Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-Inverters
This article addresses the challenges of the reduced efficiency in phase-shifted full-bridge series resonant converters (PSFB-SRCs) used within micro-inverters (MIs), especially under light load and high input voltage conditions. To enhance performance, first-order and second-order time-domain equiv...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/2/387 |
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| author | Geng Qin Hui Ma Jianhua Lei Chuantong Hao |
| author_facet | Geng Qin Hui Ma Jianhua Lei Chuantong Hao |
| author_sort | Geng Qin |
| collection | DOAJ |
| description | This article addresses the challenges of the reduced efficiency in phase-shifted full-bridge series resonant converters (PSFB-SRCs) used within micro-inverters (MIs), especially under light load and high input voltage conditions. To enhance performance, first-order and second-order time-domain equivalent models that accurately predict the output gain across a wide range of operating conditions are developed. A novel control strategy is proposed, featuring turn-on time as a feedback variable, with phase shift angle and dead time as feedforward variables, enabling precise computation of frequency, duty cycle, and phase shift time for digital controllers. This ensures optimal efficiency, stability, and dynamic response, regardless of the load conditions. Experimental results from the prototype confirmed zero-voltage switching under heavy loads and efficient frequency limiting under light loads, achieving a peak efficiency of 97.8% at a 25 V input. Notably, the light load efficiency remained above 90% even at a 50 V input. These contributions significantly advance PSFB-SRC technology, providing robust solutions for high-efficiency MI applications in photovoltaic systems. |
| format | Article |
| id | doaj-art-d61f969c51f0457886fa28d179c841dc |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-d61f969c51f0457886fa28d179c841dc2025-01-24T13:31:20ZengMDPI AGEnergies1996-10732025-01-0118238710.3390/en18020387Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-InvertersGeng Qin0Hui Ma1Jianhua Lei2Chuantong Hao3Institute of Renewable Energy, Shenzhen Poweroak Newener Co., Ltd., Shenzhen 518116, ChinaInstitute of Renewable Energy, Shenzhen Poweroak Newener Co., Ltd., Shenzhen 518116, ChinaInstitute of Renewable Energy, Shenzhen Poweroak Newener Co., Ltd., Shenzhen 518116, ChinaInstitute of Renewable Energy, Shenzhen Poweroak Newener Co., Ltd., Shenzhen 518116, ChinaThis article addresses the challenges of the reduced efficiency in phase-shifted full-bridge series resonant converters (PSFB-SRCs) used within micro-inverters (MIs), especially under light load and high input voltage conditions. To enhance performance, first-order and second-order time-domain equivalent models that accurately predict the output gain across a wide range of operating conditions are developed. A novel control strategy is proposed, featuring turn-on time as a feedback variable, with phase shift angle and dead time as feedforward variables, enabling precise computation of frequency, duty cycle, and phase shift time for digital controllers. This ensures optimal efficiency, stability, and dynamic response, regardless of the load conditions. Experimental results from the prototype confirmed zero-voltage switching under heavy loads and efficient frequency limiting under light loads, achieving a peak efficiency of 97.8% at a 25 V input. Notably, the light load efficiency remained above 90% even at a 50 V input. These contributions significantly advance PSFB-SRC technology, providing robust solutions for high-efficiency MI applications in photovoltaic systems.https://www.mdpi.com/1996-1073/18/2/387micro inverteradvanced control strategyphase-shift full bridgeseries resonant converter |
| spellingShingle | Geng Qin Hui Ma Jianhua Lei Chuantong Hao Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-Inverters Energies micro inverter advanced control strategy phase-shift full bridge series resonant converter |
| title | Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-Inverters |
| title_full | Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-Inverters |
| title_fullStr | Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-Inverters |
| title_full_unstemmed | Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-Inverters |
| title_short | Advanced Control Strategies for Enhancing the Performance of Phase-Shifted Full-Bridge Series Resonant DC–DC Converters in Photovoltaic Micro-Inverters |
| title_sort | advanced control strategies for enhancing the performance of phase shifted full bridge series resonant dc dc converters in photovoltaic micro inverters |
| topic | micro inverter advanced control strategy phase-shift full bridge series resonant converter |
| url | https://www.mdpi.com/1996-1073/18/2/387 |
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