Nested redundant uninterruptible power supply apparatus and methods

摘要

An uninterruptible power supply (UPS) system (200) includes at least three UPSs (214) configured to be connected in parallel to a common load (20). The system further includes control circuitry (212) configured to support at least two redundant groups among the UPSs and to support at least two redundant subgroups among at least one of the redundant groups of UPSs. In this manner, a nested redundancy may be provided.