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TY - CONF AU - Kim, M.J. AU - Choi, Choi. AU - Han, J.H. AU - Jeong, S.-H. AU - Jung, Y.G. AU - Kang, H.-S. AU - Kim, D.E. AU - Kim, M.S. AU - Lee, H.-G. AU - Lee, S.B. AU - Lee, S.J. AU - Oh, B.G. AU - Park, K.-H. AU - Suh, H.S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Design of Analog to Digital Converter Scheme for High - Precision Electromagnet Power supply J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - This paper deals with the design of an analogue-to-digital converter (ADC) scheme for a highly precise magnet current supply (MPS). The MPSs are requires with stable and precise current specification in range of the ppm. To meet the requirements, the AD circuit is composed of parallel ADCs of low-medium resolution. Digitally, the oversampling and averaging are performed to increase both the effective resolution and the signal to noise ratio (SNR). The implemented AD circuit was improved about 18 dB (32 times oversampling). The MPS applied by the proposed ADC scheme provides more precise control and the stable current within 10 ppm at 200 A. The experiment used a dipole magnet of the PAL-XFEL and its results proved feasibility through precisely measurable DVM3458A (Keysight Co.). PB - JACoW Publishing CP - Geneva, Switzerland SP - 1309 EP - 1311 KW - controls KW - FEL KW - hardware KW - experiment KW - dipole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPMP032 UR - http://jacow.org/ipac2019/papers/tupmp032.pdf ER -