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디지털 PLL을 이용한 ATS 지상자 코일 Q 측정장치 개발
김기택(Kim Gi-Taek),임기택(Lim Kee-Taek),최정용(Choi Jung-Yong),김봉택(Kim Bong-Taek) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
For safety reason ATS(Automatic Train Stop) system is being used, which is a kind of communication system with a feedback amplifier and a transformer on the train and wayside coils. The coils are highly resonant LC circuits, also have very high Q(Quality) factors. The Q factors of wayside ATS coils are to be maintained high enough for the amplifier to operate reliably. In this paper a novel Q measurement system is proposed. The system measures the resonant frequency and the bandwidth of the ATS coils, by controlling the phase difference between the transformer and the coil using digital PLL(Phase Locked Loop). The overall configuration and algorithms of the proposed system and the digital PLL control schemes are presented in details. The experimental waveforms are shown to verify the system performances.
이미지 처리기술을 이용한 펜터그라프 섭판 측정장치 개발
김기택(Kim Gi-Taek),임기택(Lim Kee-Taek),김봉택(Kim Bong-Taek) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
Pentagraphs are used to supply electric power to train via trolley lines. The higher train speed is, the higher voltage and current levels are. Since electric power is supplied with slinding contact, localized abrasion is inevitable. It is difficult and dangerous to measure their shape manually. Measurement system of pentagraph slider with ultrasonic processing has been reported. In this paper, measurement system with image processing is proposed. The system consists of CCD cameras, image grabber board, and PC operated on Windows"95. Image processing algorithms are presented and some results are illustrated.