CN215266942U - Protective cover for improving EMC shielding effect of low-voltage signal of electric automobile inverter - Google Patents
Protective cover for improving EMC shielding effect of low-voltage signal of electric automobile inverter Download PDFInfo
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- CN215266942U CN215266942U CN202121231277.7U CN202121231277U CN215266942U CN 215266942 U CN215266942 U CN 215266942U CN 202121231277 U CN202121231277 U CN 202121231277U CN 215266942 U CN215266942 U CN 215266942U
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- circuit board
- inverter
- low
- protective cover
- shielding effect
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- 230000000694 effects Effects 0.000 title claims abstract description 14
- 230000001681 protective effect Effects 0.000 title claims description 28
- 239000002184 metal Substances 0.000 claims abstract description 22
- 239000006260 foam Substances 0.000 claims description 3
- 239000006262 metallic foam Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 230000005855 radiation Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000001125 extrusion Methods 0.000 abstract 1
- 229920000742 Cotton Polymers 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Inverter Devices (AREA)
Abstract
The utility model discloses a promote electric automobile dc-to-ac converter low pressure signal EMC shielding effect's protection casing, including the protection casing, the protection casing include circuit board, conductive medium and shield cover, the shield cover on install the circuit board, the circuit board on the interval be fixed with a plurality of conductive medium, the protection casing install on inverter control circuit board, form control circuit board subassembly, wherein, shield cover in inverter low voltage connector top, control circuit board unit mount on the casing, conductive medium towards casing lateral wall, conductive medium receives the extrusion and pastes tightly with metal casing's lateral wall, conductive medium takes place deformation by the compression, forms reliable connection with casing lateral wall. The utility model discloses can reduce among the electricity system of driving the radiation interference of dc-to-ac converter high-voltage current signal to low pressure control signal, eliminate because the unusual problem of dc-to-ac converter control signal that the coupling of high-low pressure signal produced, with low costs, the reliability is high, and assembly manufacturability is excellent.
Description
Technical Field
The utility model relates to a protection casing especially relates to a promote electric automobile dc-to-ac converter low pressure signal EMC shielding effect's protection casing.
Background
With the increasing power performance of an electric driving system of an electric automobile, the EMC (electromagnetic compatibility) safety requirement of an inverter is increasingly stringent; meanwhile, due to the requirement of high power density of the inverter, the layout mode of the low-voltage connector is limited, and when the low-voltage connector is arranged near a high-voltage area, the low-voltage control signal is interfered by a high-voltage current signal, so that the inverter control signal is abnormal, and an EMC (electromagnetic compatibility) problem is generated. The prior inverter has low EMC performance requirement, low power density and flexible layout mode of the low-voltage connector, and the interference can be reduced by adjusting the position of the connector, so that no people pay attention to the problem.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a promote electric automobile inverter low pressure signal EMC shielding effect's protection casing can reduce among the electricity system inverter high voltage current signal to low pressure control signal's radiation interference, eliminates because the inverter control signal abnormal problem that the coupling of high low pressure signal produced.
The technical scheme is as follows: the utility model discloses a protective cover, protective cover include circuit board, conductive medium and shield cover, the shield cover on install the circuit board, the circuit board on the interval be fixed with a plurality of conductive media, the protective cover install on inverter control circuit board, form control circuit board subassembly, wherein, the shield cover in inverter low pressure connector top, control circuit board subassembly install on the casing, conductive medium towards the casing lateral wall.
The circuit board is a printed circuit board.
The conductive medium is an elastic conductive medium, and the elastic conductive medium is made of metal conductive foam.
The metal conductive foam is welded on the circuit board.
The circuit board is arranged on the shielding cover through a fastening screw.
The shielding cover adopts a metal shielding cover.
The control circuit board assembly is arranged on the shell through screws, so that the protective cover and the inverter main shell are reliably grounded, the radiation interference of high-voltage current signals to low-voltage control signals is effectively reduced, and the problem of inverter control signal abnormity caused by high-voltage and low-voltage signal coupling is solved.
The casing is a metal casing.
Has the advantages that: the utility model discloses can reduce among the electricity system of driving the radiation interference of dc-to-ac converter high-voltage current signal to low pressure control signal, eliminate because the unusual problem of dc-to-ac converter control signal that the coupling of high-low pressure signal produced, with low costs, the reliability is high, and assembly manufacturability is excellent.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the control circuit board assembly of the present invention;
FIG. 3 is a schematic view of the protective cover according to the present invention;
fig. 4 is a schematic diagram of the EMC shielding effectiveness simulation result of the protective cover of the present invention;
fig. 5 is the utility model discloses a protection casing EMC shields validity test result sketch.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 to 3, the utility model discloses a printed circuit board 1 and elasticity conductive medium, wherein, elasticity conductive medium adopts the cotton 2 of metal conductive bubble, and the interval welding has the cotton 2 of a plurality of metal conductive bubbles on the printed circuit board 1, and the printed circuit board 1 that will weld the cotton 2 of metal conductive bubble is in the same place through fastening screw 3 and the assembly of metal shield cover 4, forms protection casing 7.
As shown in fig. 2 and 3, the protection cover 7 is mounted on the inverter control circuit board 5, and the shield cover 4 of the protection cover 7 covers the inverter low-voltage connector 6, and the protection cover 7 is mounted on the inverter low-voltage connector 6 to form a control circuit board assembly integrated with the inverter control circuit board 5, as shown in fig. 2. This subassembly passes through screw 8 to be installed on metal casing 9 to make the cotton 2 of metal electrically conductive bubble face metal casing 9, as shown in fig. 3, the cotton 2 of metal electrically conductive bubble is pressed and is pasted tightly with the lateral wall of metal casing 9, the cotton 2 of metal electrically conductive bubble of elastic state is compressed and takes place deformation, form reliable connection with the casing lateral wall, this reliable connection is verified through the random vibration test of high strength, the cotton 2 of metal electrically conductive bubble is unworn after the test, no metal fillings drop, and can maintain lower contact resistance value, the EMC shielding effect is outstanding, the test result is as shown in fig. 4 and 5.
The EMC shielding effectiveness before and after the protective cover is added to the inverter low-voltage connector is subjected to simulation verification, as shown in FIG. 4, the protective cover is not arranged, the EMC performance of the inverter low-voltage signal conducted outside cannot meet the requirement (a relation curve of noise and frequency falls into an unqualified area), and after the protective cover is added, the EMC performance of the inverter low-voltage signal conducted outside can meet the requirement.
The EMC shielding effectiveness before and after the protective cover is added to the low-voltage connector of the inverter is tested and verified, as shown in FIG. 5, curves A and B respectively represent the relation curves of the conducted noise frequency and the conducted noise energy without the protective cover and after the protective cover is added, and C represents the limit line of the noise value. The electromagnetic compatibility requires that the noise conducted by the low-voltage signal to the outside is lower than the corresponding limit line in the corresponding noise value of each frequency band.
It can be seen that when no protective cover is provided, the low-voltage signal EMC (electromagnetic compatibility validity) emitted from the low-voltage connector is poor in performance, and the average value of the externally conducted noise exceeds the limit line at 6MHZ, so that the result is unqualified; after the protective cover is added, the EMC (electromagnetic compatibility effectiveness) performance of the low-voltage connector is obviously improved, the noise value conducted to the outside is obviously reduced, the noise value does not exceed the limit line, and the whole curve falls into a qualified area.
The fundamental reason is that the protective cover designed by the invention realizes effective grounding with the shell, on one hand, electromagnetic interference is introduced into the ground, on the other hand, the shielding function of the protective cover isolates high-voltage signals from low-voltage signals, thereby reducing the coupling of the high-voltage signals and the low-voltage signals and finally reducing the noise concentration in the low-voltage signals output by the inverter.
The utility model has excellent manufacturing process, and in the actual assembly production process, the protective cover 7 and the inverter control circuit board 5 are already pre-assembled into a whole; subsequent installation only needs to lock the components onto the metal casing 9 through the screws 8, and is very friendly to automatic production. By using the metal shielding cover 4, the printed circuit board 1 and the elastic conductive medium, the protective cover 7 is formed after assembly and is installed on the inverter low-voltage signal connector, so that the protective cover 7 and the inverter main shell are reliably grounded, the radiation interference of a high-voltage current signal to a low-voltage control signal is effectively reduced, and the problem of inverter control signal abnormity caused by high-voltage and low-voltage signal coupling is solved.
Claims (8)
1. The utility model provides a promote electric automobile inverter low pressure signal EMC shielding effect's protection casing, a serial communication port, including protection casing (7), protection casing (7) include circuit board, conducting medium and shield cover, the shield cover on install the circuit board, the circuit board on the interval be fixed with a plurality of conducting medium, protection casing (7) install on inverter control circuit board (5), form control circuit board subassembly, wherein, the shield cover in inverter low voltage connector (6) top, control circuit board subassembly install on the casing, conducting medium towards the casing lateral wall.
2. The protective cover for improving EMC shielding effect of low-voltage signals of an inverter of an electric vehicle as claimed in claim 1, wherein said circuit board is a printed circuit board (1).
3. The protective cover for improving the EMC shielding effect of the low-voltage signal of the inverter of the electric vehicle as claimed in claim 1, wherein the conductive medium is an elastic conductive medium, and the elastic conductive medium is made of metal conductive foam (2).
4. A protective cover for improving EMC shielding effect of low-voltage signals of an inverter of an electric vehicle as claimed in claim 3, wherein said metal foam (2) is soldered on the circuit board.
5. The shield for improving EMC shielding effect of low-voltage signals of an inverter of an electric vehicle as claimed in claim 1 or 2, wherein the circuit board is mounted on the shield by fastening screws (3).
6. The protective cover for improving the EMC shielding effect of the low-voltage signal of the inverter of the electric vehicle as claimed in claim 1, wherein the protective cover is a metal shielding cover (4).
7. The protective cover for improving EMC shielding effect of low-voltage signals of an inverter of an electric vehicle as claimed in claim 1, wherein said control circuit board assembly is mounted on the housing by screws (8).
8. The protective cover for improving EMC shielding effect of low-voltage signals of an inverter of an electric vehicle as claimed in claim 1 or 7, wherein said housing is a metal housing (9).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021210599560 | 2021-05-18 | ||
| CN202121059956 | 2021-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215266942U true CN215266942U (en) | 2021-12-21 |
Family
ID=79476201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121231277.7U Active CN215266942U (en) | 2021-05-18 | 2021-06-03 | Protective cover for improving EMC shielding effect of low-voltage signal of electric automobile inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215266942U (en) |
-
2021
- 2021-06-03 CN CN202121231277.7U patent/CN215266942U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 2 Gangcheng Road, Economic Development Zone, Nanjing City, Jiangsu Province, 210046 Patentee after: WEIRAN (NANJING) POWER TECHNOLOGY CO.,LTD. Country or region after: China Address before: No.2 Gangcheng Road, Longtan Town, Qixia District, Nanjing City, Jiangsu Province, 210046 Patentee before: WEIRAN (NANJING) POWER TECHNOLOGY CO.,LTD. Country or region before: China |
|
| CP03 | Change of name, title or address |