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RSS FeedsEnergies, Vol. 12, Pages 3211: Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers (Energies)


21 august 2019 13:00:22

Energies, Vol. 12, Pages 3211: Flux-Balance Control for LLC Resonant Converters with Center-Tapped Transformers (Energies)

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. Digg Facebook Google StumbleUpon Twitter
32 viewsCategory: Biophysics, Biotechnology, Physics
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