High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEV
In this article, a 12-switch non-isolated LLC (NI-LLC) converter is proposed to address the application requirements of 4:1 bidirectional fixed-ratio voltage conversion in 48 V mild hybrid electric vehicles (MHEVs). Compared with the previous NI-LLC converters, the proposed 12-switch NI-LLC converte...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
|
| Series: | IEEE Open Journal of Power Electronics |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10965339/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849310547814645760 |
|---|---|
| author | Song Ding Chunyan Nie Qi Liu Qinsong Qian Weifeng Sun |
| author_facet | Song Ding Chunyan Nie Qi Liu Qinsong Qian Weifeng Sun |
| author_sort | Song Ding |
| collection | DOAJ |
| description | In this article, a 12-switch non-isolated LLC (NI-LLC) converter is proposed to address the application requirements of 4:1 bidirectional fixed-ratio voltage conversion in 48 V mild hybrid electric vehicles (MHEVs). Compared with the previous NI-LLC converters, the proposed 12-switch NI-LLC converter has superior efficiency and enables inherent bidirectional operation without requiring energy flow direction detection or additional control schemes for forward and reverse modes. Additionally, to synchronously turn on and off power switches in the proposed converter and to reduce gate drive loss and layout area, a transformer-coupled resonant gate driver is proposed. This driver circuit consumes only 18.7% of the power of conventional gate drive circuits, thereby ensuring high efficiency and power density in the converter. Unlike conventional resonant gate driver, the proposed gate driver not only recovers the charge energy, but also significantly reduces the ON/OFF time of main switches. Finally, the proposed converter and gate driver is verified on a 1.2 MHz/960 W prototype with a power density up to 5.6 kW/inch<sup>3</sup>. The converter achieves a peak efficiency of 98.5%, and the full load efficiency at forward and reverse operation are 97.1% and 96.7% respectively. |
| format | Article |
| id | doaj-art-b419983ca3cb4fc9b52303166f69479f |
| institution | Kabale University |
| issn | 2644-1314 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Power Electronics |
| spelling | doaj-art-b419983ca3cb4fc9b52303166f69479f2025-08-20T03:53:42ZengIEEEIEEE Open Journal of Power Electronics2644-13142025-01-01674776010.1109/OJPEL.2025.356122110965339High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEVSong Ding0https://orcid.org/0000-0001-6527-2339Chunyan Nie1Qi Liu2https://orcid.org/0000-0001-5600-8069Qinsong Qian3https://orcid.org/0000-0002-1573-7342Weifeng Sun4https://orcid.org/0000-0002-3289-8877National ASIC System Engineering Research Center, Southeast University, Nanjing, ChinaNational ASIC System Engineering Research Center, Southeast University, Nanjing, ChinaNational ASIC System Engineering Research Center, Southeast University, Nanjing, ChinaNational ASIC System Engineering Research Center, Southeast University, Nanjing, ChinaNational ASIC System Engineering Research Center, Southeast University, Nanjing, ChinaIn this article, a 12-switch non-isolated LLC (NI-LLC) converter is proposed to address the application requirements of 4:1 bidirectional fixed-ratio voltage conversion in 48 V mild hybrid electric vehicles (MHEVs). Compared with the previous NI-LLC converters, the proposed 12-switch NI-LLC converter has superior efficiency and enables inherent bidirectional operation without requiring energy flow direction detection or additional control schemes for forward and reverse modes. Additionally, to synchronously turn on and off power switches in the proposed converter and to reduce gate drive loss and layout area, a transformer-coupled resonant gate driver is proposed. This driver circuit consumes only 18.7% of the power of conventional gate drive circuits, thereby ensuring high efficiency and power density in the converter. Unlike conventional resonant gate driver, the proposed gate driver not only recovers the charge energy, but also significantly reduces the ON/OFF time of main switches. Finally, the proposed converter and gate driver is verified on a 1.2 MHz/960 W prototype with a power density up to 5.6 kW/inch<sup>3</sup>. The converter achieves a peak efficiency of 98.5%, and the full load efficiency at forward and reverse operation are 97.1% and 96.7% respectively.https://ieeexplore.ieee.org/document/10965339/Bidirectional DC/DC convertertransformer-coupled gate driverhigh power density48 V MHEV |
| spellingShingle | Song Ding Chunyan Nie Qi Liu Qinsong Qian Weifeng Sun High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEV IEEE Open Journal of Power Electronics Bidirectional DC/DC converter transformer-coupled gate driver high power density 48 V MHEV |
| title | High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEV |
| title_full | High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEV |
| title_fullStr | High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEV |
| title_full_unstemmed | High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEV |
| title_short | High Efficiency High Power Density Bidirectional Non-Isolated LLC Converter With Transformer-Coupled Gate Driver for 48 V MHEV |
| title_sort | high efficiency high power density bidirectional non isolated llc converter with transformer coupled gate driver for 48 v mhev |
| topic | Bidirectional DC/DC converter transformer-coupled gate driver high power density 48 V MHEV |
| url | https://ieeexplore.ieee.org/document/10965339/ |
| work_keys_str_mv | AT songding highefficiencyhighpowerdensitybidirectionalnonisolatedllcconverterwithtransformercoupledgatedriverfor48vmhev AT chunyannie highefficiencyhighpowerdensitybidirectionalnonisolatedllcconverterwithtransformercoupledgatedriverfor48vmhev AT qiliu highefficiencyhighpowerdensitybidirectionalnonisolatedllcconverterwithtransformercoupledgatedriverfor48vmhev AT qinsongqian highefficiencyhighpowerdensitybidirectionalnonisolatedllcconverterwithtransformercoupledgatedriverfor48vmhev AT weifengsun highefficiencyhighpowerdensitybidirectionalnonisolatedllcconverterwithtransformercoupledgatedriverfor48vmhev |