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In order to simplify the configuration of photovoltaic (PV) grid-connection system, this paper proposes to adopt a buck-boost dc-dc converter, and then develops a single-phase inverter via the connection with an H-bridge unfolding circuit with line-commutated. Depending on the conditions of dc input-voltage and ac output-voltage, the proposed circuit can work functionally as either a step-down or...
A zero-voltage switching (ZVS) pulse-width-modulation (PWM) single-phase inverter using a ZVS transformer-isolated step-up/down dc link is presented in this paper. The proposed ZVS transformer-isolated step-up/down dc link not only makes the switches in single-phase inverter can operate at ZVS condition, but it has a step-up/down input voltage function and it provides an isolation function. Moreover,...
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