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 62 for “"Switching Loss"”.
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Switching-Loss Measurement of Current and Advanced Switching Devices for Medium-Power Systems
… a usable power source with the lowest 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 …
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MOSFET Current Source Gate Drivers, Switching Loss Modeling and Frequency Dithering Control for MHz Switching Frequency DC-DC Converters
The power density of a switching converter is dependent on the size of the power circuit components. Converters are operated in the hundreds of kHz to achieve high power density since the size of the converter reactive components decrease as frequency increases. Most present day low power (<200W) …
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Improving Inverter Efficiency at Low Power Using a Reduced Switching Frequency
… must be kept low. In this thesis, the impact of switching frequency upon switching loss for a SPWM inverter is investigated. Results, from mathematical modeling, simulation and experimental implementation, show the same trend that reducing the switching frequency reduces switching loss at low …
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Evaluation of Voltage-Controlled Active Gate-Drivers for SiC MOSFET Power Semiconductors
… come a host of advantages, including higher switching frequency, improved thermal performance, and higher voltage rating. This higher switching frequency can reduce the size of the con- verter system, but is typically associated with higher dv/dt voltage slew rates that further increase …
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Soft-switching techniques for high-power PWM converters
Soft-switching techniques can significantly reduce the switching loss and switching stresses of the power semiconductor devices in a power converter. This work presents several soft-switching topologies for high power PWM converters. These new topologies achieve soft-switching functions with …
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Optimal vertical plane booster guidance including pitch dynamics
Soft-switching techniques can significantly reduce the switching loss and switching stresses of the power semiconductor devices in a power converter. This work presents several soft-switching topologies for high power PWM converters. These new topologies achieve soft-switching functions with …
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Passive Balancing of Switching Transients between Paralleled SiC MOSFETs
… with lower Vth to carry more current during switching transient. Paralleled MOSFETs are usually de-rated to guarantee safe operation. Balancing of peak currents during switching transient isthe goal of this work. Integration of current/voltage sensors into paralleled structure is difficult …
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Topology investigation of front end DC/DC converter for distributed power system
… the performance of these topologies. Also, high switching loss limited the power density achievable for these topologies. Two techniques to deal with hold up time issue are discussed in this dissertation: range winding solution and asymmetric winding solution, the efficiency at normal operation …
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Soft-Switching, Interleaved Inverter for High Density Applications
… the latest transistor technology to push switching frequency to shrink passive filter size. Furthermore, while high efficiency is an important thermal handling strategy, it must be weighed against increases in component size. Google's Little Box Challenge shone light on these challenges in …
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Optimization of Nonlinear Switch Cells for Switching Converters
… alone in many power topologies, allowing reduced switching loss without altering the power topology directly. This thesis discusses the development of a switch cell topology that utilizes a saturable resonant inductor to reduce the size and power loss of the cell. Additionally, the cell transfers …
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A Two-Mode Synchronous Buck Converter for Low-Power Devices with the Sleep Mode
… another light load power stage to reduce the switching loss and driving loss at light load. Then, the variable frequency ripple-based constant on-time control with discontinuous conduction mode (DCM) in light load is applied to the baby-buck mode to reduce the switching frequency to further …
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Design of dual-input two phase dc/dc converter with modified pulse width modulation (mpwm)
… by proposing the enhanced Modified PWM (MPWM) switching scheme, it is able to solve the issues of the overlapping unregulated input sources. Furthermore, with the proposed multiphase configuration, the input current stresses in the switching devices are reduced and it has the benefit of a …
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High Frequency, High Current Integrated Magnetics Design and Analysis
… solution to this problem is to increase the switching frequency and control bandwidth of the VRM. As the switching frequency increases the VRM is faced with efficiency and thermal problems. The current buck topologies suffer large drops in efficiency as the frequency increases from high …
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Enabling HF power conversion : magnetic components and a wide voltage range converter
High frequency switching in power converters offers the benefits of high power density and faster transient response; however, high frequency losses have limited efforts to increase frequency into the HF (3-30 MHz) regime. This thesis addresses two of the dominant frequency-dependent loss …
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Cascade Dual-Buck Inverters for Renewable Energy and Distributed Generation
… thanks to no shoot-through problems and lower switching loss with the help of using power MOSFETs. With phase-shift control, it theoretically eliminates the inherent current zero-crossing distortion of the single-unit dual-buck type inverter. In addition, phase-shift control can greatly reduce …
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A SiC JFET-Based Three-Phase AC PWM Buck Rectifier
Silicon carbide (SiC) power switching devices promise to be a major breakthrough for new generation ac three-phase power converters, offering increased junction temperature, low specific on-resistance, fast switching, and low switching loss. These characteristics are desirable for increasing power …
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Application of High-Power Snubberless Semiconductor Switches in High-Frequency PWM Converters
… but lacked the ability to perform high frequency switching. Low-power converters, such as computer power supplies and low horsepower motor drives, have employed high-frequency switching for years and have benefited from very nice output waveforms, good control dynamic performance, and many other …
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Investigation of High-density Integrated Solution for AC/DC Conversion of a Distributed Power System
… AC/DC converters. For PFC stage, at low switching frequency, PFC inductor size is large and limits the power density. Although increasing switching frequency can dramatically reduce PFC inductor size, EMI filter size might be larger at higher switching frequency because of the change of …
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High voltage gain DC-DC converter using interleaved switching technique with PWM for current stress
… with high boost ratio by using Interleaved switching technique in order to reduce the inductance of inductor required in the proposed converter circuit structure. This project considered Marx generator principle to boost-up the voltage where the boost ratio used is 8.33 with three stages of …
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Solar-based Single-stage High-efficiency Grid-connected Inverter
… efficiency by reducing the power semiconductor switching loss and output stable and synchronized sinusoid current into the utility grid. Controlled by the digital signal processor, the inverter can also draw maximum power from the solar array, thereby maximizing the utilization of the solar …
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