We have observed a phenomenon where the internal X capacitors of the input EMI filter experienced damage during operation. To solve the problem, we have analyzed the malfunction by identifying the characteristics and operating principles of EMI filter. Based on this analysis, we have derived improvement strategies and validated them through experiments. This paper help some people prevent the similar problem when developing the similar equipment and solve the similar problem of the similar equipment.

DC/DC switching power converters are commonly used to generate a regulated DC output voltage with high efficiency. The advanced DC/DC converter uses a PWM-IC with OP-Amp. (Operational Amplifier) to control a MOSFET (metal-oxide semiconductor field effect transistor), which is a switching component, efficiently. In this paper, it is shown that the electrical characteristics of OP-Amp. are affected by radiations of γ rays using 60Co for TID (Total Ionizing Dose) testing and 5 heavy ions for SEL (Single Event Latch-up) testing. TID testing on OP-Amp. is accomplished up to the total dose of 30 krad, and the cross section(㎠) versus LET(MeV/mg/㎠ ) in the OP-Amp. operation is evaluated SEL testing after implementation of the controller board.

논문에서는 전력용반도체 소자의 수명예측으로 기초적인 동작환경과 구동시간들을 기록하였다. 전력변환기의 제어기에 의하여 전력소자의 구동시간과 방렬기의 온도 등 동작환경을 누적하여 기록하고 이를 확인할 수 있도록 하므로써전력용 반도체소자는 그 구조에서 수명은 반도체 칩의 온도변화의 크기와 반복회수로 사용기간을 보증하고 있으므로이에 의한 수명의 예측으로 유지보수 또는 교체가 적절한 시점에서 이루어질 수 있다고 판단된다.