CN117289012A - Dual-current input/output, dual-isolation current sensor and current detection method - Google Patents
Dual-current input/output, dual-isolation current sensor and current detection method Download PDFInfo
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- CN117289012A CN117289012A CN202311576228.0A CN202311576228A CN117289012A CN 117289012 A CN117289012 A CN 117289012A CN 202311576228 A CN202311576228 A CN 202311576228A CN 117289012 A CN117289012 A CN 117289012A
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- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 238000002955 isolation Methods 0.000 title claims abstract description 12
- 239000004020 conductor Substances 0.000 claims abstract description 126
- 230000009977 dual effect Effects 0.000 claims description 16
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 230000035945 sensitivity Effects 0.000 description 5
- 239000003989 dielectric material Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000005355 Hall effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
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- 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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
-
- 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 application provides a double-current input-output and double-isolation current sensor and a current detection method using the same. The dual-current input-output, dual-isolation current sensor comprises: a current conductor, a hall IC, an insulating layer, and a signal pin. The current conductors comprise a first current conductor and a second current conductor, and the first current conductor and the second current conductor are arranged on the upper side and the lower side of the Hall IC; a first insulating layer is arranged between the first current conductor and the Hall IC, and a second insulating layer is arranged between the second current conductor and the Hall IC; and the thickness of the first insulating layer is smaller than the thickness of the second insulating layer.
Description
Technical Field
The present invention relates to a current sensor, and more particularly, to a dual-current input/output, dual-isolated current sensor and a current detection method using the same.
Background
Typically, the current sensor includes a leadframe, an integrated circuit. The lead frame comprises a current conductor, wherein the current conductor comprises a current input section and a current output section. The integrated circuit includes a hall sensor that produces an output signal having an amplitude proportional to a magnetic field induced by a current flowing through the current conductor. In some typical current sensors, the current input section and a current output section form a ring with a gap, and the hall effect element is located in the gap of the ring.
The index characterizing the performance of the current sensor includes sensitivity. In order to improve the sensitivity, one known arrangement is: the substrate is arranged such that a first surface of the substrate is above the current conductor section and a second surface of the substrate is above the first surface. In other words, the substrates in the integrated circuit are arranged upside down relative to the conventional orientation. The one or more magnetic field sensors can thus be very close to the current conductor section, which results in an improved sensitivity of the current sensor, while at the same time resulting in higher demands on the isolation of the current conductors from the sensor.
On the other hand, due to the limitation of heat dissipation and the like, conventional current sensors generally only support currents below 100A, and excessive currents bring about more heat and cause breakdown of the insulating layer.
Thus, existing solutions lack a high current, high sensitivity current sensor.
Disclosure of Invention
In view of the above, the present application provides a dual-current input-output, dual-isolation current sensor, which includes two current input-output segments and a dual-isolation layer, and realizes high-current, high-sensitivity current detection.
The dual current input output, dual isolated current sensor includes:
a current conductor for transmitting a current to be detected;
a hall IC for detecting a current to be detected flowing through the current conductor;
the hall IC has opposing first and second surfaces;
the second surface is provided with a groove for accommodating at least one Hall element;
an insulating layer for isolating the current conductor from the hall IC;
the signal pin is connected with the Hall IC through a lead wire;
the current conductors comprise a first current conductor and a second current conductor, and the first current conductor and the second current conductor are arranged on the upper side and the lower side of the Hall IC; a first insulating layer is arranged between the first current conductor and the Hall IC, and a second insulating layer is arranged between the second current conductor and the Hall IC; and the thickness of the first insulating layer is smaller than the thickness of the second insulating layer.
The first current conductor and the second current conductor are of the same material and structure; the second insulating layer is a multi-layer insulating structure, and one layer in the multi-layer insulating structure is the same as the first insulating layer.
Further, the second insulating layer further includes an electromagnetic shielding layer for shielding electromagnetic interference of the second current conductor.
Further, the first current conductor includes a first current input terminal and a first current output terminal; the second current conductor comprises a second current input end and a second current output end; the first current input of the first current conductor and the second current input of the second current conductor may be connected to the same current or to different currents.
Further, when detecting a large current, the first current input terminal and the second current input terminal are electrically connected for commonly introducing the large current, and the first current output terminal and the second current output terminal are electrically connected for commonly outputting the large current.
Further, when detecting small currents, the first current conductor and the second current conductor may be electrically isolated, and the first current conductor and the second current conductor may transmit different currents, respectively.
Further, the current sensor comprises a packaging shell, a signal pin extends out of the packaging shell through an opening of the packaging shell, and the part, which does not extend out of the packaging shell, of the signal pin is connected with the Hall IC through a lead.
Further, the first current conductor and the second current conductor are disposed around the hall element.
The present application also provides a current detection method using a hall current sensor, the sensor comprising: a current conductor for transmitting a current to be detected; a hall IC for detecting a current to be detected flowing through the current conductor; the hall IC has opposing first and second surfaces; the second surface is provided with a groove for accommodating at least one Hall element; an insulating layer for isolating the current conductor from the hall IC; the current conductors comprise a first current conductor and a second current conductor which are arranged on the upper side and the lower side of the Hall IC,
firstly, judging the magnitude of a current to be detected in advance;
when detecting a large current, the first current input end and the second current input end are electrically connected and are used for commonly introducing the large current; the first current output end is electrically connected with the second current output end and is used for jointly outputting the large current; the Hall IC is used for detecting the large current;
when detecting small currents, the first current conductor and the second current conductor are electrically isolated, and the first current conductor and the second current conductor can respectively transmit different currents; the hall IC is configured to detect the different currents.
Further, the current detection method includes electrically connecting the first current input end and the second current input end in a welding manner when detecting a large current, and electrically connecting the first current output end and the second current output end in a welding manner.
The solution provided by the present application has the following improvements and advantages over the prior art:
1. by arranging the double-current input/output section, the heat dissipation performance is improved and the current detection range is increased due to the increased area of the current conductor.
2. By arranging the double insulating layers and setting the thickness of the first insulating layer to be smaller than that of the second insulating layer, high sensitivity is achieved while the insulating performance is improved. Further, the second insulating layer includes an electromagnetic shielding layer for shielding electromagnetic interference of the second current conductor.
3. When detecting large current, the double-current input and output sections are connected in parallel, so that the current detection range is improved; when detecting small current, the double-current input and output sections are electrically isolated, and the Hall IC is used for detecting different currents, so that multifunctional detection is realized.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a current sensor according to a first embodiment of the present application;
FIG. 2 is a schematic structural diagram of a current sensor according to a second embodiment of the present disclosure;
FIG. 3 is a schematic top view of the current sensor of the present application;
reference numerals:
a hall IC10; a first surface 11; a second surface 12;
a hall element 20;
a first insulating layer 31; a second insulating layer 32;
a first current conductor 41; a second current conductor 42;
current inputs 411, 421; current outputs 412, 422;
a signal pin 50; and a lead 60.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a hall current sensor provided in this embodiment includes: hall IC10, hall IC10 has opposing first and second surfaces 11, 12. The second surface 12 has a recess for receiving at least one hall element 20. The hall element 20 is a hall effect based magnetic sensor with which the magnetic field and its changes can be detected.
The hall current sensor comprises a current conductor for transmitting a current to be detected, said current conductor comprising a first current conductor 41 and a second current conductor 42. The first current conductor is arranged below the first surface 11 of the hall IC10 and the second current conductor 42 is arranged above the second surface 12. As described with reference to fig. 3, the first current conductor 41 includes a current input 411 and a current output 412; the second current conductor 42 comprises a current input 421 and a current output 422. The current input 411 and the current input 421 are located on one side of the hall current sensor, and the current output 412 and the current output 422 are located on the opposite side of the hall current sensor. The first current conductor 41 and the second current conductor 42 are disposed on both upper and lower sides of the hall IC10 and around the hall element 20, so that the hall element 20 more effectively detects the magnetic field E generated by the first current conductor 41 and the second current conductor 42 due to the current flow. Further, the first current conductor 41 and the second current conductor 42 preferably have the same material and structure, and the first current conductor 41 and the second current conductor 42 are symmetrically wound around the upper and lower sides of the hall element 20, so that the resistances of the first current conductor 41 and the second current conductor 42 are substantially equal.
According to the embodiment, the current conductors are arranged on the upper side and the lower side of the Hall IC, so that the metal area of the current conductors is increased, the heat dissipation performance is improved, and the current detection range is effectively increased.
Further, the current input 411 of the first current conductor 41 and the current input 421 of the second current conductor 42 may be connected to the same current or different currents. For example, when a large current is detected, for example, when the current exceeds 100A, the current input terminal 411 and the current input terminal 421 are commonly connected to each other, and the current output terminal are electrically connected to each other to commonly output the large current, and the magnetic field detected by the hall IC10 is the sum of the magnetic fields generated when the large current flows through the first current conductor 41 and the second current conductor. When detecting small currents, for example currents less than 50A, the first and second current conductors may be electrically isolated, in which case the first and second current conductors may each carry a different current, in which case the hall IC10 may detect magnetic fields generated by two different currents flowing through the first and second current conductors 41.
According to the current sensor, when large current is detected, the double-current input and output sections are connected in parallel, so that the current detection range is improved; when detecting small current, the double-current input and output sections are electrically isolated, and the Hall IC is used for detecting different currents, so that multifunctional detection is realized.
Because the upper side and the lower side of the Hall IC are provided with the current conductors, the electric isolation requirement of the Hall IC and the current conductors is further improved, and the electric isolation effect is improved. The insulating layer of the present embodiment includes a first insulating layer 31 and a second insulating layer 32. The first insulating layer 31 is formed of a material having high dielectric strength, such as a glass dielectric material or a silicon-based dielectric material. In some embodiments, the first insulating layer has a thickness of about 50 to 180 microns, isolating the hall IC from the current conductor at high voltage. The hall IC may be bonded to the first insulating layer 31 using an adhesive. Preferably, the adhesive is made of an insulating material.
The second insulating layer 32 is formed of a material having high dielectric strength, such as a glass dielectric material or a silicon-based dielectric material. In some embodiments, the thickness of the second insulating layer is greater than the thickness of the first insulating layer, such that on the one hand the distance of the second current conductor from the hall element is substantially equal to the distance of the first current conductor from the hall element; on the other hand, through increasing the thickness of second insulating layer, further promoted high voltage isolation effect. The second insulating layer has a thickness of about 200 to 3000 micrometers
In another embodiment, the second insulating layer is a multi-layer structure, for example, a 2-layer or 3-layer insulating structure (as shown in fig. 2), and one of the layers of the multi-layer insulating structure may be the same as the first insulating layer for high-voltage isolation of the hall IC from the current conductor. The second insulating layer may further include an electromagnetic shielding layer for shielding electromagnetic interference of the second current conductor.
A signal pin 50, the signal pin 50 being connected to the hall IC10 by a lead 60.
Further, the current sensor includes a package case, the signal pin 50 protrudes out of the package case through an opening of the package case, and a portion of the signal pin 50 that does not protrude out of the package case is connected to the hall IC10 through a lead 60.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A dual current input output, dual isolated current sensor comprising:
a current conductor for transmitting a current to be detected;
a hall IC for detecting a current to be detected flowing through the current conductor;
the hall IC has opposing first and second surfaces;
the Hall IC is provided with a groove at a position close to the second surface and is used for accommodating at least one Hall element;
an insulating layer for isolating the current conductor from the hall IC;
the signal pin is connected with the Hall IC through a lead wire;
it is characterized in that the method comprises the steps of,
the current conductors include a first current conductor disposed adjacent a first surface of the hall IC and a second current conductor disposed adjacent a second surface of the hall IC; a first insulating layer is arranged between the first current conductor and the Hall IC, and a second insulating layer is arranged between the second current conductor and the Hall IC; and the thickness of the first insulating layer is smaller than the thickness of the second insulating layer.
2. The dual current input output, dual isolated current sensor of claim 1, wherein the first current conductor and the second current conductor are of the same material and structure; the second insulating layer is a multi-layer insulating structure, and one layer in the multi-layer insulating structure is the same as the first insulating layer.
3. The dual-current-in-out, dual-isolation current sensor of claim 2, wherein said second insulating layer further comprises an electromagnetic shielding layer for shielding electromagnetic interference of said second current conductor.
4. The dual current input output, dual isolated current sensor of claim 1, wherein the first current conductor and the second current conductor each comprise a current input and a current output.
5. The dual current input output, dual isolated current sensor of claim 4 wherein when detecting a large current, the current input of the first current conductor and the current input of the second current conductor are electrically connected for commonly introducing the large current, and the current output of the first current conductor and the current output of the second current conductor are electrically connected for commonly outputting the large current.
6. The dual current input output, dual isolated current sensor of claim 4, wherein the first current conductor and the second current conductor are electrically isolated when detecting small currents, the first current conductor and the second current conductor transmitting different currents, respectively.
7. The dual current input output, dual isolated current sensor of claim 4, wherein the first current conductor and the second current conductor are disposed around the hall element.
8. The dual current input output, dual isolated current sensor of claim 1, wherein the current sensor comprises a package housing;
the signal pins extend out of the packaging shell through openings of the packaging shell, and the parts, which do not extend out of the packaging shell, of the signal pins are connected with the Hall IC through leads.
9. A current detection method using a hall current sensor, the sensor comprising: a current conductor for transmitting a current to be detected; a hall IC for detecting a current to be detected flowing through the current conductor; the hall IC has opposing first and second surfaces; the second surface is provided with a groove for accommodating at least one Hall element; an insulating layer for isolating the current conductor from the hall IC; the current conductors comprise a first current conductor and a second current conductor, which are arranged on the upper side and the lower side of the Hall IC, and the Hall IC is characterized in that,
firstly, judging the magnitude of a current to be detected in advance;
when detecting a large current, the current input end of the first current conductor is electrically connected with the current input end of the second current conductor, and is used for commonly introducing the large current; the current output end of the first current conductor is electrically connected with the current output end of the second current conductor and is used for jointly outputting the large current; the Hall IC is used for detecting the large current;
when detecting small currents, the first current conductor and the second current conductor are electrically isolated, and the first current conductor and the second current conductor respectively transmit different currents; the hall IC is configured to detect the different currents.
10. The method of detecting a current according to claim 9, wherein the current input terminal of the first current conductor and the current input terminal of the second current conductor are electrically connected by welding when a large current is detected,
and the current output end of the first current conductor is electrically connected with the current output end of the second current conductor in a welding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311576228.0A CN117289012B (en) | 2023-11-24 | 2023-11-24 | Dual-current input/output, dual-isolation current sensor and current detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311576228.0A CN117289012B (en) | 2023-11-24 | 2023-11-24 | Dual-current input/output, dual-isolation current sensor and current detection method |
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| CN117289012A true CN117289012A (en) | 2023-12-26 |
| CN117289012B CN117289012B (en) | 2024-02-13 |
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