公开(公告)号：US09950627B2

公开(公告)日：2018-04-24

申请号：US15033132

申请日：2014-10-14

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Sho Yaegaki ,  Hiroshi Tamura ,  Takeshi Matsuo ,  Hiroyuki Yamada ,  Nobuhiro Akasaka

IPC: B60L11/02 ,  B60L3/00 ,  H02M1/08 ,  H02M3/155 ,  H02M3/158 ,  H02M7/48 ,  B60L11/18 ,  H02M7/537 ,  B60L11/12 ,  H02M7/5387 ,  H02M7/5395 ,  H02M1/00 ,  H02M1/32

CPC classification number: B60L11/02 ,  B60L3/003 ,  B60L11/123 ,  B60L11/1809 ,  B60L2210/14 ,  B60L2240/525 ,  H02M1/08 ,  H02M3/155 ,  H02M3/1588 ,  H02M7/48 ,  H02M7/537 ,  H02M7/5387 ,  H02M7/5395 ,  H02M2001/0009 ,  H02M2001/007 ,  H02M2001/322 ,  H02M2001/327 ,  Y02T10/6217 ,  Y02T10/7005 ,  Y02T10/7022 ,  Y02T10/7077 ,  Y02T10/7225

Abstract: An object is to reduce a discharging time required for discharging residual charges of a capacitor. A power conversion device according to the present invention includes: an inverter circuit unit; a step-up circuit unit; a smoothing capacitor; and a step-up circuit control unit which controls the step-up circuit unit, wherein the step-up circuit unit has a first switching element, a second switching element connected electrically in series to the first switching element, and a reactor having a conducting current controlled by switching operation of the first switching element and the second switching element, and the step-up circuit control unit has a first control mode of controlling the switching operation of the first switching element and the second switching element by changing a duty command value and outputting a stepped up voltage from the step-up circuit unit, and a discharge control mode of discharging electric charges stored in the smoothing capacitor into the reactor, with the duty command value fixed to a predetermined value.

公开(公告)号：US09906164B2

公开(公告)日：2018-02-27

申请号：US15115275

申请日：2014-12-08

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Hiroshi Tamura ,  Takeshi Matsuo ,  Hiroyuki Yamada ,  Nobuhiro Akasaka ,  Sho Yaegaki

IPC: H02M7/537 ,  B60L11/12 ,  B60L11/14 ,  B60L15/00 ,  B60L15/02 ,  H02M1/14 ,  H02M7/797 ,  H02P29/50 ,  B60L3/00 ,  B60L9/18 ,  H02P27/06 ,  H02M7/48 ,  H02P27/08 ,  H02P8/18 ,  H02P6/10 ,  H02M1/00 ,  H02P5/74

CPC classification number: H02M7/537 ,  B60L3/003 ,  B60L11/12 ,  B60L11/14 ,  B60L15/007 ,  B60L15/025 ,  B60L2210/14 ,  B60L2210/30 ,  B60L2210/40 ,  B60L2240/526 ,  B60L2240/527 ,  B60L2240/529 ,  H02M1/14 ,  H02M7/48 ,  H02M7/797 ,  H02M2001/007 ,  H02M2001/008 ,  H02P5/74 ,  H02P6/10 ,  H02P8/18 ,  H02P27/06 ,  H02P27/08 ,  H02P29/50 ,  Y02T10/643 ,  Y02T10/7022 ,  Y02T10/7077 ,  Y02T10/7225 ,  Y02T10/7241

Abstract: A surge according to a change of a switching state can be reduced without increasing a torque ripple of a motor. A first switching signal to control switching of a boost converter is generated on the basis of a comparison of a first duty command value and a first triangular wave carrier of the boost converter. A second switching signal to control switching of an inverter is generated on the basis of a comparison of a second duty command value and a second triangular wave carrier of the inverter. In addition, the second triangular wave carrier is generated such that a frequency of the second triangular wave carrier becomes equal to a frequency of the first triangular wave carrier and a phase of the second triangular wave carrier is different from a phase of the first triangular wave carrier by 180 degrees.

公开(公告)号：US11050353B2

公开(公告)日：2021-06-29

申请号：US16620000

申请日：2018-04-11

Applicant: Hitachi Automotive Systems, Ltd.

Inventor： Sho Yaegaki ,  Kenji Kubo ,  Takuma Ono ,  Yuki Yamabe

IPC: H02M3/00 ,  H02M3/335 ,  B60R16/02 ,  H02M1/088 ,  H02M1/32

Abstract: A power conversion device capable of suppressing current backflow while also improving current responsiveness and power conversion efficiency is achieved. A snubber capacitor capable of absorbing switching surge is connected to a low-voltage side switching circuit that includes switching elements. Until a predetermined time elapses from when a request to start switching is received, a controller determines that the snubber capacitor has not reached full charge or near-full charge, and asynchronously controls the low-voltage side switching circuit and a high-voltage side switching circuit that includes switching elements. After the predetermined time elapses, the controller synchronously controls the low-voltage side switching circuit and the high-voltage side switching circuit, and also controls a duty ratio of the low-voltage side switching circuit and the high-voltage side switching circuit such that current does not flow back from the low-voltage side switching circuit to the high-voltage side switching circuit.