Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 80 for “"Switching losses"”.
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Power Cycling with Switching Losses
… deals with a method to additionally heat with switching losses in a classical power cycling test, as it is often used for power semiconductors.The fundamentals of testing, switching behavior, thermal and electrical characteristics of semiconductors are covered.The core of the work is the …
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Reduction of Switching Losses in IGBT Power Modules
Lo scopo di questo lavoro è quello di studiare diverse strategie di ottimizzazione per pilotare IGBT e proporre una nuova tecnica. In applicazioni di potenza una particolare attenzione deve essere posta per fenomeni come le perdite di commutazione , sovracorrenti in accensione e sovratensione allo …
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Design of zero-current switching DC-DC buck converter
This project presents a zero-current switching (ZCS) DC-DC buck converter design, simulation and application. The converter control uses with ZCS technique to decrease the switching losses. Comparing to conventional buck converter, resonant buck converter includes a resonant tank equipped with …
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Stress and loss analysis of quasi-resonant converters
… recently in the effort of increasing the switching frequency and reducing the switching losses. There are several merits and demerits of this class of converters. The most important aspects of this research are to assess the advantages and limitations of QRCs in terms of their device …
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A Variable-Structure Variable-Order Simulation Paradigm for Power Electronic Circuits
… necessitates the accurate prediction of switching transients and losses that, historically, have been categorized as conduction and switching losses. In the vast majority of analyses, the power semiconductors (diodes, transistors) are represented using simplified or empirical models. …
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Analysis and Comparison of Space Vector Modulation Schemes for Three-Leg and Four-Leg Voltage Source Inverters
… The analysis is performed with respect to a) switching losses, b) total harmonic distortion, c) peak-to-peak ripple in the line current and d) the ease of digital implementation. The analysis is performed over the entire range of modulation index and for varying load power factors (leading and …
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Experimental investigation of semiconductor losses in cryogenic DC-DC converters
… at temperatures down to 20 K. In particular hard switching, synchronous rectifier, zero-voltageswitching and multi-level circuit prototypes are examined, focusing on the losses in the semiconductor devices. The prototypes operated from 120 V and 500 V DC supplies at power levels up to 500 W using …
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A zero voltage switching boost converter using a soft switching auxiliary circuit with reduced conduction losses
… to reverse recovery of the boost diode and high switching losses caused by hard switching of the boost switch. Many variations of the original boost topology have been suggested to overcome these problems. The Zero Voltage Transition Boost converter is one such solution. In such a converter an …
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Low-Frequency Series Loaded Resonant Inverter Characterization
… inverter topologies exhibit zero current switching (ZCS); hence, eliminate switching losses leading to higher efficiencies in comparison to hard switched topologies.</p> <p>Resonant inverters suffer severe limitations mainly attributed to a load dependent resonant frequency. Recent …
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Design of a 405/430 kHz, 100 kW Transformer with Medium Voltage Insulation Sheets
… for their ability to operate at higher switching frequencies. High frequency (HF) operation enables soft switching which, when achieved, reduces switching losses via either zero voltage switching (ZVS) or zero current switching (ZCS) depending on the converter topology. In addition to …
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Design zero-voltage switching DC-DC buck converter
This report proposes an integrated, high switching frequency, zero-voltage-switching dc-dc buck converter for battery charger application. The design and analysis of dc�dc buck converter with integrated inductor is presented. The converter has been optimized to convert 12V input voltage to 5V at …
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A Soft-Switched Grid-Connected DC/AC Inverter with Low Current Ripple
… based on simple full-bridge circuits with hard switching. However, hard-switching imposes several difficulties on the performance of DC/AC inverters. Thus, increasing the efficiency and decreasing the switching losses of these inverters have been an active research area. In particular, …
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Design of LCL-filters for grid-connected voltage source inverters
… IEEE-519 harmonic limitations and the allowable switching losses or voltage drop across the entire filter. Based on the analysis, the thesis proposes an optimum operating point for an LCL-filter where the minimum inductance is realised to meet IEEE-519 harmonic current limitations for a given …
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A three-level buck converter to regulate a high-voltage DC-to-AC inverter
… Optimization is included for both magnetics and switching losses. A prototype of the three-level buck converter is shown to perform as expected and meet all specifications.
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Switching-Loss Measurement of Current and Advanced Switching Devices for Medium-Power Systems
… amount of loss. A considerable portion of these losses are due to the use of switching devices themselves. Device losses can be apportioned to conduction loss and switching loss. It is commonly known and practiced that conduction loss can be reduced by driving MOSFETs and IGBTs harder with gate …
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Controlling the Vienna rectifier using a simplified space vector pulse width modulation technique
… to reduce the computational burden, the switching losses and the Total-Harmonic-Distortion (THD). Furthermore, the robustness of this modulation technique is tested under various faults through a 70 kW MATLAB/Simulink model and the results are validated through 1.2 kW prototype. The …
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A zero-voltage switching technique for high frequency buck converter ICs
This thesis explores a zero-voltage switching (ZVS) method that can be used to decrease the frequency dependent losses in a buck converter. The specific application for this thesis was a buck converter IC with an input voltage of up to 42V. The method utilizes the addition of an auxiliary circuit …
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Novel zero-voltage switching techniques for pulse-width-modulated converters
Two new classes of soft switching pulse-width-modulated (PWM) converters, named zero-voltage-switched (ZVS) PWM converters and zero-voltage-transition (ZVT) PWM converters, are proposed. The proposed ZVS-PWM converters combine the merits of conventional PWM and ZVS-QRC techniques. They are capable …
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High-frequency quasi-resonant converter techniques
… techniques to reduce or eliminate the switching stresses and switching losses in switching-mode power conversion circuits are developed: the zero-current switching technique and the zero-voltage switching technique. Based on these two techniques two new families of quasi-resonant …
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Analysis of Inductor-Coupled Zero-Voltage-Transition Converters
… and high power-density. Although a higher switching frequency not only improves the quality of the converter output but also decreases the size of the converter, it increases switching losses and electromagnetic interference (EMI) noise. Since the soft-switching topologies reduce the …
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