Study and Implementation on Start-Up Control of Full-Bridge LLC Resonant Converter

Huang, You-Chun; Hsieh, Yao‐Ching; Lin, Yi‐Cheng; Chiu, Huang-Ren; Lin, Jing‐Yuan

doi:10.1109/itec-ap.2018.8433272

Cited by 10 publications

(1 citation statement)

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“…The half-bridge (HB) and full-bridge (FB) with the center-tapped transformer rectifier topologies shown in Figure 1 are the most commonly used topologies of the LLC resonant converter. Thanks to the center-tapped transformer, only two rectifying diodes are necessary at the secondary side [8][9][10][11]. Without the center-tap, it would be required to implement a full-wave rectifier.…”

Section: Introductionmentioning

confidence: 99%

Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers

Lin

Chen

2019

Energies

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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.

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Section: Introductionmentioning

confidence: 99%