Multi-objective design of single-phase differential buck inverters with active power decoupling

Rajamony, Rajesh, Wang, Sheng ORCID: https://orcid.org/0000-0002-2258-2633, Navaratne, Rukshan and Ming, Wenlong ORCID: https://orcid.org/0000-0003-1780-7292 2022. Multi-objective design of single-phase differential buck inverters with active power decoupling. IEEE Open Journal of Power Electronics 3 , pp. 105-114. 10.1109/OJPEL.2022.3147769

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Abstract

The design of single-phase differential buck inverters has two important considerations, including reducing seconder ripple power using decoupling capacitors and increasing inverter performances. Using larger capacitors will improve the performance of ripple power reduction while reducing the efficiency and power density. Such trade-off has not been fully modelled and investigated, leading to the sub-optimal design of inverters. To address that, in this paper, the trade-off between decoupling capacitances, inverter efficiency and power density are investigated through detailed mathematical modeling and sensitivity study. The trade-off of the volume and power loss of other essential components, including power switches, inductors and heatsinks, are also studied to facilitate the inverter design. A fast multi-objective design optimization method based on geometric programming is presented to optimize the inverters total efficiency and power density. A 1kW prototype of a Gallium Nitride (GaN) based inverter has been designed based on the presented method, aiming at an efficiency of 98.4% and power density 4.6kW/dm^3. The prototype has been tested to have an efficiency of 98.02% and power density 4.54kW/dm^3: This validates the accuracy and effectiveness of the presented design approach considering detailed trade-off analysis.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
ISSN:	2644-1314
Funders:	EPSRC
Date of First Compliant Deposit:	1 February 2022
Date of Acceptance:	22 January 2022
Last Modified:	18 May 2023 16:36
URI:	https://orca.cardiff.ac.uk/id/eprint/147101

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