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Abstract-This paper proposes a new single-phase AC-DC conversion topology with inherent power ripple decoupling, based on the combination of a PWM H-bridge inverter, an AC side LC filter and a ZVS line commutated H-bridge. A capacitor on the AC side is used as power decoupling element. By appropriate selection of the capacitor voltage, the power ripple at twice the AC frequency can be cancelled from the DC side instantaneous power, achieving negligible DC voltage ripple using a smaller total capacitance compared to traditional solutions.Recently, several solutions using the concept of Ripple-Port have been proposed that reduce the overall capacitance. However, they usually need at least a dedicated PWM half-bridge leg, adding switching loss, and a separate LC tank. Instead, the proposed topology integrates the ripple compensation in the AC/DC conversion stage, exploiting the AC filter and minimising additional loss thanks to the ZVS of the additional H-bridge.The concept of the steady state operation of the proposed converter is described analytically and validated in simulation using MATLAB Simulink and PLECS.This work is being developed at University of Nottingham within the framework of project SENSIBLE.

A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract-This paper introduces a new single-phase AC-DC converter capable of achieving independent voltage control across a dedicated power decoupling capacitor, by exploiting the same full bridge that controls the grid current in combination with two bidirectional switches, soft commutated at the line frequency (ZVS). A suitable control of the capacitor voltage is used to completely decouple pulsating grid power from the DC-link, enabling the use of smaller film capacitors instead of electrolytic capacitors for power decoupling, improving reliability and increasing power density. This is achieved without additional high switching frequency devices. Furthermore, the interference occurring between rectified grid current and power decoupling capacitor current is exploited in order to reduce the RMS current in the full bridge, thus improving conversion efficiency.This work is being developed at University of Nottingham within the framework of project SENSIBLE.

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