isoloop magnetic coupler
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sreekanth manohar
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#1
16-01-2010, 04:58 PM


sir i need full report of this seminar and presentation topic....... Huh
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03-04-2010, 07:23 PM


.docx   Isoloop Magnetic Couplers.docx (Size: 138.29 KB / Downloads: 106)
ISOLOOP MAGNETIC COUPLERS'.Couplers, also known as "isolators" because they electrically isolate as well as transmit data, are widely used in industrial and factory networks, instruments, and telecommunications. Every one knows the problems with optocouplers. They take up a lot of space, are slow, optocouplers age and their temperature range is quite limited. For years, optical couplers were the only option. Over the years, most of the components used to build instrumentation circuits have become ever smaller. Optocoupler technology, however, hasn't kept up. Existing coupler technologies look like dinosaurs on modern circuit boards.
Magnetic couplers are analogous to optocouplers in a number of ways. Design engineers, especially in instrumentation technology, will welcome a galvanically-isolated data coupler with integrated signal conversion in a single IC. My report will give a detailed study about '


2.1 GROUND LOOPS
When equipment using different power supplies is tied together (with a common ground connection) there is a potential for ground loop currents to exist. This is an induced current in the common ground line as a result of a difference in ground potentials at each piece of equipment. Normally all grounds are not in the same potential.
Widespread electrical and communications networks often have nodes with different ground domains. The potential difference between these grounds can be AC or DC, and can contain various noise components. Grounds connected by cable shielding or logic line ground can create a ground loop-unwanted current flow in the cable. Ground-loop currents can degrade data signals, produce excessive EMI, damage components, and, if the current is large enough, present a shock hazard.
Galvanic isolation between circuits or nodes in different ground domains eliminates these problems, seamlessly passing signal information while isolating ground potential differences and common-mode transients. Adding isolation components to a circuit or network is considered good design practice and is often mandated by industry standards. Isolation is frequently used in modems, LAN and industrial network interfaces (e.g., network hubs, routers, and switches), telephones, printers, fax machines, and switched-mode power supplies.

3. GALVANIC COUPLERS
Magnetic couplers are analogous to optocouplers in a number of ways. Optocouplers transmit signals by means of light through a bulk dielectric that provides galvanic isolation

. Both optical (A) and magnetic isolators (B) provide galvanic isolation between electronic input and output. Magnetic isolators transmit the signal by a magnetic field rather than by photons.

Magnetic couplers transmit signals via a magnetic field, rather than a photon transmission, across a thin film dielectric that provides the galvanic isolation. As is true of optocouplers, magnetic couplers are unidirectional and operate down to DC. But in contrast to optocouplers, magnetic couplers offer the high-frequency performance of an isolation transformer, covering nearly the entire combined bandwidth of the two conventional isolation technologies

2. INDUSTRIAL NETWORKS NEED ISOLATION
Use Search at http://topicideas.net/search.php wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion
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11-03-2011, 01:56 PM


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CHAPTER 1
INTRODUCTION

Couplers, also known as "isolators" because they electrically isolate as well as transmit data, are widely used in industrial and factory networks, instruments, and telecommunications. Every one knows the problems with optocouplers. They take up a lot of space, are slow, optocouplers age and their temperature range is quite limited. For years, optical couplers were the only option. Over the years, most of the components used to build instrumentation circuits have become ever smaller. Optocoupler technology, however, hasn’t kept up. Existing coupler technologies look like dinosaurs on modern circuit boards.
Magnetic couplers are analogous to optocouplers in a number of ways. Design engineers, especially in instrumentation technology, will welcome a galvanically isolated data coupler with integrated signal conversion in a single IC. My report will give a detailed study about ‘ISOLOOP MAGNETIC COUPLERS’.
CHAPTER 2
INDUSTRIAL NETWORKS NEED ISOLATION
2.1 GROUND LOOPS

When equipment using different power supplies is tied together (with a common ground connection) there is a potential for ground loop currents to exist. This is an induced current in the common ground line as a result of a difference in ground potentials at each piece of equipment. Normally all grounds are not in the same potential.
Widespread electrical and communications networks often have nodes with different ground domains. The potential difference between these grounds can be AC or DC, and can contain various noise components. Grounds connected by cable shielding or logic line ground can create a ground loop unwanted current flow in the cable. Ground-loop currents can degrade data signals, produce excessive EMI, damage components, and, if the current is large enough, present a shock hazard.
Galvanic isolation between circuits or nodes in different ground domains eliminates these problems, seamlessly passing signal information while isolating ground potential differences and common-mode transients. Adding isolation components to a circuit or network is considered good design practice and is often
mandated by industry standards. Isolation is frequently used in modems, LAN and industrial network interfaces (e.g., network hubs, routers, and switches), telephones, printers, fax machines, and switched-mode power supplies.
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varun pathak
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#4
16-09-2011, 04:49 AM

thanks for this report , its really help full.
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16-09-2011, 09:27 AM

To get more information about the topic "isoloop magnetic coupler" please refer the link below

topicideashow-to-isoloop-magnetic-coupler?pid=56586#pid56586
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08-03-2012, 03:46 PM

isoloop magnetic coupler


.pptx   isoloop magnetic coupler.pptx (Size: 371.11 KB / Downloads: 37)

INTRODUCTION



A coupler is an an electronic circuit which is used to couple or (isolate) two pieces of an electronic equipment or two different euipments.
The couplers transmit signals and data between two circuits without any electrical connection.
conventional optocouplers take up a lot of space,are slow and have limitation on temperature range.Their age is also less.
Isoloop magnetic couplers are similar to optocoupler in many ways. They are galvanically isolated data couplers with integrated signal conversion in a single IC.My presentation will give a brief study about “ISOLOOP MAGNETIC COUPLERS”.

OTHER SIMILAR DEVICES

Mechanical Relays can also provide isolation, but even small relays tend to be fairly bulky compared with ICs. Because relays are electro-mechanical, they are not as reliable and are only capable of relatively low speed operation.
Transformer is similar, but only for AC but Magnetic coupler can be used for DC.
Where small size, higher speed and greater reliability are important, a much better alternative is to use a magnetic coupler. It consists of an on chip microscopic coil that generates a magnetic field and a GMR sensor that detects that field.A thin film of dielectric is used for galvanic isolation.

MAGNETIC COUPLER

Magnetic couplers transmit signals via a magnetic field, rather than a photon transmission, across a thin film dielectric that provides the galvanic isolation. As is true of opto couplers, magnetic couplers are unidirectional and operate down to DC. But in contrast to opto couplers, magnetic couplers offer the high-frequency performance of an isolation transformer, covering nearly the entire combined bandwidth of the two conventional isolation technologies.

PHYSICS OF GIANT MAGNETORESISTANCE

Large magnetic field dependent changes in resistance are possible in thin film ferromagnet / nonmagnetic metallic multilayers. The phenomenon was first observed in France in 1988, when changes in resistance with magnetic field of up to 70% were seen. Compared to the small percent change in resistance observed in anisotropic magneto resistance, this phenomenon was truly ‘giant’ magneto resistance.
The spin of electrons in a magnet is aligned to produce a magnetic moment. Magnetic layers with opposing spins (magnetic moments) impede the progress of the electrons (higher scattering) through a sandwiched conductive layer. This arrangement causes the conductor to have a higher resistance to current flow.










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