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公开(公告)号：US11929689B2
公开(公告)日：2024-03-12
申请号：US17631722
申请日：2019-09-13
发明人： Ryoji Tsuruta , Hiroshi Masunaga , Tomohiro Tanaka
IPC分类号： H02M7/538 , H02M1/00 , H02M1/08 , H02M1/38 , H02M7/5387
CPC分类号： H02M7/53871 , H02M1/0009 , H02M1/08 , H02M1/38
摘要： A power conversion device includes: a dead time application unit which applies a dead time to only one of a pair of pulse signals; a current polarity detection unit which detects a polarity of an output current; and a gate signal selection unit which, if the polarity of the output current is positive, selects the one pulse signal, to which the dead time has been applied, as a gate signal for a positive arm and selects the other pulse signal as a gate signal for a negative arm, and, if the polarity of the output current is negative, selects the one pulse signal, to which the dead time has been applied, as the gate signal for the negative arm and selects the other pulse signal as the gate signal for the positive arm.
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公开(公告)号：US11843327B2
公开(公告)日：2023-12-12
申请号：US17312198
申请日：2019-09-05
发明人： Nobuyuki Momochi , Tomohiro Tanaka
IPC分类号： H02M7/5395 , H02M7/5387
CPC分类号： H02M7/5395 , H02M7/5387
摘要： A power conversion device includes: an inverter that includes a switching element and converts DC power into AC power; a current detector that detects an output current of the inverter; and a controller that controls the inverter to allow the output current detected by the current detector to follow a current command value having a sinusoidal waveform. The controller compares a current deviation of the output current from the current command value with a hysteresis band to control switching of the switching element. The controller sets the hysteresis band so that a hysteresis band in a zero-crossing area of the current command value is smaller than a hysteresis band in a peak area of the current command value.
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公开(公告)号：US11277077B2
公开(公告)日：2022-03-15
申请号：US16771007
申请日：2018-10-30
发明人： Tomohiro Tanaka
IPC分类号： H02M7/5387 , H02M1/12 , H02M7/5395 , H02M7/48
摘要： A power conversion device includes: a three-phase inverter including a plurality of switching elements; and a controller configured to PWM-control the three-phase inverter based on three phase voltage commands. The controller generates a zero-phase voltage command using a two-phase modulation scheme and a third harmonic component of the three phase voltage commands. The controller adds the generated zero-phase voltage command to each of the three phase voltage commands to thereby correct each of the three phase voltage commands. The controller compares each of the corrected three phase voltage commands with a carrier wave, to thereby generate a control signal for controlling switching of the plurality of switching elements.
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