ISOLOOP
MAGNETIC COUPLERS
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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 'ISOLOOP MAGNETIC COUPLERS'.
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.
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
Figure 1. 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.
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