Abstract
This design is aimed at a 1140V medium voltage converter for mining industry, which can sample the high voltage DC bus voltage of the frequency converter by voltage reduction and A / D conversion optical fiber transmission. Because the DC bus voltage of frequency converter is high, which brings great danger to detection and maintenance, the DC sampling scheme greatly solves this problem, and highlights photoelectric isolation through appropriate circuit design. The problem of isolation between high voltage area and low voltage area of frequency converter is solved, and the accuracy of sampling and the safety of maintenance personnel are guaranteed.
Published Version
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