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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 38 for “"conduction loss"”.
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Soft-Switching, Interleaved Inverter for High Density Applications
… at higher frequency while minimizing switching loss. Concurrently, interleaving can reduce current handling stress and conduction loss better than simply paralleling two transistors. A novel interleaved auxiliary resonant snubber for high-frequency soft-switching is introduced. The design of an …
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High Frequency, High Current Density Voltage Regulators
… driver, the proposed converter can save driving loss and synchronous rectifier body diode conduction loss. Additionally, compared to the existing level-shifted self-driven scheme for bridge-type symmetrical topologies, its gate signal ringing is small and suitable for high-frequency applications. …
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GaN Device Characterization, Converter Optimization and Development for Enhanced Aviation Systems
… $R_{DS(on)}$ weakens the advantage on the low conduction loss. The small footprint limits the heat dissipation ability hence the maximum switching frequency.Further improvement of power density may have constraints from passive components, which requires systematic optimization of GaN-based …
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Design of a step-down DC-DC controller integrated circuit with adaptive dead-time control
… the body diode starts to conduct current. The conduction loss through MOSFET switch body diode is minimized. In spice simulation, this scheme increases the overall efficiency in low-voltage applications by up to 3%.
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Characterization of a turbulence bifurcation underlying L-mode confinement transitions on Alcator C-Mod
… by turbulence from the fusion-producing core to conduction loss at the edge. Unfortunately, experiments often exhibit discontinuous changes in scaling behavior as the plasma parameters are varied, termed confinement transitions. Navigating these transitions requires an understanding of the …
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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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Third Quadrant Operation of 1.2-10 kV SiC Power MOSFETs
The third quadrant (3rd-quad) conduction (or reverse conduction) of power transistors is critical for synchronous power converters. For power metal-oxide-semiconductor field-effect-transistors (MOSFETs), there are two current paths in the 3rd-quad conduction, namely the MOS channel path and the …
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A Modified Multiphase Boost Converter with Reduced Input Current Ripple: Split Inductance and Capacitance Configuration
… high ripple current also experience greater peak conduction loss and require larger components. A two-phase implementation of a modified boost converter demonstrates the input current filtering benefits of the modified topology with increased power capacity. In a 12V to 19V 95W design, the …
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High-frequency Quasi-square-wave Flyback Regulator
… 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 parameters design is proposed based on the steady-state model of …
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A Novel Auxiliary Resonant Snubber Inverter Using Wide Bandgap Devices
… which allows reduction of the switching and conduction loss in auxiliary GaN switches to obtain higher system efficiency and better thermal performance. Here, this novel auxiliary resonant snubber circuitry is applied to a traditional full bridge inverter with flexible modulation suitability. …
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High voltage gain DC-DC converter using interleaved switching technique with PWM for current stress
… at the switching devices cause the reduction of conduction loss and switching loss. The efficiency of the proposed converter will be compared by using interleaved switching technique and synchronous switching technique. Principally, the interleaved switching technique able to reduce the current …
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Characterization of MnZn ferrite materials and finite element method for MnZn ferrite core loss calculations
… work presents the method of calculating the core loss in ferrite cores by using a linear and sinusoidal finite element solver based on the material property data (the complex permeability, the dielectric constant, and the AC conductivity) measured in the laboratory. Due to the lack of published …
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MICRO-CIRCUIT DIODE FOR ULTRA-LOW-POWER ENERGY HARVESTING
… to minimize the voltage drop to reduce the conduction loss. However, these designs require either additional power supplies to operate comparators or have a larger threshold turn-on voltage than Schottky. Therefore, most rectifiers have an unresponsive or significant low-efficiency zone when …
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High-performance power converters leveraging capacitor-based energy transfer
… one or more inductors, the charge redistribution loss can be eliminated by inductively charging/discharging the capacitors, a process called soft-charging operation. As a result, the capacitor size can be greatly reduced without reducing the efficiency. A general analytical framework is presented, …
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Topology and Control Investigation of Soft-Switching DC-DC Converters for DC Transformer (DCX) Applications
… is more desirable with ZVS, has no deadtime conduction loss, and almost has load-independent voltage gain. An axis and center symmetric (ACS) method is proposed to achieve this switching transition. Based on this method, an overall design procedure of CLLC-DCX with DAS modulation is also …
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High Slew Rate High-efficiency Dc-dc Converter
… DC current. Parallel ATVC has largely reduced conduction and switching losses. Parallel ATVC also reduces the number of VR bulk capacitors. Combined linear and adaptive nonlinear control has been proposed to reduce delay times in the actual controller, which injects one nonlinear signal in …
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MOSFET-based MMC for low-voltage DC distribution networks
… 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 analysis was carried out for a conventional …
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TECHNOLOGIES TO IMPROVE GAN-BASED LLC RESONANT CONVERTER FOR WIDE INPUT VOLTAGE, HIGH OUTPUT CURRENT AC-DC AND DC-DC APPLICATIONS
… proposed three-phase interleaved topology, the conduction loss and copper loss can be reduced significantly. In addition, the switches current rating is reduced. Due to the resonant component tolerance, severe current unbalance happens in three-phase interleaved LLC converter. To achieve current …
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A Dynamic Magnetic Equivalent Circuit Model For Design And Control Of Wound Rotor Synchronous Machines
… the objectives are to minimize machine mass and loss. Second, a map between current and torque is generated using a single-objective optimization in which core, resistive, and switch conduction loss are minimized. Optimal as well as sub-optimal and traditional controls are studied and compared. …
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Low-power Power Management Circuit Design for Small Scale Energy Harvesting Using Piezoelectric Cantilevers
… circuit including: (i) use of a discontinuous conduction mode (DCM) flyback converter, (ii) constant on-time modulation, and (iii) control of the clock frequency of a microcontroller unit (MCU). The DCM flyback converter behaves as a lossless resistor to match the source impedance for maximum …
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