Abstract
The performance of a three-phase electromagnetic interference filter will be degraded due to noise-mode conversions. This article reveals these conversions are mainly induced by the unbalanced parameters of the filter's components. Moreover, the pulsewidth modulation strategies worsen this problem further. In order to evaluate the conversion contaminations, the unbalanced capacitors cases are addressed in detail, and a criterion on capacitor tolerance is then proposed. Furthermore, the impact of differential-mode components on this criterion is also highlighted. Finally, a common-mode <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> filter is taken as an example to verify the proposed criterion, and the experimental results fit the prediction made by the criterion very well.
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