Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter
A multilevel switched capacitor LLC-DC transformer (LLC-DCX) converter with an embedded filter is presented for a power module of solid-state transformers. The proposed converter is a hybrid converter composed of resonant switched capacitor converters (RSCCs) and a previously reported ripple-cancel...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2023-01-01
|
| Series: | IEEE Open Journal of Power Electronics |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10011554/ |
| _version_ | 1797902159012954112 |
|---|---|
| author | Shota Okutani Ryo Nishiyama Pin-Yu Huang Yuichi Kado |
| author_facet | Shota Okutani Ryo Nishiyama Pin-Yu Huang Yuichi Kado |
| author_sort | Shota Okutani |
| collection | DOAJ |
| description | A multilevel switched capacitor LLC-DC transformer (LLC-DCX) converter with an embedded filter is presented for a power module of solid-state transformers. The proposed converter is a hybrid converter composed of resonant switched capacitor converters (RSCCs) and a previously reported ripple-cancel converter. In contrast to the conventional SCC, which faces the issue of an inrush hard-charging current during switching transition, the proposed converter can be implemented using a soft-charging operation without additional inductors. Further, it inherits the advantages of the two converters, including load-independent soft switching, automatic voltage sharing, automatic current sharing, reduction of the current ripple, an embedded filter function, constant voltage gain, and flexible extensibility. This paper comprehensively analyzes these characteristics and the conditions for soft-charging operation. The design theory based on the analysis is also presented. We fabricated a prototype of the proposed converter with input and output voltages of 900 V and 150 V, respectively and the rated output power of 2 kW to demonstrate the validity of the analysis and design. |
| first_indexed | 2024-04-10T09:13:23Z |
| format | Article |
| id | doaj.art-9f76bc6d32be4d189162bc11d89c56fe |
| institution | Directory Open Access Journal |
| issn | 2644-1314 |
| language | English |
| last_indexed | 2024-04-10T09:13:23Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Power Electronics |
| spelling | doaj.art-9f76bc6d32be4d189162bc11d89c56fe2023-02-21T00:03:55ZengIEEEIEEE Open Journal of Power Electronics2644-13142023-01-014345110.1109/OJPEL.2023.323519510011554Multilevel Switched Capacitor LLC-DCX Converter With Embedded FilterShota Okutani0https://orcid.org/0000-0002-8514-178XRyo Nishiyama1Pin-Yu Huang2https://orcid.org/0000-0002-5613-8709Yuichi Kado3https://orcid.org/0000-0002-9093-6317Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, JapanGraduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, JapanGraduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, JapanGraduate School of Science and Technology, Kyoto Institute of Technology, Kyoto, JapanA multilevel switched capacitor LLC-DC transformer (LLC-DCX) converter with an embedded filter is presented for a power module of solid-state transformers. The proposed converter is a hybrid converter composed of resonant switched capacitor converters (RSCCs) and a previously reported ripple-cancel converter. In contrast to the conventional SCC, which faces the issue of an inrush hard-charging current during switching transition, the proposed converter can be implemented using a soft-charging operation without additional inductors. Further, it inherits the advantages of the two converters, including load-independent soft switching, automatic voltage sharing, automatic current sharing, reduction of the current ripple, an embedded filter function, constant voltage gain, and flexible extensibility. This paper comprehensively analyzes these characteristics and the conditions for soft-charging operation. The design theory based on the analysis is also presented. We fabricated a prototype of the proposed converter with input and output voltages of 900 V and 150 V, respectively and the rated output power of 2 kW to demonstrate the validity of the analysis and design.https://ieeexplore.ieee.org/document/10011554/LLC resonant converterswitched capacitorembedded filterhigh-voltage applicationsoft switchinghybrid converter |
| spellingShingle | Shota Okutani Ryo Nishiyama Pin-Yu Huang Yuichi Kado Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter IEEE Open Journal of Power Electronics LLC resonant converter switched capacitor embedded filter high-voltage application soft switching hybrid converter |
| title | Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter |
| title_full | Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter |
| title_fullStr | Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter |
| title_full_unstemmed | Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter |
| title_short | Multilevel Switched Capacitor LLC-DCX Converter With Embedded Filter |
| title_sort | multilevel switched capacitor llc dcx converter with embedded filter |
| topic | LLC resonant converter switched capacitor embedded filter high-voltage application soft switching hybrid converter |
| url | https://ieeexplore.ieee.org/document/10011554/ |
| work_keys_str_mv | AT shotaokutani multilevelswitchedcapacitorllcdcxconverterwithembeddedfilter AT ryonishiyama multilevelswitchedcapacitorllcdcxconverterwithembeddedfilter AT pinyuhuang multilevelswitchedcapacitorllcdcxconverterwithembeddedfilter AT yuichikado multilevelswitchedcapacitorllcdcxconverterwithembeddedfilter |