Multilevel Power Conversion Circuit and Device
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Sep 9, 2013
filing date -
Sep 13, 2012
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[Solution] An actually used flying capacitor-type multilevel power conversion circuit has variations in the characteristics of main semiconductor switches, and includes parasitic elements such as parasitic resistance, parasitic capacity, and parasitic inductance in the circuit, which causes flying capacitors to be charged and discharged to different quantities contrary to ideal case, making it necessary to have voltage sensors for flying capacitor voltage detection and a main semiconductor switch control mechanism in order to suppress fluctuation of the flying capacitor voltages from prescribed values. Furthermore, this circuit becomes unpractical when the number of levels is increased. The present invention provides a circuit that adjusts flying capacitor voltages to prescribed values automatically without voltage sensors for detection of individual flying capacitor voltages, and a main semiconductor switch control mechanism, by additionally providing a main circuit thereof with a closed circuit for suppressing flying capacitor voltage fluctuations by means of an adjusting current.
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