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윤재학(J.H. Yoon),김성기(S.K. Kim),권영민(Y.M. Kwon) 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.6
Recently, the application of electrical and electronic (E/E) control system has been increased in the construction equipment. Thus, the risks caused by systemic failure and potential malfunction of the E/E control system should be considered in design process. The design methods according to the functional safety standards have been recommended to reduce these risks because they could not be removed only by the quality control. This paper described the functional safety design by using design & verification methods based on the development process of ISO 26262, ISO 13849 and ISO 15998. The support process for the functional safety was described by the standard for automobile (ISO 26262) including state-of-the-art methods. The functional safety design methods are expected to improve not only the functional safety but the quality and the reliability of the E/E control systems as well.
3레벨 인버터로 구동되는 유도전동기 직접토크제어의 낮은 스위칭 주파수에서의 토크 리플 저감법
이교범(K. B. Lee),송중호(J. H. Song),최익(I. Choy),유지윤(J Y. Yoo),정명길(M G. Jung),한기준(K. J. Han),윤재학(J. H. Yoon) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper presents a torque ripple reduction technique of direct torque control(DTC) for high power induction motors driven by 3-level Inverters with the inverter switching frequency limited around 0.5-1kHz level. It is noted that conventional DTC algorithms to reduce torque ripple are devised for applications with relatively high switching frequency above 2-3kHz. A new DTC algorithm, especially 'for low switching frequency inverter system, illustrates relatively reduced torque ripple characteristics. Simulation and experimental results show the effectiveness of the proposed control algorithm.
박건태(G.T.Park),윤재학(J.H.Yoon),정명길(M.K.Jung),김두식(D.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
IGBTs are widely used for the industrial inverters in the mid power range at low voltage (440V -660V) application. Advantageous features of the device are simple gate drive and high speed switching capability. Due to these advantages the application of IGBTs is enlarging into the high power application. However, to increase the power handling capacity at lower input voltage level, the current rating m each bridge arm must be enlarged. Therefore the parallel operation of IGBT devices is essentially needed.<br/> This paper describes the feasible parallel structures of the power circuit for the IT\1d & the high power inverters and introduces the important design condition for the parallel operation of IGBT devices.<br/> To verify feasibility of the IGBT parallel operation, the feature of several IGBT devices (EUPEC, SEMIKRON's IGBT) are investigated and the power stacks are implemented and tested with these devices. The experimental results show the good characteristics for the parallel operation of IGBTs.