Pluggable Redundant Power Supply Packages
using Switching Regulated Power Supplies
AC-DC single output
Extremely high overall reliability results from connecting two power sources
so that one will continue to provide power to their load even if the other
becomes inoperative. Acopian Redundant Power Packages have all the wiring
done for you - not only isolation diodes, but also switches, meters, adjustments
and output monitor circuits. All you need to do is connect the input and
Applications: Redundant Power should be considered for
any equipment where the highest attainable reliability is essential, and
an unexpected loss of power would be disastrous. Such applications include
communications systems (both voice and data types), computer systems (volatile
memory systems in particular), process controls, utility and municipal systems,
and security/safety alarm systems.
Output Redundancy: Each Redundant Power Package contains
two identical power supplies with their outputs interconnected through a
diode switching arrangement that will detect any fault condition, isolate
it from the system output, and pass only the output of the other supply
with no interruption of output power during the transition.
Operation: The output voltage of the Primary supply is
set approximately 0.2 volt higher than that of the Backup supply. Under
this condition, the Backup supply’s series diode is not forward biased,
and only the Primary supply delivers current to the load. However, if the
Primary supply’s output decreases by more than 0.2 volt, the situation
is reversed, and only the Backup supply delivers current. Each power supply
includes an overvoltage protection circuit, to assure that neither power
supply’s output will significantly exceed the nominal output voltage
rating under any condition, including incorrect connection and adjustment.
Serviceability: Either power supply can be easily, safely
and rapidly changed while the other supply continues to provide uninterrupted
power to the load.
Alarm Circuits: The failure alarm circuits operate relays,
the contacts of which are available to control external failure alarms or
other circuitry. The contact wiring of the two relays is connected in cascade,
to simulate a single set of Form C contacts which switch if the output of
either power supply decreases by more than 2 volts from the nominal rating
(4 volts for 50 to 125 volt models).
Input Redundancy: All Pluggable Redundant Power Packages
may be operated with only one AC power source. However, two isolated sets
of AC input connections are provided, so that two independent sources of
AC input power may be used, to obtain the additional benefit of input power
redundancy. By feeding one input through a battery-backup power source (UPS),
DC output power will be maintained even if both AC power sources should
Overvoltage Protection: Automatic recovery. Each power supply contains
an overvoltage protection circuit, to assure that neither power supply
output will significantly exceed the nominal output voltage rating under
any condition, including incorrect application and misadjustment.
Switching Regulated PLUGGABLE REDUNDANT POWER PACKAGES