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Photovoltaic (PV) inverters convert the DC current of solar generators into AC current and feed it into the grid. There are three basic inverter topologies: inverters with low frequency (50/60 Hz) transformer (LF), inverters with high frequency transformer (HF) and transformer-less inverters (TL). The European market is dominated by transformer-less types (80%), in Japan approx. 50% of the inverters...
In this paper the implementation and the performance of 1200 V / 30 A / 65 mOmega normally-off SiC-JFETs in photovoltaic inverters (PV-inverters) is shown and compared with Si-IGBTs. The JFETs' low switching energy and on-resistance lead to an improvement of efficiency and a reduction of costs and weight of PV-inverters.
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