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High-Efficiency Regulation Method for a Zero-Current and Zero-Voltage Current-Fed Push–Pull Converter

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5 Author(s)
Blanes, J.M. ; Mater. Sci. & Technol. Dept., Univ. Miguel Hernandez, Elche, Spain ; Garrigos, A. ; Carrasco, J.A. ; Ejea-Martí, J.
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A new high-efficiency regulation method for a zero-current and zero-voltage current-fed push-pull converter is presented. The method proposed is based on the use of a controlled transformer as a post-regulator, which adds or subtracts an additional voltage to the output filter of the converter. An auxiliary regulator, which only handles a percentage of the output power, controls this transformer, and therefore, results in much higher efficiency than a normal preregulator would have. The novelty of the presented converter is that regulation is achieved without affecting the zero-voltage and zero-current switching in any working conditions. Small- and large-signal models of the converter have been developed and a low-power prototype has been simulated and implemented. The good agreement, between the experimental simulations and theoretical results, validates the theoretical developments.

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Power Electronics, IEEE Transactions on  (Volume:26 ,  Issue: 2 )