Application Note 42047 Power Factor Correction (PFC) Basics


What is Power Factor?
Power factor (pf) is defined as the ratio of the real power (P)
to apparent power (S), or the cosine (for pure sine wave for
both current and voltage) that represents the phase angle
between the current and voltage waveforms (see Figure 1).
The power factor can vary between 0 and 1, and can be either
inductive (lagging, pointing up) or capacitive (leading, pointing
down). In order to reduce an ....etc

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This paper proposes a novel 4-level converter and
instantaneous switching angle detector for a high speed SRM
(Switched Reluctance Motor) drive. The excitation current cannot be sufficiently built up . the demagnetization
current can be easily extended to the negative torque region.The 4-level converter proposed here has additional charge capacitor and an active power switch compare than a conventional asymmetric converter. the high charged voltage of additional capacitor is supplied to the phase winding in the fast excitation mode. Also ....etc

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I am organising a seminar on unity in diversity for our University. I am requesting topics for this seminar

Regards
eunice ....etc

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please do send me the ppt of the project(pendrive to pendrive data transfer without using pc) ....etc

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ppt on 'instantaneous power control of d statcom with consideration of power factor correction'. ....etc

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A Novel Two-Stage Impulse Noise Removal Technique Based on Neural Networks and Fuzzy Decision
Introduction
Images corrupted by impulse noise.
Objectives of noise removal:-
- Suppress the noise.
- To preserve the sharpness of edge.
Two-Stage impulse noise removal techniques used:-
- Neural Networks
- Fuzzy Decision
Neural Network
Neural network: information processing paradigm inspired by biological nervous systems, such as our brain
Structure: large number of highly interconnected proces ....etc

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A Single-Stage PV Module Integrated Converter Based on a Low-Power Current-Source Inverter
Abstract
This paper presents a transformerless three-phase
inverter designed for the integration into a special type of a
photovoltaic (PV) module, which is capable of providing an output
voltage of several hundred volts. The chosen topology, a currentsource
inverter, features a single-stage power conversion system
that directly feeds into the grid. The principle operation and control
is described, and a modified modulation strateg ....etc

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Abstract
This paper presents a simplified sinusoidal uninterruptible power supply (UPS) system. The proposed scheme includes features such as high power factor, low total harmonic distortion and good dynamic response at the ac output voltage. In addition, the scheme has the desirable characteristics of high efficiency, simple circuit and low cost compared with a traditional standalone multiple stages UPS with power factor correction. The paper also presents the circuit operation, the analysis and, experimental results of the proposed UPS sch ....etc

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Abstract

Magnetic servo levitation (MSL) is currently being investigated as an alternative to drive fast-tool servo systems that could overcome the range limitations inherent to piezoelectric driven devices while operating over a wide bandwidth. To control such systems, a feedback-linearized controller coupled with a Kalman filter has been previously described. Performance limitations that degrade tracking accuracy suggest the use of a more robust controller design approach, such as sliding-mode control. Current literature on sliding ....etc

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Abstract
This work describes a novel method in improving the
input current total harmonic distortion (THD) as well as the power
factor of a three-phase suppressed-link rectifier-inverter circuit.
This proposed method makes use of only three bi-directional low
power static switches with a relatively simple gating circuit. This
paper illustrates how the proposed method is superior in reducing
the input current THD of a rectifier-inverter set to about 5%,
which is in line with the requirements of IEE standard 519 1992.
This is acc ....etc

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