Low-voltage adapter and high-voltage adapter for high-low voltage coupling measurement

Abstract

The utility model relates to a low-voltage adapter and a high-voltage adapter for high-low voltage coupling measurement, which belong to the technical field of electromagnetic compatibility test, and comprise an L-shaped grounding plate which is provided with a horizontal part and a vertical part, and the horizontal part is used for keeping good grounding connection with a test desktop; the N-type female joint four-hole flange is arranged on the vertical part of the L-type grounding plate, one end of the N-type female joint four-hole flange is a radio frequency port, and the other end of the N-type female joint four-hole flange is a core One end of the solid copper column is connected with the core wire part of the N-type female joint four-hole flange, and the other end is connected with the wire pressing device; the insulation isolation buckle is fixedly connected with the N-type female joint four-hole flange, the L-type grounding plate and the insulation isolation buckle; and the wire pressing device has an opening and closing structure and is fixedly connected with the insulation isolation buckle. The low-voltage adapter realizes efficient and stable signal transmission and good grounding effect through optimizing the structural design; and the high-voltage adapter is additionally provided with a shielding device on the basis of the low-voltage adapter, so that the electromagnetic shielding performance is further improved, and the accuracy and the stability of the test are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic compatibility testing, and particularly relates to a high-low voltage coupling attenuation testing device and method for new energy vehicle parts. Background Technique

[0002] With the booming development of the new energy vehicle industry, the number of pure electric vehicles and hybrid vehicles continues to grow. The core of these models lies in their high-voltage electric drive systems, which are significantly different from traditional vehicles. In addition to conventional low-voltage electronic devices, they also integrate various high-voltage components and systems. However, the electromagnetic interference generated by high-voltage components during operation far exceeds that of low-voltage components, and the complex interference coupling between high voltage and low voltage poses a serious threat to key safety devices such as control systems, communication networks, and navigation devices in the vehicle. This makes the electromagnetic compatibility (EMC) performance of new energy vehicles face greater challenges.

[0003] In particular, the coupling between high voltage and low voltage may not only affect the control circuits, signal lines, and sensors inside the vehicle, but also affect other connected electronic devices through different transmission paths.

[0004] In the CISPR 25 standard released in 2021, although it mentions using a vector network analyzer to measure and verify the high-low voltage coupling attenuation of unpowered high-voltage components, details such as specific equipment layout and connection methods are not clear, especially the connection method between the vector network analyzer and high-low voltage cables. If the system is temporarily built for each test, then for samples of different specifications and sizes, the connector positions and connection methods on the high-voltage and low-voltage sides may be different, which poses a challenge to the repeatability of test results. How to ensure that these differences do not affect the consistency of test results is the key problem currently faced. Content of the Utility Model

[0005] The purpose of the utility model: To provide a low-voltage and high-voltage adapter for measuring high / low voltage coupling of new energy vehicle parts, which can simultaneously adapt to high-voltage component products of different manufacturers, different products, and different specifications and shapes for detection, helping new energy vehicle manufacturers reduce the electromagnetic compatibility risk of high / low voltage coupling during the R & D stage, enabling low-voltage devices such as in-vehicle radio communication, navigation, and control to meet the limit requirements specified by the standard, helping manufacturers better control the production cycle, and reducing production costs. The low-voltage adapter achieves efficient and stable signal transmission and good grounding effect through optimized structural design; the high-voltage adapter adds a shielding device on the basis of the low-voltage adapter, further improving the electromagnetic shielding performance and ensuring the accuracy and stability of the test.

[0006] To achieve the above purpose, the technical solution of the utility model provides a low-voltage adapter and a high-voltage adapter for high-low voltage coupling measurement, including:

[0007] L-shaped ground plate, which is a metal plate with a horizontal part and a vertical part. The horizontal part is used to maintain a good ground connection with the test tabletop;

[0008] N-type female four-hole flange, installed on the vertical part of the L-shaped ground plate. One end is a radio frequency port, and the other end is a core wire part, which is used to connect a vector network analyzer and a solid copper column;

[0009] The solid copper column, one end is connected to the core wire part of the N-type female four-hole flange, and the other end is connected to a wire pressing device;

[0010] Insulating isolation buckle, used to isolate the N-type female four-hole flange and the wire pressing device, and fixedly connect the N-type female four-hole flange, the L-shaped ground plate and the insulating isolation buckle;

[0011] The wire pressing device has an opening and closing structure, is used to connect the low-voltage connecting wire of the object to be measured, and fixedly connects the insulating isolation buckle.

[0012] Preferably, the insulating isolation buckle is made of nylon plastic material, the solid copper column is made of pure copper material, and the wire pressing device is made of solid pure copper material.

[0013] Preferably, the N-type female four-hole flange is installed on the vertical part of the L-shaped ground plate by means of threaded connection and flange fixation.

[0014] Preferably, the horizontal part of the L-shaped ground plate has an aperture of M6 or M8 in the middle, the side edge of the vertical part has an aperture of M6 or M8, and the vertical part has an aperture in the middle for fixedly installing the N-type female four-hole flange plate and passing through the radio frequency core wire.

[0015] Preferably, the specification of the N-type female four-hole flange is 25mm * 25mm. One end is an N-type female head for a vector network analyzer port with an adaptation frequency as low as 150 kHz, and the other end is a core wire part.

[0016] Preferably, the length of the solid copper column is 15mm, the diameter is 6mm, and it is welded to the core wire part of the N-type female four-hole flange.

[0017] Preferably, the cross-sectional size of the insulating isolation buckle is 35mm * 35mm, the length is 10mm, and there is an aperture with a diameter of 6mm in the middle for the solid copper column to pass through.

[0018] Preferably, the cross-sectional size of the wire pressing device is 35mm * 35mm, the length is 30mm, has an opening and closing structure, and is fixedly connected to the insulating isolation buckle by screws. Its interior is designed with a square hole and a fastening mechanism for inserting the low-voltage connecting wire of the object to be measured.

[0019] Preferably, it includes the above-mentioned low-voltage adapter and a metal shielding cover. The metal shielding cover covers the outside of the low-voltage adapter and has a good electrical connection with the shielding layer of the high-voltage connection wire of the object to be measured, so as to improve the electromagnetic shielding performance.

[0020] Preferably, the cross-sectional size of the metal shielding cover is 85mm * 85mm, and the length is 90mm. It adopts a U-shaped metal cover closing design, with a metal lid on the top and is fixedly connected by screws. A spring contact is installed in the middle of the metal lid to ensure good electrical contact with the high-voltage shielding wire.

[0021] The beneficial technical effects of the present utility model are as follows: Regarding the details such as the equipment layout and connection method in measuring the high-low voltage coupling attenuation of unenergized high-voltage components using a vector network analyzer currently, they are not clear. By designing a set of innovative high-low voltage adapters, its significant advantages not only lie in being able to strictly meet the grounding requirements specified by the standard, ensuring an extremely low and stable and reliable grounding resistance, thereby effectively reducing electromagnetic interference and signal attenuation, and significantly improving the consistency and accuracy of test data. More importantly, it has excellent adaptability. Through a carefully designed connection structure and a flexible adjustment mechanism, this adapter can easily handle samples of different specifications and sizes, and can achieve precise docking, ensuring wide adaptability of the test, and can provide solid data support for subsequent product research and development and quality control. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the left and right side structures of an embodiment of the low-voltage adapter for high-low voltage coupling measurement of the present utility model;

[0023] Figure 2 It is a schematic diagram of the front and back side structures of an embodiment of the low-voltage adapter for high-low voltage coupling measurement of the present utility model;

[0024] Figure 3 It is a schematic diagram of the structure of an embodiment of the high-voltage adapter for high-low voltage coupling measurement of the present utility model.

[0025] Reference Numerals: 1, L-shaped grounding plate; 2, N-type female four-hole flange; 3, solid copper column; 4, insulating isolation buckle; 5, wire pressing device; 6, low-voltage adapter; 7, metal shielding cover. Detailed Embodiments

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0027] The present invention relates to a low-voltage and high-voltage adapter for high / low-voltage coupling measurement of new energy vehicle components, aiming to solve the electromagnetic compatibility problem of high / low-voltage coupling during the R & D stage of new energy vehicles. The low-voltage adapter 6 is composed of an L-shaped grounding plate 1, an N-type female head four-hole flange 2, a solid copper column 3, an insulating isolation buckle 4 and a wire pressing device 5, realizing efficient and stable signal transmission and good grounding effect. The high-voltage adapter adds a metal shielding cover 7 on the basis of the low-voltage adapter 6 to further improve the electromagnetic shielding performance and ensure the accuracy and stability of the test. This adapter can adapt to high-voltage components of different manufacturers, products and specifications, significantly reduce the electromagnetic compatibility risk, improve the consistency of test data, and help manufacturers control the production cycle and reduce costs. The present invention lies in its strict grounding design, flexible adaptation ability and efficient electromagnetic shielding performance, providing strong support for the R & D and quality control of new energy vehicle components.

[0028] Embodiment 1:

[0029] The embodiment of the present invention discloses a low-voltage adapter 6 for high / low-voltage coupling measurement, which includes:

[0030] An L-shaped grounding plate 1, which is a metal plate with a horizontal part and a vertical part. The horizontal part is used to maintain a good grounding connection with the test table, and the vertical part is used to install each component of the low-voltage adapter 6;

[0031] An N-type female head four-hole flange 2, which is installed on the vertical part of the L-shaped grounding plate 1 by means of threaded connection and flange fixation. One end is a radio frequency port, and the other end is a core wire part, which is used to connect a vector network analyzer and a solid copper column 3;

[0032] A solid copper column 3, made of pure copper, with one end connected to the core wire part of the N-type female head four-hole flange 2 and the other end connected to the wire pressing device 5;

[0033] An insulating isolation buckle 4, made of nylon plastic, which is used to isolate the N-type female head four-hole flange 2 and the wire pressing device 5, and fixes and connects the N-type female head four-hole flange 2, the L-shaped grounding plate 1 and the insulating isolation buckle 4 by screws;

[0034] A wire pressing device 5, made of solid pure copper, with an opening and closing structure, which is used to connect the low-voltage connecting wire of the object to be measured and is fixedly connected to the insulating isolation buckle 4 by screws.

[0035] Specifically, the horizontal part of the L-shaped ground plate 1 is provided with apertures of M6 or M8 in the middle, the side edge of the vertical part is provided with apertures of M6 or M8, and the middle of the vertical part is provided with apertures for fixing and installing the N-type female four-hole flange and passing through the RF core wire. The specification of the N-type female four-hole flange 2 is 25mm * 25mm, one end is an N-type female head adapted to the port of a vector network analyzer with a frequency as low as 150 kHz, and the other end is the core wire part. The length of the solid copper column 3 is 15mm and the diameter is 6mm, and it is welded to the core wire part of the N-type female four-hole flange 2. The cross-sectional dimension of the insulating isolation buckle 4 is 35mm * 35mm, the length is 10mm, and a hole with a diameter of 6mm is opened in the middle for the solid copper column 3 to pass through. The cross-sectional dimension of the wire pressing device 5 is 35mm * 35mm, the length is 30mm, it has an opening and closing structure, and is fixedly connected to the insulating isolation buckle 4 by screws. The inside is designed with a square hole and a fastening mechanism for inserting the low-voltage connecting wire of the object to be measured.

[0036] See Figure 1 and Figure 2 , the device of the low-voltage adapter 6 for high-low voltage coupling measurement disclosed in this embodiment includes an L-shaped ground plate 1, an N-type female four-hole flange 2, a solid copper column 3, an insulating isolation buckle 4 and a wire pressing device 5.

[0037] The L-shaped ground plate 1 is a metal plate, which is used for maintaining a good grounding connection with the test table in the horizontal direction and for installing each component of the low-voltage adapter 6 in the vertical direction;

[0038] A preferred embodiment is that the width of the L-shaped ground plate 1 is 140mm, the length in the horizontal direction is 94mm, and the length in the vertical direction is 140mm.

[0039] Another preferred embodiment is that an aperture of M6 or M8 is opened in the middle of the horizontal part of the L-shaped ground plate 1 for making a good grounding connection with the test table.

[0040] Another preferred embodiment is that two apertures of M6 or M8 are opened at the side edge of the vertical part of the L-shaped ground plate 1 for fixing the copper braid grounding strap, which can be used to ensure a good grounding connection during the test of special specification samples.

[0041] Another preferred embodiment is that five appropriate apertures are opened in the middle of the vertical part of the L-shaped ground plate 1, four of which are used for fixing and installing the N-type female four-hole flange, and the hole in the exact middle is for passing through the RF core wire.

[0042] The N-type female four-hole flange 2 ensures the stability and durability of the connection through threaded connection and flange fixation. Even in a vibrating or harsh environment, a stable connection state can be maintained. The N-type female head is used to connect to a vector network analyzer, and the other end is used to connect to a solid copper column 3.

[0043] A preferred embodiment is that the N-type female four-hole flange 2 has a specification of 25mm * 25mm. One end is a radio frequency port (N-type female head), which can conveniently adapt to the port of a vector network analyzer with a frequency as low as 150kHz; the other end is the core wire part.

[0044] The solid copper column 3 is made of pure copper and is used to connect the core wire part of the N-type female four-hole flange 2 and the wire pressing device 5.

[0045] A preferred embodiment is that the solid copper column 3 has a length of 15mm and a diameter of 6mm.

[0046] Another preferred embodiment is that the solid copper column 3 needs to be welded to the core wire of the four-hole flange to ensure good electrical conductivity, and at the same time, the insulation between the solid copper column 3 and the four-hole flange plate needs to be ensured.

[0047] The insulation isolation buckle 4 is made of nylon plastic and is used to isolate the N-type female four-hole flange 2 and the wire pressing device 5.

[0048] A preferred embodiment is that the cross-sectional size of the insulation isolation buckle 4 is 35mm * 35mm, and the N-type female four-hole flange 2, the L-shaped grounding plate 1, and the insulation isolation buckle 4 can be fixedly connected by 4 screws.

[0049] Another preferred embodiment is that the insulation isolation buckle 4 has a length of 10mm and a hole with a diameter of 6mm in the middle, which is convenient for the solid copper column 3 to pass through.

[0050] The wire pressing device 5 is made of solid pure copper and is used to connect the low-voltage connecting wire of the object to be measured.

[0051] A preferred embodiment is that the wire pressing device 5 is a copper structure with a cross-sectional size of 35mm * 35mm and a length of 30mm.

[0052] Another preferred embodiment is that the wire pressing device 5 can be fixedly connected to the insulation isolation buckle 4 by 4 long screws at the four corners of the cross-section of the wire pressing device 5.

[0053] Another preferred embodiment is that the copper structure of the wire pressing device 5 is horizontally cut from the middle of the cross-section. The length of the cut part is 22mm and it is divided into upper and lower parts. An alloy hinge is installed on the side of the two cut copper blocks to connect the two parts together, and it can be opened and closed by 180°.

[0054] Another preferred embodiment is as follows: A 6-mm aperture is opened in the middle of the 8-mm copper cross-section at the rear end of the lower copper structure of the wire pressing device 5 where it is not cut, into which the solid copper column 3 can be inserted. A threaded aperture is opened on the upper side of the 8-mm copper cross-section, and the copper structure and the solid copper column 3 can be fixedly connected by a long screw to ensure good electrical connection.

[0055] Another preferred embodiment is as follows: A square hole with a side length of 5 mm is opened in the middle of the cross-section of the copper structure at the cut part of the wire pressing device 5, which can be used to insert a relatively thick low-voltage connecting wire of the object to be measured.

[0056] Another preferred embodiment is as follows: A long metal bolt is installed on the opposite side of the alloy hinge of the copper structure wire pressing device 5. The top of the bolt is fixed to the side of the lower copper structure and can be opened and closed laterally by 180°. There is a protruding U-shaped structure on the side of the upper copper structure, and the bolt can be stuck into the U-shaped groove. The bolt can be tightened by rotating a butterfly-shaped nut to ensure good electrical connection between the wire pressing device 5 and the low-voltage connecting wire of the object to be measured.

[0057] Embodiment 2:

[0058] This embodiment discloses a high-voltage adapter for high-low voltage coupling measurement, which includes the low-voltage adapter 6 described in Embodiment 1 and a metal shielding cover 7. The metal shielding cover 7 covers the outside of the low-voltage adapter 6 and has good electrical connection with the shielding layer of the high-voltage connecting wire of the object to be measured to improve the electromagnetic shielding performance.

[0059] The cross-sectional size of the metal shielding cover 7 is 85 mm * 85 mm, and the length is 90 mm. It adopts a U-shaped metal cover closing design, with a metal lid on the top and is fixedly connected by screws. A spring contact is installed in the middle of the metal lid to ensure good electrical contact with the high-voltage shielding wire.

[0060] See Figure 3 , the device of the high-voltage adapter for high-low voltage coupling measurement disclosed in this embodiment includes a low-voltage adapter 6 and a metal shielding cover 7.

[0061] The low-voltage adapter 6 is the main structure of the high-voltage adapter and is used to connect the vector network analyzer and the high-voltage connecting wire of the object to be measured.

[0062] A preferred embodiment is as follows: The compatibility consideration of the high-voltage adapter has been incorporated into the design of the low-voltage adapter 6 at the initial stage. Through elaborate structural design, it is ensured that the low-voltage adapter 6 can not only meet its own functional requirements but also reserve the potential for seamless docking with the high-voltage adapter, thus achieving high structural generality and integrated consideration in design and research and development between the two.

[0063] The metal shielding cover 7 is the shielding structure of the high-voltage adapter, which is used to shield the low-voltage adapter 6 and has a good electrical connection with the shielding layer of the high-voltage connecting wire of the object under test.

[0064] A preferred embodiment is that the cross-sectional dimension of the metal shielding cover 7 is 85mm * 85mm and the length is 90mm.

[0065] Another preferred embodiment is that on the vertical part of the L-shaped grounding plate 1, centered on the N-type female head four-hole flange 2, a square groove with a height of 10mm and a side length of 85mm is welded. This groove is used for connection with other parts of the shielding cover and, as part of the shielding cover, improves the overall shielding effect.

[0066] Another preferred embodiment is that for the cavity part of the metal shielding cover 7, after closing two U-shaped metal covers, it can be tightly wrapped outside the square groove, with a cross-sectional dimension of 85mm * 85mm and a length of 90mm.

[0067] Another preferred embodiment is that for the closed connection part of the two U-shaped metal covers of the metal shielding cover 7, a concave-convex fitting design should be adopted, aiming to achieve efficient electromagnetic shielding at the connection part. The concave part and the convex part are tightly fitted to form a seamless butt joint, effectively preventing the leakage of electromagnetic waves and ensuring that the electromagnetic shielding performance of the connection area meets the design requirements.

[0068] Another preferred embodiment is that the top of the metal shielding cover 7 is equipped with a metal lid, with a cross-sectional dimension of 85mm * 85mm. There is a square groove with a height of 10mm and a side length of 85mm at the edge part, forming a symmetrical structure with the bottom and can be embedded in the closed cavity part of the shielding cover to improve the overall shielding effect.

[0069] Another preferred embodiment is that on each of the two square grooves on both sides of the metal shielding cover 7, 4 threaded holes are opened, and corresponding holes are opened at the corresponding positions of the two U-shaped metal covers. The two parts can be fixedly connected by 4 screws to ensure a tight connection of the structure and improve the overall shielding effect.

[0070] Another preferred embodiment is that a round hole with a suitable size is opened in the middle of the metal lid on the top of the metal shielding cover 7, and a spring contact is installed. It may contain multiple spring pieces or elastic metal wires inside, which can undergo elastic deformation when inserting the high-voltage shielding wire to ensure good electrical contact with the shielding layer.

[0071] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used 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 recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A low voltage adapter for high and low voltage coupling measurement, characterized in that: include: An L-shaped grounding plate (1), the L-shaped grounding plate (1) being a metal plate having a horizontal portion and a vertical portion, the horizontal portion being used to maintain a grounding connection with the test tabletop; An N-type female four-hole flange (2) is installed on the vertical part of the L-shaped ground plate (1), one end of which is a radio frequency port and the other end is a core wire part, which is used to connect the vector network analyzer and the solid copper column (3); The solid copper column (3) has one end connected to the core wire portion of the N-type female four-hole flange (2) and the other end connected to the wire pressing device (5); An insulating isolating buckle (4) is used to isolate the N-type female four-hole flange (2) and the wire pressing device (5), and to fixedly connect the N-type female four-hole flange (2), the L-shaped grounding plate (1) and the insulating isolating buckle (4); The wire pressing device (5) has an opening and closing structure and is used to connect the low-voltage connecting wire of the object to be tested and to fix the insulating isolation buckle (4).

2. The low voltage adapter for high and low voltage coupling measurement according to claim 1, characterized in that: The insulating isolating buckle (4) is made of nylon plastic, the solid copper column (3) is made of pure copper, and the wire pressing device (5) is made of solid pure copper.

3. The low voltage adapter for high and low voltage coupling measurement according to claim 2, characterized in that: The N-type female four-hole flange (2) is installed on the vertical part of the L-shaped grounding plate (1) by means of threaded connection and flange fixing.

4. The low voltage adapter for high and low voltage coupling measurement according to any one of claims 1 to 3, characterized in that: The horizontal part of the L-shaped grounding plate (1) is provided with an M6 or M8 aperture in the middle, the side edge of the vertical part is provided with an M6 or M8 aperture, and the vertical part is provided with an aperture in the middle for fixing and installing a four-hole flange of an N-type female connector and passing a radio frequency core line.

5. The low voltage adapter for high and low voltage coupling measurement according to any one of claims 1 to 3, characterized in that: The specification of the N-type female four-hole flange (2) is 25mm*25mm, one end is an N-type female connector adapted to the port of a vector network analyzer with a frequency as low as 150kHz, and the other end is a core wire part.

6. The low voltage adapter for high and low voltage coupling measurement according to any one of claims 1 to 3, characterized in that: The solid copper column (3) has a length of 15 mm and a diameter of 6 mm, and is welded to the core wire portion of the N-type female four-hole flange (2).

7. The low voltage adapter for high and low voltage coupling measurement according to any one of claims 1 to 3, characterized in that: The insulating spacer buckle (4) has a cross-sectional size of 35 mm*35 mm and a length of 10 mm, and a hole with a diameter of 6 mm is opened in the middle for the solid copper column (3) to pass through.

8. The low voltage adapter for high and low voltage coupling measurement according to any one of claims 1 to 3, characterized in that: The cross-sectional dimensions of the wire pressing device (5) are 35 mm*35 mm, the length is 30 mm, it has an opening and closing structure, and is fixedly connected to the insulating isolation buckle (4) by screws, and is internally designed with a square hole and a fastening mechanism for inserting the low-voltage connecting wire of the object to be tested.

9. A high voltage adapter for high and low voltage coupling measurement, characterized in that: It comprises a low voltage adapter (6) as described in any one of claims 1 to 8, and a metal shielding cover (7), wherein the metal shielding cover (7) covers the outside of the low voltage adapter (6) and is electrically connected to the shielding layer of the high voltage connecting line of the object to be tested, so as to improve the electromagnetic shielding performance.

10. The high voltage adapter for high and low voltage coupling measurement according to claim 9, characterized in that: The metal shielding cover (7) has a cross-sectional size of 85 mm*85 mm and a length of 90 mm. It adopts a U-shaped metal cover closure design, is equipped with a metal cover on the top, and is fixedly connected by screws. A spring contact is installed in the middle of the metal cover to ensure electrical contact with the high-voltage shielding line.

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