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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
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.
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公开(公告)号：US20220069724A1
公开(公告)日：2022-03-03
申请号：US17460334
申请日：2021-08-30
Applicant: KABUSHIKI KAISHA YASKAWA DENKI
Inventor： Hirotaka KARAKAMA , Keisei INOKI , Yoichi YANO , Takahiro UCHINO , Toshihiro HANADA
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: calculate a deterioration level based on a secondary side current of the matrix converter circuitry, a carrier frequency, and a primary-secondary frequency difference between a primary side frequency and a secondary side frequency of the matrix converter circuitry; and output a deterioration notification in response to determining that the deterioration level exceeds a predetermined level.
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