Ricoh Company, Ltd.

Tdk Corporation

Mitsubishi Rayon Company, Limited

Kabushiki Kaisha Toshiba

Audio-Technica Corporation

Olympus Corporation

Jatco Corporation

Genodive Pharma Inc.

Fujitsu General Limited

Kabushiki Kaisha Square Enix

Nissan Motor Company Limited

Kabushiki Kaisha Audio Technica

Square Enix Co., Ltd.

Namiki Precision Jewel Co., Ltd.

Okada, Hiroshi

Shingo Suzuki

Tomoyasu Hirasawa

Hiromitsu Fujiya

Masanori Saitoh

Kenichi Takehara

Satoshi Okano

Yasuaki Iijima

Satoshi Kaneko

Shuji Hirai

Keisuke Yuasa

Katsuo Naoi

Takayuki Nishimura

Sean Bryson

Yoshihiro Kikuchi

Shinji Kato

Koichi Kudo

Jun Yamane

Yuji Kawashima

Hiroshi Okada

Masao Inoue

Keisuke Ikeda

Takahiro Fujimori

Kensaku Asakura

Nobuyuki Yanagawa

Hitoshi Ishibashi

Shinichi Akatsu

Tetsuya Muto

Yuuichiroh Uematsu

Tatsuro Fujisawa

Takashi Shiina

Takashi Sudo

Yasuhiro Kanishima

Kenichi Watanabe

Yoshinobu Takeyama

Hironori Miyaishi

Tetsuya Izumi

Akito Suzuki

Masanori Murakami

Masaki Yamada

Junichi Nakamura

Koji Yamamoto

Hideo Takahashi

Hideo Kanai

Satoshi Takahashi

Daisuke Nishiwaki

Tadashi Amada

Hirofumi Mori

Yoshihiro Ue

Takuma Mitsunaga

Karin Maebashi

Hisakazu Uto

Masao Ichi

Manabu Kagami

Keita Gotoh

Kentaro Takeda

Masatoshi Toda

Takaya Matsuno

Yuki Wada

Shigeki Mitsunaga

Hidetoshi Inoko

Chiaki Suematsu

Kakuzou Kaneko

Kouichi Kotsuji

Taiichi Onoyama

Masumi Fujikawa

Tomoyuki Mizuochi

Keisuke Iwado

Ryuichi Arai

Ryuzo Noguchi

Masayoshi Komiya

Seishi Shimamura

Akihiro Toyofuku

Satoshi Harui

Kiyoshi Hatanaka

Chikashi Sugiura

Tatsunori Saito

Makio Ueno

Jun Ohashi

Masami Morimoto

Yasuhiro Hirobe

Toshiyuki Koga

Takanobu Mouri

Yukio Yata

Satoshi Nonaka

Kiyoshi Ichimura

Yusaku Kikugawa

Masaki Fuse

Masaharu Hirakawa

Kan Yagi

Kazuhiro Miyachi

Hajime Gotoh

Tsugiyoshi Ono

Takahiro Ogino

Toyokazu Itakura

Kenya Okazaki

Osamu Ono

Jun Katou

A power management device includes: a first determination unit that determines whether or not an execution condition for executing cell balancing for equalizing states of charge of a plurality of battery cells included in a storage battery connected to a direct current (DC) bus via a converter is satisfied; and a control unit that performs cell balancing execution control for causing a battery management device managing the storage battery to execute the cell balancing when the execution condition is satisfied. The control unit changes a target voltage of the converter so that a state of charge of the storage battery becomes a state in which the battery management device starts the cell balancing in the cell balancing execution control.

Power management device and power feeding system

An upper power management device includes: an update unit that updates a target value of interest based on a received power value of electric power received by a first power feeding system that is making a power transmission request, and a transmitted power value of electric power transmitted by a second power feeding system that is responding to the power transmission request, the target value of interest including at least one of a power reception target value of an external bus voltage in a first converter of the first power feeding system, and a power transmission target value of the external bus voltage in a second converter of the second power feeding system; and an output unit that outputs a first setting command for setting the power reception target value in the first converter and a second setting command for setting the power transmission target value in the second converter.

Upper power management device, power interchange control method, and recording medium

A power management device includes a control unit that controls a converter capable of bidirectionally converting between an external bus voltage and an internal bus voltage in a first power feeding system. When an amount of stored electric power of the first power feeding system is less than a first storage threshold value, the control unit sets a target value of the external bus voltage to a first power reception target value corresponding to a first transmission power value in a first power transmission request transmitted to an upper power management device. When the amount of stored electric power exceeds a second storage threshold value, the control unit sets the target value of the external bus voltage to a first power transmission target value corresponding to a second transmission power value in a second power transmission request received from a second power feeding system.

Power management device, upper power management device, and power management method

A power management device is a power management device that controls a temperature inside a housing in a power storage system that includes a power storage device including a storage battery and the housing for housing the power storage device. The power management device includes an acquisition unit that acquires status information indicating a status of the power storage system, a calculation unit that calculates a target temperature in the housing based on an allowable capacity deterioration rate of the storage battery, and an air volume control unit that controls an air volume of a fan provided in the housing based on the status information and the target temperature.

Power management device and power storage system

Microphone

Microphone pop filter

Microphone stand

A power feeding system includes a direct current (DC) bus for supplying DC power, a renewable energy power generation device connected to the DC bus, a first converter connected to the DC bus and converting a bus voltage supplied to the DC bus into a load voltage supplied to a load device, a storage battery, a second converter provided between the storage battery and the DC bus and capable of bidirectionally converting the bus voltage and a battery voltage of the storage battery, and a power management device controlling the second converter to charge and discharge the storage battery. The power management device controls the second converter to change the bus voltage based on difference power obtained by subtracting load power supplied to the load device from supply power supplied to the DC bus, the supply power including generated power generated by the renewable energy power generation device.

Power feeding system and power management device

Microphone holder

A DC power supply system includes: a DC bus serving as a bus bar for DC power supply; a natural energy power generatorthat supplies generated power to the DC bus; a plurality of storage batteries that store the generated power from the natural energy power generator; a plurality of bidirectional DC-DC converters that connect the plurality of corresponding storage batteries to the DC bus; a power management apparatus that manages operations of the plurality of bidirectional DC-DC converters; and a target voltage corrector that calculates a correction value of a target value for the output voltage by using an average value of a plurality of actual measurement values of each output voltage of the bidirectional DC-DC converters. The power management apparatus individually controls the each output voltage of the bidirectional DC-DC converters by using each target value of the output voltages corrected based on the correction value.

DC power supply system

Fluctuations in the battery life of a plurality of storage batteries are reduced. A DC power supplying system includes power conditioners that supply generated power of power generators to a DC bus, converters that perform voltage conversion on a bus voltage and supply load power to load appliances, bidirectional converters that execute charging operations that charge storage batteries and discharging operations that discharge the storage batteries, and an energy management system that causes the converters to execute a charging operation when the generated power exceeds the load power and to execute a discharging operation when the generated power is below the load power. During a charging operation, the energy management system applies a first voltage-current characteristic that linearly increases the charging current in keeping with an increase in the bus voltage to each bidirectional DC/DC converter with a slope in keeping with the SOC of a storage battery.

Direct current power supplying system

An energy management system (controller) operates on a charging voltage Vba of a specified storage battery out of storage batteries to control power converting operations by bidirectional DC/DC converters. The energy management system controls the power converting operations of the respective bidirectional DC/DC converters so that the SOC of the specified storage battery is always higher than the SOCs of the other storage batteries, executes supplying of power from the other storage batteries to the DC bus with priority over supplying of power from the specified storage battery to the DC bus, and causes the corresponding bidirectional converters to stop the supplying of power from the other storage batteries the DC bus when the SOCs of the storage batteries have fallen below a lower limit value set in advance due to the supplying of power to the DC bus.

Growing community of inventors

Kanagawa, Japan

Shingo Suzuki