DRIVE DEVICE FOR SEMICONDUCTOR SWITCHING ELEMENT
PROBLEM TO BE SOLVED: To equalize voltage shares of a plurality of series-connected semiconductor switching elements without feeding back a voltage deviation amount or a potential amount.SOLUTION: A voltage detection circuit 7 detects voltages of two series-connected semiconductor switching elements...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
06.06.2013
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Subjects | |
Online Access | Get full text |
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Summary: | PROBLEM TO BE SOLVED: To equalize voltage shares of a plurality of series-connected semiconductor switching elements without feeding back a voltage deviation amount or a potential amount.SOLUTION: A voltage detection circuit 7 detects voltages of two series-connected semiconductor switching elements A, B by reference to a potential of one semiconductor switching element A, and a comparator 10 compares the voltages of the semiconductor switching elements A, B and feeds back a voltage deviation polarity signal. A timing control arithmetic circuit 12 determines a control direction on the basis of the voltage deviation polarity signal at every switching cycle, adds a fixed amount of controlled variable in the determined control direction to a controlled variable to a gate signal for the next switching cycle, and outputs the resultant controlled variable and holds the resultant controlled variable. A timing control circuit 13 adjusts a timing of change in the gate signal on the basis of the controlled variable. |
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Bibliography: | Application Number: JP20110253427 |