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公开(公告)号：US20230387827A1
公开(公告)日：2023-11-30
申请号：US18306569
申请日：2023-04-25
发明人： Kazuhiro FUJIOKA , Yoshiaki Ishiguro , Ryota Kondo
IPC分类号： H02M7/5395 , H02M7/48 , H02M1/00
CPC分类号： H02M7/5395 , H02M7/4803 , H02M1/0025 , H02M1/0019
摘要： A setting unit sets a duty ratio of a PWM signal based on a target voltage value, and outputs the duty ratio to a voltage conversion circuit. An estimated value calculation unit cyclically calculates an estimated duty ratio value based on the detected input voltage value and the detected output voltage value. An abnormality detection unit cyclically calculates, as a difference value, a difference between an updated estimated value and a comparison reference value, and detects abnormality of a voltage detection unit based on a change in calculated difference value. The updated estimated value is a newly calculated estimated duty ratio value. The comparison reference value is a value based on the estimated duty ratio value calculated in a cycle prior to a cycle in which the updated estimated value is calculated.
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公开(公告)号：US11682996B2
公开(公告)日：2023-06-20
申请号：US17772145
申请日：2020-01-21
IPC分类号： H02P27/06 , H02K11/33 , H02M7/5387
CPC分类号： H02P27/06 , H02K11/33 , H02M7/5387
摘要： An inverter is provided for driving a motor. A first capacitor, and a second capacitor including capacitors connected in series, are connected in parallel to a DC power supply. A switch circuit having switching elements is connected between the inverter and the second capacitor. A control circuit is provided for controlling the inverter and the switch circuit. The control circuit performs control to switch the switch circuit so as to supply current from the second capacitor to the inverter during 3-level operation, and supply current from both of the first capacitor and the second capacitor to the inverter during 2-level operation.
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公开(公告)号：US12132429B2
公开(公告)日：2024-10-29
申请号：US17783000
申请日：2020-01-15
CPC分类号： H02P27/06 , H02M1/0048 , H02M7/483 , H02M7/537
摘要： A power conversion device and a motor system according to the present disclosure comprises an inverter circuit which is connected to a motor, a switch circuit, and a control circuit. The power conversion device and the motor system are characterized in that the inverter circuit and the switch circuit are capable of two-level operation and three-level operation, and the control circuit switches between the two-level operation and the three-level operation on the basis of the motor torque command and the rotational speed command. As a result, it is possible to reduce the total loss in the power conversion device and the motor.
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