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 18 of 18 for “"synchronous rectification"”.
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Improvements of Synchronous Rectification on LLC-DCX
… when implementing drain-source voltage sensed synchronous rectification (SR) on LLC DC-Transformers (DCXs). Firstly, a current resonance issue caused by the SR controller, and secondly a early turn-off issue from parasitics present in the drain-source sensing path. Two novel methods are …
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Compact Isolated High Frequency DC/DC Converters Using Self-Driven Synchronous Rectification
… self-driven method to drive the secondary side synchronous rectifiers. The loss saving self-driven method introduces two additional transformers that increase the overall footprint of the converter. Also, this thesis proposes a new magnetic integration method to eliminate the need for the two …
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Direct Current Transformer (DCX): Converter Integration, Modular Operation, and Efficiency Improvement Through Synchronous Rectification
El Transformador de Corriente Continua (DCX) es un convertidor CC-CC aislado de relación fija, opera sin control en lazo cerrado, generalmente basado en topologías resonantes para maximizar la eficiencia. Está compuesto por un Generador de Tensión Conmutada de Alta Frecuencia, un transformador, un …
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Electrical, Thermal, and EMI Designs of High-Density, Low-Profile Power Supplies
… The efficiency improvements of employing synchronous rectification are theoretically derived and experimentally verified in forward and flyback converters. The performances of synchronous rectifiers in forward converters are analyzed with regards to transformer reset and SR driven method. …
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Design of low-voltage, high-bandwidth radio frequency power converters
… for low-voltage power conversion and employs synchronous rectification to improve efficiency. The converter is also comprised of a high-bandwidth and high-switching-frequency inverter topology that can dynamically adjust the output power from one-quarter to full power, while maintaining good …
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Predictive comparators with adaptive control
… is ideally suited for applications such as synchronous rectification but will also find broad applicability anywhere an asynchronous comparator is required, such as sensor interfaces, oscilloscope triggers, and some types of analog-digital converters.
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Design of control for efficiency of AUV power systems
… engine while sensing the voltage coming out of a synchronous rectification bridge. This scheme keeps the throttle above 50% unless the power requirement of the charger drops suddenly. Finally, the control scheme was implemented in software, along with controls for engine starting and shutdown.
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High Voltage Synchronous Rectifier Design Considerations
… during this high voltage transition is the synchronous rectifier, which is traditionally designed as an afterthought. Prior research in synchronous rectifiers have been limited to low voltage, high current converters. There is practically no research in high voltage synchronous …
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Integrated circuit control of resonant and hard switched dc/dc converters for industrial and educational applications
This thesis presents an integrated secondary side synchronous rectification controller, designed on a modern industrial silicon IC process, for use in the LLC resonant converter topology. The controller is intended to function in systems with output power levels up to 500 W and switching …
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High Efficiency Optimization of LLC Resonant Converter for Wide Load Range
… improve efficiency of LLC resonant converters, synchronous rectification must be used. The complete solution of synchronous rectification of LLC resonant converters is discussed in this thesis. The driving of the synchronous rectifier can be realized by sensing the voltage Vds of the SR. The …
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A modified asymmetrical pulse-width modulated series resonant DC/DC converter
… improve the performance, the use of MOSFETs as synchronous rectifiers in place of diode rectifiers is proposed. Two examples of synchronous rectifier topologies that are applicable to the converter under study are investigated. Computer simulation shows the feasibility of employing synchronous …
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MOSFET-based MMC for low-voltage DC distribution networks
… the use of MOSFETs with the feature of synchronous rectification which provide lower conduction loss and allows parallel-connection to further reduce the losses.Power losses are calculated to show that the efficiency of MMC can exceed that of a conventional 2-level converter. Comparative …
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Design of a wide input supply range buck-boost converter
… Modulation (PFM) mode during steady-state. Synchronous rectification operations are supported for the buck-boost converter through the implementation of a novel anti-backflow current system which greatly reduces the quiescent current consumption. The converter is designed in AMS High-Voltage …
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Design and Implementation of a Radiation Hardened GaN Based Isolated DC-DC Converter for Space Applications
… Full Bridge DC-DC Isolated converter with synchronous rectification for space applications. Recently released radiation hardened GaN FETs were used in the Full Bridge and synchronous rectifier power stages. A survey outlining the benefits of new radiation hardened GaN FETs for space power …
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High-frequency multi-resonant power conversion techniques
… at several megahertz by means of resonant synchronous rectification is investigated using circuit analysis with nonlinear-capacitance MOSFET and Schottky diode models.
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Microcontroller (MCU) Based Simplified Optimal Trajectory Control (SOTC) for High-Frequency LLC Resonant Converters
… burst mode for light-load efficiency and synchronous rectification (SR) driving is provided. Multi-step SOTC for fast load transient response is proposed to apply cost-effective digital controllers to high-frequency LLC converters; SOTC for soft start-up with only sensing Vo is proposed to …
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Single-Stage Wireless Power Transfer System with Single-Switch Secondary Side Modulation
… the duty cycle of the secondary side synchronous rectifier (SR) switch is modulated to control the output voltage or current. By modulating the SR duty cycle, output of the WPT system can be controlled without requiring additional regulator stages/power devices, a primary side sensing …
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High-Efficiency and High-Power Density DC-DC Power Conversion Using Wide Bandgap Devices for Modular Photovoltaic Applications
… active-boost-rectifier can not only serve for synchronous rectification but also achieve the voltage boost function. The proposed converter can achieve zero-voltage-switching (ZVS) of primary side switches and zero-current-switching (ZCS) of secondary side switches regardless of the input …