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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 48 for “"high switching frequency"”.
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Digital control based on both small and large signal model based approaches for high switching frequency switched mode power converters
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Condition monitoring of SiC MOSFETs on LLC resonant converter
… are widely acknowledged for low loss, fast switching and remarkable thermal conductivity compared to silicon (Si) counterparts. SiC-based power electronic converters, therefore, are optimal when operated at medium voltage to high voltage in high switching frequency applications, which …
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Investigation of High-density Integrated Solution for AC/DC Conversion of a Distributed Power System
… because of its modularity, maintainability and high reliability. Due to limited space and increasing power consumption, power supplies for telecom and server systems are required to deliver more power with smaller volume. As the key component of DPS system, front-end AC/DC converter is under the …
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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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Characterizing and modeling methods for power converters
… factor. With the evolution of technology, the switching frequency in a power converter is pushed to a higher frequency range, e.g., several MHz or even higher, to decrease its size. However, the loss generated in the converter increases drastically due to the high switching frequency. In …
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Multilevel capacitor-clamped DC-DC boost converter structure with soft-switching technique implementation for high power density achievement
… DC-DC boost converter (CCBC) with soft-switching implementation for high power density achievement. The proposed 4-level CCBC has an ability to reduce the size and volume of passive components and have similar characteristics with the conventional DC-DC converter. Principally, the …
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Development of a power electronics for a flywheel energy storage system
… scheme is proposed to solve this problem. Third, high-switching frequency is necessary for the flywheel charger/discharger in order to reduce the size/weight of the system and to synthesize the high-frequency motor/generator current waveforms. A working prototype demonstrates that a high …
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Analysis and design of high power density resonant switched-capacitor converters
… to create power electronic converters that have high energy density (are very small) and high efficiency (few losses). Switched-capacitor (SC) topologies that utilize the high energy density of capacitors are a candidate for fulfilling these two criteria. However, there are inherent limitations …
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The parallel connection of single phase DC to AC power converters
… insulated-gate bipolar transistors (IGBTs), a high switching frequency (10 kHz to 20 kHz), and a frequency modulated (FM) communication scheme. Thus, the modularity is enhanced by using an FM signal in order to eliminate the wiring normally required to share the converter output current control …
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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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Active-clamp PWM converters: design-oriented analysis and small-signal characterization
… to the use of an active clamp (ACL) circuit in high-frequency PWM converters with an electrical isolation. Existing design guidelines and design trade-offs for the ACL in forward and flyback converters are reviewed, and specific properties of both circuits that are caused by the ACL are …
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A Novel Auxiliary Resonant Snubber Inverter Using Wide Bandgap Devices
… on system size and weight. Achieving high power density need to combine lasted wide bandgap (WBG) device technology and high switching frequency to reduce passive filter size thus further shrink overall space. While still maintaining decent power conversion efficiency and low …
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Time-based control techniques for integrated DC-DC conversion
Time-based control techniques for the design of high switching frequency buck converters are presented. Using time as the processing variable, the proposed controller operates with CMOS-level digital-like signals but without adding any quantization error. A ring oscillator is used as an integrator …
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High-Frequency Oriented Design of Gallium-Nitride (GaN) Based High Power Density Converters
… over silicon (Si) devices including the faster switching speed and lower switching losses, WBG-based power converter can adopt a higher switching frequency and pursue higher power density and higher efficiency. As a trade-off of the advantages, there also exist the high-frequency-oriented …
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An AC-AC inverter for high frequency power distribution system
… systems require the power source to be high frequency ac type and be combined with line current Power Factor Correction that satisfies IEC 1000-3-2 standard. In addition, low power applications require high efficiency, high power density and cost effectiveness. This thesis provides a …
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High Frequency High-Efficiency Voltage Regulators for Future Microprocessors
… evolution began in power loss reduction when the high-performance Pentium processor was driven by a non-standard, less-than-5V power supply, instead of drawing its power from the 5V plane on the system board. In order to provide the power as quickly as possible, the voltage regulator (VR), a …
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High Power Density and Overcurrent Protection Challenges in the Design of a Three-Phase Voltage Source Inverter for Motor Drive Applications
… a need for smaller and more efficient drives in high performance applications that is dictating unprecedented power density requirements on airborne motor drive systems. In reply to this need, higher switching frequencies are being sought and new switching devices like Silicon Carbide (SiC) JFETs …
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Synchronous-Conduction-Mode Tapped-Inductor Buck Converter for Low-Power, High-Density Application
… in electronic system for processing energy from high-voltage rail to low-voltage circuits. The applications can be found at the auxiliary supplies in automobile, industrial and communication systems. Buck converter is a common circuit topology to fulfill step-down conversion, especially in …
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Device Selection Criteria--Based on Loss Modeling and Figure of Merit
… has been struggling to operate the VR/VRM at higher and higher switching frequencies while maintaining acceptable power conversion efficiency. As a consequence, the power switches used in the VR/VRM must be able to work efficiently at a higher switching frequency and with a higher current …
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Architectures and circuits for low-voltage energy conversion and applications in renewable energy and power management
… achieves both large voltage step-down and high switching frequency, while maintaining good efficiency. We explore the benefits of a new soft-charging technique that drastically reduces the major loss mechanism in switched-capacitor converters, and we show experimental results from a 5-to-1 …
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