Current sensor, inverter and vehicle

Abstract

The utility model provides a current sensor, an inverter and a vehicle. The current sensor comprises a plurality of diversion bars and a magnetic field detection device. Wherein the multiple flow guide rows are arranged in parallel side by side, each flow guide row comprises a linear section and an inclined section, and compared with the linear section, the inclined section inclines towards one direction, so that an included angle is formed between the central longitudinal axis of the linear section and the central longitudinal axis of the inclined section; in the multiple flow guide rows, the inclined sections of every two adjacent flow guide rows incline in the opposite directions. The magnetic field detection device is used for detecting the intensity of a magnetic field formed when current flows through the inclined section. According to the utility model, the inclined cutting sections are formed on the current guide rows of the current sensor, and the inclined sections of the adjacent current guide rows are inclined towards the opposite directions, so that the problem of mutual interference of magnetic fields in the detection process can be effectively solved, and the accuracy of current detection is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sensor technical field, concretely relates to a current sensor, inverter and vehicle. BACKGROUND

[0002] At present, the design scheme of the current-carrying copper bar of the coreless current sensor will exist different technical problems, and the specific as follows:

[0003] 1, the distance between the copper bars in the straight copper bar design scheme is required to be large to improve the interphase anti-interference capability, and it is more difficult to realize the arrangement in the electric drive inverter with higher and higher integration; 2, the design scheme of the slotted straight copper bar greatly enhances the local magnetic field strength, but the requirements of the copper bar stamping / cutting process and chip assembly are higher, and the chip may need to be inserted into the slot of the copper bar vertically, and the assembly is complex, and there may be the problem of poor stability; 3, the necking scheme of the straight copper bar improves the anti-interference capability by enhancing the strength of the local measured magnetic field, but the improvement is very limited, and the problem of mutual interference between phases cannot be solved; 4, the straight copper bar is arranged with a shielding plate, the interference magnetic field between phases is converted from horizontal to vertical, and the horizontal magnetic field interference on the adjacent phase is avoided, but the structure is complex, resulting in large size and high cost. SUMMARY

[0004] The utility model provides a kind of current sensor, inverter and vehicle, form cut oblique section on the current sensor's current-carrying row, and the inclined section of adjacent current-carrying row is inclined towards opposite direction, can effectively solve the problem of magnetic field mutual interference in detection process, effectively improve the accuracy of current detection.

[0005] In order to solve or improve the above technical problems to some extent, according to the utility model provides a kind of current sensor, comprising: multiple current-carrying rows and magnetic field detection device;

[0006] Among them, multiple current-carrying rows are arranged side by side, each current-carrying row includes a straight line segment and an inclined segment, compared with the straight line segment, the inclined segment is inclined towards a direction, so that an included angle is formed between the straight line segment and the center longitudinal axis of the inclined segment;

[0007] Among multiple current-carrying rows, the inclined segments of adjacent two current-carrying rows are inclined towards opposite directions.

[0008] The magnetic field detection device is used to detect the strength of the magnetic field formed when the current flows through the inclined segment.

[0009] In some embodiments, the width of the inclined segment is less than the width of the straight line segment.

[0010] In some embodiments, two sides of the width direction of the flow guide row are respectively formed with openings inward, and the width of the outside of the opening is greater than the width of the inside of the opening to form the inclined section.

[0011] In some embodiments, the depth of the opening is greater than or equal to one third of the width of the straight section of the flow guide row.

[0012] In some embodiments, the angle between the straight section and the central longitudinal axis of the inclined section is greater than or equal to 0° and less than or equal to 90°.

[0013] In some embodiments, the angle between the straight section and the central longitudinal axis of the inclined section is greater than or equal to 5° and less than or equal to 50°.

[0014] In some embodiments, the magnetic field detection device includes a plurality of magnetic field detection elements, and at least part of the orthographic projection of each magnetic field detection element is on the inclined section of the corresponding flow guide row.

[0015] In some embodiments, the magnetic field detection device further includes a detection plate, and the detection plate is one, and the detection plate is perpendicular to the plurality of flow guide rows, and the plurality of magnetic field detection elements are arranged on the detection plate; or

[0016] The detection plate is a plurality, and each magnetic field detection element is arranged on the corresponding detection plate.

[0017] According to another aspect of the present application, there is provided an inverter including the current sensor of any of the above embodiments.

[0018] According to another aspect of the present application, there is provided a vehicle including the inverter of any of the above embodiments.

[0019] The current sensor of the utility model forms linear segment and inclined segment on the flow guide row, makes the direction of current flowing through the linear segment and inclined segment of same flow guide row different, the direction of magnetic field formed at linear segment and inclined segment is also not same, and the inclined direction of inclined segment of two adjacent flow guide rows is opposite, makes the direction of current flowing through two inclined segments also not same, and the direction of magnetic field formed by current flowing through two inclined segments is also not same. Because the direction of magnetic field formed by current at inclined segment is different from the direction of magnetic field formed by linear segment, and the direction of magnetic field formed by adjacent inclined segment is also not same, when the magnetic field detection device detects the intensity of magnetic field formed at inclined segment, can effectively curb the interference of magnetic field formed at linear segment and adjacent inclined segment of same flow guide row, guarantees the accuracy of magnetic field detection device detection, at the same time because the direction of magnetic field formed by current at inclined segment is different from the direction of magnetic field formed by linear segment, and the direction of magnetic field formed by adjacent inclined segment is also not same, when multiple flow guide rows are set, can reduce the distance between flow guide rows, and then improve the integration of current sensor. At the same time, the width of inclined segment of flow guide row is less than the width of linear segment, so that in the case that the current size is unchanged, the magnetic field intensity formed when flowing through the inclined segment with smaller cross-sectional area is greater than the magnetic field intensity formed on the linear segment with larger cross-sectional area, and then the magnetic field detection device can more easily detect the magnetic field formed by the current flowing through the flow guide row, and the detection sensitivity of the current sensor is improved.

[0020] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, which can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the utility model can be more obvious and easy to understand, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of the current sensor of an embodiment of the utility model;

[0022] Figure 2 It is the local enlarged structure schematic diagram of the flow guide row of the current sensor of an embodiment of the utility model.

[0023] SYMBOL DESCRIPTION

[0024] 10, flow guide row

[0025] 100, linear segment

[0026] 110, inclined segment

[0027] 130, opening

[0028] 20, magnetic field detection device

[0029] 200, magnetic field detection element

[0030] 210, detection plate DETAILED DESCRIPTION

[0031] To further clarify the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the specific embodiments and effects of the current sensor, inverter and vehicle according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.

[0032] According to the embodiment of the utility model, a current sensor is provided, as shown in Figure 1 , comprising: a plurality of flow guide bars 10 and a magnetic field detection device 20.

[0033] Among them, the plurality of flow guide bars 10 correspond to each phase of the power supply respectively, such as when the power supply is three-phase, the flow guide bar 10 is set to three, and when the power supply is single-phase, the flow guide bar 10 is two.

[0034] Preferably, the plurality of flow guide bars 10 are copper bars.

[0035] As shown in Figure 1 and Figure 2 , the plurality of flow guide bars 10 are arranged in parallel and side by side, and each flow guide bar 10 includes a straight segment 100 and an inclined segment 110. Among them, the inclined segment 110 is inclined in a direction compared to the straight segment 100, so that the center longitudinal axis a11 of the length direction of the inclined segment 110 and the center longitudinal axis a1 of the length direction of the straight segment 100 form an included angle θ1. And among the plurality of flow guide bars 10, the inclined segments 110 of the two adjacent flow guide bars 10 are respectively inclined towards opposite directions.

[0036] As shown by the arrow in Figure 2 , after the current flows into the inclined segment 110 from the straight segment 100 of the flow guide bar 10, the direction of the current flow changes from the vertical direction flowing through the straight segment 100 to the inclined direction flowing through the inclined segment 110. The magnetic field detection device 20 is used to detect the strength of the magnetic field formed when the current flows through the inclined segment 110 of the flow guide bar 10, and then calculate the current value flowing through the flow guide bar 10 according to the detected magnetic field strength.

[0037] The directions of the magnetic fields formed by the currents flowing through the straight sections 100 and the inclined sections 110 of the same current guide 10 are different, the directions of the magnetic fields formed by the currents flowing through the inclined sections 110 of two adjacent current guides 10 are opposite, and the directions of the magnetic fields formed by the currents flowing through the two inclined sections 110 are different. The magnetic field detection device 20 can only detect the magnetic field in a certain direction. Since the directions of the magnetic fields formed by the currents in the inclined sections 110 and the straight sections 100 are different, and the directions of the magnetic fields formed by the currents in the adjacent inclined sections 110 are also different, when the magnetic field detection device 20 detects the intensity of the magnetic field formed in the inclined section 110, the interference of the magnetic fields formed in the straight section 100 and the adjacent inclined section 110 of the same current guide 10 can be effectively suppressed, and the accuracy of the detection of the magnetic field detection device 20 is ensured. Since the directions of the magnetic fields formed by the currents in the inclined sections 110 and the straight sections 100 are different, and the directions of the magnetic fields formed by the currents in the adjacent inclined sections 110 are also different, when a plurality of current guides 10 are arranged, the distance between the current guides 10 can be reduced, and the integration of the current sensor can be improved.

[0038] In an embodiment, as shown in Figure 2 Two openings 130 are formed inwardly on both sides of the width direction of the current guide 10, that is, two openings 130 are formed on the current guide 10. The width y1 of the outer side of the two openings 130 is greater than the width y2 of the inner side of the opening 130, and the inclined section 110 inclined to one direction is formed on the current guide 10.

[0039] Optionally, the opening 130 formed on the current guide 10 can be formed by a stamping process, or the opening 130 can be directly formed on the current guide 10 during the casting stage. The specific formation method of the opening 130 is not limited in the utility model.

[0040] In an embodiment, as shown in Figure 1 The width b of the inclined section 110 of the current guide 10 is less than the width w1 of the straight section 100.

[0041] In this embodiment, the width b of the inclined section 110 is set to be less than the width w1 of the straight section 100, so that when the current size is constant, the magnetic field intensity formed by the current flowing through the inclined section 110 with a smaller cross-sectional area is greater than the magnetic field intensity formed by the current flowing through the straight section 100 with a larger cross-sectional area. The magnetic field formed by the current flowing through the current guide 10 can be more easily detected by the magnetic field detection device 20, and the detection sensitivity of the current sensor can be improved.

[0042] Furthermore, the depth w2 of the opening 130 on the guide vane 10 is greater than or equal to one-third of the width w1 of the straight segment 100 of the guide vane 10, so as to ensure that the width b of the inclined segment 110 is less than the width w1 of the straight segment 100.

[0043] In one embodiment, the angle θ1 between the central longitudinal axis a11 of the inclined section 110 of the guide vane 10 and the central longitudinal axis a1 of the straight section 100 is greater than or equal to 0° and less than or equal to 90°. For example, 0°, 5°, 10°, 20°, 50°, 70°, 90°, etc.

[0044] In this embodiment, when the angle θ1 between the central longitudinal axis a11 of the inclined segment 110 of the flow guide 10 and the central longitudinal axis a1 of the straight segment 100 is 0°, the central longitudinal axis a11 of the inclined segment 110 and the central longitudinal axis a1 of the straight segment 100 are on the same straight line or parallel to each other. The magnetic field formed by the current on the straight segment 100 of the flow guide 10 will not interfere with the magnetic field formed on the inclined segment 110. When the angle θ1 between the central longitudinal axis a11 of the inclined segment 110 of the flow guide 10 and the central longitudinal axis a1 of the straight segment 100 is 45°, because the inclined directions of the two adjacent inclined segments 110 of the flow guide 10 are opposite, the angle between the central longitudinal axes of the two adjacent inclined segments 110 is 90°, that is, the central longitudinal axes of the two adjacent inclined segments 110 are perpendicular to each other. At this time, there is basically no interference between the magnetic fields formed by the current on the two adjacent inclined segments 110.

[0045] Of course, the value of the angle θ1 between the central longitudinal axis a11 of the inclined section 110 of the guide column 10 and the central longitudinal axis a1 of the straight section 100 depends on factors such as the length of the guide column 10, the width w1 of the guide column 10 and the distance w4 between two adjacent guide columns 10.

[0046] Preferably, the angle θ1 between the central longitudinal axis a11 of the inclined section 110 of the guide vane 10 and the central longitudinal axis a1 of the straight section 100 is greater than or equal to 5° and less than or equal to 50°. For example, 5°, 10°, 20°, 45°, 50°, etc.

[0047] In one embodiment, such as Figure 1 As shown, the magnetic field detection device 20 includes a plurality of magnetic field detection elements 200, and at least a portion of the orthographic projection of each magnetic field detection element 200 is located on the inclined section 110 of the corresponding current guide 10. That is, the orthographic projection of the magnetic field detection element 200 is entirely located on the inclined section 110, or a portion of the orthographic projection of the magnetic field detection element 200 is located on the inclined section 110, so as to better detect the magnetic field formed by the current on the inclined section 110.

[0048] Optionally, the magnetic field detection element 200 comprises at least one of a Hall sensor element, a magnetoresistance sensor element or a fluxgate sensor element.

[0049] In an embodiment, the magnetic field detection device 20 further comprises a detection board 210 for collecting, calculating and transmitting the magnetic field data detected by the magnetic field detection element 200.

[0050] As shown in the drawings, when the detection board 210 is one, the detection board 210 is perpendicular to the plurality of flow guides 10, and the plurality of magnetic field detection elements 200 are arranged on the detection board 210. Figure 1

[0051] When the detection board 210 is multiple, each magnetic field detection element 200 is arranged on a corresponding detection board 210.

[0052] Optionally, the detection board 210 is a PCBA (Printed Circuit Board Assembly).

[0053] Another embodiment of the utility model provides a kind of inverter, and the inverter includes the current sensor of any embodiment described above.

[0054] Another embodiment of the utility model provides a kind of vehicle, and the vehicle includes the inverter of any embodiment described above.

[0055] ​The current sensor forms the straight section 100 and the inclined section 110 on the current guide 10, so that the directions of the current flowing through the straight section 100 and the inclined section 110 of the same current guide 10 are different, the directions of the magnetic fields formed at the straight section 100 and the inclined section 110 are also different, and the inclined directions of the inclined sections 110 of the two adjacent current guides 10 are opposite, so that the directions of the currents flowing through the two inclined sections 110 are also different, and the directions of the magnetic fields formed by the currents flowing through the two inclined sections 110 are also different. Because the direction of the magnetic field formed by the current in the inclined section 110 is different from the direction of the magnetic field formed by the current in the straight section 100, and also different from the direction of the magnetic field formed by the current in the adjacent inclined section 110, when the magnetic field detection device 20 detects the intensity of the magnetic field formed at the inclined section 110, the interference of the magnetic fields formed at the straight section 100 and the adjacent inclined section 110 of the same current guide 10 can be effectively suppressed, and the accuracy of the detection of the magnetic field detection device 20 is ensured. At the same time, because the direction of the magnetic field formed by the current in the inclined section 110 is different from the direction of the magnetic field formed by the current in the straight section 100, and also different from the direction of the magnetic field formed by the current in the adjacent inclined section 110, when the plurality of current guides 10 are arranged, the distance between the current guides 10 can be reduced, and the integration of the current sensor is improved. At the same time, the width of the inclined section 110 of the current guide 10 is smaller than the width of the straight section 100, so that when the current size is unchanged, the magnetic field intensity formed when the current flows through the inclined section 110 with a smaller cross-sectional area is greater than the magnetic field intensity formed when the current flows through the straight section 100 with a larger cross-sectional area, and the magnetic field formed by the current flowing through the current guide 10 can be more easily detected by the magnetic field detection device 20, and the detection sensitivity of the current sensor is improved.

[0056] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above with a preferred embodiment, it is not intended to limit the utility model. Any skilled person in the art can make some changes or modifications to the disclosed technical content without departing from the technical solution of the utility model, and any simple modification, equivalent change and modification of the above embodiment based on the technical essence of the utility model are still within the scope of the technical solution of the utility model.

Claims

1. A current sensor, characterized by, The current sensor comprises: a plurality of flow guides and a magnetic field detection device; wherein the plurality of flow guides are arranged in parallel to each other, each of the flow guides comprises a straight segment and an inclined segment, the inclined segment is inclined to a direction compared with the straight segment, so that an included angle is formed between the straight segment and the central longitudinal axis of the inclined segment; in the plurality of flow guides, the inclined segments of two adjacent flow guides are inclined to opposite directions; the magnetic field detection device is used to detect the strength of the magnetic field formed when the current flows through the inclined segment.

2. The current sensor of claim 1, wherein, The width of the inclined segment is smaller than the width of the straight segment.

3. The current sensor according to claim 1 or 2, characterized in that, The two sides of the flow guide in the width direction are respectively formed with openings, the width of the outside of the opening is greater than the width of the inside of the opening, so as to form the inclined segment.

4. The current sensor of claim 3, wherein, The depth of the opening is greater than or equal to one third of the width of the straight segment of the flow guide.

5. The current sensor of claim 1, wherein, The included angle between the straight segment and the central longitudinal axis of the inclined segment is greater than or equal to 0° and less than or equal to 90°.

6. The current sensor of claim 5, wherein, The included angle between the straight segment and the central longitudinal axis of the inclined segment is greater than or equal to 5° and less than or equal to 50°.

7. The current sensor of claim 1, wherein, The magnetic field detection device comprises a plurality of magnetic field detection elements, at least part of the orthographic projection of each of the magnetic field detection elements is on the inclined segment of the corresponding flow guide.

8. The current sensor of claim 7, wherein, The magnetic field detection device further comprises a detection plate, the detection plate is one, the detection plate is perpendicular to the plurality of flow guides, and the plurality of magnetic field detection elements are arranged on the detection plate; or The detection plate is a plurality of, and each of the magnetic field detection elements is arranged on the corresponding detection plate.

9. An inverter, characterized by The current sensor comprises any one of claims 1-8.

10. A vehicle characterized by comprising: The inverter comprises claim 9.

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