This document discusses magnetically coupled circuits and transformers. It defines mutual inductance and describes how it allows induction of voltage between coupled coils. It examines energy storage in coupled circuits and the coupling coefficient. Ideal and linear transformers are analyzed, including voltage transformation ratios, impedance matching applications, and using transformers for isolation. Examples are provided for calculating currents, impedances, energy, turns ratios, and matching circuits.
This chapter provides complete description of two port network parameters. It also provides relationship between different parameters. Also it provides condition for symmetry and reciprocity.
This chapter provides complete description of two port network parameters. It also provides relationship between different parameters. Also it provides condition for symmetry and reciprocity.
A silicon-controlled rectifier or semiconductor-controlled rectifier is a four-layer solid-state current-controlling device. Some sources define silicon-controlled rectifiers and thyristors as synonymous,[5] other sources define silicon-controlled rectifiers as a proper subset of the set of thyristors. SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded. Their operation makes them suitable for use in medium- to high-voltage AC power control applications, such as lamp dimming, power regulators and motor control.
Prof. Cuk invited talk at APEC 2011 plenary session to celebrate
35 years of his creation of this modeling and analysis method.
This talk was also recorded on video by IEEE.tv and can be viewed together. Here is a link to that video.
https://youtu.be/BLx57J2fF5w
Note: first few minutes of the video is Prof. Cuk's interview made after his presentation. This is thern followed by full 25 minutes presentation, which can be followed by the enclosed 67 slides.
A Comparative Study of Various AC-DC Converters for Low Voltage Energy Harves...paperpublications3
Abstract: Electromagnetic microscale and mesoscale power generators with low voltage outputs are now widely used as kinetic energy harvesters. The extrinsic vibrations on the generator can excite the internal oscillations between the proof mass magnet and the electrical damper coils. These oscillations produce a periodically varying magnetic flux in coil, inducing a corresponding AC output voltage. This output can be converted to dc and can be used to supply power to electronic loads. The conventional AC-DC converters for energy harvesting system with diode rectifiers suffer considerable voltage drop resulting increase in power loss of circuitry and complexity. As a remedy various bridgeless boost converters were designed and implemented. Standard H bridge converter with 4 switch or 2 switch, dual polarity boost converters, parallel combination of boost and buck-boost converter, integrated boost and buck-boost combination bridgeless rectifier are some of these. These circuits are studied, simulated and compared. The simulation models are drawn and simulated using MATLAB R2010a.
A silicon-controlled rectifier or semiconductor-controlled rectifier is a four-layer solid-state current-controlling device. Some sources define silicon-controlled rectifiers and thyristors as synonymous,[5] other sources define silicon-controlled rectifiers as a proper subset of the set of thyristors. SCRs are mainly used in devices where the control of high power, possibly coupled with high voltage, is demanded. Their operation makes them suitable for use in medium- to high-voltage AC power control applications, such as lamp dimming, power regulators and motor control.
Prof. Cuk invited talk at APEC 2011 plenary session to celebrate
35 years of his creation of this modeling and analysis method.
This talk was also recorded on video by IEEE.tv and can be viewed together. Here is a link to that video.
https://youtu.be/BLx57J2fF5w
Note: first few minutes of the video is Prof. Cuk's interview made after his presentation. This is thern followed by full 25 minutes presentation, which can be followed by the enclosed 67 slides.
A Comparative Study of Various AC-DC Converters for Low Voltage Energy Harves...paperpublications3
Abstract: Electromagnetic microscale and mesoscale power generators with low voltage outputs are now widely used as kinetic energy harvesters. The extrinsic vibrations on the generator can excite the internal oscillations between the proof mass magnet and the electrical damper coils. These oscillations produce a periodically varying magnetic flux in coil, inducing a corresponding AC output voltage. This output can be converted to dc and can be used to supply power to electronic loads. The conventional AC-DC converters for energy harvesting system with diode rectifiers suffer considerable voltage drop resulting increase in power loss of circuitry and complexity. As a remedy various bridgeless boost converters were designed and implemented. Standard H bridge converter with 4 switch or 2 switch, dual polarity boost converters, parallel combination of boost and buck-boost converter, integrated boost and buck-boost combination bridgeless rectifier are some of these. These circuits are studied, simulated and compared. The simulation models are drawn and simulated using MATLAB R2010a.
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Soft Switched Multi-Output Flyback Converter with Voltage DoublerIJPEDS-IAES
A novel multi-output voltage doubler circuit with resonant switching
technique is proposed in this paper. The resonant topology in the primary
side of the flyback transformer switches the device either at zero voltage or
current thus optimizing the switching devices by mitigating the losses. The
voltage doubler circuit introduced in the load side increases the voltage by
twice the value thereby increasing the load power and density. The proposed
Multi-output Isolated Converter removes the need for mutiple SMPS units
for a particular application. This reduces the size and weight of the
converters considerably leading to a greater payload. This paper aims at
optimizing the proposed converter with some design changes. The results
obtained from the hardware prototype are given in a comprehensive manner
for a 3.5W converter operating at output voltages of 5V and 3.3V at 50 kHz
switching frequency. The converter output is regulated with the PI controller
designed with SG3523 IC. The effects of load and line regulation for ±20%
variations are analyzed in detail.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
2. 2
Magnetically Coupled CircuitMagnetically Coupled Circuit
Chapter 13Chapter 13
13.1 What is a transformer?
13.2 Mutual Inductance
13.3 Energy in a Coupled Circuit
13.4 Linear Transformers
13.5 Ideal Transformers
13.6 Applications
3. 3
13.1 What is a transformer? (1)13.1 What is a transformer? (1)
• It is an electrical device designed on the
basis of the concept of magnetic coupling
• It uses magnetically coupled coils to
transfer energy from one circuit to another
• It is the key circuit elements for stepping
up or stepping down ac voltages or
currents, impedance matching, isolation,
etc.
4. 4
13.2 Mutual Inductance (1)13.2 Mutual Inductance (1)
• It is the ability of one inductor to induce a voltage across a
neighboring inductor, measured in henrys (H).
dt
di
Mv 1
212 =
dt
di
Mv 2
121 =
The open-circuit mutual
voltage across coil 2
The open-circuit mutual
voltage across coil 1
5. 5
13.2 Mutual Inductance (2)13.2 Mutual Inductance (2)
• If a current enters the dotted terminal of one coil,
the reference polarity of the mutual voltage in the
second coil is positive at the dotted terminal of
the second coil.
Illustration of the dot convention.
6. 6
13.2 Mutual Inductance (3)13.2 Mutual Inductance (3)
)connectionaiding-(series
221 MLLL ++=
Dot convention for coils in series; the sign indicates the
polarity of the mutual voltage; (a) series-aiding connection,
(b) series-opposing connection.
)connectionaiding-(series
221 MLLL ++=
7. 7
13.2 Mutual Inductance (4)13.2 Mutual Inductance (4)
Time-domain
analysis of a circuit
containing coupled
coils.
Frequency-domain
analysis of a circuit
containing coupled
coils
8. 8
13.2 Mutual Inductance (5)13.2 Mutual Inductance (5)
Example 1
Calculate the phasor currents I1 and I2 in the
circuit shown below.
A04.1491.2IA;39.4901.13I 21 °∠=°−∠=Ans:
*Refer to in-class illustration, textbook
9. 9
13.3 Energy in a Coupled Circuit (1)13.3 Energy in a Coupled Circuit (1)
• The coupling coefficient, k, is a measure of the
magnetic coupling between two coils; 0≤k≤1.
• The instantaneous energy stored in the circuit is
given by
21LLkM =
21
2
22
2
11
2
1
2
1
IMIiLiLw ±+=
10. 10
13.3 Energy in a Coupled Circuit (2)13.3 Energy in a Coupled Circuit (2)
Example 2
Consider the circuit below. Determine the coupling
coefficient. Calculate the energy stored in the coupled
inductors at time t = 1s if v=60cos(4t +30°) V.
Ans: k=0.56; w(1)=20.73J*Refer to in-class illustration, textbook
11. 11
13.4 Linear Transformer (1)13.4 Linear Transformer (1)
• It is generally a four-terminal device comprising
tow (or more) magnetically coupled coils
impedancereflected
LjR
M
LjR
L
RR is
Z
Z,Z
I
V
Z
22
22
11
1
in
++
=++==
ω
ω
ω
12. 12
13.4 Linear Transformer (2)13.4 Linear Transformer (2)
Example 3
In the circuit below, calculate the input impedance
and current I1. Take Z1=60-j100Ω, Z2=30+j40Ω, and
ZL=80+j60Ω.
Ans: A1.1135.0I;1.5314.100Z 1in °∠=Ω°−∠=
*Refer to in-class illustration, textbook
13. 13
13.5 Ideal Transformer (1)13.5 Ideal Transformer (1)
• An ideal transformer is a unity-coupled, lossless transformer
in which the primary and secondary coils have infinite self-
inductances.
(a) Ideal Transformer
(b) Circuit symbol
nN
N
n
N
N 1
I
I
V
V
2
1
1
2
1
2
1
2
====
V2>V1→ step-up transformer
V2<V1→ step-down transformer
14. 14
13.5 Ideal Transformer (2)13.5 Ideal Transformer (2)
Example 4
An ideal transformer is rated at 2400/120V, 9.6 kVA, and
has 50 turns on the secondary side.
Calculate:
(a) the turns ratio,
(b) the number of turns on the primary side, and
(c) the current ratings for the primary and secondary
windings.
Ans:
(a) This is a step-down transformer, n=0.05
(b) N1 = 1000 turns
(c) I1 = 4A and I2 = 80A
*Refer to in-class illustration, textbook
15. 15
13.6 Applications (1)13.6 Applications (1)
• Transformer as an Isolation Device to isolate ac
supply from a rectifier
16. 16
13.6 Applications (2)13.6 Applications (2)
• Transformer as an Isolation Device to isolate dc
between two amplifier stages.
17. 17
13.6 Applications (3)13.6 Applications (3)
• Transformer as a Matching Device
Using an ideal transformer to match
the speaker to the amplifier
Equivalent circuit
18. 18
13.6 Applications (4)13.6 Applications (4)
Example 5
Calculate the turns ratio of an ideal
transformer required to match a 100Ω
load to a source with internal impedance
of 2.5kΩ. Find the load voltage when the
source voltage is 30V.
Ans: n = 0.2; VL = 3V
*Refer to in-class illustration, textbook