Vertiv Corporation

Vertiv S.r.l.

Edwin Shires

Brian Paul Heber

Terry Dwane Bush

Charles F Blair

Marco Bonora

Ugo Cinti

Guerino Vassallo

Matteo Lo Torto

Gianni Dipietrangelo

A common mode choke in a 3-wire transformer free UPS system with which different rectifier and bypass power sources are used is eliminated by using different types of PWM control depending on whether the inverter is paralleled with the bypass power source. When the inverter is paralleled with the bypass power source, a type of PWM control is used that does not have common mode voltage injection. When the inverter is not paralleled with the bypass power source, a type of PWM control is used that has common mode voltage injection. In an aspect, the PWM control that does not have common mode voltage injection is sine-triangle PWM and the PWM control that has common mode voltage injection is space-vector PWM.

3-wire transformer-free UPS system and method of control to reduce common mode current

An uninterruptible power supply system has a three-level T-Type inverter A method that improves clearing a short of a load coupled to an output of the inverter when the load experiences a short circuit event includes commutating with a controller each phase of the inverter in a two level mode current generation when output voltage and output current of that phase have the same direction and commutating each phase of the inverter in a three level mode current generation when the output voltage and output current of that phase have opposite directions.

Method of controlling an uninterruptible power supply to clear a shorted load

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Powell, OH, United States of America

Edwin Shires