Vertiv Corporation

Kaiyu Wang

Xian Chen

Matthew Elswick

A device may include an rectifier with one or more transistors that accepts a three-phas7 input and generates a DC bus output, a low-pass filter to provide a filtered DC bus voltage, a driver to drive the transistors based on a modulation index, and a controller to generate the modulation index. The controller may generate a nominal modulation index, generate an adjusted modulation index based on the nominal modulation index modified by a ratio of the filtered and measured DC bus voltages, and provide the modulation index to the PWM driver, where the modulation index is the nominal modulation index when a difference voltage associated with a difference between the filtered and measured DC bus voltages is below a voltage threshold, and where the modulation index is the adjusted modulation index when the difference voltage is above the voltage threshold.

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Rochester Hills, MI, United States of America

Kaiyu Wang