Liebert Corporation

Mohammad Nanda Rahmana Marwali

Brian Paul Heber

Kevin Kim Eschhofen

Terry Dwane Bush

Russell Edward Shetler, Jr

Suratkal Padmanabha Shenoy

Ronald Richard Rautenstrauch

Andy Margraff

Ramesh Subramanian

Jon Ross Funk

Kevin Jay Bell

Nelson John Norris

Farzin Kafaipour

A method for pulse width modulated pulse synchronization in a parallel UPS system uses the locally measured critical bus voltage to detect a zero crossing and adjust the PWM pulse to coincide with the zero crossing. No communication between the units is required to perform synchronization, and no 'master' and 'slave' relationship exists to thereby increase the total system reliability.

Method for pulse width modulation synchronization in a parallel UPS system

An uninterruptible power supply is disclosed that includes a digital controller comprising a plurality of microprocessors. These microprocessors are programmed and arranged to provide various control features heretofore unavailable using analog controllers of the prior art.

Uninterruptible power supply

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Lewis Center, OH, United States of America

Mohammad Nanda Rahmana Marwali