General Electric Company

Nicolas Borgeaud

Silvio Colombi

Chris Van Kalken

An Intelligent Synchronization Module (ISM) for an Uninterruptible Power Supply (UPS) system for servicing a load is disclosed. The UPS system has at least one of a first UPS group and a second separate and independent UPS group, each of the first and second UPS groups having a master UPS. The ISM has a processing circuit and a storage medium, readable by the processing circuit, storing instructions for execution by the processing circuit for: assigning the first UPS group the role of master group and the second UPS group the role of slave group; and, passing phase information relating to the master group to the slave group, thereby enabling the master UPS of the slave group to effect synchronization with the master group.

Apparatus for synchronizing uninterruptible power supplies

A method and apparatus for modulating a discontinuous conduction mode (DCM) Boost Rectifier having a switchable booster section is disclosed. A modulation signal is defined according to the equation, T(&#x3c6;)=f1(&#x3c6;)+f2(&#x3c6;)+f3(&#x3c6;). Here, &#x3c6; defines a phase angle for an input phase voltage of the DCM Boost Rectifier; T(&#x3c6;) defines a modulation characteristic for an ON time of the booster section, and is a continuous function; f1(&#x3c6;) defines a first function from 0&#x2266;&#x3c6;&#x2266;&#x3c0;/3; f2(&#x3c6;) defines a second function from &#x3c0;/3&#x2266;&#x3c6;&#x2266;2&#x3c0;/3; and, f3(&#x3c6;) defines a third function from 2&#x3c0;/3&#x2266;&#x3c6;&#x2266;&#x3c0;. The switchable booster section is then modulated using the modulation signal.

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Breganzona, Switzerland

Nicolas Borgeaud