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A capacitor voltage balancing method for a three phase modular multilevel DC-DC converter (MMDC) is proposed in the paper. The MMDC is derived from a three phase DAB and a modular multilevel converter (MMC) and inherits desirable features of both topologies. To guarantee stable operation of the MMDC, submodule (SM) capacitor voltages are required to be balanced. The proposed balancing method is to...
Voltage Balance of the series-connected dc-link capacitors is the key problem of three-level diode-clamped converters. In this paper, an auxiliary voltage balance circuit (VBC) is presented to maintain the voltage balance of dc-link capacitors. The voltage balance circuit consists of a clamping capacitor and a current-limiting inductor. With the clamping capacitor, the voltage stresses of the auxiliary...
A high step-up switched-capacitor based converter is proposed in this paper. The proposed converter features high conversion ratio, low voltage stress and continuous input current, which makes it very suitable for renewable energy applications like photovoltaic systems. More importantly, the proposed switched-capacitor cells in series with converter can be generalized in two ways, resulting in dc-dc...
Flyback type converters are widely used in various applications including small power LED drivers. However, they suffer from the losses from the snubber circuit. To beat this problem, previous studies investigated the lossless snubbers. However, they still have a limitation due to the additional components resulting in a high cost and low power density. In this paper, a new converter topology for...
This paper presents a simple passive voltage balancing circuit for a modular DC/DC step-up converter for medium voltage (MV) DC grid in wind energy systems. The proposed auxiliary circuit is able to balance the capacitor voltages over a wide range of operating points. Regarding the converter, high frequency step-up resonant circuits with high gain rectifier modules are combined to form a modular step-up...
This paper presents a comparative study between a conventional boosted-VSI electric/hybrid electric vehicle (EV/HEV) powertrain converter with alternative topologies including bidirectional CSI, Silicon (Si)-based current-fed Quasi Z-Source Inverter (CF-qZSI), and Silicon Carbide (SiC)-based CF-qZSI. The higher switching frequency operation of SiC MOSFETs enables the size reduction of reactive elements...
A current-fed soft-switching three-phase dc-dc converter suitable for high-power high-voltage-gain applications is presented in this paper. Proposed converter consists of constant-current-fed three-phase inverting bridge with reverse-blocking switches, primary-Y-connected three-phase transformer and voltage-doubler rectifier modules at the output. The rectifier modules are connected in series at the...
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