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The quasi-Z-source inverter (qZSI) features as the shoot-through capability and the ability to buck and boost voltage with a single-stage structure. However, the protection mechanism for the shoot-through current (STC) is essential because of the increased current stress on the switching devices. This paper presents a STC sensing method for the protection based on the combined currents. Both the STC...
Over-voltage and over-current of grid-connected inverters not only affect their grid-connected or isolated operation modes directly, but also relate to the safety of their components. Over-voltage and over-current of grid-connected inverters in non-fault conditions are investigated in this paper. The over-voltage on dc-link and the filter capacitor as well the over-current caused by inrush current...
A novel three-level phase-shift DC/DC converter with two series-connected transformers is proposed in this paper to meet the requirements for high step-down ratio and high input voltage applications. The three-level construction internally halves the voltage stress of the power switch compared with the traditional full-bridge topology, for which the low-voltage-rated MOSFETs are used to reduce the...
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