Abstract
To realise a soft-switching inverter with a simple structure, high-efficiency and low-voltage stress, a novel resonant DC-link three-phase soft-switching inverter and its load adaptive commutation control are proposed in this study. Without two bulk capacitors and coupled inductors in the commutation circuit, the analysis and calculation of the inverter are simplified. Main switches of the inverter can achieve zero-voltage zero-current turn-on and pseudo zero-voltage turn-off, and commutation switches can achieve pseudo zero-current turn-on and pseudo zero-voltage turn-off. In addition, compared with the fixed time control, the load adaptive commutation control can dynamically regulate the switching points of commutation switches in each switching period and improve the efficiency of the inverter and the DC-link voltage utilisation rate. The main switches and commutation switches have the same and fixed switching frequency, and the voltage stress of them is equal to the input DC voltage. The load adaptive commutation control, the soft-switching resonant process and the design method of inverter resonant parameters are analysed in this study. A 10 kW prototype is designed to verify the feasibility of the inverter.
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