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3 Poznan University of Technology Academic Journals. Electrical Engineering

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Conducted EMI performance comparison of Si and SiC MOSFETS in a CCM boost PFC converter for MIL-STD-461F CE102

Kavak H., Iskender I., Jahi A.

Poznan University of Technology Academic Journals. Electrical Engineering

2018

No. 95

87--94

This paper presents a comparison of conducted EMI performance of Si and SiC MOSFETs in a CCM PFC boost converter that is designed to meet CE102 of MIL-STD- 461F. EMI performance comparison is based on MOSFET of the PFC converter. That is, the power switch of the converter is the only parameter that is changed during tests. The boost diode is kept the same during the tests and the type of the boost diode is SiC. The paper shows the CE102 test results of Si and SiC MOSFETs without an EMI filter at the input side of CCM PFC boost converter.

A ZVT boost converter suitable for PV arrays

Genc N., Iskender I.

Poznan University of Technology Academic Journals. Electrical Engineering

2010

No. 61

225-234

This paper presents a novel zero voltage transition (ZVT) boost converter that can be used in the photovoltaic (PV) array sources to reduce the switching losses. The auxiliary circuit used in the proposed converter is implemented by using only one auxiliary switch and a minimum number of passive components without an important increase in the cost and complexity. The main advantage of the proposed converter is that it not only provides ZVT in the boost switch but also provides soft switching in the auxiliary switch. The proposed soft switched boost converter is analyzed theoretically. The theoretical analysis is verified via simulation and experimental studies. The experimental results are in very good agreement with the simulation results of the circuit.

Dynamic thermal modeling of top oil temperature rise for power transformers

Iskender I., Mamizadeh A.

Poznan University of Technology Academic Journals. Electrical Engineering

2009

No 60

103-114

Transformer life has a considerable economic impact on the operation of an electrical network. The most important parameter in transformers life expectancy is the insulation temperature value. The aim of this paper is to present a new and more accurate top-oil thermal model based on heat transfer theory, application of the lumped capacitance method, the thermal-electrical analogy and a new definition of nonlinear thermal resistances of oil immersed transformers. The model presented in this paper takes into account oil viscosity changes and loss variation with temperature. The changes in transformer time constants due to changes in he oil viscosity are also accounted for in the thermal model. The models are validated using experimental results, which have been obtained from a series of temperature rise tests performed on a range of oil immersed distribution transformers. The experimental results verify the model proposed in this study for oil immersed transformers.