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Pluggable Redundant Power Packages

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Pluggable Redundant Power Packages


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 output terminals.

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 fail.