CN116868064A - Current sensor and current sensing system for vehicle - Google Patents
Current sensor and current sensing system for vehicle Download PDFInfo
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- CN116868064A CN116868064A CN202180093044.1A CN202180093044A CN116868064A CN 116868064 A CN116868064 A CN 116868064A CN 202180093044 A CN202180093044 A CN 202180093044A CN 116868064 A CN116868064 A CN 116868064A
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- 230000006698 induction Effects 0.000 claims abstract description 22
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 claims description 23
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 13
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 239000000696 magnetic material Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
A current sensor, comprising: a magnet (1) in which a set region having a magnetic induction intensity of substantially zero exists in a magnetic field generated by the magnet (1); and a sensing chip (2), wherein the sensing chip (2) is arranged in the setting area and is used for determining the current intensity of the current to be measured by sensing the change of the magnetic induction intensity at the setting area. In this way, the sensing chip (2) can sensitively sense the influence of the current to be measured on the magnetic field at this region, so that it is not necessary to pass the current conducting medium (for example, bus bar B) through the magnet (1) for the current to be measured to flow, so that the size of the current sensor can be effectively reduced, and the waste of the installation space is never caused. A current sensing system for a vehicle including a current sensor is also provided.
Description
The present invention relates to the field of current sensing. In particular, the present invention relates to a current sensor and a current sensing system for a vehicle including the same.
In a vehicle, three current sensors are typically used in a Power Electronics Unit (PEU) to monitor the current input to the motor. Examples of such current sensors are shown in fig. 1a and 1b, respectively.
As shown in fig. 1a, a magnet 10 of a current sensor is made of soft magnetic material and has a C-shape as a whole, and a sense die 20 is located at a notch of the magnet 10. Due to the material and shape, the current conducting medium (e.g., bus bar B) must penetrate into the magnet 10 via the central bore of the magnet 10. This requires making the overall size of the current sensor large, resulting in difficulty in installation and waste of installation space.
As shown in fig. 1b, the magnet 10 of the alternative current sensor is also made of soft magnetic material and has a U-shape overall, the sense die 20 being located in the gap between the two extensions of the magnet 10. For reasons similar to the current sensor in fig. 1a, the current conducting medium (e.g. busbar B) penetrates the magnet 10 via the gap between the two extensions of the U-shape. This requires making the overall size of the current sensor large, which also results in difficulty in installation and waste of installation space.
Disclosure of Invention
The present invention has been made in view of the above-mentioned drawbacks of the prior art. An object of the present invention is to provide a current sensor that can be reduced in size more effectively than the structure of the current sensor of the related art, without wasting installation space. Another object of the present invention is to provide a current sensing system for a vehicle including the above-described current sensor, which makes installation of the current sensing system for a vehicle convenient.
In order to achieve the above object, the present invention adopts the following technical scheme.
The present invention provides a current sensor comprising:
a magnet having a set region with a magnetic induction intensity of substantially zero in a magnetic field generated by the magnet; and
the sensing chip is arranged in the setting area and is used for determining the current intensity of the current to be measured by sensing the change of the magnetic induction intensity at the setting area.
Preferably, the magnet has a base and two protrusions extending from the base in the same direction and spaced apart from each other such that the magnet has a U-shaped cross section.
More preferably, free ends of the two extensions remote from the base form one of the N-pole and S-pole of the magnet, and ends of the base remote from the extensions form the other of the N-pole and S-pole of the magnet, such that the placement area is located between the two extensions.
More preferably, the sensing chip is a hall element, and the sensing chip is disposed in the disposition region such that a sensing surface thereof is substantially orthogonal to a magnetic induction line of a magnetic field generated by the current to be measured.
More preferably, the magnet is integrally formed in a rectangular parallelepiped shape, and has a cutout portion penetrating in a first direction, the cutout portion being open at one surface in a second direction of the magnet, the second direction being orthogonal to the first direction, the arrangement region being located in the cutout portion.
More preferably, the current sensor further includes a PCBA assembly disposed at one side of the magnet in the first direction, and the PCBA assembly is connected with the sensing chip.
More preferably, the other side of the magnet in the first direction is formed as a fixing surface for fixing with a bus bar through which the current to be measured flows, and a flow direction of the current in the bus bar is substantially orthogonal to the first direction and the second direction.
More preferably, the overall dimension of the current sensor in the first direction is less than 15mm; and/or
The magnet has a dimension in a third direction orthogonal to the first and second directions of less than 20mm.
More preferably, the PCBA component has a dimension in the second direction that is greater than a dimension of the magnet in the second direction, and/or
The PCBA component has a dimension in a third direction orthogonal to the first and second directions that is equal to a dimension of the magnet in the third direction.
The present invention also provides a current sensing system for a vehicle, including:
at least one current sensor according to any one of the above aspects; and
and a bus bar fixed to the magnet of the current sensor so as not to pass through the magnet.
By adopting the technical scheme, the invention provides a novel current sensor and a current sensing system for a vehicle, wherein the current sensor comprises the same. In the current sensor, a sense chip for sensing the current intensity is provided in a region where the magnetic induction intensity of the magnet is substantially zero. In this way, the sensing chip can sensitively sense the influence of the current to be measured on the magnetic field at the area, so that a current conducting medium (such as a bus) for the current to be measured to flow through is not required to pass through the magnet, the size of the current sensor can be effectively reduced, and the waste of installation space is avoided; also, in the current sensing system for a vehicle, since the conductive medium (e.g., bus bar) is fixed to the magnet so as not to pass through the magnet, the problem of difficulty in installation of the current sensing system is avoided, so that the current sensing system can be installed by fixing the bus bar, and the installation is convenient.
FIG. 1a is a schematic diagram showing the structural layout of both a current sensor and its corresponding bus bar; fig. 1b is a schematic diagram showing the structural layout of both another current sensor and its corresponding bus bar.
FIG. 2a is a schematic diagram showing the structure of a current sensor according to an embodiment of the present invention; FIG. 2b is a schematic diagram showing the structural layout of both the magnet and the sense die of the current sensor of FIG. 2 a; fig. 2c is a schematic diagram showing the structure of the magnet of the current sensor in fig. 2 a.
Fig. 3 is a schematic diagram showing the structure of a current sensing system including the current sensor in fig. 2 a.
Description of the reference numerals
10 magnet 20 sensing chip
1 magnet 11 base 12 extension 1c notch 1s fixed surface P magnetic induction intensity zero point D1 first direction D2 second direction D3 third direction 2 sense chip 3PCBA component
And B, bus bar.
Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific illustrations are for the purpose of illustrating how one skilled in the art may practice the invention, and are not intended to be exhaustive of all of the possible ways of practicing the invention, nor to limit the scope of the invention.
The structure of a current sensor according to an embodiment of the present invention will be described below with reference to the drawings.
(Structure of a Current sensor according to an embodiment of the invention)
As shown in fig. 2a to 2c, a current sensor according to an embodiment of the present invention includes a magnet 1, a sensing chip 2, and a PCBA assembly 3. In the magnetic field generated by the magnet 1, there is a point where the magnetic induction is zero, and the magnetic induction of a part of the region including the point is substantially zero. In the present invention, "approximately" is understood to mean a case where the magnetic induction fluctuates by a small amount within an error range recognized by those skilled in the art. The sense chip 2 is provided in this partial region (hereinafter referred to as a set region) for sensing a change in magnetic induction intensity at the set region due to a current flowing through a current-conducting medium (e.g., a bus bar) to determine the intensity of the current flowing through the current-conducting medium. The sensing chip 2 is connected to the PCBA assembly 3 by soldering through a plurality of pins for transferring signals and the like between the sensing chip 2 and the PCBA assembly 3.
In the present embodiment, the magnet 1 is formed in a rectangular parallelepiped shape as a whole and has a first direction D1 (front-rear direction in fig. 2a to 2 c), a second direction D2 (up-down direction in fig. 2a to 2 c), and a third direction D3 (left-right direction in fig. 2a to 2 c) orthogonal to each other. The magnet 1 has a cutout portion 1c having a rectangular parallelepiped shape penetrating in the first direction D1, and the cutout portion 1c is open at one surface (lower surface in fig. 2b and 2 c) of the magnet 1 in the second direction D2. By adopting the above-described structure, in the present embodiment, the magnet 1 includes the base 11 located above in the second direction D2 and the two protruding portions 12 extending from the base 11 toward the lower side in the second direction D2. The two protruding portions 12 are separated by the notch portion 1c, and the two protruding portions 12 are connected to both end portions of the base 11 in the third direction D3 such that the magnet 1 has a U-shape in a cross section of the magnet 1 taken along the second direction D2 and the third direction D3.
Further, the free ends of the two extensions 12 remote from the base 11 form the N-pole of the magnet 1, and the ends of the base 11 remote from the extensions 12 (upper ends in fig. 2b and 2 c) form the S-pole of the magnet 1. In this way, in the magnetic field formed by the magnet 1, the magnetic induction zero point P (at which the magnetic induction is zero) is located in the notched portion 1c sandwiched by the two protruding portions 12, and the installation region including the magnetic induction zero point P is also located in the notched portion 1 c. If the position of the setting region (i.e. the position of the magnetic induction zero point P) needs to be adjusted, this can be achieved by changing at least one of the following dimensions: the dimension W1 of the notch portion 1c of the magnet 1 in the third direction D3, the overall dimension W2 of the magnet 1 in the third direction D3, and the overall dimension W3 of the magnet 1 in the second direction D2.
In the present embodiment, as shown in fig. 2b, the sense die 2 is a hall element and the sense die 2 protrudes into the notch portion 1c from the rear in the first direction D1 up to the setting region including the magnetic induction intensity zero point P. Further, the sense die 2 is arranged in the arrangement region in such a manner that its sense face is substantially orthogonal to the second direction D2. In practice, the sensing chip 2 may be inserted into the notch portion 1c from any direction and disposed in the disposition region as long as the sensing surface of the sensing chip 2 can be substantially orthogonal to the magnetic induction lines of the magnetic field generated by the current to be measured flowing through the bus bar in the layout of the current sensing system.
In the present embodiment, the PCBA assembly 3 includes a printed circuit board and electronic components provided on the printed circuit board, and the PCBA assembly 3 does not substantially affect the magnetic field of the magnet 1 and the magnetic field of the current flowing through the bus bar B. The PCBA assembly 3 is disposed behind the magnet 1 in the first direction D1, and the PCBA assembly 3 and the sense die 2 are connected by soldering via a plurality of pins. In addition, the PCBA assembly 3 may also be connected to other devices (e.g., the power electronics unit of a vehicle) via a further plurality of pins to thereby transfer electrical signals to the other devices.
Furthermore, in order to minimize the space occupied by the current sensor, the dimension W5 of the current sensor in the first direction D1, that is, the overall dimension of both the magnet 1 and the PCBA assembly 3 in the first direction D1 (including the dimension W4 of the magnet 1 in the first direction D1 and the dimension of the PCBA assembly 3 in the first direction D1; and also including the space between the magnet 1 and the PCBA assembly 3 if there is a space between them) is preferably less than 15mm; moreover, the dimension W6 of the PCBA component 3 in the third direction D3 may be equal to the dimension W2 of the magnet 1 in the third direction D3, which dimensions W2, W6 are preferably smaller than 20mm. To achieve a proper connection of all pins, the dimension W7 of the PCBA component 3 in the second direction D2 may be larger than the dimension W3 of the magnet 1 in the second direction D2.
The following describes the structure of a current sensing system for a vehicle according to the present invention including the above-described current sensor.
(Structure of current sensing system for vehicle according to the present invention)
As shown in fig. 2a to 3, the current sensing system according to the present invention includes the above-described current sensor and the bus bar B fixed together. In the current sensor, the PCBA component 3 is located rearward of the magnet 1 in the first direction D1, and a front side surface of the magnet 1 in the first direction D1 is formed as a fixing surface 1s fixed to the bus bar B through which the current to be sensed flows. The bus bar B and the fixing surface 1s of the magnet 1 are integrally formed by injection molding or the like. Further, in the case where the magnet 1 of the current sensor is formed integrally with the bus bar B, the flow direction of the current in the bus bar B is made substantially coincident with the third direction D3, so that the magnetic flux lines of the magnetic field generated by the current in the bus bar B pass through the sensing surface of the sensing chip 2 in a substantially orthogonal manner, thereby ensuring the sensitivity and accuracy of the sensing result.
Further, by fixing the bus bar B to another device (for example, a power electronics unit of a vehicle), the entire current sensing system for a vehicle can be conveniently fixed to the device, and thus the installation is convenient.
It should be understood that the above-described embodiments are merely exemplary and are not intended to limit the present invention. Those skilled in the art can make various modifications and changes to the above-described embodiments without departing from the scope of the present invention. The following supplementary explanation is made.
(i) In the course of the inventor's conception of the technical solution of the present invention, the inventor considered that the existing current sensors for vehicles (such as the current sensors shown in fig. 1a and 1B) all sense the current intensity by collecting the magnetic field using a soft magnetic material, and the current conducting medium (bus bar B) must be designed to match the magnet 10 of the sensor, which would lead to installation problems and space waste problems.
There are actually at least two other optimizations for the above problem, one is not to use a specially shaped magnet 1 as shown in fig. 1a and 1b to collect the magnetic field, but this approach easily leads to electromagnetic compatibility problems, as other magnetic fields of the surrounding environment can very easily invade the sensing area of the sensing chip 2, thus interfering with the measurement results; another is to use giant magneto-resistive current sensors to achieve current sensing, but this approach is very costly. Accordingly, the inventors of the present invention have achieved a low-cost and less susceptible to external disturbances scheme to sense the current flowing through bus B, instead of employing both schemes.
(ii) Although in the above embodiments it is described that the setting region including the magnetic induction zero point P is obtained by using the magnet 1 of a specific shape as shown in fig. 2c, the present invention is not limited thereto, and the setting region including the magnetic induction zero point may be obtained by using the magnet 1 of another shape.
Further, in the above embodiment, it was explained that the free ends of the two protruding portions 12 away from the base portion 11 form the N pole of the magnet 1 and the ends of the base portion 11 (the upper ends in fig. 2b and 2 c) away from the protruding portions 12 form the S pole of the magnet 1, but the present invention is not limited thereto. Alternatively, the free ends of the two extensions 12 form the S-pole of the magnet 1 and the end of the base 11 facing away from the extensions 12 forms the N-pole of the magnet 1.
Claims (10)
- A current sensor, comprising:a magnet (1) in which a set region having a magnetic induction intensity of substantially zero exists in a magnetic field generated by the magnet (1); andand the sensing chip (2) is arranged in the setting area and is used for determining the current intensity of the current to be measured by sensing the change of the magnetic induction intensity at the setting area.
- Current sensor according to claim 1, characterized in that the magnet (1) has a base (11) and two protrusions (12) extending from the base (11) towards the same direction and spaced apart from each other, such that the magnet (1) has a U-shaped cross section.
- Current sensor according to claim 2, characterized in that the free ends of the two extensions (12) remote from the base (11) form one of the N-pole and S-pole of the magnet (1), the ends of the base (11) remote from the extensions (12) forming the other of the N-pole and S-pole of the magnet (1) such that the setting area is located between the two extensions (12).
- A current sensor according to claim 3, wherein the sensing chip (2) is a hall element, and the sensing chip (2) is disposed in the disposition region such that a sensing surface thereof is substantially orthogonal to a magnetic induction line of a magnetic field generated by the current to be measured.
- The current sensor according to any one of claims 2 to 4, characterized in that the magnet (1) is formed in a rectangular parallelepiped shape as a whole, and has a notch portion (1 c) penetrating in a first direction (D1), the notch portion (1 c) being open at one surface in a second direction (D2) of the magnet (1), the second direction (D2) being orthogonal to the first direction (D1), the arrangement region being located in the notch portion (1 c).
- The current sensor according to claim 5, further comprising a PCBA assembly (3), wherein the PCBA assembly (3) is arranged to one side of the magnet (1) in the first direction (D1), and wherein the PCBA assembly (3) is connected to the sensing chip (2).
- The current sensor according to claim 6, characterized in that the other side of the magnet (1) in the first direction (D1) is formed as a fixing surface (1 s) for fixing with a busbar (B) through which the current to be measured flows, the flow direction of the current in the busbar (B) being substantially orthogonal to the first direction (D1) and the second direction (D2).
- A current sensor according to claim 6 or 7, characterized in that,the overall dimension (W5) of the current sensor in the first direction (D1) is less than 15mm; and/orThe magnet (1) has a dimension (W2) in a third direction (D3) orthogonal to the first direction (D1) and the second direction (D2) of less than 20mm.
- The current sensor according to any one of claims 6 to 8, characterized in that,a dimension (W7) of the PCBA component (3) in the second direction (D2) is larger than a dimension (W3) of the magnet (1) in the second direction (D2), and/or-a dimension (W6) of the PCBA component (3) in a third direction (D3) orthogonal to the first direction (D1) and the second direction (D2) is equal to a dimension (W2) of the magnet (1) in the third direction (D3).
- A current sensing system for a vehicle, comprising:at least one current sensor according to any one of claims 1 to 9; andand a bus bar (B) that is fixed to the magnet (1) so as not to pass through the magnet (1) of the current sensor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2021/083945 WO2022204936A1 (en) | 2021-03-30 | 2021-03-30 | Current sensor and vehicle current sensing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116868064A true CN116868064A (en) | 2023-10-10 |
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ID=83455386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180093044.1A Pending CN116868064A (en) | 2021-03-30 | 2021-03-30 | Current sensor and current sensing system for vehicle |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116868064A (en) |
| WO (1) | WO2022204936A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5641276B2 (en) * | 2009-07-02 | 2014-12-17 | 甲神電機株式会社 | Current sensor |
| JP2013148512A (en) * | 2012-01-20 | 2013-08-01 | Aisin Seiki Co Ltd | Current sensor |
| JP6372969B2 (en) * | 2012-12-03 | 2018-08-15 | 矢崎総業株式会社 | Current sensor |
| WO2016006410A1 (en) * | 2014-07-07 | 2016-01-14 | アルプス・グリーンデバイス株式会社 | Current sensor |
| JP6375020B2 (en) * | 2017-06-13 | 2018-08-15 | 株式会社タムラ製作所 | Current sensor device |
| JP6598040B2 (en) * | 2018-06-01 | 2019-10-30 | 日立金属株式会社 | Current detection structure |
| DE102019124405A1 (en) * | 2019-09-11 | 2021-03-11 | Schaeffler Technologies AG & Co. KG | CURRENT SENSOR |
-
2021
- 2021-03-30 CN CN202180093044.1A patent/CN116868064A/en active Pending
- 2021-03-30 WO PCT/CN2021/083945 patent/WO2022204936A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2022204936A1 (en) | 2022-10-06 |
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