한국철도학회:학술대회논문집 (Proceedings of the KSR Conference)
- 한국철도학회 2000년도 춘계학술대회 논문집
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- Pages.368-375
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- 2000
디지털 PLL을 이용한 ATS 지상자 코일 Q 측정장치 개발
Q Factor Measurement System for a ATS Coil Using Digital Phase Locked Loop
초록
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.
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