Show simple item record

dc.contributor.authorBorn, Rachael Graceen
dc.date.accessioned2016-12-07T09:00:59Zen
dc.date.available2016-12-07T09:00:59Zen
dc.date.issued2016-12-06en
dc.identifier.othervt_gsexam:9033en
dc.identifier.urihttp://hdl.handle.net/10919/73584en
dc.description.abstractPower density has become increasingly important for applications where weight and space are limited. Power density is a unique challenge requiring the latest transistor technology to push switching frequency to shrink passive filter size. Furthermore, while high efficiency is an important thermal handling strategy, it must be weighed against increases in component size. Google's Little Box Challenge shone light on these challenges in pushing the power density of a 2kW inverter. The rise in electric vehicle infrastructure and demand represents a unique application for power electronics: pushing the power handling capability and functionality of bi-directional, on-board electric vehicle chargers for faster charging while simultaneously shrinking them in size. New wide-bandgap (WBG) devices, combined with soft-switching, now allow inverters to shrink in size by pushing to higher switching frequencies while maintaining efficiency. Classic H-Bridge topologies have limited switching frequency due to hard switching. Soft switching allows inverters to operate at higher frequency while minimizing switching loss. Concurrently, interleaving can reduce current handling stress and conduction loss better than simply paralleling two transistors. A novel interleaved auxiliary resonant snubber for high-frequency soft-switching is introduced. The design of an auxiliary resonant snubber is discussed; this allows the main GaN MOSFETs to achieve zero voltage switching (ZVS). The auxiliary switches and SiC diodes achieve zero current switching (ZCS). This soft-switching strategy can be applied to any modulation scheme. Here, it is applied to an asymmetrical unipolar H-bridge with two high frequency legs interleaved. While soft-switching minimizes switching loss, conduction loss is simultaneously reduced for high-power applications by interleaving two high frequency legs. This topology is chosen for its conduction loss reduction and bi-directional capability.en
dc.format.mediumETDen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsoft-switchingen
dc.subjectinterleavingen
dc.subjectinverteren
dc.subjectDC-ACen
dc.subjectpower densityen
dc.titleSoft-Switching, Interleaved Inverter for High Density Applicationsen
dc.typeThesisen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.description.degreeMaster of Scienceen
thesis.degree.nameMaster of Scienceen
thesis.degree.levelmastersen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.disciplineElectrical Engineeringen
dc.contributor.committeechairLai, Jih-Shengen
dc.contributor.committeememberLi, Qiangen
dc.contributor.committeememberSable, Daniel M.en


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record