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Electromagnetic shielding sealing device of control circuit board

A technology for controlling circuit boards and electromagnetic shielding, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problems of increased cost and assembly process, failure to achieve shielding and sealing, and reduced reliability, so as to improve the effect of shielding and grounding, shielding and sealing Good effect, the effect of improving reliability

Inactive Publication Date: 2014-12-24
CHINA NORTH VEHICLE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Method 1, there will be a gap between the cable and the side wall opening of the metal casing, and a complete shielding seal cannot be achieved
[0008] Method 2, the cable is connected through the electrical connector at the opening on the side wall of the metal shell. An electrical connector that can be screwed to the metal shell must be used, and the electrical connector shell must be well grounded; not only increases the cost And the assembly process, and the cable is transferred through the electrical connector, the reliability is reduced; if the ground shielding is not handled well at the transfer point, it will have negative effects and be more susceptible to interference

Method used

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  • Electromagnetic shielding sealing device of control circuit board
  • Electromagnetic shielding sealing device of control circuit board
  • Electromagnetic shielding sealing device of control circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The side wall of the cuboid casing 1 welded by aluminum plate has a rectangular through hole 41 with a height of H and a length of L, and the surface of the casing 1 is treated with conductive oxidation Ct.Ocd, such as Figure 4 to Figure 5 As shown, the rectangular sealing gasket 411 corresponding to the rectangular through hole 41 with a height of h and a length of l, l=L-1.5±0.2mm, h=H-1.5±0.2mm, the thickness a of the rectangular sealing gasket 411 and the shell 1 The thickness of the side walls is equal.

[0044] The height of the extension of the rectangular gasket 411 is h'=h+10mm, the length l'=1+10mm, and the thickness b of the extension is 2mm.

[0045] Rectangular gasket 411 is made of conductive rubber by pressing film. The conductive rubber is silver-plated aluminum conductive rubber with a tensile strength of 2MPa, a breaking elongation of 100%, a hardness of 75 Shore, and a volume resistivity of 0.01ohm- cm.

[0046] In the contact surface between the r...

Embodiment 2

[0048] The side wall of the cuboid shell 1 made of aluminum alloy by casting has a circular through hole 42 with a diameter of D, and conducts conductive oxidation Ct.Ocd treatment on the surface of the shell 1, such as Figure 6 to Figure 7 As shown, the circular gasket 422 with a diameter d corresponding to the circular through hole 42 is d=D-1.5±0.2mm, and the thickness a of the circular gasket 422 is equal to the thickness of the side wall of the housing 1 .

[0049] The diameter d' of the extension of the circular sealing gasket 422 is d'=d+10mm, and the thickness b of the extension is 2mm.

[0050] The circular gasket 422 is made of conductive rubber through lamination. The conductive rubber is silver-plated aluminum conductive rubber with a tensile strength of 2.5 MPa, a breaking elongation of more than 100%, a hardness of 85 Shore, and a volume resistivity of less than 0.01. ohm-cm.

[0051] The metal wire shielding net 10 is embedded in the contact surface between th...

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PUM

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Abstract

The invention provides an electromagnetic shielding sealing device of a control circuit board. The electromagnetic shielding sealing device comprises a shell and through holes formed in the side wall of the shell, the shell which is made by metal is rectangular, the through holes are in one-to-one correspondence to control circuit board interfaces arranged in the shell, and cables penetrate the the through holes to be connected with the control circuit board interfaces; improvements include that a sealing cover and a sealing rubber mat are arranged between the round or rectangular through holes and the cables, and grooves are formed in the centers of the sealing cover and the sealing rubber mat along the penetrating direction of the cables. Compared with the prior art, the electromagnetic shielding sealing device has the advantages that non-disconnected-type shielding sealing of cabin-penetrating wall-penetrating cables can be realized, process complexity caused by the fact that an electric connector is used for through connection for cabin penetrating through disconnected cables is avoided, reliability of cabin-penetrating cables is improved, and product cost is lowered.

Description

technical field [0001] The invention relates to an electromagnetic shielding and sealing device, in particular to an electromagnetic shielding and sealing device for a control circuit board. Background technique [0002] The permanent magnet motor controller (hereinafter referred to as the controller) is mainly composed of the DSP main control circuit and the main power circuit. It sends control signals to the IGBT and other power switching elements of the main power circuit through the DSP main control circuit board to realize the control of the permanent magnet motor. digital control. The main power circuit is the executive circuit of the controller, and the core of the controller is the DSP main control circuit board. The main control circuit board calculates and processes signals such as voltage and current through software, and outputs control signals. The voltage, current and other input signals of the main control circuit board and the control output signal are weak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
Inventor 邢彦斌姜茹田德文高香香刘华源高鹏飞韩志平张健马亚青孙文欣张学铭
Owner CHINA NORTH VEHICLE RES INST
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