The Effect of Guard on Improving the Resistance to Tracking Phenomenon for the PCB

초록

As the need for safe and eco-friendly transportation increases, the electronization of transportation sector is expected to increase explosively. This will lead to increase the use of printed circuit boards (PCBs). The PCBs used for transportation have a poor operating environment, but are required long-term reliability. Therefore, PCBs used in transportation are required to have strong resistance to tracking phenomenon from moisture or contamination. A basic sample was fabricated using a PCB and characteristics of tracking phenomenon were investigated. An improved sample with a guard installed on the basic sample was made, and the resistance to tracking phenomenon was measured experimentally. The function of the guard was investigated through thermal distribution analysis, electric field analysis, and current waveform measurement. By using the guard, the resistance to tracking phenomenon of the PCB increased by approximately 2.88 times. The guard changed the location of the dry band by conducting heat to the outside and retaining the electrolyte at the electrode tip. The strength of the discharge was weak, and the discharge appeared dispersed. As a result, the generation and growth of carbonization were delayed. The resistance to tracking phenomenon of the PCB used for transportation could be improved by using the guard. And the result of this study can be used as the basic knowledge necessary to implement this improvement in the PCBs.

키워드