Puls YR40.241, YR80.241 Features and Benefits
June 2012
MOSFET Redundancy Modules.....
Improving Upon Redundancy
In a previous issue of “The PULS
Advantage”, the general topic of
paralleling and redundancy was
discussed, along with the guidelines
that should be followed. This issue
will cover the improvements that have
been made in the next generation
of Redundancy Modules where
MOSFETs are used instead of diodes
resulting in improved performance.
Redundancy Module Using Diodes:
Traditional Redundancy Modules
using diodes can see a voltage drop
anywhere from 0.5V all the way up to
1V between the input and output. The
power losses can also be very high
which can create heat issues. The
voltage drop with diodes can further
aggravate a voltage loss that will occur
if a smaller wire is ran over a longer
distance.
The
PULS YR40.241 & YR80.241 Redundancy Modules
Advantage
MOSFET Redundancy Modules:
The benets of using MOSFETs
instead of diodes are signicant.
The lower resistance in a MOSFET
produces substantially lower voltage
drops than with a diode. For the
PULS YR80.241 and a 40A current
draw, a voltage drop of only 50mV is
seen between the input and output.
A traditional diode would see greater
than a 0.5V voltage dip between input
and output. The power losses with
MOSFETs are also dramatically lower
than when using a diode redundancy
module. The same current draw
through a diode would require a heat
sink to dissipate the excess heat. At
normal output capacity, the YR80.241
only loses 2.7W which does not
PULS Power Supplies
630-587-9780
require a heat sink.
40A Dual Input MOSFET
Redundancy Module:
The PULS YR80.241 is the rst
dual input 24VDC, 40A MOSFET
Redundancy Module that is
continuously rated for 80A. The
common mistake made in most
redundancy module designs is that
the unit is typically rated for just the
current of one of the power supplies.
This assumes that only one supply
will be delivering the full current at
a time or splitting the current if load
sharing is involved between supplies.
However, this type of rating does not
take into consideration an overload
or short circuit at the load. If this was
to occur, both power supplies can
deliver their full potential which could
damage the redundancy module either
by overcurrent or by the excess heat.
PULS redundancy modules are always
rated for twice the rated current of the
supply insuring a very reliable system.
This dual input 80A unit is surprisingly
small with a width of only 46mm as
compared to other 40A modules
which require two units to complete
the redundancy circuit. Using a single
compact device saves valuable panel
space. The PULS YR40.241 offers a
24VDC, 20A dual input redundancy
module that is fully rated for 40A and
is only 36mm wide.
Continued on page 2.....
www.pulspower.us
info@puls-us.com
June 2012
The
Advantage
Compact 3-Phase 24VDC,40A 1+1 Redundancy using two PULS QT40.241 & only one YR80.241 redundancy module
Compact Redundancy System:
With the YR80.241 and the QT40.241
power supply, PULS has been able
to t a complete 3-Phase 24VDC,
40A 1+1 redundancy circuit in the
space of just one of the competitor’s
40A 3-Phase supplies. This is a
monumental break through in not only
saving space but also being able to
convert an older stand alone single
power supply design into a redundant
one. Only 266mm of space is required
on the panel and due to the high
efciency in both the power supplies
and redundancy module, the units
can be mounted side by side with no
clearances required. A PULS single
phase 40A redundant circuit can be
mounted in the same fashion and only
takes up 296mm of panel space.
Continued Innovation
PULS was the rst to introduce
MOSFET designed redundancy
module. PULS continues to use
cutting edge technology in all designs
to offer the most compact, efcient,
reliable and cost-effective product
on the market. PULS is truly the DC
power specialist.
Features of the YR40.241 & YR80.241 Redundancy Modules
Uses MOSFETs instead of diodes
Low voltage and power losses
Dual input
40A & 80A continuously rated
Can be used in 1+1 and N+1 redundant applications
Short circuit proof
Protected against reverse polarity
Allows back feeding loads
Operating temperature range -40°C to +70°C
Comprehensive agency approval package
PULS Power Supplies
630-587-9780
www.pulspower.us
info@puls-us.com
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