High efficiency regulation method for a zero-current and zero-voltage current-fed push-pull converter
Josť M. Blanes, A. Garrigos, Josť A. Carrasco, J.B. Ejea, E. Sanchis
IEEE TRANSACTIONS ON POWER ELECTRONICS  (2010)
Ed. IEEE Power Electronics Society  ISSN:0885-8993  - Vol. 26-2 pp. 444-452

Resumen:

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.