Analysis of surge breakdown of airborne electronic controller

Inhalt:
With the increasing degree of electrification on civil aircraft, a large number of airborne electronic equipment is used. In order to ensure that aircraft operation is in the expected environment and comply with airworthiness, electromagnetic environmental tests should be carried out in accordance with RTCA/DO-160. The failure of an electronic controller occurred many times on an certain aircraft type. In the investigation, it was found that the MOSFET in the electronic controller was broken down by the surge voltage generated directly by the electronic valve with the effect of coupling between cables. In this paper, the failure mechanism is analyzed by conducting different laboratory tests and tests on aircraft, and the relevant electromagnetic tests of the electronic controller are compared and analyzed. It is concluded that electromagnetic tests based on RTCA/DO-160 are difficult to cover the impact of surge voltage on electronic equipment, and relevant improvement suggestions are given.