- The unipolarsinusoidal pulse width modulation (SPWM) full-bridge transformer lessphotovoltaic inverter with ac Bypass brings low conduction loss and low leakage current.
- In order to better eliminate the leakage current induced by the common mode voltage, the clamping technology can be adopted to hold the common-mode voltage on a constant value in the freewheeling period.
- A full-bridge inverter topology with constant common-mode voltage (FB-CCV) has been derived and proposed in this article, two unidirectional freewheeling branches are added into the ac side of the FB-CCV, and the split structure of the proposed freewheeling branches does not lead itself to the reverse-recovery issues for the freewheeling power switches and as such super junction mosfets can be utilized without any efficiency penalty.
- The passive clamping branches consist of a capacitor divider and two Diodes, is added into the dc side of the FB-CCV, therefore, the Weakness of active damping branch has been overcome, and the Better clamping performance has been achieved in the freewheeling Period.
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