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This paper proposes a novel highly reliable single-stage buck-boost inverter. It can be operated as grid-connected and stand-alone inverter. In a single-stage, it can generate an output ac voltage higher and lower than the input dc voltage. The proposed inverter can be employed in grid-connected single-phase PV systems without injecting large dc current into the grid. In addition, it has no shoot-through...
This paper introduces a flyback converter utilizing a stepped air-gap transformer. By employing such a transformer, the converter efficiency can be noticeably improved in comparison to a conventional flyback converter. Measurements confirm a total loss reduction of up to 6.4 %.
Conventional soft switching techniques are promising for improvement of efficiency in full bridge converters. However, efficiency of converters with employing such techniques is restricted due to narrow range of zero voltage switching (ZVS). In such situation, several methods have been proposed in the literature to cope with wide range of ZVS from no load to maximum load. The extra circuitry added...
This paper discusses design issues of the high-frequency, four-leg interleaved DC/DC boost converter (6kW/650V ) that combines high efficiency with high power density. Low switching energies of the applied SiC MOSFETs and Schottky diodes offer operation at high switching frequency. Together with suitable phase-shift of the control signals this leads to input/output current frequency multiplication...
Aalborg Inverter is a grid-tied DC/AC inverter. In order to optimize the design, its power losses are analyzed in detail, combined with a description of the single-phase operating principle and the modulation strategy. A 2 kW / 220 V experimental prototype is constructed to verify the theoretical analysis. It is concluded that a minimize inductance in the power loop does help the inverter to achieve...
With the increasing pressure on modern power converters towards higher efficiency and smaller volume, power electronic specialists are now even more obliged to power converter optimization. In this study, the optimal design of an 800W, hard switched step down converter is targeted. Switching frequency (f) and inductance (L) are selected as parameters for optimization. Interleaving, a technique widely...
Silicon carbide (SiC) based devices are known to outperform Si devices in many aspects, such as lower power dissipation, higher operating temperatures, and higher switching frequencies. SiC devices will benefit hybrid vehicles when applied into the DC-DC converters and inverters as part of the electrical power conversion needed to drive the powertrain. Nevertheless, SiC devices can suffer from oscillations...
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