Kabushiki Kaisha Toshiba

Toshiba Infrastructure Systems & Solutions Corporation

Toshiba Energy Systems & Solutions Corporation

Hokkaido Electric Power Company, Inc.

Takuro Arai

Yuji Watanabe

Daichi Suzuki

Yosuke Nakazawa

Hiroshi Mochikawa

Mami Mizutani

Ryuta Hasegawa

Ryuichi Morikawa

Yushi Koyama

Koji Maki

Shunsuke Tamada

Kei Sekiguchi

Akihiko Tachi

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.

Power conversion apparatus

In a voltage adjusting apparatus connected in series to a system, an output of an AC/DC converter thereof is reduced. The apparatus includes a second serial transformer having a primary side connected in series to a secondary side of a first serial transformer having a primary side connected in series between a power supply and a load and to a secondary side of a parallel transformer having a primary side connected in parallel between the power supply and the load; and a first AC/DC converter having an AC side connected to a secondary side of the second serial transformer. The first AC/DC converter has a switching element connected between an AC terminal and a DC terminal, an antiparallel diode, and a capacitor.

Voltage adjusting apparatus

Growing community of inventors

Kodaira, Japan

Takuro Arai