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접촉 ESD 보호를 위한 세라믹 캐패시터의 내압 및 용량 선정에 관한 연구
이재철(Jaechul Lee),한장원(Jangwon Han),김일구(Ealgoo Kim),임종석(Jongseok Lim),이진구(Genekoo Lee),박재홍(Jaehong Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In recent years, electrical reliability test specification including ESD(Electro-static Discharge) protection has been more strict as demand of automotive safety increases. A ceramic capacitor is generally used for ESD protection because of its low cost and stable performance. The capacity value and voltage rating are most important characteristics to implement an ESD protection circuit with a ceramic capacitor. Nevertheless, it has been designed based on experience of design engineer and experiments with trial and error method. In this paper, it provides proper capacity and voltage rating analysis to design protection circuit for various reliability requirements easily, and verify the result with an experiment. To do this, it analyze voltage characteristic of protection circuit with indefinite resistance load and capacitor using HBM(Human-Body Model). And we simulate the voltage and current with certain value using MATLAB, and it shows how to select the proper value of capacity and voltage rating. And it verifies its result based on the experiment result.
입력 전압과 온도 변화에 따른 차량용 전동기의 성능변화
고재두(Jaedoo Go),Daniel Andersson,Trinh Quy Ngoc,김창민(Changmin Kim),이진구(Genekoo Lee),박재홍(Jaehong Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In recent days, actuators in automotive industry such as power-steering, ABS(Anti-lock Braking System), transmission, clutch, and etc, which are dependent on hydraulic systems, have been replaced with electrical actuators. However the electrical motors happen to lose their performance due to voltage drop caused by load variation, wire extension, or temperature increase as they are located near to engine. Generally, motors running in normal temperature and standard voltage, can work without abnormal performance loss. However temperature which changes inductance of stator, coil resistance and magnetism in motors, disturbs their ideal driving. At lower temperature, environmental changes in inductance or magnetism rarely decrease the performance, but at higher temperature, they come to lower the performance of actuators. This paper presents the performance variation of actuators using BLDC in automotive environment and inspects minimum arrival time of target objects in different circumstance with various voltages and temperature by simulation.