A modular uninterruptible power supply is disclosed, which provides complete redundancy for all components required for UPS operation. Novel aspects of the invention include design of the modules and their interconnection and interoperability, as well as improved operation techniques applicable to UPS...http://www.google.com/patents/US20040160214?utm_source=gb-gplus-sharePatent US20040160214 - MODULAR UNINTERRUPTIBLE POWER SUPPLY
