Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers
LLC resonant converters with center-tapped transformers are widely used. However, these converters suffer from a flux walking issue, which causes a larger output ripple and possible transformer saturation. In this paper, a flux-balance control strategy is proposed for resolving the flux walking issu...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-08-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/12/17/3211 |
| _version_ | 1811185251608690688 |
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| author | Yuan-Chih Lin Ding-Tang Chen Ching-Jan Chen |
| author_facet | Yuan-Chih Lin Ding-Tang Chen Ching-Jan Chen |
| author_sort | Yuan-Chih Lin |
| collection | DOAJ |
| description | LLC resonant converters with center-tapped transformers are widely used. However, these converters suffer from a flux walking issue, which causes a larger output ripple and possible transformer saturation. In this paper, a flux-balance control strategy is proposed for resolving the flux walking issue. First, the DC magnetizing current generated due to the mismatched secondary-side leakage inductances, and its effects on the voltage gain are analyzed. From the analysis, the flux-balance control strategy, which is based on the original output-voltage control loop, is proposed. Since the DC magnetizing current is not easily measured, a current sensing strategy with a current estimator is proposed, which only requires one current sensor and is easy to estimate the DC magnetizing current. Finally, a simulation scheme and a hardware prototype with rated output power 200 W, input voltage 380 V, and output voltage 20 V is constructed for verification. The simulation and experimental results show that the proposed control strategy effectively reduces the DC magnetizing current and output voltage ripple at mismatched condition. |
| first_indexed | 2024-04-11T13:27:23Z |
| format | Article |
| id | doaj.art-fe236a2cedee4495b63f60fdc3af6895 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:27:23Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-fe236a2cedee4495b63f60fdc3af68952022-12-22T04:22:02ZengMDPI AGEnergies1996-10732019-08-011217321110.3390/en12173211en12173211Flux-Balance Control for LLC Resonant Converters with Center-Tapped TransformersYuan-Chih Lin0Ding-Tang Chen1Ching-Jan Chen2Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan; No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, TaiwanDepartment of Electrical Engineering, National Taiwan University, Taipei, Taiwan; No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, TaiwanDepartment of Electrical Engineering, National Taiwan University, Taipei, Taiwan; No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, TaiwanLLC resonant converters with center-tapped transformers are widely used. However, these converters suffer from a flux walking issue, which causes a larger output ripple and possible transformer saturation. In this paper, a flux-balance control strategy is proposed for resolving the flux walking issue. First, the DC magnetizing current generated due to the mismatched secondary-side leakage inductances, and its effects on the voltage gain are analyzed. From the analysis, the flux-balance control strategy, which is based on the original output-voltage control loop, is proposed. Since the DC magnetizing current is not easily measured, a current sensing strategy with a current estimator is proposed, which only requires one current sensor and is easy to estimate the DC magnetizing current. Finally, a simulation scheme and a hardware prototype with rated output power 200 W, input voltage 380 V, and output voltage 20 V is constructed for verification. The simulation and experimental results show that the proposed control strategy effectively reduces the DC magnetizing current and output voltage ripple at mismatched condition.https://www.mdpi.com/1996-1073/12/17/3211LLC resonant convertercenter-tapped transformerflux walkingflux-balance control loopmagnetizing current estimation |
| spellingShingle | Yuan-Chih Lin Ding-Tang Chen Ching-Jan Chen Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers Energies LLC resonant converter center-tapped transformer flux walking flux-balance control loop magnetizing current estimation |
| title | Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers |
| title_full | Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers |
| title_fullStr | Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers |
| title_full_unstemmed | Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers |
| title_short | Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers |
| title_sort | flux balance control for llc resonant converters with center tapped transformers |
| topic | LLC resonant converter center-tapped transformer flux walking flux-balance control loop magnetizing current estimation |
| url | https://www.mdpi.com/1996-1073/12/17/3211 |
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