Jfe Steel Corporation

Toyota Jidosha Kabushiki Kaisha

Nkk Corporation

Kansai Paint Company, Ltd.

Denso Corporation

Tatsuya Miyoshi

Seiji Nakajima

Hiroki Nakamaru

Masaaki Yamashita

Naoto Yoshimi

Shinji Ootsuka

Takuya Kadoguchi

Satoru Ando

Tomomi Okumura

Hiroyuki Masuoka

Haruki Matsuoka

Takanori Kawashima

Akira Matsuzaki

Toyofumi Watanabe

Takahiro Kubota

Masaru Sagiyama

Yoshikazu Suzuki

Koichi Go

Takashi Nakano

Kenichi Sasaki

Kazuhisa Okai

Masaya Kaji

Kiyofumi Nakajima

Masahiro Murata

Kazumi Yamada

Toshiyuki Ookuma

Takao Ooshima

Syoichi Tanaka

Tsutomu Watanabe

Takahiro Hirano

Katsuya Hoshino

Daisuke Sato

Yoshiharu Sugimoto

Takayoshi Yano

Kenichi Okumura

Seigen Maeno

Yasuhiko Haruta

Akihiko Furuta

Norio Kosaka

Takafumi Yamaji

Hiroyasu Matsuki

Toshiyuki Okuma

Kazuya Urata

Masahiro Oguchi

Kenichi Tomita

Sayuri Takahashi

A solar power generation control device controls a solar power generation system storing electric power generated by a solar panel in a battery. The solar power generation control device includes a detection unit configured to detect a state of the battery, and a controller configured to control, based on the state of the battery, a sleep time for temporarily stopping the solar power generation system when a predetermined sleep condition is satisfied.

Solar power generation control device and control method

A charge control system including a solar panel configured to generate electric power with sunlight, a chargeable and dischargeable first battery, a chargeable and dischargeable second battery, and a charge control unit connected to the solar panel, the first battery and the second battery, and a method of the charge control system are provided. The charge control unit is configured to switch between a first mode (indirect charge mode) in which a process of charging the first battery with electric power generated by the solar panel and a process of charging the second battery with electric power stored in the first battery are repeatedly executed depending on a state of charge of the first battery and a second mode (direct charge mode) in which electric power generated by the solar panel is directly charged into the second battery based on at least electric power generated by the solar panel.

Charge control system and charge control method

A short-circuit fault detection device detects a short-circuit fault in a step-up and step-down DC-DC converter that takes generated power of a solar cell as an input and outputs a predetermined voltage to a power storage. The DC-DC converter includes a step-up upper arm, a step-up lower arm, a step-down upper arm, and a step-down lower arm. The short-circuit fault detection device includes a voltage detection unit detecting a voltage output to the DC-DC converter from the solar cell, a current detection unit detecting a current output to the power storage from the DC-DC converter, and a controller controlling switching elements constituting the DC-DC converter to determine whether each arm of the DC-DC converter has a short-circuit fault based on a detected voltage value that is a detected value of the voltage detection unit, and a detected current value that is a detected value of the current detection unit.

Short-circuit fault detection device

A solar power generation system includes a solar module, a power converter, and a control device. The power converter is configured to control an output voltage of the solar module such that the output voltage matches a target output voltage. The control device is configured to determine a lower limit value of the target output voltage based on the following general formula.  In the general formula, Idenotes a used light intensity, and T denotes a temperature. V(I, T) denotes the lower limit value of the target output voltage. V(I, T) denotes an open-circuit voltage of the solar module. The number of the solar cells connected in series is denoted by n. V(T) denotes a positive value of a reverse breakdown voltage of one solar cell. A tolerable error is denoted by &#x3b1;.

Solar power generation system

A method is provided for producing a hot-pressed member including heating a Ni-based coated steel sheet, which includes, on a surface thereof, a Zn&#x2014;Ni alloy coating layer containing 13% by mass or more of Ni, in a temperature region of an Ac3 transformation point to 1200&#xb0; C.; and then hot-pressing the steel sheet.

Method for producing hot-pressed member

In a case where it is determined that a generated electric power of a solar panel is less than a predetermined value, a control unit of a solar photovoltaic generation device is configured to disconnect a solar battery from a first electric power conversion unit and a second electric power conversion unit, stop providing a power supply to the first electric power conversion unit to execute a power saving control, and store an open circuit voltage of the solar panel as a reference voltage after the execution of the power saving control. In a case where the open circuit voltage of the solar panel exceeds the reference voltage continuously for a predetermined time period after the execution of the power saving control, the control unit is configured to connect the solar battery to the first electric power conversion unit and the second electric power conversion unit, and start providing the power supply to the first electric power conversion unit to release the power saving control.

Solar photovoltaic generation device

The invention provides a steel sheet for hot press-forming that can reliably give hot press-formed parts having excellent paint adhesiveness, perforation corrosion resistance and joint corrosion resistance, and also provides a method for manufacturing the steel sheet for hot press-forming, and a method for producing hot press-formed parts using the steel sheet for hot press-forming. The steel sheet for hot press-forming includes a base steel sheet and a Zn-based coating layer with a mass of coating of 10 to 90 g/mon the base steel sheet, wherein the average ferrite grain diameter in the surface microstructure of the base steel sheet is not more than 20 &#x3bc;m.

Steel sheet for hot press-forming, method for manufacturing the same, and method for producing hot press-formed parts using the same

A steel sheet for hot pressing that is capable of suppressing formation of scales or ZnO in hot pressing and excellent in oxidation resistance, and a method for manufacturing a hot-pressed member using the steel sheet are provided. The steel sheet for hot pressing includes a base steel sheet and a plating layer that is formed on a surface of the base steel sheet at a coating weight of 10 to 90 g/mand contains 10 to 25% by mass of Ni and the balance Zn with inevitable impurities.

Steel sheet for hot pressing and method for manufacturing hot-pressed member using the same

A hot-pressing steel sheet has excellent oxidation resistance to be capable of suppressing the formation of scales and ZnO during hot pressing as well as is excellent in cold pressing properties. A process of manufacturing a hot pressed member uses the steel sheet. The hot-pressing steel sheet includes a coating layer containing 10 to 25 mass % of Ni and a balance of Zn and inevitable impurities and having a mass per unit area of 10 to 90 g/m, and a lubricating layer containing a solid lubricant, in the order named on the surface of a steel sheet.

Steel sheet for hot pressing and process for manufacturing hot pressed member using the steel sheet

A solar power generation device is provided which includes a first DC-DC converter to which an output of a solar battery is input, a storage battery to which an output of the first DC-DC converter is input, a second DC-DC converter that converts a voltage of the storage battery, and a control unit. The control unit changes a duty ratio of the first DC-DC converter so as not to charge the storage battery and changes a duty ratio of the second DC-DC converter so as to set an operating point of the solar battery to a maximum power point, when a value indicating a state of charge of the storage battery is equal to or greater than a predetermined value.

Solar power generation device and control method of solar power generation device

A steel sheet for hot press-forming includes a zinc coating layer and a Si-containing compound layer in this order on a base steel sheet, wherein the Si-containing compound layer contains a silicone resin having an organic functional group of a carbon number of 4 or more.

Steel sheet for hot press-forming, hot press-formed part, and method of producing hot press-formed part

A hot-pressed member includes a steel sheet, a Ni-diffusion region present in a surface layer of the steel sheet, and an intermetallic compound layer and a ZnO layer which are provided in order on the Ni-diffusion region, the intermetallic compound layer corresponding to a &#x3b3; phase present in a phase equilibrium diagram of a Zn&#x2014;Ni alloy, wherein a spontaneous immersion potential indicated in a 0.5 M NaCl aqueous air-saturated solution at 25&#xb0; C.&#xb1;5&#xb0; C. is &#x2212;600 to &#x2212;360 mV based on a standard hydrogen electrode.

Hot-pressed member

A control device which performs at least MPPT control of output of a solar cell mounted in a vehicle includes a determination unit that determines whether the vehicle is in a travelling state or a stationary state. Different methods are applied when the vehicle is determined to be in the travelling state and in the stationary state respectively.

Control device for in-vehicle solar cell

A method for producing a hot-pressed member includes heating a coated steel sheet, which includes, on a surface thereof, a Zn&#x2014;Ni alloy coating layer containing 10% by mass or more and less than 13% by mass of Ni at a coating weight of over 50 g/mper side of the steel sheet, in a temperature region of an Actransformation point to 1200&#xb0; C. at an average heating rate of 12&#xb0; C./second or more, and then hot-pressing the steel sheet.

Growing community of inventors

Fukuyama, Japan

Tatsuya Miyoshi