field is assembled by magnet ring, detect with hall device then, because the variation in magnetic field and the output voltage signal of hall device have good linear relationship, therefore can utilize hall device to record output signal, directly reflect current in wire (primary current) size.Closed loop magnetic balance type current sensor has advantages such as precision height, response time weak point, but weather conditions than rugged environment in (as wind power system) zero point drift big, especially the zero point drift that brings of high temperature and low temperature is particularly serious, thereby cause whole stability and consistance bad, had a strong impact on the precision of system's operation, cause system's misoperation, even damage equipment.
Summary of the invention
The utility model is in order to solve the above-mentioned technical matters of existing in prior technology, the closed loop magnetic balance type Hall current formula that a kind of zero point drift is little, response speed is fast sensor to be provided.
Technical solution of the present utility model is: a kind of closed loop magnetic balance type Hall current formula sensor, magnet ring is arranged, the center is equipped with the primary current input lead in the magnet ring, magnet ring is provided with Hall element and compensating coil, Hall element joins by an end of amplifying circuit and compensating coil, the other end of compensating coil and pull-up resistor Rm join, described amplifying circuit is provided with operational amplifier IC1 and reaches by triode Q1, the power amplifier that Q2 constitutes, Hall element joins by the negative input end of resistance R 1 with operational amplifier IC1, Hall element joins by the positive input terminal of resistance R 2 with operational amplifier IC1, and the output of power amplifier feeds back to the negative input end of operational amplifier IC1 by zeroing circuit FH1.
The utility model has increased zeroing circuit, but the adjusting offset current at zero point of fast and stable is little to guarantee zero stability and zero point drift, has improved zero stability, can stable operation under-40 ℃ ~+85 ℃ environment; Precision is good, and the overall accuracy in the time of 25 ℃ is ± 0.4%; The linearity is good＜and 0.1%; High low temperature drift is low; Response time is short,＜1 microsecond; Anti-external interference ability is strong, can measure the current signal (comprising direct current, interchange, pulse signal) of any kind of.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.As shown in Figure 1: the same with prior art, magnet ring 1 is arranged, the center is equipped with primary current input lead 2 in the magnet ring 1, magnet ring 1 is provided with Hall element 3 and compensating coil 4, Hall element 3 joins by an end of amplifying circuit and compensating coil 4, the other end of compensating coil 4 and pull-up resistor Rm join, described amplifying circuit is provided with operational amplifier IC1 and reaches by triode Q1, the power amplifier that Q2 constitutes, Hall element 3 joins by the negative input end of resistance R 1 with operational amplifier IC1, Hall element 3 joins by the positive input terminal of resistance R 2 with operational amplifier IC1, the output of power amplifier feeds back to the negative input end of operational amplifier IC1 by zeroing circuit FH1, zeroing circuit can be selected present sold any a, by testing definite optimal parameter.
Claims (1)
1. closed loop magnetic balance type Hall current formula sensor, magnet ring (1) is arranged, the interior center of magnet ring (1) is equipped with primary current input lead (2), magnet ring (1) is provided with Hall element (3) and compensating coil (4), Hall element (3) joins by an end of amplifying circuit and compensating coil (4), the other end and the pull-up resistor Rm of compensating coil (4) join, it is characterized in that: described amplifying circuit is provided with operational amplifier IC1 and reaches by triode Q1, the power amplifier that Q2 constitutes, Hall element (3) joins by the negative input end of resistance R 1 with operational amplifier IC1, Hall element (3) joins by the positive input terminal of resistance R 2 with operational amplifier IC1, and the output of power amplifier feeds back to the negative input end of operational amplifier IC1 by zeroing circuit FH1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201076423U CN202057711U (en) | 2011-04-13 | 2011-04-13 | Closed loop magnetic balance type Hall current type sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201076423U CN202057711U (en) | 2011-04-13 | 2011-04-13 | Closed loop magnetic balance type Hall current type sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202057711U true CN202057711U (en) | 2011-11-30 |
Family
ID=45017681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201076423U Expired - Fee Related CN202057711U (en) | 2011-04-13 | 2011-04-13 | Closed loop magnetic balance type Hall current type sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202057711U (en) |
Cited By (3)
| 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 |
| CN104345204A (en) * | 2013-08-07 | 2015-02-11 | 德州仪器德国股份有限公司 | Hybrid closed-loop/open-loop magnetic current sensor |
| CN105277774A (en) * | 2015-10-29 | 2016-01-27 | 杭州电子科技大学 | High-precision current monitoring circuit for power battery management |
-
2011
- 2011-04-13 CN CN2011201076423U patent/CN202057711U/en not_active Expired - Fee Related
Cited By (5)
| 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 |
| CN104345204A (en) * | 2013-08-07 | 2015-02-11 | 德州仪器德国股份有限公司 | Hybrid closed-loop/open-loop magnetic current sensor |
| CN104345204B (en) * | 2013-08-07 | 2019-03-19 | 德州仪器德国股份有限公司 | Mixed and closed-loop/open loop magnetic current sensors |
| CN105277774A (en) * | 2015-10-29 | 2016-01-27 | 杭州电子科技大学 | High-precision current monitoring circuit for power battery management |
| CN105277774B (en) * | 2015-10-29 | 2017-12-26 | 杭州电子科技大学 | A kind of high-precision current observation circuit for electrokinetic cell management |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20120413 |