A small module current sensor crosstalk shielding structure

Abstract

The utility model relates to sensor technical field discloses a small module current sensor crosstalk shielding structure, including power module plastic package, current sensor, AC copper bar and shielding case, the AC copper bar sets up in power module plastic package, the shielding case is arranged in the periphery of power module plastic package's AC copper bar, the current sensor includes U phase current sensor, V phase current sensor and W phase current sensor, the AC copper bar includes U phase AC copper bar, V phase AC copper bar and W phase AC copper bar, the shielding case includes U phase shielding case, V phase shielding case and W phase shielding case, in the utility model, through setting up the shielding case in the periphery of power module plastic package's AC copper bar, effectively blocks the magnetic field interference that adjacent phase current produced, has solved the problem that the hall device detects the magnetic field crosstalk of big of the problem that the middle phase distance reduces in compact power module, has guaranteed the accuracy of current sensor to phase current detection.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a crosstalk shielding structure for a small modular current sensor. Background Technology

[0002] The Hall current sensor is based on the magnetic balance Hall principle. According to the Hall effect principle, a current Ic flows from the AC copper busbar terminal of the power module plastic package, and a magnetic field with magnetic induction intensity B is applied in the normal direction of the AC copper busbar plane. Then, a potential VH will be generated in the direction perpendicular to the current and the magnetic field (i.e., between the Hall output terminals), which is called the Hall potential. Its magnitude is proportional to the product of the control current I and the magnetic induction intensity B.

[0003] In current coreless phase current detection technology, current sensors mainly measure the magnitude of phase current indirectly by detecting the magnetic induction intensity in an open space. However, when facing more compact power module designs, the distance between phases will decrease accordingly. This will lead to an increase in magnetic field crosstalk experienced by the current sensor during the detection process. This increase in magnetic field crosstalk will adversely affect the measurement accuracy of the current sensor, and thus affect the accuracy and reliability of the entire current detection system. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a crosstalk shielding structure for a small modular current sensor, which aims to improve the existing current sensor crosstalk shielding structure. When facing a more compact power module design, the distance between phases will decrease accordingly, which will lead to an increase in magnetic field crosstalk during the current sensor detection process.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a crosstalk shielding structure for a small modular current sensor, comprising a power module plastic package, a current sensor, an AC copper busbar, and a shielding cover; the AC copper busbar is disposed inside the power module plastic package, the current sensor is disposed correspondingly to the AC copper busbar, and the shielding cover is arranged around the AC copper busbar of the power module plastic package to prevent crosstalk from occurring in the current sensor.

[0006] Furthermore, the current sensor includes a U-phase current sensor, a V-phase current sensor, and a W-phase current sensor.

[0007] Furthermore, the AC copper busbar includes a U-phase AC copper busbar, a V-phase AC copper busbar, and a W-phase AC copper busbar.

[0008] Furthermore, the shielding cover includes a U-phase shielding cover, a V-phase shielding cover, and a W-phase shielding cover.

[0009] Furthermore, the shielding cover and the power module are encapsulated in a single integrated plastic package.

[0010] Furthermore, the shielding cover is a U-shaped shielding cover.

[0011] This utility model has the following beneficial effects:

[0012] 1. In this utility model, by setting shielding covers (such as U-phase shielding cover, V-phase shielding cover, and W-phase shielding cover) around the AC copper busbar of the power module, the magnetic field interference generated by the adjacent phase current is effectively blocked, which solves the problem of increased crosstalk of the Hall device detection magnetic field caused by the reduced phase distance in the compact power module, and ensures the accuracy of the current sensor in detecting the phase current.

[0013] 2. In this utility model, the shielding cover and the power module are encapsulated in an integrated plastic form. While achieving effective shielding, the external interface form of the product is not changed, ensuring the compatibility of the overall structure of the power module and the ease of installation, without the need to adjust the existing external connection method. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of a crosstalk shielding structure for a small modular current sensor proposed in this utility model;

[0015] Figure 2 This is a schematic diagram of the shielding structure of a small modular current sensor crosstalk shielding structure proposed in this utility model.

[0016] Legend:

[0017] 1. Power module; 11. U-phase current sensor; 12. V-phase current sensor; 13. W-phase current sensor; 21. U-phase AC busbar; 22. V-phase AC busbar; 23. W-phase AC busbar; 31. U-phase shielding cover; 32. V-phase shielding cover; 33. W-phase shielding cover. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figure 1 - Figure 2This utility model provides an embodiment of a small modular current sensor crosstalk shielding structure, including a power module plastic package 1, a current sensor, an AC copper busbar, and a shielding cover; the AC copper busbar is disposed inside the power module plastic package 1, the current sensor is disposed correspondingly to the AC copper busbar, and the shielding cover is arranged around the AC copper busbar of the power module plastic package 1 to prevent crosstalk from the current sensor. The current sensor includes a U-phase current sensor 11, a V-phase current sensor 12, and a W-phase current sensor 13. The AC copper busbar includes a U-phase AC copper busbar 21, a V-phase AC copper busbar 22, and a W-phase AC copper busbar 23. The shielding cover includes a U-phase shielding cover 31, a V-phase shielding cover 32, and a W-phase shielding cover 33. The shielding cover and the power module plastic package 1 are integrally encapsulated, and the shielding cover is a U-shaped shielding cover.

[0020] Specifically, the device has dedicated shielding covers (U-phase shielding cover 31, V-phase shielding cover 32, and W-phase shielding cover 33) around each phase AC copper busbar (U-phase AC copper busbar 21, V-phase AC copper busbar 22, and W-phase AC copper busbar 23). These shielding covers are made of high-performance magnetic materials and have good magnetic permeability and shielding effectiveness. Through their physical isolation, they can effectively block the magnetic field of adjacent phases from spreading to the area where the target current sensors (U-phase current sensor 11, V-phase current sensor 12, and W-phase current sensor 13) are located, thereby significantly reducing the interference of crosstalk magnetic field on the Hall potential detection process. In addition, the shielding covers and the power module are encapsulated in a highly integrated one-piece plastic form. This design not only ensures the maximization of shielding effect, but also does not change the external interface form of the product, thereby effectively ensuring the stability and compatibility of the overall structure of the power module.

[0021] In this design, the tight fit of the shield and the maximum shielding effectiveness enable the Hall current sensor to maintain high-precision measurement and stable signal output even in a compact space. Secondly, the high-performance magnetic material ensures the long-term stability and reliability of the shield, thereby extending the service life of the power module. Furthermore, the integrated plastic coating design simplifies the manufacturing process, improves production efficiency, and reduces production costs.

[0022] In summary, this device effectively solves the magnetic field crosstalk problem by installing specialized shielding covers around the AC copper busbars of each phase and adopting a highly integrated, one-piece plastic coating, ensuring the accuracy of current measurement and the reliability of the system. This design not only improves the performance and stability of the power module but also reduces production costs, providing a solid technical guarantee for the stable operation of the power system.

[0023] Working principle: The device has shielding covers (U-phase shielding cover 31, V-phase shielding cover 32, and W-phase shielding cover 33) respectively set around the AC copper busbars of each phase (U-phase AC copper busbar 21, V-phase AC copper busbar 22, and W-phase AC copper busbar 23). The shielding covers, through physical isolation, prevent the magnetic field of adjacent phases from spreading to the area where the target current sensors (U-phase current sensor 11, V-phase current sensor 12, and W-phase current sensor 13) are located, reducing the interference of crosstalk magnetic field on Hall potential detection. The shielding covers and the power module plastic encapsulation 1 are integrated into one plastic form, which ensures the shielding effect without changing the external interface form of the product, ensuring the stability and compatibility of the overall structure of the power module. This design allows the shielding covers to fit tightly around the AC copper busbars, maximizing the shielding effectiveness and ensuring the measurement accuracy and signal stability of the Hall current sensors in a compact space.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crosstalk shielding structure for a small modular current sensor, characterized in that, Includes a power module plastic package (1), a current sensor, an AC copper busbar, and a shielding cover; The AC copper busbar is disposed inside the power module plastic package (1), the current sensor is disposed corresponding to the AC copper busbar, and the shield is arranged around the AC copper busbar of the power module plastic package (1) to prevent crosstalk of the current sensor.

2. The crosstalk shielding structure for a small modular current sensor according to claim 1, characterized in that: The current sensors include a U-phase current sensor (11), a V-phase current sensor (12), and a W-phase current sensor (13).

3. The crosstalk shielding structure for a small modular current sensor according to claim 1, characterized in that: The AC copper busbars include U-phase AC copper busbars (21), V-phase AC copper busbars (22) and W-phase AC copper busbars (23).

4. The crosstalk shielding structure for a small modular current sensor according to claim 1, characterized in that: The shielding covers include a U-phase shielding cover (31), a V-phase shielding cover (32), and a W-phase shielding cover (33).

5. The crosstalk shielding structure for a small modular current sensor according to claim 1, characterized in that: The shielding cover and the power module are encapsulated in a single piece (1).

6. The crosstalk shielding structure for a small modular current sensor according to claim 1, characterized in that: The shielding cover is a U-shaped shielding cover.

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