Suppression of Common Mode Noise Caused by Unbalanced Return Currents of Redundant Power Lines
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Abstract
Reliable and uninterrupted operation of military avionic systems is vital for ensuring flight safety and especially for mission critical situations. For this reason, redundant structures are established in almost all units used in avionic systems. Redundant power system architectures are widely used to provide redundancy and reliability against possible failures. In avionics systems, unbalanced return currents may occur due to factors such as unbalanced load distributions and different line impedances caused by the internal architecture of multiple redundant power systems. This situation may cause common-mode noise on avionics systems. MIL-STD-461 standard is used to determine acceptable noise levels in terms of electromagnetic interference (EMI) in avionics systems. The CE102 test, which is part of this standard, is specifically applied to evaluate the common-mode components of conducted emissions in the frequency range from 10 kHz to 10 MHz. In this paper, the CE102 test is applied to the redundant power system of a military avionic control unit and a multi-input common-mode coil design is used to equalise the total current and noise levels of all redundant power system lines to reduce the common-mode noise to acceptable levels under MIL STD-461 emission limits in the 10 kHz - 10 MHz frequency band. The experimental results of this optimisation study are presented.
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