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Abstract: This paper proposes a modular configuration of battery back-up unit (BBU) for data centers. The proposed configuration is based on the concept of battery power module (BPM) where the battery cells are decoupled from each other by connecting each cell with a low bi-directional DC-DC power converter.
These are the following: Battery pack capacity: The BBU module can provide 3 kW backup power not more than 4 mins over a period of 4 years. Battery cell type: The BBU module should have a Li-Ion 18650 type with 3.5 V to 4.2 V cell voltage, a minimum of 1.5 AH battery capacity, and a 30 A continuous rated discharge current.
Designed for deployment on a BBU Shelf within a data center rack, a Battery Back-up Unit (BBU) serves the purpose of supplying DC power to system loads in the event of sudden power interruptions. OCP has established a set of design requirements and specifications for the BBU reference design standard.
Aside from power conversion ICs, the BBU module incorporates the MAX32690, an ultra low power Arm ® microcontroller, responsible for overall system operation. The LTC2971, a 2-channel power system manager, is used for precision sensing and fault detection of the power path, as well as a crucial voltage droop function.
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