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 29 for “"Conduction losses"”.
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A zero voltage switching boost converter using a soft switching auxiliary circuit with reduced conduction losses
… 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 auxiliary …
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A Variable-Structure Variable-Order Simulation Paradigm for Power Electronic Circuits
… 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. Conduction losses are …
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Multilevel Buck Converter Topologies and Their Applications
… voltage and load current reduce switching and conduction losses at the same time. A solution to free duty cycle limitation associated with series capacitor Buck converter to enable fast transient response is proposed. Experimental prototypes have been built and tested to validate the proposed …
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Characterization and control of a new high-torque motor for autonomous wearable robotics
… without reduction of mean torque or increased conduction losses relative to sinusoidal commutation.
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Novel zero-voltage switching techniques for pulse-width-modulated converters
… those in their PWM counterparts. Thus switching losses are significantly reduced at a slight increase in conduction losses. In addition, the circuit optimization is simplified because of constant-frequency operation. The operation principles of the proposed converters are described by using …
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Customisable Magnetic Components Using Nanocrystalline Flake Ribbon
… magnetic components with reduced losses, compact dimensions, lighter weight, and cost-effectiveness. Traditional methods for core customisation are cumbersome, time-consuming, and costly when producing small series of magnetic cores. Recently developed magnetic cores customised …
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Highly Efficient Gan-Based Single-Phase Transformer-Less Pv Grid-Tied Inverter
… carried out in terms of leakage current, power losses and efficiency.</p> <p>This dissertation also investigates the impact of emerging Gallium Nitride (GaN)-based power devices on a single-phase transformer-less inverter in terms of efficiency, high switching frequency capability, volume and …
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Comparative analysis of high input voltage and high voltage conversion ratio step-down converters equipped with silicon carbide and ultrafast silicon diodes
… battery chargers, are subject to high conduction losses, high switching losses and substantial reverse-recovery losses when minority carrier principle diodes are used. The recent introduction of silicon carbide diodes with high breakdown voltages has made possible the elimination of …
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Zero voltage switching flyback and forward converter topologies
… of the line and load conditions, no increase in conduction losses, simple power and control circuitry, and capability of operating in either voltage or current mode control. The small signal analysis and closed loop stability of the proposed topologies are also derived. The resulting compensation …
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Design and Fabrication of Inverter and Rectifier Modules for Indirect Matrix Converter Applications
… resistance. The SiC devices provide reduced conduction and switching losses. Due to the above mentioned advantages the power conversion efficiency of SiC devices is better compared to that of silicon (Si) devices.</p> <p>This thesis studies the implementation of 1200V/17A Normally-off SiC …
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Accelerated thermal degradation testing of GAN HEMTs under high-temperature stress
… switching speed, high breakdown voltage, and low conduction losses. Despite their advantages, GaN HEMTs are prone to performance degradation when exposed to elevated temperatures and electrical stress over long durations. This study aims to investigate the degradation behavior of commercial …
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Analysis and design of the modular multilevel converter for secure systems
… bypassing approaches are presented to reduce the conduction losses of the FB-SMs; therefore, the converter normal mode operation efficiency becomes similar to that of the conventional MMC. The T-MMC integrated with energy storage elements (ESEs) is studied, and it is found that the T-MMC based …
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Sealing of partially evacuated solar solar collectors
… torr of low thermal conductivity gas to suppress conduction losses from spurious gases arising in the collector.<br/><br/>A study was undertaken, and is shown, to predict the loss of vacuum in the polymer sealed collectors; for various vacuum sealing polymers. It is shown that viton is the most …
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Hybrid SC-Inductive Based Topologies for Low-volume High-efficiency Switched-mode Power Supplies
… outputs, these converters suffer from excessive losses and increased volume due to more demanding filtering and also cooling requirements. Therefore strong and ever increasing demands for developing smaller and more efficient SMPS with high conversion ratios exist.In this work two new converter …
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Design of dual-input two phase dc/dc converter with modified pulse width modulation (mpwm)
… reduced and it has the benefit of a reduction in conduction losses. In addition, Zero-Voltage Switching (ZVS) technique is also employed in the proposed converter to reduce the switching loss. The proposed converter circuit is simulated by using MATLAB/Simulink and PSpice software programs. The …
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Development of a Novel Multiport Power Converter for Inductive Power Transfer Applications
… than the input voltage, thus reducing switch conduction losses, as well as the ability to regulate its output voltage with minimal control action, resulting in a further reduction is switch conduction losses and a larger Zero Volt Switching (ZVS) region. The experimental results obtained from …
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High Frequency, High Current Integrated Magnetics Design and Analysis
… as the frequency increases from high switching losses. Resonant or soft switching topologies can provide a relief from the high switching loss for high frequency power conversion. One disadvantage of the resonant schemes is the increased conduction losses produced by the circulating energy …
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DC-DC converter designs for medium and high voltage direct current systems
… are proposed and analysed in terms of switching losses and operation aspects. A design method to size converter components is proposed and validated. Soft-switching characteristics of the analysed DAB are found comparable to the case of a two-level DAB at the same ratings and conditions. A family …
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A dual-junction thermocouple probe for compensated temperature measurement in reacting flows
… of spatial separation of the thermocouples, conduction losses, and to poor response of the junctions due to their size and heat capacity. Best results were obtained when the thermocouples were exposed to a non-reacting jet of heated air. In this situation, the response amplitude of the …
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The Clustered Insulated Gate Bipolar Transistor (CIGBT) — from concept to manufacturing
… control over a thyristor action to achieve low conduction losses. A “Capacitive” turn-on mechanism ensures a smooth turn on of the device without any snap back in the IV characteristics. An embedded self clamping” feature ensures protection of the gate and cathode structures from high anode …
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