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 60 for “"zero-voltage-switching (ZVS)"”.
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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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Chemical And Biological Treatment Of Mature Landfill Leachate
The challenges imposed on Voltage Regulator Modules (VRM) become difficult to be achieved with the conventional multiphase buck converter commonly used on PC motherboards. For faster data transfer, a decrease in the output voltage is needed. This decrease causes small duty cycle that is accompanied …
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Novel Current-Fed Boundary-Mode Parallel-Resonant Push-Pull Converter
The inherent difficulty in designing high voltage power supplies is often compounded by demands of high reliability, high performance, and safe functionality. A proposed high step-up ratio DC-DC converter meets the exacting requirements of applications such as uninterruptible power systems, radar, …
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Analysis and design of a 500 kHz series resonant inverter for induction heating applications
… state model includes the evaluation of the zero-voltage switching (ZVS) condition and the determination of the ZVS operating region. Based upon this analysis a frequency control strategy that minimizes circulating energies is proposed. Also, a methodology to design the power stage …
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LLC Resonant Converter Based Single-stage Inverter with Multi-resonant Branches
… converter can achieve high efficiency and soft-switching performance. Since the dc gain curve of the single-resonant LLC converter is flat when the switching frequency is larger than the resonant frequency, namely fs>fr, an additional L-C series resonant branch is paralleled to the original …
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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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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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Compact and efficient power electronics with applications to solar PV, automotive, and aerospace systems
… controlled to achieve quasi-square-wave (QSW) zero-voltage switching (ZVS). ZVS minimizes switching losses and enables high-frequency operation of the converter. The flexible nature of the board enables the converter to be integrated to non-flat surfaces such as motors, pipes, or airfoils. …
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High-Efficiency Soft-Switched Pulsed Plasma Bias Supply System
… (RF) generators play a crucial role as bias voltage sources in plasma-enhanced semiconductor manufacturing processes. Employing pulsed waveforms to generate plasma offers significant improvements in manufacturing precision. However, producing these waveforms is challenging due to the need for …
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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 Novel Auxiliary Resonant Snubber Inverter Using Wide Bandgap Devices
… 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 electromagnetic interference (EMI) with higher switching frequency, soft-switching needs to be …
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Design and evaluation of a reconfigurable stacked active Bridge dc/dc converter for efficient wide load-range operation
… by reducing core loss and extending the zero-voltage switching (ZVS) range. The converter is implemented with a single compact magnetic component, providing power combining, isolation, and energy transfer inductance. The theory of the converter and its various operating modes, referred to …
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An AC-AC inverter for high frequency power distribution system
… high frequency ac-ac inverter operates under Zero Voltage Switching (ZVS) throughout the whole range of the line voltage and load. Hence, high efficiency can be realized under high switching frequency. A unified controller is introduced in the proposed ac-ac inverter to control the dc-ac stage …
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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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High frequency power conversion architecture for grid interface
With the present ac-voltage distribution system, ac-dc converters are key components for driving many dc voltage applications from the ac grid voltage. There are a lot of electronic devices that natively operate from the dc voltage including light emitting diodes (LEDs), personal and laptop …
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Design of a 405/430 kHz, 100 kW Transformer with Medium Voltage Insulation Sheets
… and components must be able to handle higher voltage and current ratings at higher percentages of efficiency while also maintaining low cost and a compact footprint. To meet such demands, medium-voltage resonant converters have been favored by researchers for their ability to operate at higher …
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Current-Transformer Based Gate-Drive Power Supply With Reinforced Isolation
… techniques have led to the development of high-voltage, high-frequency power devices, which are at the heart of high-power converters. SiC metal-oxide semiconductor field-effect transistors (MOSFETs) have advantages over silicon (Si) devices due to their higher breakdown voltage, higher thermal …
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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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Evaluation and Development of Medium-Voltage Converters Using 3.3 kV SiC MOSFETs for EV Charging Application
… the potential areas of advancement are medium-voltage (MV) and high-voltage (HV) applications, due to the growing demand for high-power-density and high-efficiency power electronics converters. These advancements have propelled a wide adoption of electric vehicles (EV), which in the future will …
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