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In this paper, a modular multilevel power electronic transformer structure for power distribution system is discussed. The proposed structure consists of two completely decoupled power stages. Modular multilevel converter is adopted as the front-end ac-dc stage to convert the medium ac voltage to medium dc voltage, or vice versa. Galvanic isolation and voltage conversion are realized by the cascaded...
In this paper, a novel power electronic transformer (PET) structure for dc power distribution system is proposed. The proposed converter can achieve very high voltage conversion ratio with high frequency isolation and bidirectional energy flow, thus it can be used as the interface equipment of high voltage and low voltage dc power grid. Different from the conventional structure, only one high frequency...
This paper mainly discusses the influence of stray inductance on the switching performance of SiC MOSFET. For package with three leads, stray inductance at the source electrode is shared by the driving path and power path, which can reduce the switching speed and lead to increased power loss. A double pulse test bench is designed to verify the analysis. Based on the test bench, a direct bond copper...
To provide an interface equipment between medium voltage ac grid and low voltage dc grid, an innovative resonant power electronic transformer (PET) structure is proposed and analyzed in this paper. Only one high frequency transformer is used in the proposed converter. To achieve high voltage with low voltage device, modular multilevel structure is introduced as converter valve. The proposed converter...
In this paper, a quasi-resonant (QR) flyback dual-output LED driver with current-sharing transformer (CST) is analyzed thoroughly. Although the CST is utilized to balance the currents in two LED strings, from the theoretical analysis, it shows that the parasitic capacitance of CST and its magnetizing inductance have a significant effect on the output current deviation and diode's voltage stress. In...
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