How To Design a Redundant Power Supply Solution (2024)

  • How To Design a Redundant Power Supply Solution

How To Design a Redundant Power Supply Solution

How To Design a Redundant Power Supply Solution (1)

Don’t let the failure of one DC power supply shut down your production line. With PULS, enable power redundancy easily and load share betweenpower suppliesto ensure uninterrupted power to your critical loads.

Power supplies can be paralleled for redundancy to gain higher system availability, however, it’s not as simple as just that. A redundant system requires a certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two decoupled power supplies in parallel; known as 1+1 redundancy. In case one power supply unit fails, the other one is automatically able to support the load current without any interruption. Redundant systems for a higher power demand are usually built in an N+1 method. E.g. five power supplies, with each rate for 10A are paralleled to build a 40A redundant system. It is ‘recommended to use a redundancy module to decouple power supplies from each other. This prevents a defective unit from becoming a load for the other power supplies resulting in the output voltage not being able to be maintained by the remaining functional units.

Tips for Building Redundant Power Systems:

  1. Use separate input fuses for each power supply.
  2. Monitor the individual power supply units by a higher-level system. Therefore, use the DC-OK relay contact of the power supply and monitor with a PLC, SCADA or BMS.
  3. It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.How To Design a Redundant Power Supply Solution (2)

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