A new filter for suppressing electromagnetic interference of power supply

Abstract

This utility model relates to a novel filter for suppressing electromagnetic interference in power supplies, comprising a housing, two copper busbars integrated with a heat sink on each busbar, the heat sink being mounted on a heat dissipation through-hole in the housing, a step at the edge of the heat dissipation through-hole, a positioning plate on the step, and a positioning hole in the center of the positioning plate matching the shape of the heat sink; the edge of the positioning plate is mounted on the step, and the heat sink is embedded in the positioning hole; the positioning plate and copper busbar are potted and cured with adhesive inside the housing; the housing has a fixing platform with a fixing screw hole at the edge of the heat dissipation through-hole. The beneficial effects of this utility model are: using the positioning plate to position and seal the large gap between the heat sink and the heat dissipation through-hole can prevent adhesive from seeping out of the housing surface during potting and curing, affecting the heat dissipation connection, thereby increasing the bonding stability between the heat sink surface and the aluminum shell, and ensuring good heat dissipation.

Description

Technical Field

[0001] This utility model relates to a filter, particularly for suppressing electromagnetic interference from power supplies. Background Technology

[0002] To prevent vehicle malfunctions, electronic components in electric vehicles have extremely high anti-interference requirements. Filters are a common type of anti-interference electronic component and are widely used in electric vehicles.

[0003] In the electric drive powertrain of new energy vehicles, the motor controller uses power modules such as IGBTs to regulate and drive the motor. The high operating frequency of the power modules necessitates the use of filtering devices to perform electromagnetic filtering within a specific frequency range, ensuring good electromagnetic compatibility (EMC) performance of the electric drive system. With the continuous development of electric vehicles, the requirements for EMC performance are increasingly stringent. Current filtering devices mainly consist of current-carrying copper busbars, magnetic rings, capacitors, printed circuit boards, and injection-molded housings. In these devices, the plastic housing results in poor heat dissipation efficiency. Existing powertrain filters (model 202421709423.6) have been improved by incorporating heat sinks on the copper busbars and mounted on the housing for auxiliary heat dissipation. During operation, the heat sinks are connected to the controller's aluminum housing for filter cooling. However, these vehicles are prone to vibration during use, leading to poor heat conduction between the heat sinks and the aluminum housing. Furthermore, during the potting process, adhesive overflows from the sides of the heat sink, forming clumps or leaving gaps, resulting in an uneven surface after potting. Utility Model Content

[0004] To overcome the shortcomings of current filter heat sinks with uneven surfaces, this utility model provides a novel filter for suppressing power supply electromagnetic interference.

[0005] The technical solution of this utility model to solve its technical problem is as follows: a novel filter for suppressing electromagnetic interference of power supply, comprising a housing, wherein two copper busbars are provided in the housing, and a spacer is provided between the two copper busbars; a heat sink is integrally provided on the copper busbars, and the heat sink is installed on a heat dissipation through hole on the housing; the copper busbars are electrically connected to three sets of capacitors, and the copper busbars pass through a first ring filter inductor and a second ring filter inductor; a step is provided at the edge of the heat dissipation through hole, and a positioning piece is provided on the step; a positioning hole with a shape matching the heat sink is provided in the middle of the positioning piece; the edge of the positioning piece is installed on the step and the heat sink is embedded in the positioning hole; the positioning piece and the copper busbars are potted and cured with glue inside the housing; a fixing platform with fixing screw holes is provided at the edge of the heat dissipation through hole on the housing.

[0006] To enhance the screw strength of the fixing platform, a metal insert is provided in the fixing platform, and the fixing screw hole is located on the metal insert.

[0007] Further preferably, at least three fixed platforms are provided.

[0008] To facilitate positioning, the positioning piece is provided with positioning ribs, and the step is provided with positioning grooves, with the positioning ribs engaging in the positioning grooves.

[0009] To enhance the snap-fit ​​positioning strength of the positioning piece, one positioning rib is provided at the top of each positioning piece, and one is provided at each of the left and right ends; the positioning groove is consistent with the position and number of the positioning rib.

[0010] To reduce installation and production difficulty, the partition is L-shaped and integrally injection molded. Previously, the partition was made by assembling two pieces, which was more troublesome to produce and install.

[0011] To improve filtering capability, the second ring filter inductor is an iron-based nanocrystalline inductor.

[0012] To reduce the amount of adhesive overflow during injection, one edge of the positioning hole is beveled to match the bent end of the heat sink.

[0013] Furthermore, the positioning piece is a positioning piece made of PPS material.

[0014] Furthermore, the potting compound inside the outer shell is made of polyurethane or silicone.

[0015] When using this utility model, the filter needs to be installed in the vehicle powertrain. The heat sink needs to be attached to the aluminum shell, and then the surface of the heat sink is firmly fixed to the inside of the aluminum shell by screw connection and fixing platform to complete the heat conduction connection of the heat sink.

[0016] The beneficial effects of this utility model are as follows: 1. The positioning plate is used to position and seal the large gap between the heat sink and the heat dissipation through hole, which can prevent the glue from seeping out of the shell surface during potting curing and affecting the heat dissipation connection. In addition, the positioning plate is provided with positioning ribs on the top cover, and the heat dissipation through hole is provided with a step with positioning groove, which can be positioned quite precisely, improving the installation accuracy of the heat sink, thereby increasing the bonding stability between the heat sink surface and the aluminum shell and ensuring good heat dissipation. 2. A set of fixing platforms is also provided at the outer end of the heat sink, so that the aluminum shell can be fixed to the fixing platform by fixing screws to complete the fixation. This avoids the vibration of the vehicle during use, which would create a gap between the heat sink and the aluminum shell and affect heat dissipation, further improving the heat dissipation stability. 3. The second ring filter inductor adopts a nanocrystalline inductor. Nanocrystalline materials have good temperature stability, and their magnetic properties are less affected by temperature changes. During vehicle operation, the electrical system generates a lot of heat, causing the ambient temperature to rise. The performance of ordinary inductors may fluctuate greatly due to temperature changes, while nanocrystalline inductors can maintain stable performance over a wide temperature range, ensuring that the filter can work reliably under different temperature conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Figure 2 This is an exploded view of the present invention.

[0019] Figure 3 This is a partially enlarged schematic diagram of the heat dissipation structure of this utility model.

[0020] Figure 4 This is an exploded view of the spacer of this utility model.

[0021] Figure 5 This is a cross-sectional schematic diagram of the heat dissipation structure of this utility model. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] Example 1 Combined with appendix Figures 1 to 5 A novel filter for suppressing electromagnetic interference in power supplies includes a housing 1, with two copper busbars 2 inside the housing 1 and a spacer 3 between the two copper busbars 2. A heat sink 4 is integrally mounted on each copper busbar 2 and is installed on a heat dissipation through-hole 5 on the housing 1. The copper busbars 2 are electrically connected to three sets of capacitor banks 6 and pass through a first annular filter inductor 7 and a second annular filter inductor 8. A step 9 is provided at the edge of the heat dissipation through-hole 5, and a positioning piece 10 is also provided on the step 9. The positioning piece 10 has a positioning hole 11 in the center that matches the shape of the heat sink 4. The edge of the positioning piece is mounted on the step 9, and the heat sink 4 is embedded in the positioning hole 11. The positioning piece 10 and the copper busbars 2 are potted and cured with adhesive inside the housing 1. A fixing platform 12 with fixing screw holes is provided at the edge of the heat dissipation through-hole on the housing 1.

[0024] To enhance the screw strength of the fixing platform 12, a metal insert 13 is provided in the fixing platform 12, and the fixing screw hole is located on the metal insert 13.

[0025] More preferably, at least three fixed platforms 12 are provided.

[0026] For easy positioning, the positioning piece 10 is provided with a positioning rib 14, and the step 9 is provided with a positioning groove 15, and the positioning rib 14 is inserted into the positioning groove 15.

[0027] To enhance the snap-fit ​​positioning strength of the positioning piece 10, one positioning rib 14 is provided at the upper end of the positioning piece 10 and one at each of the left and right ends; the positioning groove 15 is in the same position and number as the positioning rib 14.

[0028] To reduce installation and production difficulty, the partition 3 is L-shaped and integrally injection molded. Previously, the partition 3 was made of two pieces that were then assembled, which was more troublesome to produce and install.

[0029] To improve filtering capability, the second ring filter inductor 8 is an iron-based nanocrystalline inductor.

[0030] To reduce the amount of adhesive overflow during injection, one edge of the positioning hole 11 is beveled to match the bent end of the heat sink 4.

[0031] Furthermore, the positioning piece 10 is a positioning piece 10 made of PPS material.

[0032] Furthermore, the potting compound inside the outer shell 1 is polyurethane or silicone.

[0033] When using this utility model, the filter needs to be installed in the vehicle powertrain. The heat sink 4 needs to be attached to the aluminum shell, and then the surface of the heat sink 4 is firmly fixed to the inside of the aluminum shell by screw connection fixing platform 12 to complete the heat conduction connection of the heat sink 4.

[0034] The beneficial effects of this utility model are as follows: 1. The positioning plate is used to position and seal the large gap between the heat sink and the heat dissipation through hole, which can prevent the glue from seeping out of the shell surface during potting curing and affecting the heat dissipation connection. In addition, the positioning plate is provided with positioning ribs on the top cover, and the heat dissipation through hole is provided with a step with positioning groove, which can be positioned quite precisely, improving the installation accuracy of the heat sink, thereby increasing the bonding stability between the heat sink surface and the aluminum shell and ensuring good heat dissipation. 2. A set of fixing platforms is also provided at the outer end of the heat sink, so that the aluminum shell can be fixed to the fixing platform by fixing screws to complete the fixation. This avoids the vibration of the vehicle during use, which would create a gap between the heat sink and the aluminum shell and affect heat dissipation, further improving the heat dissipation stability. 3. The second ring filter inductor adopts a nanocrystalline inductor. Nanocrystalline materials have good temperature stability, and their magnetic properties are less affected by temperature changes. During vehicle operation, the electrical system generates a lot of heat, causing the ambient temperature to rise. The performance of ordinary inductors may fluctuate greatly due to temperature changes, while nanocrystalline inductors can maintain stable performance over a wide temperature range, ensuring that the filter can work reliably under different temperature conditions.

Claims

1. A novel filter for suppressing electromagnetic interference in power supplies, comprising a housing, wherein two copper busbars are disposed within the housing, and a spacer is disposed between the two copper busbars; a heat sink is integrally disposed on each copper busbar, the heat sink being mounted on a heat dissipation through-hole on the housing; the copper busbars are electrically connected to three sets of capacitor banks, and the copper busbars pass through a first ring filter inductor and a second ring filter inductor; characterized in that: The heat dissipation through hole has a step at its edge, and a positioning piece is provided on the step. The positioning piece has a positioning hole in the middle that matches the shape of the heat sink. The edge of the positioning piece is installed on the step and the heat sink is embedded in the positioning hole. The positioning piece and copper busbar are potted and cured inside the housing. The housing has a fixing platform with fixing screw holes at the edge of the heat dissipation through hole.

2. The novel filter for suppressing electromagnetic interference in power supplies according to claim 1, characterized in that: The fixing platform is provided with a metal insert, and the fixing screw hole is located on the metal insert.

3. The novel filter for suppressing electromagnetic interference in power supplies according to claim 2, characterized in that: There are at least three fixed platforms.

4. The novel filter for suppressing electromagnetic interference in power supplies according to claim 1, characterized in that: The positioning piece is provided with a positioning rib, and the step is provided with a positioning groove, and the positioning rib is inserted into the positioning groove.

5. The novel filter for suppressing electromagnetic interference in power supplies according to claim 4, characterized in that: One positioning rib is provided at the top of the positioning piece, and one is provided at each of the left and right ends; the positioning groove is consistent with the position and number of the positioning rib.

6. The novel filter for suppressing electromagnetic interference in power supplies according to claim 1, characterized in that: The partition is L-shaped and is integrally injection molded.

7. The novel filter for suppressing electromagnetic interference in power supplies according to claim 1, characterized in that: The second ring filter inductor is an iron-based nanocrystalline inductor.

8. The novel filter for suppressing electromagnetic interference in power supplies according to claim 1, characterized in that: One edge of the positioning hole is beveled to fit the bent end of the heat sink.

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