Research on Zero-Transition Single-Phase PFC Rectifier WITHOUT Auxiliary Switch

Y.-s. Li, Z.-z. Kan, Y. Wang, and C.-j. Zhang (PRC)


PFC; rectifier; softswitching; discontinuous current mode


A soft-switching single-phase power-factor-correction topology without auxiliary switch is proposed in the paper. The operating principle of the circuit is analyzed in discontinuous-conduction-mode. All the switching devices are able to turn on or off in zero-voltage transition(ZVT) or zero-current-transition(ZCT). This rectifier is controlled by one-cycle. Simulation and experiment results verify that soft-switching can be realized in whole input voltage range and has no relations with the load. Unity power factor can be attained.

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