CN111208334A - Current sensor - Google Patents
Current sensor Download PDFInfo
- Publication number
- CN111208334A CN111208334A CN201811394302.6A CN201811394302A CN111208334A CN 111208334 A CN111208334 A CN 111208334A CN 201811394302 A CN201811394302 A CN 201811394302A CN 111208334 A CN111208334 A CN 111208334A
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- China
- Prior art keywords
- magnetic core
- current sensor
- circuit board
- printed circuit
- hall chip
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a current sensor, which comprises a magnetic core, a Hall chip, a printed circuit board and a compression joint spring plate, wherein the magnetic core is provided with an air gap; the magnetic core is provided with a magnetic core, the magnetic core is provided with a magnetic core. The current sensor provided by the invention realizes effective grounding of the magnetic core, ensures the measurement precision and is convenient to assemble.
Description
Technical Field
The invention relates to the technical field of current detection, in particular to a current sensor.
Background
With the development of power electronic technology, the power level, the voltage level and the current level of a motor controller of a new energy automobile are gradually increased. In a motor controller of a new energy automobile, current measurement and control are taken as key functions, so that higher requirements on the consistency and reliability of a current sensor are provided, and the current sensor is required to keep higher measurement accuracy in a wider temperature range.
The Hall current sensor can realize the isolation of the primary current and the test circuit, has the advantages of wide measurement range, high precision, good linearity, short response time, strong overload capacity and the like, and is widely applied to a motor controller. The Hall current sensor mainly comprises a Hall chip, a magnetic core with an air gap and a filter circuit. The magnetic core of the Hall current sensor is made of soft magnetic materials with air gaps, and the common soft magnetic materials comprise ferrite, permalloy, silicon steel sheets and the like.
The sensor magnetic core manufactured by the silicon steel sheet lamination riveting process is easy to generate parasitic capacitance with a copper bar passing through a window of the magnetic core, the magnetic core and the ground, and the magnetic core and a Hall chip circuit because the material of the sensor magnetic core has high conductivity. Because the Hall current sensor is positioned on an alternating current copper bar of the motor controller, when the voltage on the alternating current copper bar changes or a high-frequency voltage signal passes through, the potential of the parasitic capacitor changes, and then the Hall chip measuring circuit is interfered or has errors in measurement. To ensure that the hall sensor can properly measure the current on the ac copper bar, the magnetic core is typically grounded. Typical grounding methods are in the forms of a magnetic core welded conductor, a magnetic core slotted riveting conductor, a magnetic core perforated crimping conductor and the like, however, the magnetic permeability of the silicon steel sheet is influenced by the grounding methods, and therefore, the magnetic path of the sensor is influenced, and the measurement accuracy is influenced. Therefore, the grounding of the current sensor magnetic core has important significance for ensuring the measurement accuracy of the current sensor magnetic core.
Disclosure of Invention
In order to solve the above problems, the present invention provides a current sensor capable of providing an effective magnetic core ground connection and ensuring the measurement accuracy thereof.
In order to achieve the purpose, the current sensor comprises a magnetic core, a Hall chip, a printed circuit board and a compression joint spring plate, wherein the magnetic core is provided with an air gap, the Hall chip is arranged in the air gap, and the Hall chip is fixedly welded on the printed circuit board; the magnetic core is provided with a magnetic core, the magnetic core is provided with a magnetic core.
Preferably, the compression joint elastic sheet comprises a base part and an elastic contact part, the base part is fixed on the printed circuit board in a welding mode, and the elastic contact part abuts against the magnetic core.
Preferably, the compression joint elastic sheet is formed by bending a long strip-shaped metal elastic sheet.
Preferably, the surface of the hall chip is parallel to the end face of the magnetic core.
Preferably, the hall chip and the printed circuit board are in a vertical state.
Preferably, the printed circuit board is parallel to a bottom or front surface of the magnetic core.
The current sensor provided by the invention realizes effective grounding of the magnetic core, ensures the measurement precision and is convenient to assemble.
Drawings
FIG. 1 is a schematic view of a current sensor according to an embodiment of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is an enlarged view of the pressing spring plate in FIG. 2;
fig. 4 is a schematic view of a current sensor according to another embodiment of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings.
As shown in fig. 1 to 3, the current sensor of the present invention includes a magnetic core 10, a hall chip 30, a printed circuit board 20, and a crimping spring plate 40, wherein the magnetic core 10 is provided with an air gap 11, the hall chip 30 is disposed in the air gap 11, the hall chip 30 is welded and fixed on the printed circuit board 20, and the printed circuit board 20 is configured to provide a power supply for the hall chip 30 and is configured to output a measurement signal of the hall chip 30. The power of the hall chip 30 is supplied from an external power source through the printed circuit board 20, and the output voltage of the hall chip 30 is fed back to the external signal receiving circuit through the printed circuit board 20.
The printed circuit board 20 is provided with a ground terminal (not shown), the press-connection elastic sheet 40 is arranged between the magnetic core 10 and the printed circuit board 20 and respectively connected with the magnetic core 10 and the printed circuit board 20, and the press-connection elastic sheet 40 is electrically connected with the ground terminal.
The pressing elastic sheet 40 includes a base portion 41 and an elastic contact portion 42, the base portion 41 is fixed on the printed circuit board 20 by welding, and the elastic contact portion 42 abuts against the magnetic core 10, so that the elastic contact portion 42 and the magnetic core 10 maintain elastic contact. It will be appreciated by those skilled in the art that to ensure the effectiveness of grounding of the core 20, the resilient contact portion 42 will typically deform to some extent when abutting the core 10. Adopt crimping shell fragment 40 realizes the ground connection of current sensor magnetic core 10, compares with traditional magnetic core ground connection mode, has avoided the influence of ground conductor to the magnetic circuit performance, has reduced the installation degree of difficulty simultaneously, has improved production efficiency.
In an embodiment of the present invention, the pressing spring 40 is formed by bending a strip-shaped metal spring. The metal elastic sheet can be a copper sheet or other good conductors such as a stainless steel elastic sheet.
The air gap 11 is formed between the two end surfaces 12 of the magnetic core 10, and in one embodiment of the present invention, the surface of the hall chip 30 is parallel to the end surfaces of the magnetic core 10, so as to ensure that the magnetic lines of force of the magnetic core 10 vertically pass through the hall chip 30.
In one embodiment of the present invention, the hall chip 30 is perpendicular to the printed circuit board 20 to ensure that the hall chip 30 is correctly mounted in the air gap 11.
One or more crimping elastic sheets 40 can be arranged according to the requirement, wherein when one crimping elastic sheet 40 is adopted, the crimping elastic sheet can be arranged on one side of the Hall chip 30, and if a plurality of crimping elastic sheets 40 are adopted, the crimping elastic sheets can be arranged on one side or two sides of the Hall chip 30; the adoption of a plurality of compression joint elastic sheets 40 can realize the grounding redundancy, and further improve the grounding reliability of the magnetic core 10.
According to the current sensor, the magnetic core 10 is usually formed by riveting or winding silicon steel laminations, and when the conductive copper bar 50 penetrates through the window 13 of the magnetic core 10, parasitic capacitances exist between the copper bar 50 and the magnetic core 10, between the magnetic core 10 and the ground, and between the magnetic core 10 and a Hall measurement circuit. When the copper bar 10 is interfered by a high-frequency voltage signal, the potential of the magnetic core 10 is changed, so that the signal of the hall measuring circuit is influenced. By grounding the magnetic core 10, the potential of the magnetic core 10 can be clamped at zero potential, thereby shielding the interference of high-frequency voltage signals on the copper bar 50.
In the current sensor according to one embodiment of the present invention shown in fig. 1 and 2, the printed circuit board 20 is parallel to the bottom surface of the magnetic core 10, that is, the printed circuit board 20 is disposed at the bottom of the magnetic core 10. In fig. 3, another embodiment of the present invention is shown, in which the printed circuit board 20 is parallel to the front surface of the magnetic core 10.
In the current sensor, the compression joint elastic sheet 40 can be welded on the printed circuit board 20, and is convenient to mount during mass production; the magnetic core 10 and the compression joint elastic sheet 40 are in elastic contact, so that the flexibility of installation of the magnetic core 10 of the sensor can be realized, the effective grounding of the magnetic core 10 is ensured, and the influence of the grounding on a magnetic circuit of the sensor is avoided.
As described above, exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings. It should be understood that the invention is not intended to be limited to these specific details. Equivalent or similar changes in the structure and features of the exemplary embodiments may be made without departing from the spirit and scope of the invention, which shall also fall within the scope of the protection defined by the claims appended hereto.
Claims (6)
1. A current sensor is characterized by comprising a magnetic core, a Hall chip, a printed circuit board and a compression joint spring plate,
the magnetic core is provided with an air gap, the Hall chip is arranged in the air gap, and the Hall chip is welded and fixed on the printed circuit board;
the magnetic core is provided with a magnetic core, the magnetic core is provided with a magnetic core.
2. The current sensor according to claim 1, wherein the press-fit spring plate includes a base portion and an elastic contact portion, the base portion is fixed to the printed circuit board by soldering, and the elastic contact portion abuts against the magnetic core.
3. The current sensor of claim 1, wherein the crimp tabs are formed by bending elongated metal tabs.
4. The current sensor of claim 1, wherein a surface of the hall chip is parallel to an end face of the magnetic core.
5. The current sensor of claim 1, wherein the hall chip is perpendicular to the printed circuit board.
6. The current sensor of claim 1, wherein the printed circuit board is parallel to the bottom or front surface of the magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811394302.6A CN111208334A (en) | 2018-11-21 | 2018-11-21 | Current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811394302.6A CN111208334A (en) | 2018-11-21 | 2018-11-21 | Current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111208334A true CN111208334A (en) | 2020-05-29 |
Family
ID=70783926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811394302.6A Pending CN111208334A (en) | 2018-11-21 | 2018-11-21 | Current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111208334A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415251A (en) * | 2020-11-04 | 2021-02-26 | 汉华智能科技(佛山)有限公司 | High dynamic range alternating current/direct current isolation measurement method for measuring instrument |
| CN113607987A (en) * | 2021-07-30 | 2021-11-05 | 重庆长安汽车股份有限公司 | Current sensor structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2475256Y (en) * | 2001-02-08 | 2002-01-30 | 林德政 | ground shrapnel |
| US20020062969A1 (en) * | 1998-12-25 | 2002-05-30 | Izuru Kumagai | Earth ground terminal |
| JP2014066691A (en) * | 2012-09-25 | 2014-04-17 | Kohshin Electric Corp | Electric current sensor |
| US20140253100A1 (en) * | 2011-07-13 | 2014-09-11 | Lem Intellectual Property Sa | Electrical current sensor with grounded magnetic core |
| CN105008947A (en) * | 2013-03-05 | 2015-10-28 | 大陆汽车有限责任公司 | Current sensor device with integrated clamping device and grounding element |
| CN106104281A (en) * | 2014-03-21 | 2016-11-09 | 莱姆知识产权股份有限公司 | Magnetic field sensor device and the current converter with it |
| CN106205985A (en) * | 2016-07-21 | 2016-12-07 | 昆山凯迪汽车电器有限公司 | Turbocharging ignition coil |
-
2018
- 2018-11-21 CN CN201811394302.6A patent/CN111208334A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020062969A1 (en) * | 1998-12-25 | 2002-05-30 | Izuru Kumagai | Earth ground terminal |
| CN2475256Y (en) * | 2001-02-08 | 2002-01-30 | 林德政 | ground shrapnel |
| US20140253100A1 (en) * | 2011-07-13 | 2014-09-11 | Lem Intellectual Property Sa | Electrical current sensor with grounded magnetic core |
| JP2014066691A (en) * | 2012-09-25 | 2014-04-17 | Kohshin Electric Corp | Electric current sensor |
| CN105008947A (en) * | 2013-03-05 | 2015-10-28 | 大陆汽车有限责任公司 | Current sensor device with integrated clamping device and grounding element |
| CN106104281A (en) * | 2014-03-21 | 2016-11-09 | 莱姆知识产权股份有限公司 | Magnetic field sensor device and the current converter with it |
| CN106205985A (en) * | 2016-07-21 | 2016-12-07 | 昆山凯迪汽车电器有限公司 | Turbocharging ignition coil |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415251A (en) * | 2020-11-04 | 2021-02-26 | 汉华智能科技(佛山)有限公司 | High dynamic range alternating current/direct current isolation measurement method for measuring instrument |
| CN113607987A (en) * | 2021-07-30 | 2021-11-05 | 重庆长安汽车股份有限公司 | Current sensor structure |
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Application publication date: 20200529 |
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| RJ01 | Rejection of invention patent application after publication |