Abstract
A single-phase zero-voltage switching (ZVS) quasi-Z-source inverter with a high voltage gain is proposed, and important conclusions are obtained through the in-depth analysis of the key technologies, such as the topology, control strategy, high-frequency switching process, voltage transfer ratio, resonant processes, and ZVS condition, and the design criteria of key parameters. The inverter is composed of an impedance network with a high voltage gain, a ZVS auxiliary network, a single-phase inverter bridge, and an output <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> filter, adopting the unipolar SPWM control strategy with instantaneous feedback of output voltage and energy storage capacitor voltage. The impedance network is comprised of an energy storage inductor and two same diode–inductor–capacitor–capacitor cells; the ZVS auxiliary network includes a resonant inductor, a clamping capacitor, and an auxiliary switch, which provides the ZVS condition for power switches. The experimental results of a 1-kVA prototype verify that the proposed inverter features a high voltage gain, ZVS of all switches, high conversion efficiency, high output power quality, and strong load adaptability and has an important prospect in single-phase inversion with low input voltage or wide input voltage range.
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