Sumitomo Electric Industries, Limited

Olympus Optical Company, Ltd.

Mitsubishi Electric Corporation

Kabushiki Kaisha Toshiba

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Oji Paper Co., Ltd.

Olympus Corporation

Sony Corporation

Toyota Jidosha Kabushiki Kaisha

Nippondenso Co., Ltd.

Showa Denko K.k.

Toyota Jidosha Kogyo Kabushiki Kaisha

Olympus Imaging Corporation

Showa Denko Kabushiki Kaisha

Shigeo Hayashi

Mitsuaki Nishie

Takeshi Ito

Ryosuke Uda

Koichiro Takeguchi

Yoshiki Kuhara

Shuhei Fujiwara

Yoshiyuki Kono

Toshiyuki Fujii

Takuya Kajiyama

Kazuhiro Satoh

Tatsuo Takanashi

Yukio Kusaka

Kousaku Nishio

Tatsuya Takahashi

Hirotaka Oomori

Yasuo Yamazaki

Toshikazu Onishi

Hiroshi Akitake

Issei Takahashi

Hideki Watanabe

Toshikazu Nagura

Koji Narita

Hiroki Hirai

Toshiaki Kakii

Akira Watanabe

Hiroyuki Nemoto

Yoshio Fujiwara

Tamotsu Koiwai

Takeshi Kikuchi

Masaru Kato

Moriya Katagiri

Satoshi Yoshikawa

Hideki Goto

Naoki Fujii

Yukihiko Sugita

Toshiyuki Toyofuku

Moriyasu Ichino

Norio Shibata

Hiroki Kobayashi

Yoshikazu Isoyama

Kunio Yokoyama

Kazuyori Tahata

Hayato Yuuki

Huy Sam

Kenichi Kuroda

Manabu Kagami

Yasuo Takahara

Masashi Kitayama

Masaaki Daigaku

Yoshinori Nakamura

Akihiro Hashimoto

Fuminori Ueno

Toshihiro Minato

Mitsuru Toyama

Fuminori Nakamura

Takaharu Miura

Kenichiro Uchida

Takeshi Nakane

Naohiro Kageyama

Fumio Matsui

Toyohiko Kimura

Yasuo Isashi

Manabu Yoshii

Ryota Onishi

Yasunari Shimazaki

Hideto Kitazawa

Sayoko Okabe

Seigo Takai

Yasuteru Yamauchi

Katsuya Ota

Akio Mishiba

Osamu Kohari

Rumiko Kamimura

Sadao Yamamoto

Hitoshi Chujo

Eiji Komada

Shizuo Yamada

Haruki Yoneda

Hidenori Akita

Nobuharu Araoka

Ryuichi Kisaka

Naoki Fuji

In an MMC-type power conversion device, a control device calculates an evaluation value representing the degree of variations in voltage of capacitors of individual converter cells. When this evaluation value exceeds a threshold value, the control device controls the converter cells as follows: (i) when current in a positive direction flows through a first converter cell with a voltage of the capacitor greater than a mean value, reducing an output time of positive voltage, (ii) when current in a negative direction flows through the first converter cell, increasing an output time of positive voltage, (iii) when current in the positive direction flows through a second converter cell with a voltage of the capacitor smaller than a mean value, increasing an output time of positive voltage, or (iv) when current in the negative direction flows through the second converter cell, reducing an output time of positive voltage.

Capacitor balancing control in an HVDC MMC

A voltage evaluation value generator receives voltage detection values of power storage elements of all of converter cells included in a power converter and generates a first voltage evaluation value of each power storage element of all of the converter cells and a second voltage evaluation value of each power storage element in a plurality of converter cells included in each of a plurality of groups obtained by classifying all of the converter cells in advance, without using a mean value of voltage detection values. A voltage macro controller uses the voltage evaluation value to calculate a control value set in common to at least the converter cells in the same group for controlling deficiency and excess of stored energy in all of the converter cells and the converter cells in each group.

Power conversion device

A voltage generated in a DC line at the time when a sub module is deactivated in the event of a short-circuiting fault in the DC line is suppressed. A power conversion system includes a power converter including a leg circuit, a control device, and a voltage suppression circuit connected to a DC line. The leg circuit includes a plurality of sub modules connected in series, and at least one of them is a first sub module implemented by a sub module in a full-bridge configuration or a 1.5 half-bridge configuration. When the control device detects a short-circuiting fault in the DC line, it stops a switching operation of the plurality of sub modules. The voltage suppression circuit is configured to suppress a voltage generated in the DC line when the switching operation is stopped.

Power conversion system

A power conversion device includes a power converter including a plurality of arms each having a plurality of converter cells connected to each other in cascade. Each converter cell includes a capacitor electrically connected to input/output terminals through a plurality of switching elements. A control device performs AC current control in accordance with a deviation between a detected AC current and an AC current command value and individual voltage control in accordance with a deviation between a voltage of each individual capacitor and an individual voltage command value. The control device calculates an evaluation value indicating the degree of variations in voltage of the individual capacitors. When the evaluation value is greater than a threshold value, the control device changes control of the power converter such that arm current flowing through each of the arms increases while the AC current control and the individual voltage control are being performed.

Power conversion device with individual cell and arm balancing

A power conversion device that converts electric power between a DC circuit and an AC circuit includes a leg circuit including a plurality of sub modules connected in series. A first sub module of the plurality of sub modules includes a first energy accumulation element, a first semiconductor circuit including two switching elements connected in series, and a second semiconductor circuit. The second semiconductor circuit includes a series circuit including a switching element and a semiconductor element connected in series, a second energy accumulation element connected in parallel to the series circuit, and an element including a resistive component connected in series to a parallel circuit including the series circuit and the second energy accumulation element.

Power conversion device that converts electric power between DC circuit and AC circuit

A power converter includes at least one arm having a plurality of converter cells cascaded to each other. Each of the converter cells includes a pair of input/output terminals, a plurality of switching elements, and a power storage element. The power storage element is electrically connected to the input/output terminals through the switching elements. A control device generates a control signal for controlling on and off of the switching elements of each converter cell. The control device generates the control signal by pulse width modulation control based on a modulation command signal including an AC component having a fundamental frequency and corresponding to a command value of an output voltage between the input/output terminals, in each converter cell, such that a harmonic component included in the output voltage and having a predetermined frequency that is an integer multiple of the fundamental frequency is suppressed.

A power conversion system includes: a self-excited power converter to perform power conversion between a first AC system and a DC system; a first transformer having a primary side connected to the first AC system and a secondary side connected to the self-excited power converter; and a first impedance circuit connected between a ground and a neutral point on the secondary side of the first transformer, or between the ground and an AC line connecting the secondary side of the first transformer and the self-excited power converter. The first impedance circuit includes one of a reactor and another transformer.

A power conversion device includes a conversion circuit constituted of a plurality of arm circuits and a bypass circuit. The bypass circuit includes a full-wave rectification circuit, a positive-side connection arm, and a negative-side connection arm. The full-wave rectification circuit is connected between a plurality of AC connections, a positive-side intermediate node, and a negative-side intermediate node, and configured to convert AC voltages generated at the plurality of AC connections into a DC voltage across the positive-side intermediate node and the negative-side intermediate node and output the DC voltage. The positive-side connection arm blocks a current in a direction from a positive-side DC terminal toward the positive-side intermediate node. The negative-side connection arm is connected between the negative-side intermediate node and a negative-side DC terminal and blocks a current in a direction from the negative-side intermediate node toward a negative-side DC terminal.

A power conversion device according to one embodiment includes a plurality of submodules connected in series to each other. In each submodule, a first terminal, a second terminal and a third terminal are provided on or provided to protrude from a surface of a package. A first semiconductor switching element is built into the package and connected between the first terminal and the second terminal. A second semiconductor switching element is built into the package and connected between the second terminal and the third terminal. A DC capacitor is built into the package and connected between the first terminal and the third terminal.

A power conversion device includes a plurality of cascaded converter cells. In each of the converter cells, each of a plurality of arms forming a bridge circuit is provided with a plurality of semiconductor switching elements in parallel. A drive controller of each of the converter cells is configured to, when none of a plurality of predetermined abnormality modes is detected, control the bridge circuit in accordance with an externally provided command. The drive controller is configured to, when at least one of the plurality of abnormality modes is detected, turn on all semiconductor switching elements provided in at least one of the plurality of arms forming the bridge circuit, to thereby establish a short circuit between first and second input/output nodes.

A control system configured to reduce the number of terminals of a connector in an electronic control unit and reduce the insertion/extraction force of the connector includes an ECU having a first connector unit, and a wire harness unit having a second connector unit to be connected to the first connector unit. The ECU includes a multiplexing control circuit and a first signal line serving as a transmission path for a multiplexed signal. The second connector unit is provided with a second signal line serving as a transmission path for the multiplexed signal transmitted via the first signal line, and a multiplexing control circuit. The multiplexing control circuit performs at least one of a process of separating signals from the multiplexed signal transmitted via the second signal line and a process of multiplexing a plurality of signals and transmitting a multiplexed signal to the second signal line.

Control system

Each arm circuit of a power conversion device includes a plurality of cascaded cell blocks and a plurality of bypass circuits connected in parallel to the respective cell blocks. Each cell block includes: a first connection node on a high potential side and a second connection node on a low potential side for connection to another cell block; and a plurality of converter cells cascaded between the first and second connection nodes, each converter cell containing an energy storage. The plurality of converter cells include at least one first converter cell of a full-bridge (or hybrid) configuration and at least one second converter cell of a half-bridge configuration.

Power conversion device having bypass circuit protection

According to an embodiment, a computer system includes a main device, a first computer unit and a second computer unit. The main device includes a first accommodation portion and a second accommodation portion. The main device includes a selector switch, a first selector, a second selector and a control circuit. The first selector conducts either one of first signal lines extended from the first accommodation portion or the second accommodation portion. The second selector conducts either one of second signal lines extended from the first accommodation portion or the second accommodation portion. The control circuit controls the first selector and the second selector by the selector switch.

Computer system and electronic apparatus

A multilevel converter includes a first arm connected between a positive voltage terminal and an alternating-current terminal and a second arm connected between the alternating-current terminal and a negative voltage terminal. Each of the first and second arms includes a plurality of cascaded unit cells. Each unit cell has a capacitor charged to a direct-current voltage and outputs a voltage across terminals of the capacitor or 0 V. The plurality of unit cells as being helically cascaded implement a reactor.

AC-DC power conversion device including helically cascaded unit cells

According to one embodiment, an electronic device includes a housing, an antenna, and a sheet metal member. The antenna is contained in the housing with a gap formed between the antenna and the housing. The sheet metal member is supporting the antenna to be thermally connected with the antenna.

Electronic device

Growing community of inventors

Tokyo, Japan

Shigeo Hayashi