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Showing 1 to 20 of 25 for “"PFC converter"”.
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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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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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Digital-Based Zero-Current Switching (ZCS) Control Schemes for Three-Level Boost Power-Factor Correction (PFC) Converter
… have been growing to prominence. As front-end converters in typical 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 …
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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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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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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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Digital Control for Power Factor Correction
… controller for a power factor correction (PFC) converter. The development of the telecommunications industry and the Internet demands reliable, cost-effective and intelligent power. Nowadays, the telecommunication power systems have output current of up to several kilo amperes, consisting …
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Transformer Shielding Technique for Common Mode Noise Reduction in Switch Mode Power Supplies
… severe EMI noise issue. In a typical front-end converter, the EMI filter usually occupies 1/3 to 1/4 volume of total converter. Hence, reducing the EMI noise of power converter can help reduce the volume of EMI filter and improving the total power density of the converter. For off-line switch …
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EMI Noise Reduction Techniques for High Frequency Power Converters
… severe EMI noise issue. In a typical front-end converter, the EMI filter usually occupies 1/3 to 1/4 volume of total converter. Hence, reducing the EMI noise of power converter can help reduce the volume of EMI filter and improving the total power density of the converter. The EMI noise can be …
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Power Interface Design and System Stability Analysis for 400 V DC-Powered Data Centers
… data centers. A cascaded totem-pole bridgeless PFC converter to convert grid ac voltage to the 400 V dc voltage is proposed in this work. Three main control strategies are developed for the power converters. First, a model predictive control is developed for the cascaded totem-pole bridgeless …
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Controlling the Vienna rectifier using a simplified space vector pulse width modulation technique
… introduces a multilevel Power-Factor-Correction (PFC) converter in a 2-stage configuration. The first stage is the Vienna rectifier which has a high boosting ratio. To overcome this issue, a high efficiency 4-switch converter is cascaded with the Vienna rectifier. This converter employs …
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Application of Optimization Techniques to the Design of a Boost Power Factor Correction Converter
… the design of a boost power factor correction (PFC) converter with an input electromagnetic interference (EMI) filter at the component level. The analysis is performed based on the particular minimum cost design study of a 1.15 kW unit satisfying a set of specifications. A traditional design …
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Miniaturization of Ac-Dc power converters for grid interface
… we present a two-stage ac/dc grid-connected converter for computer applications. Also known as off-line power supplies, these converters have to meet various demanding specifications such as a wide input voltage range (typically 0-376 V), large voltage step down (typical output voltages range …
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Effects of Input Power Factor Correction on Variable Speed Drive Systems
… VSDs have no input power factor correction (PFC) circuits. This results in harmonic pollution of the utility supply which could be avoided. The impact of the PFC circuit in the overall drive system efficiency, harmonic content, magnitude of the system input current and input power factor is …
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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
… most popular industrial applications. Resonant converters, among a variety of mainstream power converter topologies, are receiving more and more attention owing to their features of high efficiency and high power density. This thesis discusses several challenges to apply LLC resonant converter …
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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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Generalized Average-Current-Mode Control of Single-Phase AC-DC Boost Converters with Power Factor Correction
… control (ACMC) for single-phase ac-dc boost converters with power factor correction (PFC). Traditional ACMC is generalized in a sense that it offers improved performance in the form of significant reduction of the current control loop bandwidth requirement for a given line frequency in …
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Modellistica e progettazione di convertitori elettronici di potenza DC-DC
… experimental verification of power electronic converters. This takes the DC-DC Boost converter as a reference, together with some converter topologies derived from it, such as the interleaved PFC Boost converter. More specifically, in the first part of the dissertation DC-DC converters …
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GaN Device Characterization, Converter Optimization and Development for Enhanced Aviation Systems
… are widely adopted in various soft-switching converters. Based on superior Baliga's Figure of Merit, GaN devices also have advantages over SiC and Si devices in hard switching conditions. However, the existence of dynamic $R_{DS(on)}$ weakens the advantage on the low conduction loss. The small …
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Design and implementation of a universal onboard battery fast charger for transportation electrification applications
… requirement is achieved by varying the AC/DC converter output voltage using the concept of variable DC link rather than fixed DC link in conventional converters. An interleaved boost cascaded-by-buck (IBCBB) power factor correction (PFC) converter has been proposed as an AC/DC converter. Small …
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