Ph.D. Dissertation A Study on Modulated Carrier Control Method for Power Factor Correction Boost Converter BY Jintae Kim
segunda-feira, 4 de abril de 2022
A Study on Modulated Carrier Control Method for Power Factor Correction Boost Converter BY Jintae Kim- Interdisciplinary Program in Photovoltaic System Engineering The Graduate School Sungkyunkwan University
Ph.D. Dissertation A Study on Modulated Carrier Control Method for Power Factor Correction Boost Converter BY Jintae Kim
Interdisciplinary Program in
Photovoltaic System Engineering
The Graduate School
Sungkyunkwan University
Abstract
A Study on Modulated Carrier Control Method
For Power Factor Correction Boost Converter
As demand of electrical devices steeply increases, harmonic pollution on the power grid
has attracted concern. This circumstance leads standards such as IEC61000-3-2 and 80-Plus
regulating harmonic currents or PF (Power Factor) to have been more stringent. Thus, a PFC
(Power Factor Correction) circuit able to improve power quality while reducing current
harmonics has been indispensible at the electrical devices. For the reason, the PFC has been
constantly researched so that various topologies and control types have been proposed and
realized as silicon.
So far, many of proposed PFC converters have each optimal operation mode offering good
PFC performance such as CCM (Continuous Conduction Mode), DCM (Discontinuous
Conduction Mode) or BCM (Boundary Conduction Mode). The same is true of conventional
MCC (Modulated Carrier Control) PFC converters. The conventional MCC PFC method does
not require sensing the line input voltage and offers very fast dynamic current control by
directly comparing an inductor current. These are advantages of the conventional ones.
However, these conventional MCC converters enter into DCM by load reduction, the line
input current is distorted and harmonic current is increased.
In this dissertation, a research on new MCC method is revealed from a study and analysis
on the conventional MCC PFC converter. Two types of MCC method are proposed to
overcome the problem of the conventional MCC aforementioned. The proposed MCC
methods newly employ a circuit to detect DCM region and generate DCM compensation
signal in common. Using the compensation, the MCC methods can control the line input
current as a desirable sinusoidal waveform, which results in better PFC performance
regardless of a line input voltage range or load variation unlike the conventional MCC method.
With all them, the proposed method can maintain the advantages of the conventional MCC
method and even it can be easily implemented with analog or digital circuits.
This dissertation describes the proposed MCC methods and the operating principle. In
addition, to verify the proposed methods, they are implemented in 400 W PFC boost converter.
sábado, 2 de abril de 2022
sábado, 26 de março de 2022
Design of Boost power factor corrector based on UC3854 Boost Controle de Tensão e Corrente
ABSTRACT
PFC (Power Factor Correction) is an effective method to reduce harmonic currents in power grids
The control circuit and parameters design of the PFC circuit .
As shown in Fig.2, in Boost PFC circuit, the control core is internal multiplier of UC3854DW,
through sampling input voltage Vin, input current Iin and output voltage Vo1, the PWM signal is
generated to force the input average current to be in phase with the input voltage, so the power factor
is close to 1
LINK DOWNLOAD PDF FILE: https://www.mediafire.com/file/ggod7qypljhr5z9/Mathcad+-+TRABALHO+FINAL+PFC+CON+3854-A.pdf/file
sábado, 12 de março de 2022
Study on Large Air-Gap Bi-directional Wireless Battery Charger for Electric Vehicles Yoo, Kwang Min Department of Electrical Engineering Graduate School, Myongji University -Seoul, South Korea
Study on Large Air-Gap Bi-directional Wireless Battery Charger for Electric Vehicles
by Yoo, Kwang Min
Department of Electrical Engineering
Graduate School, Myongji University
Directed by professor Lee Jun Young
ABSTRACT
In this paper, we provide battery charging/discharging for electric vehicles,
including hybrid car using a wireless power transmission technology. Because the
power sources of EV and PHEV are fully or partially supplied from batteries
charged from public line, on-board chargers should be mounted.
Conventional on-board battery chargers for PHEV or EV have two-stage
structure of input current shaper for harmonic reduction followed by DC/DC
converter for output control and electrical isolation. And On-board battery
charger is installed in the vehicle at all times. So It will account for constant
volume of the car. It will contribute a constant fuel consumption of the vehicle
by increasing the weight of the electric vehicle. Currently, the most conventional
method is plug-in charging, where a copper connected cable forms the power
link. There are several disadvantages to this method, which have led to the
investigation of inductive charging technology. On-board chargers are burdened
by the need for a cable and plug charger, galvanic isolation of the on-board
electronics, the size and weight of the charger, and safety and issues with
operating in rain and snow. Wireless power transfer (WPT) is an approach that
provides a means to address these problems and offers the consumers a seamless
and convenient alternative to charging conductively. In addition, it provides an
inherent electrical isolation and reduces on-board charging cost, weight and
volume. Depletion of fossil fuel reserves and current practice in generation,
transmission, distribution, and utilization of energy are major worldwide concerns,
for which distributed generation (DG) and harnessing of renewable energy are
considered to be partial and acceptable solutions. However, the quality of power
delivered by DG systems, particularly those based on wind energy and solar
energy, is largely affected by the stochastic nature of their energy production.
Consequently, in order to improve the power quality while meeting the demand in
the most economical and efficient way, energy suppliers relied on energy storage
systems, particularly for DG systems of medium power levels. Among various
storage solutions such as flywheels, batteries, super-capacitors, etc., the
vehicle-to-grid (V2G) concept, which uses hybrid vehicles or pure electric
vehicles (EVs) to store and supply energy back to the grid, is gaining more and
more popularity as hybrid.
High Efficiency High Power Density Gan Based Power Supply Unit (PSU) for Data Center Application-AKASH NEEL DEY, BE THESIS Presented to the Faculty of The University of Texas at Dallas in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE IN ELECTRICAL ENGINEERING
HIGH EFFICIENCY HIGH POWER DENSITY GAN BASED POWER SUPPLY UNIT (PSU) FOR DATA CENTER APPLICATION by AKASH NEEL DEY, BE THESIS
Presented to the Faculty of
The University of Texas at Dallas
in Partial Fulfillment
of the Requirements
for the Degree of
MASTER OF SCIENCE IN
ELECTRICAL ENGINEERING
THE UNIVERSITY OF TEXAS AT DALLAS
May 2020
ABSTRACT
The ever growing consumption of data and its handling has resulted in huge server stations which cover prime land space and consumes huge amounts of power at low voltages causing high inefficiency. This work attempts to evaluate the design of a GaN based high efficiency and high power density server PSU. A two-stage topology is considered where an active front end rectifier converts 208VAC 3-phase supply to 380VDC. An isolated DC-DC LLC converter employing a planar integrated matrix transformer steps down the 380VDC to 48VDC for further distribution in the server rack. The rectifier switches and the primary switches in the LLC are GaN MOSFETs. The analytical loss and volume model of the converter are derived and a multi-objective design optimization for reduction in loss and volume is performed. Hence, a suitable converter design parameter is selected and a prototype design is considered.
VIEW FULL THESIS: https://utd-ir.tdl.org/bitstream/handle/10735.1/9249/DEY-THESIS-2020.pdf?sequence=1&isAllowed=y
Assinar:
Postagens (Atom)