Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage Application
In this paper, a hybrid control method with adaptive phase-shifting modulation (PSM) and pulse-frequency modulation (PFM) is proposed to optimize the steady-state performance of an LLC resonant converter in wide voltage-gain range application. For the primary-side switches under the hybrid control m...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/17/7/1555 |
| _version_ | 1797212619130535936 |
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| author | Hongxun Jiang Xiumei Yue |
| author_facet | Hongxun Jiang Xiumei Yue |
| author_sort | Hongxun Jiang |
| collection | DOAJ |
| description | In this paper, a hybrid control method with adaptive phase-shifting modulation (PSM) and pulse-frequency modulation (PFM) is proposed to optimize the steady-state performance of an LLC resonant converter in wide voltage-gain range application. For the primary-side switches under the hybrid control method, zero-voltage switching (ZVS) performance is maintained over wide voltage-gain range and the turn-off loss is reduced; therefore, the converter reconciles wide voltage-gain range and high efficiency. Mode characteristics under different phase-shifting-angle-θ and switching-frequency-fs combinations is analyzed, and then the soft-switching characteristic is revealed. By introducing time domain analysis, the turn-on current of the primary-side switches is calculated, and thus the ZVS boundary of different θ and fs combinations is inferred. In addition, to acquire the optimum steady-state operation of the converter, the turn-off current is calculated; by making the converter work near to the minimum turn-off current operating point, the turn-off loss can be reduced greatly. With the principles of achieving ZVS performance and minimizing turn-off current, the phase-shifting angle θ of PSM is designed to be adaptive to the reference output voltage, no additional circuits are needed, and the two control degrees (θ and <i>f</i><sub>s</sub>) are simplified to one (<i>f</i><sub>s</sub>). The simulation and experiment are developed to verify the feasibility and effectiveness of the hybrid control method; the results show that ZVS performance is maintained at wide voltage-gain range and the turn-off current of the hybrid control method is reduced to that of the single PFM, and thus the turn-off loss is reduced. The efficiency comparison validates the fact that the hybrid control method has less power loss than single PSM and single PFM. |
| first_indexed | 2024-04-24T10:45:15Z |
| format | Article |
| id | doaj.art-27c9844b61d24ce1a4f3ef993758e682 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-24T10:45:15Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-27c9844b61d24ce1a4f3ef993758e6822024-04-12T13:17:43ZengMDPI AGEnergies1996-10732024-03-01177155510.3390/en17071555Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage ApplicationHongxun Jiang0Xiumei Yue1Sichuan Electromechanical Institute of Vocation and Technology, Panzhihua 617000, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha 410082, ChinaIn this paper, a hybrid control method with adaptive phase-shifting modulation (PSM) and pulse-frequency modulation (PFM) is proposed to optimize the steady-state performance of an LLC resonant converter in wide voltage-gain range application. For the primary-side switches under the hybrid control method, zero-voltage switching (ZVS) performance is maintained over wide voltage-gain range and the turn-off loss is reduced; therefore, the converter reconciles wide voltage-gain range and high efficiency. Mode characteristics under different phase-shifting-angle-θ and switching-frequency-fs combinations is analyzed, and then the soft-switching characteristic is revealed. By introducing time domain analysis, the turn-on current of the primary-side switches is calculated, and thus the ZVS boundary of different θ and fs combinations is inferred. In addition, to acquire the optimum steady-state operation of the converter, the turn-off current is calculated; by making the converter work near to the minimum turn-off current operating point, the turn-off loss can be reduced greatly. With the principles of achieving ZVS performance and minimizing turn-off current, the phase-shifting angle θ of PSM is designed to be adaptive to the reference output voltage, no additional circuits are needed, and the two control degrees (θ and <i>f</i><sub>s</sub>) are simplified to one (<i>f</i><sub>s</sub>). The simulation and experiment are developed to verify the feasibility and effectiveness of the hybrid control method; the results show that ZVS performance is maintained at wide voltage-gain range and the turn-off current of the hybrid control method is reduced to that of the single PFM, and thus the turn-off loss is reduced. The efficiency comparison validates the fact that the hybrid control method has less power loss than single PSM and single PFM.https://www.mdpi.com/1996-1073/17/7/1555LLC resonant converterwide voltage gainhybrid controlsoft-switching performanceturn-off loss |
| spellingShingle | Hongxun Jiang Xiumei Yue Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage Application Energies LLC resonant converter wide voltage gain hybrid control soft-switching performance turn-off loss |
| title | Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage Application |
| title_full | Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage Application |
| title_fullStr | Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage Application |
| title_full_unstemmed | Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage Application |
| title_short | Phase-Shifting Adaptive LLC Resonant Converter with Reduced Turn-Off Loss in Wide Voltage Application |
| title_sort | phase shifting adaptive llc resonant converter with reduced turn off loss in wide voltage application |
| topic | LLC resonant converter wide voltage gain hybrid control soft-switching performance turn-off loss |
| url | https://www.mdpi.com/1996-1073/17/7/1555 |
| work_keys_str_mv | AT hongxunjiang phaseshiftingadaptivellcresonantconverterwithreducedturnofflossinwidevoltageapplication AT xiumeiyue phaseshiftingadaptivellcresonantconverterwithreducedturnofflossinwidevoltageapplication |