公开(公告)号：US20210336549A1

公开(公告)日：2021-10-28

申请号：US17241073

申请日：2021-04-27

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Hirotaka KARAKAMA ,  Hidenori HARA ,  Masashiro TANAKA ,  Mitsugu TAJIMA ,  Yoichi YANO

IPC: H02M5/44 ,  H02M1/12

Abstract: A power conversion apparatus includes: matrix converter circuitry to perform power conversion between a primary side electric power and a secondary side electric power; rectifier circuitry to convert the primary side electric power to charge a capacitor; and control circuitry to: set a changeover reference voltage at a first reference voltage when the primary side voltage magnitude is a first voltage magnitude and set the changeover reference voltage at a second reference voltage when the primary side voltage magnitude is a second voltage magnitude; and select, based on the changeover reference voltage and the terminal voltage, a connection state from: a first connection state in which the rectifier circuitry is connected to the capacitor by a first route including a current limit device; and a second connection state in which the rectifier circuitry is connected to the capacitor by a second route that bypasses the current limit device.

公开(公告)号：US20230032286A1

公开(公告)日：2023-02-02

申请号：US17757865

申请日：2020-11-16

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Toshihiro HANADA ,  Shoji KONAKAHARA ,  Keisei INOKI ,  Masashiro TANAKA

IPC: H02M5/293 ,  H02M1/00 ,  H02M5/297

Abstract: A power conversion device 1 includes a matrix converter circuit 10 including a plurality of switching elements and being configured to perform bidirectional power conversion between alternating current power on a primary side and alternating current power on a secondary side, a power conversion control unit 114 configured to switch on and off the plurality of switching elements in unison with a carrier wave to cause an alternating current on the secondary side to follow a control command, and a carrier wave changing unit 116 configured to change, based on a nearness level between a frequency on the primary side and a frequency on the secondary side, a frequency of the carrier wave.

公开(公告)号：US20220069721A1

公开(公告)日：2022-03-03

申请号：US17460331

申请日：2021-08-30

Applicant: KABUSHIKI KAISHA YASKAWA DENKI

Inventor： Hirotaka KARAKAMA ,  Takahiro UCHINO ,  Keisei INOKI ,  Masashiro TANAKA

IPC: H02M3/335 ,  H02M1/084

Abstract: A power conversion apparatus includes: matrix converter circuitry configured to perform bidirectional power conversion between a primary side and a secondary side; and control circuitry configured to: select a first control mode in response to determining that a command-primary frequency difference between a command frequency and a primary side frequency of the matrix converter circuitry is above a predetermined threshold, wherein the first control mode includes causing a secondary side frequency of the matrix converter circuitry to follow the command frequency; select a second control mode in response to determining that the command-primary frequency difference is below the threshold, wherein the second control mode includes maintaining a primary-secondary phase difference between a secondary side phase and a primary side phase of the matrix converter circuitry within a predetermined target range; and control the matrix converter circuitry in accordance with a selection of the first control mode or the second control mode.