Double-Hall closed-loop current sensor
By designing a dual Hall closed-loop structure in the Hall current sensor, using the matching of the multi-stage magnetic core group and Hall sensing elements, the problem of reduced accuracy during large current detection is solved, and higher detection accuracy and reduced production are achieved. and installation costs.
Patent Information
- Application Number
- CN202420721393.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-04-09
AI Technical Summary
The accuracy of existing Hall current sensors is easily reduced when the detection of large currents is detected, especially the detection accuracy of closed-loop single Hall current sensors is reduced when the overcurrent aperture increases, and the production and installation costs are relatively high.
A dual Hall closed-loop current sensor is designed to form a uniform size and symmetrical air gap on the PCBA circuit board by setting up multiple removable core groups inside the plastic shell, and matches the Hall sensing elements on the PCBA circuit board to form a Double Hall closed-loop setting.
No matter where the overcurrent bus is, the dual Hall sensor can compensate and collect through the corresponding Hall sensing elements, ignoring the accuracy impact caused by the changes in the bus, thus greatly improving the sensor's detection accuracy.
Smart Images
Figure CN222461545U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field related to current sensors, in particular to a dual-Hall closed-loop current sensor. Background Art
[0002] The existing Hall current sensors are open-loop and closed-loop. The open-loop Hall current sensor has simple process, low cost, diversified installation methods, large measured current, and is easy to produce and apply, but the accuracy can only be ±1%; the closed-loop Hall current sensor has high accuracy and small temperature drift, but the existing closed-loop Hall current sensors are all single Hall mode, which has no effect on accuracy when the flow aperture is small. When the measured current increases and the flow aperture also increases synchronously, the flow busbar is not centered, and the detection accuracy will decrease. It is necessary to make a special positioning ring to place the busbar in the middle of the flow hole, which is relatively troublesome and will increase the corresponding production and installation costs. To this end, we design a new type of dual Hall closed-loop current sensor to overcome the above problems. Utility Model Content
[0003] 1. Technical issues to be resolved
[0004] The utility model aims to provide a dual Hall closed-loop current sensor to solve the problem that the open-loop Hall current sensor in the prior art has low precision and the closed-loop single Hall current sensor is prone to reduced precision when detecting large currents. (II) Utility Model Content
[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a dual Hall closed-loop current sensor, comprising a plastic shell arranged at the bottom, the plastic shell being provided with a flow hole, the top surface of the plastic shell being an open structure, and the bottom surface being a closed structure, the interior of the plastic shell being a hollow structure, the interior of the plastic shell being provided with a magnetic core group, the magnetic core group being arranged in a hollow position inside the plastic shell, the magnetic core group being composed of a plurality of sections of detachable magnetic cores and forming an air gap, the outer portion of the magnetic core being sleeved with a plurality of turns of feedback coils, the magnetic core group being arranged above a PCBA circuit board, a Hall sensor element being electrically connected to a position of the PCBA circuit board opposite to the air gap, other electronic components electrically connected thereto being further arranged on the PCBA circuit board, the top surface of the plastic shell being sealed by a potting compound matching the shape of its opening, and finally forming a sealed whole; it should be noted that other electronic components refer to necessary electronic components that can achieve the effect of improving the precision.
[0007] Preferably, the plastic shell is in the shape of a cuboid, with a cuboid hollow groove in the middle for placing objects.
[0008] Preferably, the magnetic core group is composed of four magnetic cores of the same size, and the four magnetic cores form two air gaps that are symmetrically arranged on the left and right.
[0009] Preferably, two Hall sensor elements are provided and are symmetrically arranged.
[0010] Preferably, the multi-turn feedback coils are provided in four numbers and matched with the four sections of the magnetic core.
[0011] (III) Beneficial effects
[0012] The utility model forms a dual Hall closed-loop setting by configuring the magnetic core group to be a multi-section detachable magnetic core, and forming a uniformly sized, bilaterally symmetrical air gap through the multi-section detachable magnetic core, so as to match the Hall sensing element on the PCBA circuit board. No matter where the primary busbar in the overcurrent hole is located, there is a corresponding Hall sensing element for compensation collection, and the accuracy influence caused by the change of the busbar can be ignored, thereby greatly improving the detection accuracy of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0014] Figure 1 It is a schematic diagram of the explosion structure of the utility model.
[0015] Figure 2 It is a bottom view of the utility model.
[0016] Explanation of reference numerals: 1- potting glue, 2- plastic shell, 3- multi-turn feedback coil, 4- magnetic core group, 5- PCBA circuit board, 6- Hall sensor element. DETAILED DESCRIPTION
[0017] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0019] See also Figure 1 The utility model provides an embodiment: a dual Hall closed-loop current sensor, including a plastic shell 2 arranged at the bottom, a flow hole is arranged on the plastic shell 2, the top surface of the plastic shell 2 is an open structure, and the bottom surface is a closed structure. The interior of the plastic shell 2 is a hollow structure, and magnetic core groups 4 are respectively arranged inside the plastic shell 2. The magnetic core groups 4 are placed in the hollow position inside the plastic shell 2. The magnetic core groups 4 are composed of a plurality of detachable magnetic cores and form an air gap. The outer sleeve of the magnetic core group 4 is provided with a plurality of turns of feedback coil 3. The magnetic core group 4 is arranged above the PCBA circuit board 5. The position of the PCBA circuit board 5 opposite to the air gap is electrically connected to a Hall sensor element 6. The PCBA circuit board 5 is also provided with electronic components electrically connected thereto. The top surface of the plastic shell 2 is sealed by a potting glue 1 matched thereto. Among them, the plastic shell 2 is arranged as a rectangular parallelepiped, and a rectangular hollow groove for placing objects is opened in the middle. See the attached for details. Figure 1 The magnetic core group 4 is composed of four magnetic cores of the same size, and the multi-turn feedback coil 3 is provided with four and matched with the four magnetic cores; the four magnetic cores form two air gaps symmetrically arranged on the left and right, and the matching Hall sensor elements 6 are also provided with two and symmetrically arranged.
[0020] The plastic shell of the utility model is a square structure, and the magnetic core is a multi-segment design (which becomes a magnetic core group after being combined). During the use of the utility model, two identical-sized air gaps are formed by setting the multi-segment magnetic core, forming two symmetrical air gaps. Electronic components and two symmetrical Hall sensor elements corresponding to the air gaps are mounted on the PCBA circuit board; the overcurrent cable passes through the overcurrent hole on the plastic shell. When current flows through the overcurrent cable, a magnetic field consistent with the current size and direction is generated. The magnetic core collects the magnetic field signal and generates a corresponding magnetic flux in the air gap. The Hall sensor element detects the magnetic flux in the air gap and then converts it into a magnetic field. The differential signal is converted to a differential signal and given to the back-end circuit. The power triode of the back-end circuit outputs a driving current of the same proportion. The current flows through the multi-turn feedback coil. The current direction is opposite to the primary current direction and the magnitude is the same. When the primary current changes, the output current also changes accordingly. The client collects the signal size and direction of the current to monitor the size and direction of the primary current. Since the Hall is a dual Hall setting, no matter where the primary busbar position in the overcurrent hole is, there is a corresponding Hall for compensation collection, and the accuracy impact caused by the change of the busbar can be ignored, thereby improving the detection accuracy of the sensor.
[0021] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.
[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A dual Hall closed-loop current sensor, comprising a plastic housing (2) arranged at the bottom, characterized in that: The plastic shell (2) is provided with a flow hole, the top surface of the plastic shell (2) is an open structure, and the bottom surface is a closed structure, the interior of the plastic shell (2) is a hollow structure, a magnetic core group (4) is provided in the hollow position inside the plastic shell (2), the magnetic core group (4) is composed of a plurality of detachable magnetic cores and forms an air gap, a plurality of turns of feedback coils (3) are sleeved on the outside of the magnetic core, the magnetic core group (4) is arranged above a PCBA circuit board (5), a Hall sensor element (6) is electrically connected to the position of the PCBA circuit board (5) opposite to the air gap, and other electronic components electrically connected thereto are also provided on the PCBA circuit board (5), and the top surface of the plastic shell (2) is sealed by a potting glue (1) matching the shape of its opening.
2. A dual Hall closed-loop current sensor according to claim 1, characterized in that: The plastic shell (2) is in the shape of a rectangular parallelepiped, with a rectangular hollow groove in the middle for placing objects.
3. A dual Hall closed-loop current sensor according to claim 1, characterized in that: The magnetic core group (4) is composed of four sections of magnetic cores of the same size, and the four sections of the magnetic cores form two air gaps that are symmetrically arranged on the left and right.
4. A dual Hall closed-loop current sensor according to claim 3, characterized in that: The Hall sensor elements (6) are provided with two and are symmetrically arranged.
5. A dual Hall closed-loop current sensor according to claim 3 or 4, characterized in that: The multi-turn feedback coils (3) are provided in four pieces and matched with the four sections of the magnetic core.