Current detection device

Abstract

The utility model discloses a current detection device, which comprises a current-carrying busbar and a PCB (printed circuit board), the current-carrying busbar is connected with a sampling object in series, an external power supply is introduced into the PCB to supply power to a Hall sensor and output current signals, the current-carrying busbar is provided with an open slot matched with the PCB, the PCB is erected at the opening of the open slot, and the PCB is connected with the sampling object. The current direction of the Hall sensor is consistent with that of the current-carrying busbar; according to the utility model, the PCB is erected above the slot of the current-carrying busbar, so that good electrical connection between the PCB and the current-carrying busbar can be ensured, a stable path is provided for current transmission, and the problems of a serial Hall sensor in the aspects of cost, structural installation and safety distance are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of current detection, in particular to a current detection device. Background Art

[0002] Current sensing is a crucial technology in numerous fields, including industry and automotive. For example, in industrial production, current monitoring of equipment such as large motors and welding machines helps understand the equipment's operating status, promptly identify potential faults, and ensure production safety and efficiency. In the automotive sector, accurate measurement of battery charge and discharge currents and motor drive currents is crucial for vehicle performance evaluation, range prediction, and fault diagnosis.

[0003] Currently, common current detection methods on the market include current transformers and Hall sensors. Current transformers, based on the principle of electromagnetic induction, detect current by measuring the proportional relationship between the primary and secondary currents. Hall sensors, on the other hand, utilize the Hall effect. When current flows through a current-carrying conductor, a Hall potential is generated in a direction perpendicular to the current and magnetic field. This potential is then measured to determine the current magnitude. Among these detection technologies, string-wire Hall sensors are widely used, but they present several challenges. First, their cost is relatively high, typically between 120 and 130 yuan for a typical ±150A measurement range. This is a significant disadvantage in large-scale applications or cost-sensitive projects. Second, string-wire Hall sensors are complex to install and require strict adherence to specific installation requirements, otherwise measurement accuracy will be compromised. Furthermore, they are subject to limitations such as safety distances, further complicating and limiting their application. Utility Model Content

[0004] The purpose of the utility model is to provide a current detection device. By mounting a PCB above the slot of a current-carrying busbar, a good electrical connection between the PCB and the current-carrying busbar is ensured, while providing a stable path for current transmission. This solves the problems of series-wire Hall sensors in terms of cost, structural installation, and safety distance.

[0005] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0006] A current detection device, comprising:

[0007] a current-carrying busbar, the current-carrying busbar being connected in series with the sampling object;

[0008] PCB board, which introduces an external power supply to power the Hall sensor and outputs a current signal;

[0009] The current-carrying busbar is provided with a slot matching the PCB board, the PCB board is mounted at the opening of the slot, and the current direction of the Hall sensor is consistent with the current direction of the current-carrying busbar.

[0010] As a further technical solution of the current detection device, the distance between the bottom surface of the PCB board and the bottom wall surface of the slot does not exceed 1 mm. This close spacing design helps to reduce electromagnetic interference and improve detection accuracy.

[0011] As a further technical solution of the current detection device, a screw hole area is provided at each of the left and right ends of the current-carrying busbar, and the screw hole area is provided with a penetrating screw hole, and the screw hole is provided with a bolt. The current-carrying busbar is crimped in series with the sampling object through the bolts. This solution provides screw holes at both ends of the current-carrying busbar. When it is necessary to measure the current of the sampling object, the bolt is passed through the screw hole and pressed against the sampling object to achieve effective contact. Since the sampling object is pressed with bolts at both ends of the current-carrying busbar, it is equivalent to connecting the entire current detection device in series with the sampling object.

[0012] As a further technical solution for the current detection device, a welding area is provided at each left and right end of the slotted opening, and a welding copper area matching the welding area is provided at each left and right end of the bottom surface of the PCB board. The PCB board is electrically connected to the current-carrying busbar via the welding copper area. In order to achieve a good electrical connection with the PCB board, when the PCB board is installed on the current-carrying busbar, the welding copper area can ensure that the current can be smoothly transmitted from the current-carrying busbar to the PCB board, thereby realizing the normal operation of the entire detection device.

[0013] As a further technical solution of the current detection device, the welding area is copper-clad. This copper-clad design can also help to dissipate heat and enhance the mechanical strength of the connection between the current-carrying busbar and the PCB board to a certain extent.

[0014] As a further technical solution of the current detection device, the maximum current carrying capacity of the PCB board is not less than 1 / 10A of the current to be measured, which can ensure that the PCB board can accurately obtain the current signal when detecting large currents and will not be damaged by excessive currents.

[0015] As a further technical solution for the current detection device, all components on the PCB are surface-mount components. Due to the limited space and compact design of the PCB, in order to achieve better performance and smaller size, the use of surface-mount components can enable the PCB to achieve higher integration and more components can be installed in a smaller space.

[0016] As a further technical solution for the current detection device, good conductivity ensures smooth current flow through the busbar, reducing energy loss during transmission. This is crucial for current detection devices, as lower resistance avoids energy waste and temperature rise caused by resistive heating, thereby improving detection accuracy and stability. Therefore, the current-carrying busbar is made of a material with good conductivity and mechanical strength.

[0017] As a further technical solution of the current detection device, the current-carrying busbar is a component made of any one of aluminum alloy, copper alloy and silver alloy.

[0018] As a further technical solution of the current detection device, in order to further reduce the cost of the device, the current signal can be a single-ended or differential signal.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] 1. This utility model utilizes a unique current-carrying busbar and PCB design, eliminating the need for expensive string-type Hall effect sensors and significantly reducing the manufacturing cost of the detection device. Compared to traditional string-type Hall effect sensors, while meeting the same measurement requirements, the cost of the detection device of this utility model is significantly lower. This enables wider application of current detection technology in cost-sensitive sectors such as industry and automotive, improving market competitiveness and reducing production costs for enterprises.

[0021] 2. This utility model overcomes the complex installation issues associated with inline Hall effect sensors. Due to the simple and clear design of the busbar and PCB, and the fact that the Hall effect elements are all surface mount components, operators can more easily install and debug the detection device. This design also reduces the potential for errors and failures caused by complex installation, improving operational convenience and reliability. Furthermore, the tight spacing between the PCB and the busbar helps reduce electromagnetic interference, further improving measurement accuracy.

[0022] 3. The present invention is more flexible in terms of spatial layout and can be more tightly integrated into related equipment without being affected by electrical safety issues. This makes it possible to use the current detection device in application scenarios with limited space, broadening the application range of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0025] Figure 2 This is a schematic diagram of the top structure of the utility model;

[0026] Figure 3 This is a circuit diagram of the utility model.

[0027] Markings and corresponding parts names in the accompanying drawings:

[0028] 1- screw hole area, 2- screw hole, 3- current-carrying busbar, 4- PCB board, 5- slot, 6- welding area. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0030] Example 1

[0031] This embodiment 1 provides a current detection device, such as Figure 1-Figure 2 As shown, it includes a current-carrying busbar 3 and a PCB board 4;

[0032] Among them, see Figure 1 and Figure 2 As shown, the overall size of the current-carrying busbar 3 is designed to be 100×40×10mm. This size design takes into account both the ability to carry a sufficiently large current and the compactness of the overall device. A slot 5 is opened in the middle of the current-carrying busbar 3. The size of the slot 5 is 30×40mm. In order to reduce electromagnetic interference and improve the accuracy of detection, the depth of the slot 5 does not exceed 1mm. By reducing the distance between the bottom surface of the PCB board and the bottom wall of the slot 5, the purpose of reducing electromagnetic interference is achieved.

[0033] At the same time, if Figure 2 As shown, welding areas 6 are provided on both sides of the top of the slot 5, and the size of the welding area 6 is 10×40 mm. A welding copper area matching the welding area 6 is provided at the left and right ends of the bottom surface of the PCB board 4. The PCB board 4 is electrically connected to the current-carrying busbar 3 through the welding copper area, ensuring that the current can be smoothly transmitted from the current-carrying busbar 3 to the PCB board 4, thereby realizing the normal operation of the entire detection device.

[0034] In some embodiments, the above-mentioned welding area 6 is copper-clad. This copper-clad design can, to a certain extent, help dissipate heat and enhance the mechanical strength of the connection between the current-carrying busbar 3 and the PCB board 4. In order to avoid damage to the PCB board 4 due to excessive current, the maximum current carrying capacity of the PCB board is not less than 1 / 10A of the current to be measured, and the current direction at the device measurement position is consistent with the current direction of the current-carrying busbar.

[0035] Please refer to Figure 1 and Figure 2 As shown, the PCB board 4 is used to introduce an external power supply to power the Hall sensor and output the current signal. Specifically, the overall size of the above-mentioned PCB board 4 is 50×40mm, and the 10×40mm area on each side is the welding copper area (located on the bottom layer of the PCB board), and the middle 30×40mm area is the component layout part (located on the top layer of the PCB board 4). This area is used to place various components. In order to enable the PCB board 4 to achieve a higher degree of integration, all components are surface-mount components. This design is also conducive to improving reliability.

[0036] Example 2

[0037] This embodiment 2 provides a current detection device based on embodiment 1, such as Figure 1-Figure 3 As shown, it includes a current-carrying busbar 3 and a PCB board 4. A screw hole area 1 is provided at each end of the current-carrying busbar 3. The screw hole area 1 is provided with a through screw hole 2. Bolts are provided on the screw holes 2. The current-carrying busbar 3 is crimped in series with the sampling object through the bolts. When the current of the sampling object needs to be measured, the bolt is passed through the screw hole 2 and pressed against the sampling object to achieve effective contact.

[0038] At the same time, in order to improve the accuracy and stability of detection, the above-mentioned current-carrying busbar 3 is made of a material with good conductivity and mechanical strength, such as any one of aluminum alloy, copper alloy and silver alloy. Considering the comprehensive cost and performance, this embodiment adopts a combination of a PCB board 4 and an aluminum alloy current-carrying busbar 3.

[0039] Working principle of a current detection device:

[0040] like Figure 3 As shown, when the current detection device described in Examples 1 and 2 is testing DC current, IP+ is the current input terminal, IP- is the current output terminal, and signal I_OUT is the output signal, which can be single-ended or differential. When testing AC current, the output signal can only be differential. When current passes through the current-carrying busbar 3, it generates a magnetic field in the surrounding area. The Hall element generates a corresponding electrical signal based on the changes in the magnetic field. This electrical signal is processed by the circuit on the PCB board 4 and output through IP- and I_OUT, thereby realizing the detection of large currents.

[0041] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A current detection device, characterized in that: include: A current-carrying busbar (3), the current-carrying busbar (3) being connected in series with the sampling object; A PCB board (4), wherein the PCB board (4) introduces an external power supply to power the Hall sensor and outputs a current signal; The current-carrying busbar (3) is provided with a slot (5) matching the PCB board (4), the PCB board (4) is mounted at the opening of the slot (5), and the current direction of the Hall sensor is consistent with the current direction of the current-carrying busbar (3).

2. A current detection device according to claim 1, characterized in that: The distance between the bottom surface of the PCB board (4) and the bottom wall surface of the slot (5) does not exceed 1 mm.

3. A current detection device according to claim 1, characterized in that: The current-carrying busbar (3) is provided with a screw hole area (1) at each of its left and right ends. The screw hole areas (1) are each provided with a through screw hole (2). Bolts are provided on the screw holes (2). The current-carrying busbar (3) is crimped in series with the sampling object via the bolts.

4. A current detection device according to claim 1, characterized in that: A welding area (6) is provided at each of the left and right ends of the opening of the slot (5); a welding copper area matching the welding area (6) is provided at each of the left and right ends of the bottom surface of the PCB board (4); and the PCB board (4) is electrically connected to the current-carrying busbar (3) via the welding copper area.

5. A current detection device according to claim 4, characterized in that: The welding area (6) is covered with copper.

6. A current detection device according to claim 4, characterized in that: The maximum current carrying capacity of the PCB board (4) is not less than 1 / 10A of the current to be measured.

7. The current detection device according to claim 1, characterized in that: All components on the PCB board (4) are surface mount components.

8. The current detection device according to claim 1, characterized in that: The current-carrying busbar (3) is made of a material with good electrical conductivity and mechanical strength.

9. The current detection device according to claim 8, characterized in that: The current-carrying busbar (3) is a component made of any one of aluminum alloy, copper alloy and silver alloy.

10. The current detection device according to claim 1, characterized in that: The current signal may be a single-ended or differential signal.

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