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 288 for “"PFC"”.
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PCB-Based Heterogeneous Integration of PFC/Inverter
… counterparts. In a power factor correction (PFC) rectifier/inverter, the totem-pole configuration with critical conduction mode (CRM) operation to realize zero-voltage switching (ZVS) is deemed most desirable for a switching frequency 10 times higher than current practice. With a …
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PFC J2EE : botiga de Llibres On- Line KIWIX
L'objectiu del present Projecte final de carrera consisteix en la realització d'un disseny e implementació d'un lloc web de venta de llibres al detall. El sistema mostra a l'usuari una sèrie de productes. Tots aquest productes poden ser adquirits per l'usuari prèvia identificació i validació de les …
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CCM Totem Pole Bridgeless PFC with Ultra Fast IGBT
The totem pole PFC suffers from the Mosfet body diode reverse recovery issue which limits this topology adopted in the CCM high power condition. As the ultra-fast IGBT which is capable of providing 100 kHz switching frequency is available in the market, it is possible to apply the totem pole PFC in …
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Modeling and Control of Single Switch Bridgeless SEPIC PFC Converter
… on the power quality, power factor correction (PFC) has become an important issue in light-emitting diode (LED) lighting applications. A boost converter is one of the most well-known PFC topologies, due to its simple circuitry, simple control scheme and small number of passive components. Even …
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Development and analysis of high-frequency, high-density PFC power conversion
… presents a literature based study on current PFC circuit designs and tradeoffs. It also introduces a specific PFC architecture, which provides a low dc output voltage drawing energy from a wide range ac input voltage while maintaining a high power factor. The architecture includes two stages: …
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Study on Zero Crossing Detection in CRM Totem-pole PFC Converter
The totem-pole PFC is a promising candidate for achieving high efficiency and high-power-density power factor correction. Critical conduction mode (CRM) or triangular current mode (TCM) operation of totem-pole PFCs has become popular for achieving zero-voltage switching (ZVS). This enables pushing …
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AN INQUIRY INTO ECO-LABELING: THE PROMISE OF PREDATOR FRIENDLY CERTIFICATION (PFC)
… in this area is Predator Friendly Certification (PFC). PFC is a 2nd party verified eco-label that embraces and merges the notions of agriculture and conservation through the utilization of such innovative strategies. In theory, eco-labels offer the dual promise of price premiums and simultaneous …
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AN INQUIRY INTO ECO-LABELING: THE PROMISE OF PREDATOR FRIENDLY CERTIFICATION (PFC)
… in this area is Predator Friendly Certification (PFC). PFC is a 2nd party verified eco-label that embraces and merges the notions of agriculture and conservation through the utilization of such innovative strategies. In theory, eco-labels offer the dual promise of price premiums and simultaneous …
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Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage
… grid-tied power conversion systems. Among all PFC converts for single phase system, Boost PFC is the most popular one due to simplicity of structure and high performance. Although the efficiency of Boost PFC keeps increasing with the evolution of semiconductor technology, the intrinsic feature …
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Sex differences in PFC-related behavior after amphetamine exposure and across adolescent development
… changes within the prefrontal cortex (PFC) are thought to mediate the lack of control over reward behavior that is thought to be characteristic of adolescents. A lack of control may lead to more drug use, which may then alter the function of the PFC, leading to further deficits in …
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DM EMI Noise Analysis for Single Channel and Interleaved Boost PFC in Critical Conduction Mode
… mode (CRM) power factor correction converters (PFC) are widely used in industry for low power offline switching mode power supplies. For the CRM PFC, the main advantage is to reduce turn-on loss of the main switch. However, the large inductor current ripple in CRM PFC creates huge DM EMI noise, …
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Single-switch bridgeless PFC sepic with proposed series-line-diodes-clamped configuration for data communication applications
This research presents a Single-Switch Bridgeless PFC (SSBPFC) SEPIC which is passive PFC with proposed series-line-diodes-clamped (SLDC) configuration for circuit structure simplicity and power quality issues mitigation. The structure simplification considers the reduction in number of components, …
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Digital-Based Zero-Current Switching (ZCS) Control Schemes for Three-Level Boost Power-Factor Correction (PFC) Converter
… SMPS structure, ac-dc power-factor correction (PFC) circuits play a key role in regulations of input power factor, harmonics and dc output voltage, which has a decisive effect on entire power-supply performances. Universal ac-line and low-power system (90–264 Vrms, up to 300–400 W) is one of the …
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Thermal and EMI Modeling and Analysis of a Boost PFC Circuit Designed Using a Genetic-based Optimization Algorithm
The boost power factor correction (PFC) circuit is a common circuit in power electronics. Through years of experience, many designers have optimized the design of these circuits for particular applications. In this study, a new design procedure is presented that guarantees optimal results for any …
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Modeling and Characterization of a PFC Converter in the Medium and High Frequency Ranges for Predicting the Conducted EMI
… conduction mode (CCM) power factor correction (PFC) converter as well as the theoretical analysis for the noise generation and propagation mechanisms. In this thesis, multiple modeling and characterization techniques in the medium and high frequency ranges are developed for the circuit …
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Study and Improvement of Single-Stage Power Factor Correction Techniques
… integrated single-stage power factor correction (PFC) converters are presented. The typical PFC cells in the single-stage PFC converter are identified. After that, the necessary PFC condition is derived and verified to understand the principle of the single-stage PFC converters. As an example, the …
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The connectivity of the mammalian prefrontal cortex
The fine scale connections of prefrontal cortex (PFC) were investigated in the rat brain, in order to determine organizational properties of PFC pathways which were previously undefined. Neuroanatomical tract tracers (Fluro-Gold, Fluoro-Ruby, Fluoro-Emerald, Biotinylated dextran amines; Fluorescein …
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Determination of the Structural and Functional Mechanisms of Perfluorocarbon-based Nanoemulsion Particle Interactions with Model Biomembrane Systems
Perfluorocarbon based nanoemulsion particles: PFC-NEPs) are very small sized: ~ 250 nm in diameter) greasy droplets that are enclosed by emulsifying phospholipid monolayer. PFC-NEPs have been extensively developed for target-specific delivery of therapeutic agents such as imaging agents and drug …
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Conducted EMI Noise Prediction and Filter Design Optimization
Power factor correction (PFC) converter is a species of switching mode power supply (SMPS) which is widely used in offline frond-end converter for the distributed power systems to reduce the grid harmonic distortion. With the fast development of information technology and multi-media systems, high …
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