High-frequency multi-Hall open-loop sensor
By adopting a high-frequency multi-hall open-loop sensor design in the Hall current sensor, including Hall element array and amorphous magnetic core, the problem of large accuracy errors at large currents is solved, and the anti-interference performance is improved, meeting the high-precision detection requirements.
Patent Information
- Application Number
- CN202420724197.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-04-09
AI Technical Summary
When the existing open-loop Hall current sensor detects large current, the current is not in the center, resulting in large accuracy errors, and poor anti-interference performance. The accuracy can only reach ±1%, which cannot meet the high-precision requirements.
Using a high-frequency do Hall open-loop sensor, four symmetrical air gaps are designed by bonding potting glue on the PCBA, installing Hall element arrays and amorphous magnetic cores, and a square detachable overflow hole structure is adopted.
It improves detection accuracy and anti-interference performance, enhances the frequency response dynamic range, meets the high-precision detection requirements, and is convenient for installation and disassembly.
Smart Images
Figure CN222800820U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current sensors, in particular to a high-frequency multi-Hall open-loop sensor. Background Art
[0002] A current sensor is a detection device that can sense the information of the measured current and convert the sensed information into an electrical signal or other required form of information output that meets certain standards according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording and control. Current sensors, also known as magnetic sensors, are widely used in household appliances, smart grids, electric vehicles, wind power generation, etc.
[0003] Existing Hall current sensors are of two types: open-loop and closed-loop. Open-loop Hall current sensors have simple processes, low costs, diverse installation methods, large measured currents, and are easy to produce and apply.
[0004] The large current and large structure type is generally a double air gap or multi-air gap structure. The product of the large current and large structure type has a square or other special-shaped structure of the current hole. When the through-core current cable is not in the center of the current hole, it has a great impact, causing the accuracy error of the sensor to detect the current to exceed the accuracy requirement range. And because the product is a multi-air gap design, the core air gap needs to be made larger when detecting large currents, and the anti-interference performance to the external magnetic field is very poor.
[0005] In addition, the open-loop principle Hall current sensor has a wide measurement range, but the accuracy can only be within ±1%, which cannot meet customer requirements in some situations where high precision is required. Utility Model Content
[0006] (1) Technical issues to be solved
[0007] The utility model provides a high-frequency multi-Hall open-loop sensor, which overcomes the problems that the large current and large structure air gap structure of the open-loop sensor has a great influence when the current is not in the center of the current hole, thus resulting in a large detection accuracy error; and the air gap of the magnetic core needs to be made large when the current is large, and the anti-interference performance to the peripheral magnetic field is very poor; and the Hall current sensor based on the open-loop principle has a wide measurement range, but the accuracy can only be achieved within ±1%, which cannot meet the accuracy requirements of customers.
[0008] (2) Technical solution
[0009] In order to solve the above technical problems, the utility model provides a high-frequency multi-Hall open-loop sensor, including potting glue, PCBA, Hall element, and magnetic core;
[0010] The potting glue is bonded around the front of the PCBA; electronic components are mounted on the front of the PCBA; the Hall element is arranged on the back of the PCBA; the magnetic core with four sections is mounted on the edge of the back of the PCBA; and the magnetic core is snapped into the shell.
[0011] Preferably, the magnetic core uses an amorphous magnetic core material.
[0012] Preferably, four symmetrical air gaps are provided on the magnetic core; the air gaps include a first air gap, a second air gap, a third air gap, and a fourth air gap; the first air gap and the second air gap are symmetrically arranged at the left and right ends of the magnetic core; the third air gap and the fourth air gap are symmetrically arranged at the lower end of the magnetic core.
[0013] Preferably, the Hall elements on the PCBA are arranged in a multi-Hall element array.
[0014] Preferably, the outer shell comprises an upper shell and a lower shell; the upper shell is provided with mounting surfaces on the left and right sides, and the mounting surfaces are provided with screw holes; screws are connected to the inner threads of the screw holes; the upper shell and the lower shell are fixedly connected together by the screws.
[0015] (3) Beneficial effects
[0016] The utility model provides a high-frequency multi-Hall open-loop sensor, which overcomes the problems that the large current and large structure air gap structure of the open-loop sensor has a great influence when the current is not in the center of the current hole, thus resulting in a large detection accuracy error; and the air gap of the magnetic core needs to be made large when the current is large, and the anti-interference performance to the peripheral magnetic field is very poor; and the Hall current sensor based on the open-loop principle has a wide measurement range, but the accuracy can only be achieved within ±1%, which cannot meet the accuracy requirements of customers.
[0017] 1. The use of Hall element array ensures that when the current cable is not in the center of the current hole, the detection accuracy of the product will not change too much, thereby improving the product detection performance and the dynamic range of the frequency response.
[0018] 2. The flow hole is a square detachable structure, which is easy to install and disassemble.
[0019] 3. By distributing the total air gap into four equal parts, the deviation of the air gap size is relatively small, which greatly improves the anti-interference performance against external interference magnetic fields.
[0020] 4. Using amorphous magnetic material cores can also obtain smaller eddy current losses and excellent magnetic properties in the high frequency range. Its magnetic field has the advantages of high sensitivity, wide frequency response dynamic range, and good stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1A high-frequency multi-Hall open-loop sensor proposed by the utility model;
[0022] Figure 2 For the utility model Figure 1 ;
[0023] Figure 3 It is a structural schematic diagram of the air gap distribution in the utility model;
[0024] Figure numerals: 1-potting glue, 2-PCBA, 3-Hall element array, 4-amorphous magnetic core (Hall chip), 41-air gap, 411-first air gap, 412-second air gap, 413-third air gap, 414-fourth air gap, 5-screw, 6-upper shell, 7-lower shell. DETAILED DESCRIPTION
[0025] The utility model is further described in conjunction with the accompanying drawings and embodiments.
[0026] like Figures 1 to 3 As shown, a high-frequency multi-Hall open-loop sensor described in the utility model includes a potting glue 1, a PCBA 2, a Hall element 3, and a magnetic core 4;
[0027] The potting glue 1 is bonded around the front of the PCBA2; electronic components are mounted on the front of the PCBA2; the Hall element 3 is provided on the back of the PCBA2; the magnetic core 4 with four sections is mounted on the edge of the back of the PCBA2; the magnetic core 4 is snapped into the shell.
[0028] The magnetic core 4 is made of amorphous magnetic material, which can obtain smaller eddy current loss and excellent magnetic properties in the high frequency range, and its magnetic field has the advantages of high sensitivity, wide frequency response dynamic range, good stability, etc.
[0029] The magnetic core 4 is provided with four symmetrical air gaps 41; the air gaps 41 include a first air gap 411, a second air gap 412, a third air gap 413, and a fourth air gap 414; the first air gap 411 and the second air gap 412 are symmetrically arranged at the left and right ends of the magnetic core 4; the third air gap 413 and the fourth air gap 414 are symmetrically arranged at the lower end of the magnetic core 4. By evenly distributing the total air gaps 41 into four, the size deviation of the air gaps 41 is relatively small, and the anti-interference performance to the external interference magnetic field is greatly improved.
[0030] The arrangement of the Hall element 3 on the PCBA 2 adopts a multi-Hall element array. The Hall element array ensures that when the overcurrent cable is not at the center of the overcurrent hole, the detection accuracy of the product will not change too much, thereby improving the product detection performance and the frequency response dynamic range.
[0031] The housing includes an upper shell 6 and a lower shell 7; the upper shell 6 is provided with mounting surfaces on both sides, and the mounting surfaces are provided with screw holes; screws 5 are threadedly connected in the screw holes; the upper shell 6 and the lower shell 7 are fixedly connected together by the screws 5. The flow hole is a square detachable structure, which is convenient for installation and removal.
[0032] Working principle: When the overcurrent cable passes through the overcurrent hole of the plastic shell, current flows through the overcurrent cable, generating a magnetic field consistent with the magnitude and direction of the current. The magnetic core collects the magnetic field signal and generates a corresponding magnetic flux in the air gap of the magnetic core. The Hall element detects the magnetic flux in the air gap of the magnetic core and converts it into a differential signal to the back-end circuit for amplification, outputting a signal that is linearly related to the sum of the magnetic flux in the four air gaps of the magnetic core. The client collects this signal and can monitor the changes in the primary current in real time. When the overcurrent cable is not in the center of the overcurrent hole, the detection accuracy of the product will not change too much. At the same time, since the total air gap is evenly distributed to four, the deviation of the air gap size is relatively small, and the anti-interference performance to the external interference magnetic field is greatly improved. The content not described in detail in this specification belongs to the prior art known to professionals in this field.
[0033] The above-mentioned embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but the utility model is not limited to these embodiments. It should be pointed out that for ordinary technicians in this field. Under the premise of not departing from the purpose of the utility model, any improvement made shall fall within the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A high frequency multi-Hall open loop sensor, characterized in that: It includes a potting compound (1), a PCBA (2), a Hall element (3), and a magnetic core (4); The potting glue (1) is bonded around the front of the PCBA (2); electronic components are mounted on the front of the PCBA (2); the Hall element (3) is arranged on the back of the PCBA (2); the magnetic core (4) with a four-section design is mounted on the edge of the back of the PCBA (2); and the magnetic core (4) is snapped into the housing.
2. A high frequency multi-Hall open loop sensor according to claim 1, characterized in that: The magnetic core (4) uses an amorphous magnetic material core.
3. A high frequency multi-Hall open loop sensor according to claim 1, characterized in that: The magnetic core (4) is provided with four symmetrical air gaps (41); the air gaps (41) include a first air gap (411), a second air gap (412), a third air gap (413), and a fourth air gap (414); the first air gap (411) and the second air gap (412) are symmetrically arranged at the left and right ends of the magnetic core (4); and the third air gap (413) and the fourth air gap (414) are symmetrically arranged at the lower end of the magnetic core (4).
4. A high frequency multi-Hall open loop sensor according to claim 1, characterized in that: The Hall elements (3) on the PCBA (2) are arranged in a multi-Hall element array manner.
5. A high frequency multi-Hall open loop sensor according to claim 1, characterized in that: The outer shell comprises an upper shell (6) and a lower shell (7); the upper shell (6) is provided with mounting surfaces on both sides thereof, and screw holes are provided on the mounting surfaces; screws (5) are threadedly connected in the screw holes; the upper shell (6) and the lower shell (7) are fixedly connected together by the screws (5).