CN205280795U - Single chip current sensor - Google Patents
Single chip current sensor Download PDFInfo
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- CN205280795U CN205280795U CN201521029264.6U CN201521029264U CN205280795U CN 205280795 U CN205280795 U CN 205280795U CN 201521029264 U CN201521029264 U CN 201521029264U CN 205280795 U CN205280795 U CN 205280795U
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Abstract
The utility model discloses a single chip current sensor, its intensity of overflow tank according to being produced by the survey electric current detects by the survey electric current, this single chip current sensor is including integrated conductor, a magnetic sensor, the 2nd magnetic sensor on same chip, the conductor is used for can being flow through this conductor for being provided the passageway of flowing through by the survey electric current, making by the survey electric current, a magnetic sensor and the 2nd magnetic sensor lie in around the conductor to form the differential output, there is the converging portion that the width narrows down on the conductor. Compared with the prior art, the utility model discloses not only can eliminate external magnetic field interference, improve stability and sensitivity, can reduce or eliminate the sensor in addition and await measuring the measuring error that circuit contact resistance difference brought.
Description
[technical field]
The utility model relates to current sense device technical field, particularly relates to a kind of single-chip current sensor.
[background technology]
It is widely used in various electronics for measuring the current sense device of size of current. Traditional a kind of current sense device obtains the size of electric current in circuit by measuring the voltage at resistance two ends in circuit of connecting. But the power consumption loss of this kind of method is big, and resistance can cause measuring error with temperature drift.
Another kind of traditional current sense device needs the wire flowed through by electric current through magnetism-collected structure (the ring-type magnetism-collected structure that normally is made up of soft magnetic materials), then measures magnetic field size by built-in Magnetic Sensor. It is big to there is volume in this kind of method, it may also be useful to the defects such as inconvenience.
Another kind of current sense device makes tested electric current flow through the integrated conductor of sensor internal, and Magnetic Sensor directly measures the magnetic field that in conductor, electric current produces. Specific design describes as application publication number CN103323643A, the Chinese invention patent application of application number 2012100750174, and sensor internal is integrated with the conductor of a U-shaped, places two Magnetic Sensors and carry out difference measurement around conductor. When the contact resistance difference that the defect of this kind of design is between sensor and circuit under test causes the electric current distribution of conductor current input terminus uneven, the magnetic field that electric current produces also can be uneven, thus affects the precision of sensor.
Because, it is necessary to propose a kind of improved plan and overcome the problems referred to above.
[practical novel content]
The purpose of this utility model is to provide a kind of single-chip current sensor, and it can not only eliminate external magnetic field interference, it is to increase stability and sensitivity, and can reduce or eliminate sensor and measuring error that circuit under test contact resistance difference is brought.
In order to solve the problem, the utility model provides a kind of single-chip current sensor, it detects described determined electric current according to the magnetic induction density that determined electric current produces, this single-chip current sensor comprises integrated conductor on the same chip, the first Magnetic Sensor, the 2nd Magnetic Sensor, described conductor is used for flowing through passage for determined electric current provides, and enables determined electric current flow through this conductor; First Magnetic Sensor and the 2nd Magnetic Sensor are positioned at around conductor, to form difference output; Conductor exists the contraction section of narrowed width.
Further, the direction that described conductor comprises on the first leg the 2nd leg parallel with the first leg and the connection section of connection the first leg and the 2nd leg, the first leg and the 2nd leg the determined electric current flow through is contrary; First Magnetic Sensor and the 2nd Magnetic Sensor lay respectively at the first leg and the top of the 2nd leg; Or first Magnetic Sensor and the 2nd Magnetic Sensor lay respectively at the first leg and the lower section of the 2nd leg, there is the contraction section of narrowed width respectively at the first leg and the 2nd leg.
Further, the first Magnetic Sensor is between the contraction section being positioned at the first leg and connection section; 2nd Magnetic Sensor is between the contraction section being positioned at the 2nd leg and connection section.
Further, the contraction section of the first leg is symmetrical about the medullary ray of the first leg; The contraction section of the 2nd leg is symmetrical about the medullary ray of the 2nd leg.
Further, the non-medullary ray about the first leg of the contraction section of the first leg is symmetrical; The non-medullary ray about the 2nd leg of the contraction section of the 2nd leg is symmetrical.
The further figure of contraction section of the first leg and the figure of the contraction section of the 2nd leg are symmetrical about the medullary ray of described conductor.
Further, described conductor is U-shaped conductor, is provided with insulation layer between described conductor and the first Magnetic Sensor, the 2nd Magnetic Sensor.
Further, described Magnetic Sensor is anisotropic magnetoresistive, huge magnetic impedance, tunnel magneto or hall sensing device.
Further, one end that the first leg is not connected with connection section is provided with some solder joints, one end that the 2nd leg is not connected with connection section is provided with some solder joints.
Prior art is compared, and by arranging around the conductor that tested electric current can be made to flow through, two Magnetic Sensors carry out difference measurement to the utility model, thus eliminates external magnetic field interference, it is to increase stability and sensitivity; And by arranging the contraction section of narrowed width on the conductor, make the electric current distribution in conductor even, thus the measuring error that reduction or the contact resistance difference between elimination sensor and circuit under test are brought.
[accompanying drawing explanation]
In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing used required in embodiment being described is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings. Wherein:
Fig. 1 is the structural representation of the single-chip current sensor of the utility model in an embodiment;
Fig. 2 (a) and Fig. 2 (b) is respectively the first Magnetic Sensor and the Distribution of Magnetic Field figure of the 2nd Magnetic Sensor position;
Fig. 3 is the structural representation of the single-chip current sensor of the utility model in another embodiment.
[embodiment]
Detailed description of the present utility model is mainly through the running describing direct or indirect simulation technical solutions of the utility model of program, step, logic block, process or other symbols. For thorough understanding the utility model, ensuing description set forth a lot of specific detail. And when not having these specific detail, the utility model then may still can realize. Technician in art uses the work that these describe and statement effectively introduces them to the others skilled in the art in art herein essential. In other words, it is the purpose of this utility model of avoiding confusion, owing to the method known and program be not it should be readily understood that therefore they are described in detail.
Alleged herein " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the utility model. Different local in this manual " in the embodiment " occurred not all refers to same embodiment, neither be independent or optionally mutually exclusive with other embodiments embodiment. Those of ordinary skill in art it is well known that, represent being connected, connect or connecting etc. in the utility model and be directly or indirectly electrically connected.
Single-chip current sensor in the utility model detects described determined electric current according to the magnetic induction density that determined electric current produces, it comprises integrated conductor on the same chip, the first Magnetic Sensor, the 2nd Magnetic Sensor, described conductor is used for flowing through passage for determined electric current provides, and enables determined electric current flow through this conductor; First Magnetic Sensor and the 2nd Magnetic Sensor are positioned at around conductor, to form difference output (namely the first Magnetic Sensor and the 2nd Magnetic Sensor can obtain the magnetic field size of determined electric current generation by difference measurement); Conductor exists the contraction section of narrowed width.
In an embodiment, described conductor comprises the first leg two leg parallel with the first leg and connects the connection section of the first leg and the 2nd leg, the direction of the determined electric current flow through on the first leg and the 2nd leg is contrary, there is the contraction section of narrowed width respectively at the first leg and the 2nd leg, the first Magnetic Sensor and the 2nd Magnetic Sensor lay respectively at the first leg and the top of the 2nd leg; Or first Magnetic Sensor and the 2nd Magnetic Sensor lay respectively at the first leg and the top of the 2nd leg.
Please refer to shown in Fig. 1, it is the structural representation of the single-chip current sensor of the utility model in an embodiment. Single-chip current sensor in Fig. 1 comprises conductor 10, first Magnetic Sensor 20, the 2nd Magnetic Sensor 30, is provided with insulation layer between conductor 10 and the first Magnetic Sensor 20, the 2nd Magnetic Sensor 30. Wherein, conductor 10 is U-shaped, and the conductor 10 of this U-shaped dress comprises the first leg 11, the 2nd leg 12 and connects the connection section 13 of the first leg 11 and the 2nd leg 12; First Magnetic Sensor 20 is positioned at the lower section of the first leg 11, and the 2nd Magnetic Sensor 30 is positioned at the lower section of the 2nd leg 12. Electric current I to be determined flows into from the first leg 11 of conductor 10, flows out from the 2nd leg 12.
Please refer to shown in Fig. 2 (a) and Fig. 2 (b), it is respectively the first Magnetic Sensor 20 and the Distribution of Magnetic Field figure of the 2nd Magnetic Sensor 30 position. Wherein, BIFor determined electric current flows through the magneticstrength of conductor generation; B0For external magnetic field intensity, if B0Direction is negative direction, and the magneticstrength that the first Magnetic Sensor 20 detects is B1, the magneticstrength that the 2nd Magnetic Sensor 30 detects is B2, then
B1=+(BI�CB0)(1)
B2=-(BI+B0)(2)
Formula (1)-formula (2) can obtain difference magneticstrength BS, BS=B1-B2=2BI��
It can thus be seen that the single-chip current sensor in the utility model carries out difference measurement by arranging two Magnetic Sensors around described conductor 10, thus eliminate external magnetic field interference, it is to increase stability and sensitivity.
Shown in Fig. 1, there is the contraction section 11a of narrowed width in the first leg 11 of conductor 10, there is the contraction section 12a of narrowed width at the 2nd leg 12. The utility model, by arranging the contraction section of narrowed width on the conductor 10, makes the electric current distribution in conductor 10 even, thus reduces or eliminate sensor and measuring error that circuit under test contact resistance difference is brought.
In the embodiment shown in fig. 1, the first Magnetic Sensor 20 is positioned at the lower section of the first leg 11, and between the contraction section 11a and connection section 13 of the first leg; 2nd Magnetic Sensor 30 is positioned at the lower section of the 2nd leg 12, and between the contraction section 12a and connection section 13 of the 2nd leg. The contraction section 11a of the first leg is symmetrical about the medullary ray of the first leg 11; The contraction section 12a of the 2nd leg is symmetrical about the medullary ray of the 2nd leg 12.
Below based on the single-chip current sensor shown in Fig. 1, specifically introduce principle of the present utility model.
The current input terminal of the U-shaped conductor of single-chip current sensor and output terminal are respectively arranged with five solder joints, if the resistance of solder joint is different, the distribution of current of input terminus or output terminal can be caused uneven, determined electric current flows into U-shaped conductor primarily of the solder joint of Far Left, flows out by the solder joint on the right. Like this, the sense of current in existing U-shaped conductor diagonally, because Magnetic Sensor mainly measures magnetic field in the horizontal direction, if the sense of current is diagonally, can cause measuring error.
Owing to the single-chip current sensor shown in Fig. 1 is respectively arranged with the contraction section of narrowed width at the first leg 11 of U-shaped conductor and the 2nd leg 12, therefore, it is possible to correct the above-mentioned current unevenness that may occur to a certain extent even. In FIG, one end (it can be called input terminus) that determined electric current is not connected with connection section 13 from the first leg 11, the solder joint of Far Left flows into, from one end (it can be called output terminal) that the 2nd leg 12 is not connected with connection section 13, the solder joint on the right flows out, determined electric current is first after contraction section, major part electric current can design the direction flowing expected in edge, such that it is able to ensure measuring accuracy.
Please refer to shown in Fig. 3, it is the structural representation of the single-chip current sensor of the utility model in another embodiment. The difference of Fig. 3 and Fig. 1 is, the contraction section 11b of the first leg is asymmetric about the medullary ray of the first leg 11; The contraction section 12b of the 2nd leg is asymmetric about the medullary ray of the 2nd leg 12. It should be noted that, although the contraction section in Fig. 1 is symmetrical about the neutral wire of its place leg, contraction section in Fig. 3 is asymmetric about the neutral wire of its place leg, but, it can be seen that the figure of the contraction section of the figure of the contraction section of the first leg and the 2nd leg is symmetrical about the medullary ray of U-shaped conductor from Fig. 1 and Fig. 3.
It should be noted that, the contraction section of above-mentioned narrowed width can be provided with depression on the single side at the contraction section place of the first leg 11 and the 2nd leg 12 or two side, such as, in Fig. 1, the contraction section 11a of the first leg and the contraction section 12a of the 2nd leg is on two side and is provided with depression; In Fig. 3, the contraction section 11b of the first leg and the contraction section 12b of the 2nd leg is on single side to be provided with depression.
The first Magnetic Sensor 20 and the 2nd Magnetic Sensor 30 in the utility model can be the one in anisotropic magnetoresistive (AMR), huge magnetic impedance (GMR), tunnel magneto (TMR), hall sensing device.
Above-mentioned explanation has fully disclosed embodiment of the present utility model. It is noted that be familiar with the scope that any change that embodiment of the present utility model done by person skilled in art does not all depart from claim book of the present utility model. Correspondingly, the scope of claim of the present utility model is also not limited only to previous embodiment.
Claims (9)
1. a single-chip current sensor, it detects described determined electric current according to the magnetic induction density that determined electric current produces, it is characterised in that, it comprises integrated conductor on the same chip, the first Magnetic Sensor, the 2nd Magnetic Sensor,
Described conductor is used for flowing through passage for determined electric current provides, and enables determined electric current flow through this conductor;
First Magnetic Sensor and the 2nd Magnetic Sensor are positioned at around conductor, to form difference output;
Conductor exists the contraction section of narrowed width.
2. single-chip current sensor according to claim 1, it is characterised in that,
Described conductor comprises the first leg two leg parallel with the first leg and connects the connection section of the first leg and the 2nd leg,
The direction of the determined electric current flow through on the first leg and the 2nd leg is contrary,
First Magnetic Sensor and the 2nd Magnetic Sensor lay respectively at the first leg and the top of the 2nd leg; Or first Magnetic Sensor and the 2nd Magnetic Sensor lay respectively at the first leg and the lower section of the 2nd leg,
The contraction section of narrowed width is there is respectively at the first leg and the 2nd leg.
3. single-chip current sensor according to claim 2, it is characterised in that,
First Magnetic Sensor is between the contraction section being positioned at the first leg and connection section;
2nd Magnetic Sensor is between the contraction section being positioned at the 2nd leg and connection section.
4. single-chip current sensor according to claim 3, it is characterised in that,
The contraction section of the first leg is symmetrical about the medullary ray of the first leg;
The contraction section of the 2nd leg is symmetrical about the medullary ray of the 2nd leg.
5. single-chip current sensor according to claim 3, it is characterised in that,
The non-medullary ray about the first leg of the contraction section of the first leg is symmetrical;
The non-medullary ray about the 2nd leg of the contraction section of the 2nd leg is symmetrical.
6. single-chip current sensor according to claim 3, it is characterised in that,
The figure of the figure of the contraction section of the first leg and the contraction section of the 2nd leg is symmetrical about the medullary ray of described conductor.
7. according to the arbitrary described single-chip current sensor of claim 1-6, it is characterised in that,
Described conductor is U-shaped conductor,
It is provided with insulation layer between described conductor and the first Magnetic Sensor, the 2nd Magnetic Sensor.
8. single-chip current sensor according to claim 2, it is characterised in that,
Described Magnetic Sensor is anisotropic magnetoresistive, huge magnetic impedance, tunnel magneto or hall sensing device.
9. single-chip current sensor according to claim 2, it is characterised in that,
One end that first leg is not connected with connection section is provided with some solder joints,
One end that 2nd leg is not connected with connection section is provided with some solder joints.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521029264.6U CN205280795U (en) | 2015-12-10 | 2015-12-10 | Single chip current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521029264.6U CN205280795U (en) | 2015-12-10 | 2015-12-10 | Single chip current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205280795U true CN205280795U (en) | 2016-06-01 |
Family
ID=56065359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521029264.6U Withdrawn - After Issue CN205280795U (en) | 2015-12-10 | 2015-12-10 | Single chip current sensor |
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| Country | Link |
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| CN (1) | CN205280795U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510675A (en) * | 2015-12-10 | 2016-04-20 | 美新半导体（无锡）有限公司 | Single-chip current sensor |
| CN106353561A (en) * | 2016-09-12 | 2017-01-25 | 上海兴工微电子有限公司 | Current detection chip and current detection method |
| CN110118891A (en) * | 2019-05-31 | 2019-08-13 | 四川英杰电气股份有限公司 | Electric current detecting method, device end and readable storage medium storing program for executing |
-
2015
- 2015-12-10 CN CN201521029264.6U patent/CN205280795U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510675A (en) * | 2015-12-10 | 2016-04-20 | 美新半导体（无锡）有限公司 | Single-chip current sensor |
| CN105510675B (en) * | 2015-12-10 | 2018-06-15 | 美新半导体（无锡）有限公司 | single-chip current sensor |
| CN106353561A (en) * | 2016-09-12 | 2017-01-25 | 上海兴工微电子有限公司 | Current detection chip and current detection method |
| CN106353561B (en) * | 2016-09-12 | 2019-04-26 | 上海兴工微电子有限公司 | Current detecting chip and electric current detecting method |
| CN110118891A (en) * | 2019-05-31 | 2019-08-13 | 四川英杰电气股份有限公司 | Electric current detecting method, device end and readable storage medium storing program for executing |
| CN110118891B (en) * | 2019-05-31 | 2021-03-16 | 四川英杰电气股份有限公司 | Current detection method, device terminal and readable storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170418 Address after: 214000 Jiangsu city of Wuxi province Qingyuan new Wu District Road No. 18 Taihu International Science Park sensor network university science and Technology Park 530 Building No. A211 Patentee after: Memsic Transducer Systems Co., Ltd. Address before: 214000 Wuxi national high tech Industrial Development Zone, Hui Hui Road, No. 2, No. Patentee before: Meixin Semi-conductor (Wuxi) Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP03 | Change of name, title or address |
Address after: 214000 Jiangsu city of Wuxi province Quxin Wu Hui new Ring Road No. 2 Patentee after: New sensing system Co., Ltd. Address before: 214000 Jiangsu city of Wuxi province Qingyuan new Wu District Road No. 18 Taihu International Science Park sensor network university science and Technology Park 530 Building No. A211 Patentee before: Memsic Transducer Systems Co., Ltd. |
|
| CP03 | Change of name, title or address | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160601 Effective date of abandoning: 20180615 |
|
| AV01 | Patent right actively abandoned |