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Рис. ABB
True redundancy using a CP-A RU

For true redundancy it is necessary to provide decoupling of the individual power supplies.
Otherwise, the failed power supply could possibly act as a load for the other power supply or, in the worst case, cause a short circuit on the secondary side resulting in a failure of the second power supply.
Decoupling of the power supplies has to be performed by connecting decoupling diodes (so called O-ring diodes) to the secondary outputs. These diodes prevent mutual loading of the power supplies in case of a fault and thus guarantee continuous supply.
For the setup of redundant power supply systems, ABB offers two redundancy units, the CP-RUD (for output currents of up to 5 A) and the CP-A RU (for output currents of up to 40 A). The inputs of these units are connected to the terminals L+ and L- of the power supplies (many other manufacturers often consider L+ only). The loads are supplied directly from the outputs of the redundancy unit.
[ABB]

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источники и системы электропитания

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true redundancy

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