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Method for characterizing printed circuit board insulation life in salt spray environment

A printed circuit board, insulation life technology, applied in the field of electrified railway, to achieve the effect of ensuring safety

Active Publication Date: 2016-06-15
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a gap in characterizing the insulation life of printed circuit boards in salt spray environments. Therefore, in order to ensure the safety of EMU operation, it is necessary to carry out research on the method of characterizing the insulation life of printed circuit boards in salt spray environments.

Method used

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  • Method for characterizing printed circuit board insulation life in salt spray environment
  • Method for characterizing printed circuit board insulation life in salt spray environment
  • Method for characterizing printed circuit board insulation life in salt spray environment

Examples

Experimental program
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Embodiment 1

[0052] figure 1 It is a schematic flowchart of the method for characterizing the insulation life of a printed circuit board in a salt spray environment provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the method includes the following steps:

[0053] S11. Test the insulation characteristic parameter y of the printed circuit board under different accelerated salt spray aging times t:

[0054] In the embodiment of the present invention, the insulation characterization parameters used can be any or any number of insulation characterization parameters commonly used in the field. However, in order to more accurately characterize the insulation life of the printed circuit board in the salt spray environment, in the present invention In this example, the insulation characterization parameters are preferably insulation characterization parameters that are significantly affected by the aging of the printed circuit board, such as interlayer insulation resist...

Embodiment 2

[0098] As an example, the second embodiment is described by taking two insulation characteristic parameters as an example. Further, the two insulation characterization parameters are interlayer insulation resistance and impulse withstand voltage respectively.

[0099] Figure 6 It is a schematic flowchart of a method for characterizing the insulation life of a printed circuit board in a salt spray environment provided by Embodiment 2 of the present invention. Such as Figure 6 As shown, the method includes the following steps:

[0100] S61. Test the interlayer insulation resistance of printed circuit boards under different accelerated salt spray aging times t:

[0101] The interlayer insulation resistance R of the printed circuit boards under different accelerated salt spray aging times t was tested by using the method for testing the interlayer insulation resistance described in Embodiment 1.

[0102] S62. Test the impulse withstand voltage of printed circuit boards under...

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Abstract

The invention discloses a method for characterizing a printed circuit board insulation life in a salt spray environment, which includes the steps of: testing at least an insulating characterization parameter y of a printed circuit board in different acceleration salt spray ageing times t; obtaining a function relation formula Y(t) of the acceleration salt spray ageing times t and an insulation characterization parameter y through a data fitting method according to the different acceleration salt spray ageing times t and the corresponding insulation characterization parameter y; substituting an acceleration salt spray ageing empirical formula into the Y(t), and obtaining a function relation formula Y(L) of a real ageing time L and the insulation characterization parameter; calculating a first order derivative Y'(L) of Y(L); calculating the real ageing time L0 when Y'(L)=0; and taking the real ageing time L0 when Y'(L)=0 as the printed circuit board insulation life in the salt spray environment. According to the method, a running environment of multiple units is considered, and the blanks in the characterization of the printed circuit board insulation life in the salt spray environment are filled in. The method provides data support for timely overhauling of the multiple units, and guarantees the running safety of the multiple units.

Description

technical field [0001] The invention relates to the technical field of electrified railways, in particular to a method for characterizing the insulation life of a printed circuit board in a salt spray environment. Background technique [0002] EMUs use variable frequency traction motors as power sources, and use traction converters and traction transformers to provide appropriate operating voltage and current for the variable frequency motors. When the EMU starts and over-insulates joints, the overvoltage generated will be transmitted to the printed circuit board (hereinafter referred to as the printed circuit board) of the high-power module of the EMU, causing a flashover on the surface of the printed circuit board and accelerating the aging of the high-power module . [0003] Moreover, due to the large land area of ​​our country, the operating environment of high-speed EMUs is very different. In the vicinity of coastal or internal salt fields, the salt spray in the atmosp...

Claims

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Application Information

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IPC IPC(8): G01R31/28
CPCG01R31/2817
Inventor 杨盼奎徐磊马升潘周海军胡学永侯方东弓海斌由建宏
Owner CRRC QINGDAO SIFANG CO LTD