CN219434940U

CN219434940U - Iron-core-free Hall type current sensor

Info

Publication number: CN219434940U
Application number: CN202320347702.1U
Authority: CN
Inventors: 林生军; 黄健
Original assignee: Yuxin Technology Shanghai Co ltd
Current assignee: Yuxin Technology Shanghai Co ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2023-07-28
Anticipated expiration: 2033-02-28

Abstract

The application discloses a coreless Hall type current sensor, which belongs to the technical field of current sensor equipment and comprises a shell, a PCB (printed circuit board) integrated with a Hall chip and a positioning structure, wherein the shell is provided with a first end and a second end which are opposite in the height direction, the second end of the shell is provided with a protruding structure which is suitable for being inserted into an induction groove of a copper bar, and the first end of the shell is provided with a plurality of external terminals; the PCB is positioned in the convex structure, wherein a differential output amplifier is arranged in the Hall chip, and the PCB is electrically connected with the external terminal; the positioning structure is arranged on the surface of the shell and is used for installing or limiting the current sensor on the output element. The coreless Hall type current sensor solves the problems of zero current precision and linearity caused by hysteresis problems and magnetic saturation problems of the traditional coreless current sensor, has higher measurement precision, and has a more compact overall structure.

Description

Iron-core-free Hall type current sensor

Technical Field

The utility model relates to the technical field of sensor equipment, in particular to a coreless Hall type current sensor.

Background

The current sensor is used for detecting current and is mainly used in the fields of household appliances, smart grids, wind power generation, new energy automobile IGBT and the like. At present, the most widely used hall current sensor has the basic principle that when current passes through a conductor, a magnetic field is generated around the conductor, the magnetic field passes through a hall device to generate hall potential, and the magnitude of current carrying conductor current is indirectly measured by measuring the magnitude of the hall potential.

In the prior art, all Hall type current sensors for the IGBT of the new energy automobile are provided with an iron core. The principle of the method is as follows: and (3) current is conducted in one wire, so that a magnetic field which is in direct proportion to the current of the wire is generated around the wire, the magnetic field is gathered on the Hall device through the magnetic core, then the voltage signal which is induced and generated by the Hall element is measured by utilizing the characteristics of the Hall element, and finally the Hall voltage is amplified by an amplifier and then a Hall voltage which can be directly measured is output.

However, due to the existence of the iron core, the product must have a larger volume, has certain requirements on the installation space and has larger limitation; in addition, the iron core itself has hysteresis characteristics, which causes a change in zero current output and eventually a measurement error when a large magnetic field is applied to the magnetic core, and the iron core has poor interference resistance, and also interferes with the current sensor when another magnetic field exists around, further increasing the measurement error.

Disclosure of Invention

The utility model has the advantages that the iron core-free Hall type current sensor is provided, wherein a PCB integrated with a Hall chip on the current sensor is placed or installed in an induction groove of a copper bar through a bulge structure, the current passes through the copper bar to generate magnetic fields, the Hall chip can detect the magnetic fields in different directions, and further, the current sensor is driven to carry out analog output through a differential output amplifier in the Hall chip, so that the current measurement is realized, the problems of zero current precision and linearity caused by hysteresis and magnetic saturation of the traditional iron core-containing current sensor can be effectively solved, the measurement precision is effectively improved, meanwhile, the overall structure of the current sensor is more compact, the requirement on installation space is small, and the application range is wider.

To achieve at least one of the above advantages, the present utility model provides a coreless hall current sensor, comprising:

the shell is provided with a first end and a second end which are opposite in the height direction, wherein the second end of the shell is provided with a protruding structure which is suitable for being inserted into an induction groove of a copper bar, and the first end of the shell is provided with a plurality of external terminals;

the PCB is positioned in the convex structure, a differential output amplifier is arranged in the Hall chip, and the PCB is electrically connected with the external terminal; and

and the positioning structure is arranged on the surface of the shell and is used for mounting or limiting the current sensor on the output element.

According to an embodiment of the utility model, the housing comprises an upper housing and a lower housing that are connected in a fitting manner, wherein the second end is located at a bottom of the lower housing remote from the upper housing, wherein the first end is located at a top of the upper housing remote from the lower housing.

According to an embodiment of the present utility model, the PCB board is disposed in the protruding structure in a manner perpendicular to a bottom of the sensing groove.

According to an embodiment of the utility model, the PCB board is arranged in the protruding structure in parallel to the bottom of the induction groove.

According to an embodiment of the present utility model, the external terminals are implemented in six rows, and the six external terminals are symmetrically distributed in two rows along the length direction of the housing.

According to an embodiment of the present utility model, the positioning structure includes two positioning columns symmetrically disposed at the first end, and the two positioning columns are located outside the external connection terminal.

These and other objects, features and advantages of the present utility model will become more fully apparent from the following detailed description.

Drawings

Fig. 1 is a schematic perspective view of a coreless hall current sensor according to a preferred embodiment of the present application.

Fig. 2 is a schematic diagram showing a cross-sectional structure of a coreless hall current sensor according to a preferred embodiment of the present application.

Fig. 3 shows a schematic top view of the coreless hall current sensor of the present application after being mounted on a copper bar.

Fig. 4 shows a schematic cross-sectional view of the structure of fig. 3 A-A of the present application.

Detailed Description

The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

It will be appreciated by those skilled in the art that in the disclosure of the present specification, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, the above terms should not be construed as limiting the present utility model.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

Referring to fig. 1 to 4, a coreless hall type current sensor according to a preferred embodiment of the present utility model will be described in detail below, wherein the coreless hall type current sensor includes a housing 10, a PCB board 20 integrated with a hall chip 21, and a positioning structure 30, wherein the positioning structure 30 is provided on a surface of the housing 10 for mounting or limiting the current sensor on an output element or a client, wherein the housing 10 has a first end 111 and a second end 112 opposite to each other in a height direction, wherein the housing 10 is provided with a protrusion structure 113 adapted to be inserted into an induction slot of a copper bar 90 at the second end 112, and the housing 10 is provided with a plurality of external terminals 114 at the first end 111, and further, the PCB board 20 integrated with the hall chip 21 is located within the protrusion structure 113, and a differential output amplifier is provided within the hall chip 21, and the PCB board 20 is electrically connected with the external terminals 114.

Normally, the IGBT will open a hole in the copper bar 90, while a slot is reserved in the housing, and when the coreless hall current sensor is fixed or mounted in the reserved slot by the bump structure 113, i.e. the bump structure 113 of the coreless hall current sensor is inserted into the sensing slot of the copper bar 90, a magnetic field will be generated when current passes through the copper bar 90; on the other hand, the client supplies power to the hall chip 21 through one of the external terminals 114, so that the hall chip 21 works, then the differential output amplifier on the hall chip 21 outputs signals by sensing the magnetic field change around the copper bar 90, and then outputs signals to the client through the other external terminals 114, so that the current measurement is realized.

Therefore, the iron-core-free Hall type current sensor provided by the application can overcome the problems of zero current precision and linearity of the traditional iron-core-free Hall type current sensor caused by hysteresis problems and magnetic saturation problems, so that the measurement precision of current is effectively improved, meanwhile, the overall structure of the current sensor is more compact, the requirement on the installation space is smaller, and the application range of the iron-core-free Hall type current sensor is wider.

In one embodiment, the housing 10 includes an upper housing 11 and a lower housing 12 that are assembled, wherein the second end 112 is located at a bottom of the lower housing 12 away from the upper housing 11, and wherein the first end 111 is located at a top of the upper housing 11 away from the lower housing 12, thereby enabling easy installation and removal of various components including the PCB board 20 inside the housing 10.

As a preferred embodiment, the PCB 20 is disposed in the protruding structure 113 in a manner perpendicular to the bottom of the sensing groove.

As another preferred embodiment, the PCB 20 is disposed in the protrusion 113 in parallel to the bottom of the sensing groove.

Further preferably, the external terminals 114 are implemented in six, and the six external terminals 114 are symmetrically distributed in two rows along the length direction of the housing 10.

Further preferably, the positioning structure 30 includes two positioning posts symmetrically disposed at the first end 111, and at the same time, the two positioning posts are located at the outer sides of the external connection terminal 114, so as to mount or limit the coreless hall current sensor on an output element or a client.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The advantages of the present utility model have been fully and effectively realized. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.

Claims

1. Iron core-free hall type current sensor, its characterized in that includes:

2. The coreless hall current sensor of claim 1, wherein the housing comprises an upper housing and a lower housing that are assembled, wherein the second end is located at a bottom of the lower housing that is remote from the upper housing, and wherein the first end is located at a top of the upper housing that is remote from the lower housing.

3. The coreless hall current sensor of claim 2, wherein the PCB is disposed within the raised structure perpendicular to a bottom of the sensing groove.

4. The coreless hall current sensor of claim 2, wherein the PCB is disposed within the raised structure in parallel with a bottom of the sensing groove.

5. The coreless hall current sensor of claim 3 or 4, wherein six of the external terminals are implemented, and the six external terminals are symmetrically distributed in two rows along the length direction of the housing.

6. The coreless hall current sensor of claim 5, wherein said positioning structure comprises two positioning posts symmetrically disposed at said first end, said two positioning posts being located outside said external terminal.