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 91 for “"zero voltage switching"”.
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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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Zero voltage switching flyback and forward converter topologies
… practical performance improvements. Improved zero voltage switching (ZVS) flyback and forward dc/dc converter topologies are developed in this thesis. They employ an auxiliary circuit, with only a few small components and switching devices, to achieve ZVS of the main switch. Steady state …
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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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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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A line and load independent zero voltage switching DC/DC full bridge converter topology
… telecom systems. To achieve these features, soft switching techniques are normally employed. However, the conventional soft switching full bridge converter topologies would either lose the soft switching at some operating conditions, or become rather complex in design and implementation for a few …
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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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Zero Voltage Switching (ZVS) Turn-on Triangular Current Mode (TCM) Control for AC/DC and DC/AC Converters
… of these filters can be reduced by pushing the switching frequency higher. High frequency operation (> 300 kHz) leads to a size in reduction of EMI filters though it also leads to an increase in switching losses thus compromising on efficiency. Thus, soft switching becomes necessary to reduce …
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Design of a Radial Mode Piezoelectric Transformer for a Charge Pump Electronic Ballast with High Power Factor and Zero Voltage Switching
… with high power factor, high efficiency and Zero-Voltage-Switching (ZVS) of the inverter transistors that drive the lamp. This involves selection of PT materials, determination of geometries and the number of physical layers of the PT. A radial mode piezoelectric transformer prototype based …
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High-frequency off-line power conversion using quasi-resonant and multi-resonant techniques
… power conversion technologies, the zero-current-switching (ZCS) and zero-voltage-switching (ZVS) quasi-resonant techniques, and the zero-voltage-switching multi-resonant technique, are evaluated for high-frequency, off-line applications. The study is performed with emphasis on the …
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Investigation and application of high-efficiency large-step-down power conversion architectures
… architectures that are designed to provide zero-voltage switching of the power devices. While the techniques used in these converters can be used in a wide range of applications, the operating voltage and power levels used in this thesis are for data centers, where dc distribution power …
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Novel concepts in high-frequency resonant power processing
… conversion techniques, the constant-frequency zero-voltage-switching multiresonant-converter (CF ZVS-MRC) technique and the zero-voltage-switching technique that uses the magnetizing inductance of the power transformer as a resonant element {ZVS {L<sub>M</sub>)) are proposed. analyzed, and …
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Design of Radial Mode Piezoelectric Transformers for Lamp Ballast Applications
… that could fit a ballast application enabling zero voltage switching (ZVS) for the semiconductors without the use of any external inductance. In the ballast circuit, the piezoelectric transformer is used to replace the conventional inductor-capacitor resonant tank saving valuable space and …
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Circuits and systems for efficient portable-to-portable wireless charging
… impact of changing conditions on power amplifier zero-voltage switching, and its effect on efficiency and power. The control loop adjusts the power amplifier shunt capacitance and series inductance to maintain zero-voltage switching while regulating delivered power. The second half of the thesis …
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Optimization of spacecraft battery charger/discharger systems
… Experimental verification is provided. A novel zero-voltage-switching (ZVS) bidirectional converter topology is presented. A bidirectional battery charger / discharger has several advantages, including a potentially substantial system weight savings. However, it is shown that most of the …
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A modified asymmetrical pulse-width modulated series resonant DC/DC converter
… and high power density at ever-increasing switching frequencies. There are many resonant topologies that can offer this, but the asymmetrical pulse-width modulated (APWM) resonant DC/DC converter is a simple topology that operates at a constant frequency and with near-zero voltage switching …
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High-frequency Quasi-square-wave Flyback Regulator
… of this versatile isolated topology. Soft switching techniques have to be utilized to eliminate the switching loss to maintain high efficiency at multi-megahertz. Compared to the traditional modeling of zero-voltage-switching quasi-square-wave converters, a numerical methodology of …
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Experimental investigation of semiconductor losses in cryogenic DC-DC converters
… may enable other system benefits such as higher voltage lower current feedthroughs which reduce heat leakage into the cryostat. This Thesis studies the performance of several DC-DC power conversion techniques at temperatures down to 20 K. In particular hard switching, synchronous rectifier, …
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Zero-voltage switched resonant and PWM converters: design-oriented analysis and performance evaluation
… different alternatives of bridge topologies with zero-voltage switching is presented. A design-oriented analysis is developed to optimize implementation of the converters in terms of efficiency. Efficiency optimization requires minimizing the circulating currents which are directly proportional to …
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Design of high-density dc/dc converters
Zero- Voltage-Switching Multi-Resonant-Converter (ZVS-MRC) techniques are applied with hybrid microelectronics fabrication technologies to design and implement efficient, high-density (>50 W/in³) dc/dc converters. A low-profile high-density power stage of a 25 W dc/dc flyback ZVS-MRC is designed …
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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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