Current detection device and electronic device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GOERTEK MICROELECTRONICS CO LTD
- Filing Date
- 2023-09-22
- Publication Date
- 2026-05-29
AI Technical Summary
Existing current detection methods require a magnetic core structure, which leads to difficulties in layout, large size, high cost, and problems with poor current measurement response and limited range.
A cavity is formed by setting first and second recessed structures on the conductive busbar, and first and second magnetic induction units are built in it. The current value is detected by differential method, avoiding the use of magnetic core structure.
It achieves accurate current detection and resistance to external interference, reduces cost and size, and avoids problems caused by hysteresis and magnetic saturation.
Smart Images
Figure CN117233452B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sensor technology, and more specifically, to a current detection device and an electronic device. Background Technology
[0002] Currently, when detecting the current value Ip flowing through the busbar, such as Figure 1 As shown, a magnetic core structure is typically required to surround the busbar, with an open section (measuring area) to accommodate the magnetic sensor. The magnetic field generated by the current flowing through the conductor around the busbar, under the influence of the magnetic core structure, causes the open section to form a uniformly amplified magnetic field. The magnetic sensor senses this uniformly amplified magnetic field and outputs a voltage signal linearly corresponding to the current value Ip. Based on this, the current value of Ip is detected.
[0003] However, existing methods for detecting the current value of Ip have problems such as difficulty in placement, large size, and high cost due to the need to arrange magnetic core structures, as well as poor current measurement response due to hysteresis and limited current measurement range due to magnetic saturation. Summary of the Invention
[0004] One objective of this application is to provide a new current detection device.
[0005] According to a first aspect of this application, a current detection device is provided, comprising: a conductive busbar, a first magnetic induction unit, a second magnetic induction unit, and an induction signal processing unit, wherein:
[0006] The conductive bus includes a first conductive sub-bus and a second conductive sub-bus. The first conductive sub-bus has a first recessed structure, and the second conductive sub-bus has a second recessed structure. The first conductive sub-bus and the second conductive sub-bus are attached together, and the first recessed structure and the second recessed structure form a cavity.
[0007] The first magnetic induction unit and the second magnetic induction unit are located inside the cavity. The first magnetic induction unit and the second magnetic induction unit have the same measurement direction. The first magnetic induction unit outputs a first induction signal to the induction signal processing unit, and the second magnetic induction unit outputs a second induction signal to the induction signal processing unit.
[0008] The sensing signal processing unit determines the current value of the current flowing through the busbar based on the first sensing signal and the second sensing signal.
[0009] Optionally, the first recessed structure and the second recessed structure are symmetrical.
[0010] Optionally, the first magnetic induction unit has a first distance from the bottom of the first recessed structure, and the second magnetic induction unit has a second distance from the bottom of the second recessed structure, wherein the first distance and the second distance are the same.
[0011] Optionally, the first recessed structure has a first sidewall, the second recessed structure has a second sidewall, and the first sidewall and the second sidewall are connected.
[0012] The first magnetic induction unit is at a third distance from the first sidewall of the first recessed structure;
[0013] The second magnetic induction unit has a fourth distance from the first sidewall of the second recessed structure;
[0014] The third distance and the fourth distance are the same.
[0015] Optionally, the current detection device further includes a circuit board, through which the first magnetic induction unit and the second magnetic induction unit are connected to the induction signal processing unit.
[0016] Optionally, the first end of the conductive busbar has a first connection point, the second end of the conductive busbar has a second connection point, and the conductor under test is connected between the first connection point and the second connection point.
[0017] Optionally, the first conductive busbar and the second conductive busbar are attached by welding or threading.
[0018] Optionally, the conductive busbar is made of copper or aluminum.
[0019] According to a second aspect of this application, an electronic device is provided, the electronic device comprising a current detection device as described in any one of the first aspects.
[0020] This application provides a current detection device, including: a conductive busbar, a first magnetic induction unit, a second magnetic induction unit, and an induction signal processing unit. The conductive busbar includes a first conductive sub-busbar and a second conductive sub-busbar. The first conductive sub-busbar has a first recessed structure, and the second conductive sub-busbar has a second recessed structure. The first and second conductive sub-busbars are attached together, and the first and second recessed structures form a cavity. The first and second magnetic induction units are located inside the cavity, and their measurement directions are the same. The first magnetic induction unit outputs a first induction signal to the induction signal processing unit, and the second magnetic induction unit outputs a second induction signal to the induction signal processing unit. The induction signal processing unit determines the current value flowing through the conductive busbar based on the first and second induction signals. The current detection device provided in this application does not require a magnetic core structure to detect the current value flowing through the conductive busbar. This avoids the problems of traditional methods that use magnetic core structures to detect the current value of Ip, such as difficulty in layout, large size, high cost, poor current measurement response due to hysteresis, and limited current measurement range due to magnetic saturation.
[0021] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.
[0023] Figure 1 This is a schematic diagram of the detection architecture used in traditional technology to detect the current value Ip flowing through a busbar.
[0024] Figure 2 This is a schematic diagram of the structure of a current detection device provided in an embodiment of this application. Figure 1 ;
[0025] Figure 3 This is a front view of a current detection device provided in an embodiment of this application;
[0026] Figure 4 This is a schematic diagram of the physical structure of a conductive bus provided in an embodiment of this application;
[0027] Figure 5 This is a schematic diagram of the structure of a current detection device provided in an embodiment of this application. Figure 2 ;
[0028] Figure 6 This is a schematic diagram of the structure of a current detection device provided in an embodiment of this application. Figure 3;
[0029] Figure label:
[0030] 1-Conducting busbar;
[0031] 11-First conductor bus; 111-First recessed structure; 1111-Bottom of the first recessed structure; 1112-First sidewall;
[0032] 12-Second conductor busbar; 121-Second recessed structure; 1211-Bottom of the second recessed structure; 1212-Second sidewall;
[0033] 2-First magnetic induction unit; 3-Second magnetic induction unit; 4-Circuit board; a-Receiving cavity. Detailed Implementation
[0034] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.
[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0037] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0039] like Figure 2 As shown in the figure, this application provides a current detection device, which includes: a conductive busbar 1, a first magnetic induction unit 2, a second magnetic induction unit 3, and an induction signal processing unit (not shown in the figure), wherein:
[0040] The conductive bus 1 includes a first conductive bus 11 and a second conductive bus 12. The first conductive bus 11 has a first recessed structure 111, and the second conductive bus 12 has a second recessed structure 121. The first conductive bus 11 and the second conductive bus 12 are attached together, and the first recessed structure 111 and the second recessed structure 112 form a cavity a.
[0041] The first magnetic induction unit 2 and the second magnetic induction unit 3 are located inside cavity a. The first magnetic induction unit 2 and the second magnetic induction unit 3 have the same measurement direction. The first magnetic induction unit 2 outputs a first induction signal to the induction signal processing unit, and the second magnetic induction unit 3 outputs a second induction signal to the induction signal processing unit.
[0042] The induction signal processing unit determines the current value of the current flowing through the busbar based on the first induction signal and the second induction signal.
[0043] like Figure 3 The image shows a front view of the current detection device provided in this embodiment. The current Ip flows through the conductor 1 in the current device. The current detection device provided in this embodiment is used to detect the current value of Ip using a differential method.
[0044] Figure 2 This is a structural schematic diagram of the current detection device provided in the embodiments of this application from View A perspective.
[0045] In this embodiment, the conductive bus 1 includes a first conductive bus 11 and a second conductive bus 12. The first conductive bus 11 and the second conductive bus 12 are in contact with each other, and the current flowing through the first conductive bus 11 and the second conductive bus 12 is the same. Based on this, the first conductive bus 11 and the second conductive bus 12 form the same magnetic field at corresponding positions. Figure 5 As shown, the current flowing through the first conductor bus 11 and the second conductor bus 12 is 1 / 2Ip.
[0046] The first conductive bus 11 has a first recessed structure 111, and the second conductive bus 12 has a second recessed structure 121. The first recessed structure 111 and the second recessed structure 121 form a cavity a to accommodate the first magnetic induction unit 2 and the second magnetic induction unit 3. Figure 2 and Figure 5 As shown, the first recessed structure 111 and the second recessed structure 121 can form a shielding structure, which can play a shielding and isolation role and have the ability to resist external magnetic field interference.
[0047] See Figure 5 As shown, the magnetic field directions of the first recessed structure 111 and the second recessed structure 121 are as follows: Figure 5 As shown by the arrows, it can be seen that within cavity a, the magnetic field direction of the first recessed structure 111 and the magnetic field direction of the second recessed structure 121 are opposite.
[0048] In one embodiment of this application, the physical structure of the conductive bus 1 can be exemplarily as shown below. Figure 4 As shown.
[0049] In one embodiment of this application, the conductive busbar 1 is made of copper or aluminum. Of course, the conductive busbar 1 can also be made of other materials.
[0050] In one embodiment of this application, the first conductive busbar 11 and the second conductive busbar 12 can be joined together by welding or threading. Welding can be, for example, spot welding. Furthermore, the first conductive busbar 11 and the second conductive busbar 12 can be formed in a single stamping process, simplifying the manufacturing process.
[0051] In this embodiment, there is no need to slot or open holes in the conductive busbar 1, so the resistance value of the conductive busbar 1 is not changed, so there is no additional energy loss, low heat generation, less production waste, and low cost.
[0052] In this embodiment, the first magnetic induction unit 2 and the second magnetic induction unit 3 are typically magnetic sensors of the same specifications, and their working principles are the same. Taking the first magnetic induction unit 2 as an example, its working principle is typically as follows: the current flowing through the conductor being measured generates a magnetic field around the conductor being measured; after the first magnetic induction unit 2 senses the magnetic field, it outputs a voltage signal that is linearly corresponding to the current value flowing through the conductor being measured after signal amplification and conditioning.
[0053] Furthermore, the detection result of the first magnetic induction unit 2 is recorded as the first induction signal. Correspondingly, the detection result of the second magnetic induction unit 3 is recorded as the second induction signal. Since the magnetic field direction of the first recessed structure 111 and the magnetic field direction of the second recessed structure 121 are opposite within cavity a, and the measurement directions of the first magnetic induction unit 2 and the second magnetic induction unit 3 are the same, the first induction signal and the second induction signal are two voltage signals with the same value but opposite polarities.
[0054] The first magnetic induction unit 2 outputs the detected first induction signal to the induction signal processing unit, and the second magnetic induction unit 3 outputs the detected second induction signal to the induction signal processing unit.
[0055] Because the shielding structure formed by the first recessed structure 111 and the second recessed structure 121 can provide shielding and isolation, and has the ability to resist external magnetic field interference, the interference level of the first magnetic induction unit 2 and the second magnetic induction unit 3 located in the receiving cavity a formed by the first recessed structure 111 and the second recessed structure 121 is reduced. Therefore, based on this, both the first magnetic induction unit 2 and the second magnetic induction unit 3 can output more accurate detection results.
[0056] In this embodiment of the application, after obtaining the first sensing signal and the second sensing signal, the sensing signal processing unit calculates the difference between the two; the difference is amplified to obtain a gain amplification value that has a known linear relationship with the current value of current Ip; the current value of current Ip is obtained through the known linear relationship and the gain amplification value.
[0057] Furthermore, the sensing signal processing unit can output the current value of the obtained current Ip, such as through voice output or display output.
[0058] It is understandable that, in the presence of external interference, the strength and direction of the magnetic fields generated by the first magnetic induction unit 2 and the second magnetic induction unit 3 can be approximated as the same. Furthermore, during the process of obtaining the current value Ip through differential processing, the induction signal processing unit can cancel out the corresponding external interference portions of the first and second induction signals. Therefore, the current detection device provided in this embodiment can effectively suppress external interference.
[0059] It should be noted that the location of the sensing signal processing unit can be set according to actual needs.
[0060] As can be seen from the above, the current detection device provided in this application embodiment does not require a magnetic core structure to detect the current value flowing through the busbar 1. This avoids the problems of traditional methods that use a magnetic core structure to detect the current value of Ip, such as difficulty in placement, large size, high cost, poor current measurement response due to hysteresis, and limited current measurement range due to magnetic saturation.
[0061] This application provides a current detection device, including: a conductive busbar, a first magnetic induction unit, a second magnetic induction unit, and an induction signal processing unit. The conductive busbar includes a first conductive sub-busbar and a second conductive sub-busbar. The first conductive sub-busbar has a first recessed structure, and the second conductive sub-busbar has a second recessed structure. The first and second conductive sub-busbars are attached together, and the first and second recessed structures form a cavity. The first and second magnetic induction units are located inside the cavity, and their measurement directions are the same. The first magnetic induction unit outputs a first induction signal to the induction signal processing unit, and the second magnetic induction unit outputs a second induction signal to the induction signal processing unit. The induction signal processing unit determines the current value flowing through the conductive busbar based on the first and second induction signals. The current detection device provided in this application does not require a magnetic core structure to detect the current value flowing through the conductive busbar. This avoids the problems of traditional methods that use magnetic core structures to detect the current value of Ip, such as difficulty in layout, large size, high cost, poor current measurement response due to hysteresis, and limited current measurement range due to magnetic saturation.
[0062] In one embodiment of this application, such as Figure 2 , Figure 4 , Figure 5 as well as Figure 6 As shown, in the current detection device provided in this application embodiment, the first recessed structure 111 and the second recessed structure 121 are symmetrical.
[0063] In this embodiment, the first recessed structure 111 and the second recessed structure 121 are symmetrical. This ensures that the current flowing through the first conductive busbar 11 and the second conductive busbar 12 is as similar as possible. This makes the magnitudes of the first induced signal obtained by the first electromagnetic sensor 2 and the second induced signal detected by the second electromagnetic sensor 3 as similar as possible. Based on this, the induced signal processing unit can more accurately determine the current value flowing through the conductive busbar.
[0064] It should be noted that, in the embodiments of this application, the structures of the first conductive busbar 11 other than the first recessed structure 111, and the structures of the second conductive busbar 12 other than the second recessed structure 121 are not limited.
[0065] In one embodiment of this application, such as Figure 6 As shown, the first magnetic induction unit 2 has a first distance L1 with the bottom 1111 of the first recessed structure, and the second magnetic induction unit 3 has a second distance L2 with the bottom 1211 of the second recessed structure. The second distance L2 is the same as the first distance L1.
[0066] It is understandable that, given the same current flowing through the first conductive busbar 11 and the second conductive busbar 12, and that the first and second conductive busbars 11 and 12 form the same magnetic field at corresponding positions, and assuming the first distance L1 and the second distance L2 are the same, the magnetic field strength sensed by the first magnetic induction unit 2 and the magnetic field strength sensed by the second magnetic induction unit 3 should be as similar as possible. This ensures that the magnitudes of the first induced signal obtained by the first electromagnetic sensor 2 and the second induced signal detected by the second electromagnetic sensor 3 are as similar as possible. Based on this, the induction signal processing unit can more accurately determine the current value flowing through the conductive busbars.
[0067] Based on the above embodiments, in one embodiment of this application, such as Figure 6 As shown, the first recessed structure 111 has a first sidewall 1112, the second recessed structure 121 has a second sidewall 1212, and the first sidewall 1112 and the second sidewall 1212 are connected.
[0068] The first magnetic induction unit 2 has a third distance L3 from the first sidewall 1112 of the first recessed structure 111;
[0069] The second magnetic induction unit 3 has a fourth distance L4 from the second sidewall 1212 of the second recessed structure 121;
[0070] The fourth distance L4 is the same as the third distance L3.
[0071] It is understandable that, given the same current flowing through the first conductive busbar 11 and the second conductive busbar 12, and that the first and second conductive busbars 11 and 12 form the same magnetic field at corresponding positions, and with the third distance L3 and the fourth distance L4 being the same, the magnetic field strength sensed by the first magnetic sensor 2 and the magnetic field sensed by the second magnetic induction unit 3 should be as similar as possible. This ensures that the magnitudes of the first induced signal obtained by the first electromagnetic sensor 2 and the second induced signal detected by the second electromagnetic sensor 3 are as similar as possible. Based on this, the induction signal processing unit can more accurately determine the current value flowing through the conductive busbars.
[0072] In one embodiment of this application, the sensing signal processing unit provided in this application embodiment further includes a circuit board 4, and the first magnetic induction unit 2 and the second magnetic induction unit 3 are connected to the sensing signal processing unit through the circuit board 4.
[0073] In this embodiment, the circuit board 4 can carry the first magnetic induction unit 2, the second magnetic induction unit 3 and the induction signal processing unit, and can also serve as a connector between the first magnetic induction unit 2, the second magnetic induction unit 3 and the induction signal processing unit respectively.
[0074] In one embodiment of this application, the sensing signal processing unit may be disposed in the circuit board 4.
[0075] In one embodiment of this application, the first end of the conductive bus 1 has a first connection point, the second end of the conductive bus 1 has a second connection point, and the conductor to be tested is connected between the first connection point and the second connection point.
[0076] In this embodiment, the current detection device provided can charge a current sensor, and the conductor to be measured can be connected in series between a first connection point and a second connection point. Based on this, the current on the conductor to be measured is introduced into the busbar 1. Since the current on the busbar 1 and the current on the conductor to be measured are the same, the current value on the conductor to be measured can be detected by detecting the current value flowing through the busbar 1.
[0077] This application also provides an electronic device that includes a current detection device as provided in any of the above embodiments.
[0078] It should be noted that the embodiments of this application do not limit the specific form of the electronic device.
[0079] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.
Claims
1. A current detection device, characterized in that, include: The system comprises a conductive bus (1), a first magnetic induction unit (2), a second magnetic induction unit (3), and an induction signal processing unit, wherein: The conductive bus (1) includes a first conductive sub-bus (11) and a second conductive sub-bus (12). The first conductive sub-bus (11) has a first recessed structure (111), and the second conductive sub-bus (12) has a second recessed structure (121). The first conductive sub-bus (11) and the second conductive sub-bus (12) are attached together, and the first recessed structure (111) and the second recessed structure (121) form a cavity (a). The first magnetic induction unit (2) and the second magnetic induction unit (3) are located inside the cavity (a). The first magnetic induction unit (2) and the second magnetic induction unit (3) have the same measurement direction. The first magnetic induction unit (2) outputs a first induction signal to the induction signal processing unit, and the second magnetic induction unit (3) outputs a second induction signal to the induction signal processing unit. The sensing signal processing unit determines the current value of the current flowing through the busbar (1) based on the first sensing signal and the second sensing signal.
2. The current detection device according to claim 1, characterized in that, The first recessed structure (111) and the second recessed structure (121) are symmetrical.
3. The current detection device according to claim 1, characterized in that, The first magnetic induction unit (2) has a first distance (L1) with the bottom of the first recessed structure (1111), and the second magnetic induction unit (3) has a second distance (L2) with the bottom of the second recessed structure (1211). The first distance (L1) and the second distance (L2) are the same.
4. The current detection device according to claim 3, characterized in that, The first recessed structure (111) has a first sidewall (1112), and the second recessed structure (121) has a second sidewall (1212). The first sidewall (1112) and the second sidewall (1212) are connected. The first magnetic induction unit (2) has a third distance (L3) from the first sidewall (1112) of the first recessed structure (111); The second magnetic induction unit (3) has a fourth distance (L4) from the second sidewall (1212) of the second recessed structure (121); The third distance (L3) and the fourth distance (L4) are the same.
5. The current detection device according to claim 3, characterized in that, The current detection device also includes a circuit board (4), and the first magnetic induction unit (2) and the second magnetic induction unit (3) are connected to the induction signal processing unit through the circuit board (4).
6. The current detection device according to claim 1, characterized in that, The first end of the conductive bus (1) has a first connection point, and the second end of the conductive bus (1) has a second connection point. The conductor to be tested is connected between the first connection point and the second connection point.
7. The current detection device according to claim 1, characterized in that, The first conductive busbar (11) and the second conductive busbar (12) are attached by welding or screwing.
8. The current detection device according to claim 1, characterized in that, The conductive bus (1) is made of copper or aluminum.
9. An electronic device, characterized in that, The electronic device includes a current detection device as described in any one of claims 1-8.