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Galvanically isolated differential data transmission using capacitive coupling and a modified Manchester algorithm for smart power converters

: Niedermeier, M.T.; Wenger, M.M.; Filimon, R.; Sedlacek, V.O.; Lorentz, V.R.H.; Fort, C.; März, M.; Ferrieux, J.P.; Frey, L.

Postprint urn:nbn:de:0011-n-3243636 (1010 KByte PDF)
MD5 Fingerprint: a786d7055f97e9787e02e6dbe8f27554
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Erstellt am: 14.7.2018

Institute of Electrical and Electronics Engineers -IEEE-; IEEE Industrial Electronics Society -IES-:
IEEE 23rd International Symposium on Industrial Electronics, ISIE 2014. Proceedings. Vol.3 : Istanbul, Turkey, 1 - 4 June 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-2399-1
ISBN: 978-1-4799-2400-4
International Symposium on Industrial Electronics (ISIE) <23, 2014, Istanbul>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IISB ()

In this paper, a method for encoding and decoding digital data signals using a modified form of the standard Manchester code for the application in galvanically isolated data transmission in smart power electronics is described. The method includes a modified encoder circuit and a matching decoder circuit that is able to rebuild the original clock and data signal without a separate transmission of the clock signal. A capacitive coupling element with a corresponding signal conditioning circuit was placed between the encoder and decoder circuit to achieve a galvanic isolation between the primary side that processes the data signals and the secondary side that is responsible for the processing of power in smart power devices. After a description of basic principles of the transmission of data over a galvanic isolation and the state-of-the-art of Manchester code based data transmission, the encoding and decoding process of the modified Manchester code is elaborated and experimental results are presented.