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 39 for “"flyback"”.
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High-frequency Quasi-square-wave Flyback Regulator
… determine whether it was feasible to switch the flyback converter at 5 MHz in order to improve the power density 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 …
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A Comparison between Different Snubbers for Flyback Converters
The DC-DC flyback power converter is widely used in low power commercial and industrial applications ( > 150 W) such as in computers, telecom, consumer electronics because it is one of the simplest and least expensive converter topologies with transformer isolation. Its main power circuit consists …
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Modeling strategy for EMI filter and flyback transformer
… introduces issues in conducted emissions. In a flyback converter, the transformer serves as the path for common mode current flowing from the primary side to the secondary side. Different winding technologies have been invented and implemented to reduce the capacitance between the primary side …
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Zero voltage switching flyback and forward converter topologies
… density, distributed power supplies. Both the flyback and forward converter topologies are good candidates for these applications, owing to their simple circuitry. These topologies, however, require practical performance improvements. Improved zero voltage switching (ZVS) flyback and forward …
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Analysis of a dual mode forward/flyback converter
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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SPICE simulation and modeling of DC-DC flyback converter
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Bi-directional Flyback Converter Circuit Design for Flapping-wing Microrobots
… the powering circuit itself. The bidirectional flyback topology is chosen and explored, and a complete simulation and analysis are presented. It can be shown that with a careful component selection and a careful pulse frequency modulation, the bidirectional flyback converter can achieve a much …
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Reactive power support capability of flyback microinverter with pseudo-dc link
The flyback micro-inverter with a pseudo-dc link has traditionally been used for injecting only active power in to the power distribution network. In this thesis, a new approach will be proposed to control the micro-inverter to supply reactive power to the grid which is important for grid voltage …
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Comparison of input current spectral components for flyback PWM and resonant converters
… describing the input current spectrum of the flyback Pulse-Width-Modulated, Zero-Current-Switched Quasi-Resonant-Converter, and Zero-Voltage-Switched Quasi-Resonant-Converter are derived in terms of normalized circuit parameters. These analytical results are tested against experimental …
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Βέλτιστος σχεδιασμός του αντιστροφέα ρεύματος Flyback για εφαρμογή του σε φωτοβολταϊκά πλαίσια εναλλασσόμενου ρεύματος
… ενός αντιστροφέα ρεύματος τύπου Flybcak (Flyback Current Source Inverter – Flyback CSI). Οι κύριοι στόχοι που έπρεπε να εκπληρωθούν για την ολοκλήρωση της παρούσας διατριβής ήταν: Η ενδελεχής ανάλυση της λειτουργίας του αντιστροφέα για δύο διαφορετικές στρατηγικές ελέγχου που …
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Bi-directional Flyback DC-DC Converter for Battery System of the DC House Project
… needs. This thesis proposes a bi-directional flyback power converter to allow a single-stage power path to charge the battery from and to discharge the battery to the DC House 48 V system bus. The design, simulation, and hardware prototype of the proposed flyback bi-directional converter will …
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Designing and Implementing a Micro-controller based Primary-side Sensing Flyback Converter for LEDs Driver
… lifespan. By employing a primary-side sensing flyback converter and the PIC18F micro-controller series, an LED driver could achieve two important features: (1) the compatibility with the available lighting fixtures, and (2) reducing unit price. The flyback converter was chosen for its …
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Development of an isolated flyback converter employing boundary-mode operation and magnetic flux sensing feedback
… feedback and boundary-mode operation in a flyback converter to create a simple, small, low-cost, isolated, and tightly regulated power supply. Although each technique has been implemented before, the marriage of these two concepts is new. The union of these two techniques is powerful in …
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Βέλτιστος σχεδιασμός μικρο-αντιστροφέα τύπου flyback για τη σύνδεση φωτοβολταϊκού πλαισίου με το δίκτυο χαμηλής τάσης
… συμπεριφοράς του μικρο-αντιστροφέα τύπου Flyback, με στόχο την επίτευξη του υψηλότερου δυνατού σταθμισμένου βαθμού απόδοσης. Προτείνεται μία νέα υβριδική μέθοδος παλμοδότησης του μικρο-αντιστροφέα τύπου Flyback, η DBCM, η οποία συνδυάζει τα πλεονεκτήματα των ήδη υπαρχουσών μεθόδων DCM και …
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Improvements to a Bi-directional Flyback DC-DC Converter for Battery System of the DC House Project
… electrical needs of the house. A bi-directional flyback power converter was initially designed to allow a battery to charge from as well as discharge to the 48V bus line of the DC House. The design provided a 35W prototype to demonstrate the converter’s feasibility. Further improvements to …
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Electrical, Thermal, and EMI Designs of High-Density, Low-Profile Power Supplies
… EMI aspects. Emphasis is placed on forward and flyback converters. 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 …
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Use of SIMO Converstion for Optimizing LED Light Drivers
… of a Multiple Independently Regulated Output Flyback (MIROF) converter, used in LED lighting for the purpose of multiple string control. This converter is based upon SIMO technology applied to a PFC Flyback converter. The result was the development of a novel control method and an operational …
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Vibration-to-electric energy conversion using a mechanically-varied capacitor
… charge pump with an asynchronous inductive flyback mechanism to re- turn the pumped energy to a central reservoir. A cantilever beam variable capacitor with 650 pF DC capacitance and 347.77 pF zero-to-peak AC capacitance, formed by a 43.56 cm2 spring steel top plate attached to an aluminum …
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Design and control of photoflash capacitor charging circuits
… thesis will study the operation and losses of a flyback capacitor charger. Specifically, the thesis will focus on minimizing the solution size, given an input current, in addition to keeping efficiency acceptable.
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Low-power Power Management Circuit Design for Small Scale Energy Harvesting Using Piezoelectric Cantilevers
… (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 power point tracking …
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