VOLTAGE BALANCE CONTROLLER AND VOLTAGE BALANCE CONTROL METHOD FOR FLYING CAPACITOR MULTILEVEL CONVERTER

摘要

PROBLEM TO BE SOLVED: To provide a voltage balance controller and a voltage balance control method for flying capacitor multilevel converter.;SOLUTION: A current direction prediction unit acquires the voltage change amount of a selected flying capacitor of a flying capacitor multilevel converter, and receives feedback signals of two adjoining switch elements corresponding to the selected flying capacitor. Calculation results are generated, based on the average value or cumulative value of feedback signals in an adjustment period. After multiplication and/or division of the voltage change amount and calculation results are executed, current direction is predicted based on the obtained code. As a result, voltage balance of the flying capacitor of a flying capacitor multilevel converter is realized.;SELECTED DRAWING: None;COPYRIGHT: (C)2018,JPO&INPIT