Patents by Inventor Shunsuke TAMADA
Shunsuke TAMADA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11211876Abstract: A voltage compensation device according to an embodiment includes a controller including first and second coordinate transformation circuits, and first and second arithmetic parts. The first coordinate transformation circuit generates first and second outputs that are mutually-orthogonal by performing a rotating coordinate transformation of the normal-phase components of a three phase AC. The first arithmetic part calculates a system voltage based on a DC component of the first output and generates a first compensation amount corresponding to a compensation voltage set to compensate a shift of the system voltage from a preset target voltage. The second coordinate transformation circuit generates third and fourth outputs that are mutually-orthogonal by performing a rotating coordinate transformation of reverse-phase components of the three-phase AC.Type: GrantFiled: September 3, 2018Date of Patent: December 28, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Shunsuke Tamada, Yuji Watanabe
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Publication number: 20210194380Abstract: A voltage compensation device according to an embodiment includes a power converter, series transformers and a controller. The controller includes a first coordinate transformation circuit, a first arithmetic part, a second coordinate transformation circuit and a second arithmetic part. The first coordinate transformation circuit generates a first output and a second output that are mutually-orthogonal by performing a rotating coordinate transformation of the normal-phase components of a three phase alternate current. The first arithmetic part calculates a system voltage based on a direct current component of the first output and generates a first compensation amount corresponding to a compensation voltage set to compensate a shift of the system voltage from a preset target voltage.Type: ApplicationFiled: September 3, 2018Publication date: June 24, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATIONInventors: Shunsuke TAMADA, Yuji WATANABE
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Patent number: 10938319Abstract: According to an embodiment, there is provided an apparatus which can hold down an energy loss and can avoid an increase in size. The apparatus includes a cell including a floating capacitor connected in parallel to an upper-side switching element and a lower-side switching element; an upper arm include including first switch circuits, each including a first switching element, a first diode and a first capacitor, are connected in series; a lower arm including second switch circuits, each including a second switching element, a second diode and a second capacitor, are connected in series; and a circuit which connects a low-side terminal of the cell and a low-side terminal of the first capacitor and connects a high-side terminal of the cell and a high-side terminal of the second capacitor.Type: GrantFiled: July 17, 2020Date of Patent: March 2, 2021Assignee: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji Maki, Hiroshi Mochikawa, Yushi Koyama, Shunsuke Tamada, Takuro Arai, Ryuichi Morikawa, Mami Mizutani
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Publication number: 20200350832Abstract: According to an embodiment, there is provided an apparatus which can hold down an energy loss and can avoid an increase in size. The apparatus includes a cell including a floating capacitor connected in parallel to an upper-side switching element and a lower-side switching element; an upper arm include including first switch circuits, each including a first switching element, a first diode and a first capacitor, are connected in series; a lower arm including second switch circuits, each including a second switching element, a second diode and a second capacitor, are connected in series; and a circuit which connects a low-side terminal of the cell and a low-side terminal of the first capacitor and connects a high-side terminal of the cell and a high-side terminal of the second capacitor.Type: ApplicationFiled: July 17, 2020Publication date: November 5, 2020Applicant: Toshiba Infrastructure Systems & Solutions CorporationInventors: Koji MAKI, Hiroshi Mochikawa, Yushi Koyama, Shunsuke Tamada, Takuro Arai, Ryuichi Morikawa, Mami Mizutani
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Patent number: 9722507Abstract: An electric power conversion apparatus according to an embodiment includes, wherein when a constituent element constituted of a leg in which two switching elements provided with self-arc-extinguishing capability are connected in series, and a capacitor connected in parallel with the leg is made a converter unit, and a constituent element formed by connecting one or more converter units in series is made a phase arm, a phase arm on the positive side, a single-phase four-winding transformer, and a phase arm on the negative side are included in each of three phases, one end of the phase arm on the positive side is connected to the positive side of a secondary winding of the four-winding transformer, and the other end thereof is connected to a DC positive side terminal.Type: GrantFiled: May 1, 2015Date of Patent: August 1, 2017Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Yosuke Nakazawa, Takeru Murao, Shunsuke Tamada
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Publication number: 20150236611Abstract: An electric power conversion apparatus according to an embodiment includes, wherein when a constituent element constituted of a leg in which two switching elements provided with self-arc-extinguishing capability are connected in series, and a capacitor connected in parallel with the leg is made a converter unit, and a constituent element formed by connecting one or more converter units in series is made a phase arm, a phase arm on the positive side, a single-phase four-winding transformer, and a phase arm on the negative side are included in each of three phases, one end of the phase arm on the positive side is connected to the positive side of a secondary winding of the four-winding transformer, and the other end thereof is connected to a DC positive side terminal.Type: ApplicationFiled: May 1, 2015Publication date: August 20, 2015Applicant: Kabushiki Kaisha ToshibaInventors: Yosuke NAKAZAWA, Takeru MURAO, Shunsuke TAMADA