Abstract
This article presents the analysis and management of differential mode conducted EMI in modular converters made from associations of standard conversion cells. Two main configurations, inputs in series—outputs in parallel and inputs in parallel—outputs in series are studied with the objective to define a generic EMI management technique, independent from the number of conversion standard cells implemented. First, analysis is carried out from a theoretical point of view based on simplified models. Second, filtering solutions are introduced and compared. Especially, centralized versus distributed filtering techniques are compared with the objective to find generic solutions. The results are compared and validated with practical characterizations.
Highlights
Since the 1990’s, modular converters based on Power Electronics Building Blocks (PEBB) are studied to simplify converter’s design and implementation [1,2]
Even if the EMC signature of each conversion cells (CSC) is addressed individually, ISOP (Inputs in Series – Outputs in Parallel) and/or IPOS (Inputs in Parallel – Outputs in Series) configurations modify the converter input impedance and produced disturbances. This paper investigates this issue with the aim to identify a simple and effective way to make invariant the signature of a modular converter, no matter the amount of conversion standard cells and the configuration in which they are implemented
We can at first make CSCs to comply with regulation standards and check how the compliance is affected by the numbers of cells implemented and the association type
Summary
Since the 1990’s, modular converters based on Power Electronics Building Blocks (PEBB) are studied to simplify converter’s design and implementation [1,2]. EMI signature and compliance are especially difficult to anticipate and require expertise, prototyping and very often tuning and reworks This is not very convenient for modular converter implementations based on PEBB where the users are looking for plug and play solutions, independent from the configuration used. Even if the EMC signature of each CSC is addressed individually, ISOP (Inputs in Series – Outputs in Parallel) and/or IPOS (Inputs in Parallel – Outputs in Series) configurations modify the converter input impedance and produced disturbances This paper investigates this issue with the aim to identify a simple and effective way to make invariant the signature of a modular converter, no matter the amount of conversion standard cells and the configuration in which they are implemented. The whole analysis and conclusions can be transferred to any type of elementary and standardized conversion cell as long as it is a voltage input converter such as an H bridge converter or any converter with a DC voltage bus at the input terminals
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