Hitachi Automotive Systems, Ltd.

Nippon Kayaku Kabushiki Kaisha

Hitachi Industrial Equipment Systems Co., Ltd.

Dowa Mining Co., Ltd.

Zaidan Hojin Biseibutsu Kagaku Kenkyu Kai

Zaidan Hojin Biseibutsu Kagaku

Fumihiro Sato

Takae Shimada

Eigo Kishimoto

Hamao Umezawa

Kenji Kubo

Hiroyuki Shoji

Teruya Nakamura

Shintaro Suzuki

Hiroshi Ninomiya

Kiyoshi Araki

Taka'aki Ohkuma

Keisuke Tanabe

Toshiya Kitamura

Takayuki Oouchi

Makiko Yanagisawa

Daisuke Matsumoto

Ryo Sakamoto

Shintaro Tanaka

Masahiro Hiraga

Takashi Terada

Takuya Ishigaki

Naoki Takata

Yuichi Fujii

Naoya Takahashi

Minoru Nakada

Koji Hamano

Takayuki Ouchi

Koichi Yoshida

Yasuo Ishii

Masayuki Iwasaki

Shigetoshi Yagihara

Kiyotaka Tomiyama

Hiroyoshi Miyazaki

Yasuhiko Niitsu

Noriya Ishida

Takashi Onoue

Masamitsu Kaga

With the aim of improving the reliability of a power conversion device for driving a motor, this power conversion device is provided with a rectifying portion for rectifying an AC voltage and outputting a DC voltage, a smoothing capacitor for smoothing the DC voltage, an inverter portion into which the DC voltage is input and which outputs AC power, an inverter drive portion for outputting a gate signal to the inverter portion, a regenerative braking portion connected in parallel with the smoothing capacitor, a regenerative braking drive portion for outputting a gate signal to the regenerative braking portion, a control portion for outputting drive signals to the inverter drive portion and the regenerative braking drive portion, a regenerative braking overcurrent detecting portion for outputting an overcurrent detection signal if the current flowing through the regenerative braking portion exceeds a determination value, and a latch portion into which the overcurrent detection signal output from the regenerative braking overcurrent detecting portion is input and which outputs a gate output interruption signal to the control portion, wherein switching elements of the inverter portion and the regenerative braking portion stop in an off state when the regenerative braking overcurrent detection portion detects an overcurrent.

Power conversion device

Provided is a power conversion device which comprises a main circuit board, a first board, and a second board and which has a reduced size. The main circuit board has a rectifier circuit and an inverter circuit which are disposed in a high-power section, the rectifier circuit rectifying AC voltage and The second board is provided with a The first board is connected to the main circuit board and to the second board, and is provided with: a first circuit disposed in a low-power section. The second board is provided with a second circuit disposed in a low-power section. section from each other in a reinforced manner; an insulating transformer disposed in the reinforced insulation region and constituting a constituent component of a power supply circuit for receiving the DC voltage and supplying power to the first circuit and to the second circuit; and an insulating element disposed in the reinforced insulation region and allowing a signal to be exchanged between the first circuit and the second circuit.

An object of the present invention is to provide a highly efficient power supply device. A power supply deviceaccording to the present invention includes a bidirectional DC-DC converterand an insulated DC-DC converter. The bidirectional DC-DC converterreceives a main batteryand outputs a direct-current link voltage Vlink. The insulated DC-DC converterreceives the link voltage Vlink and supplies power to a load. The link voltage Vlink, which is an output of the bidirectional DC-DC converter, changes according to the output voltage of the insulated DC-DC converter

Power supply device

An object of the present invention is to provide a charging apparatus having high efficiency of charging a battery by inputting an alternating current voltage. A charging apparatus that charges a direct current battery includes a step-down converter unit to which a direct current voltage from a power supply is input and that converts the direct current voltage, and when a voltage of the direct current battery is between a predetermined first voltage smaller than a charge completion voltage of the direct current battery and the charge completion voltage, a variable voltage that increases from the first voltage to the charge completion voltage in accordance with charging of the direct current battery is input to the step-down converter unit.

Power supply apparatus

Provided is a power source device having a high efficiency. A power source deviceincludes an insulated AC-DC converterwhich receives a voltage of an AC power sourceand outputs a link voltage Vlink, a bidirectional DC-DC converterwhich receives the link voltage Vlink to charge a main battery, an insulated DC-DC converterwhich receives the link voltage Vlink to supply power to a load, an operation mode in which the power is supplied from the AC power sourceto the main battery, and an operation mode in which the power is supplied from the main batteryto the load

Power source device

Zinc powder comprising particles having part or all of their surfaces coated either with copper and/or indium or with silver is used as a battery material or an active material for the negative electrode in a battery. The powder can be used as an anode active material in a secondary battery to achieve a higher discharge capacity and better cycle characteristics.

Zinc powders for use in batteries and a secondary alkaline zinc battery

A novel primary or secondary battery whose active material for the negative electrode is composed of metallic gallium, gallium alloys or gallium oxide has first come into the world. Gallium has an electrochemical equivalent of 23.24, which is smaller than those of zinc (32.70) and cadmium (56.21). This indicates that when used as an active material for the negative electrode in batteries, gallium has larger capacity per unit mass than zinc and cadmium by respective factors of ca. 1.4 and 2.4. The potential of the reaction; Ga+6OH.sup.- =GaO.sub.3.sup.3- +3H.sub.2 O+3e.sup.- is obviously less noble than the voltage of hydrogen evolution and this means that a high-potential battery can be made. Due to the high hydrogen overvoltage of gallium, gallium ions in the solution can be precipitated as metallic gallium by electrodeposition. As a further advantage, no dendrite formation occurs during the electrodeposition unlike in the case of zinc. The high hydrogen overvoltage also contributes to the production of a battery that undergoes only limited self-discharge. What is more, gallium which has no toxicity presents few environmental problems.

Gallium based active material for the negative electrode, a negative

The present invention relates to a stable medical composition for injection containing (1) a Spergualin of the formula: ##STR1## [wherein R is ##STR2## (wherein R' is a lower alkyl group having 1 to 4 carbon atoms), ##STR3## or a salt thereof and (2) at least one stabilizer selected from the group consisting of mannitol, maltose, dextran, lactose, cyclodextrin, gelatin, chondroitin sulfate, and human serum albumin; when R is ##STR4## mannitol is excepted. A spergualin is useful as cancer control agents and immunomodulators.

Medical composition for injection containing a spergualin as active

The present invention relates to a stable medical composition for injection containing (1) a Spergualin of the formula: ##STR1## [wherein R is ##STR2## --(CH.sub.2).sub.6 --, --(CH.sub.2).sub.4 --CH.dbd.CH--, ##STR3## (wherein R' is a lower alkyl group having 1 to 4 carbon atoms), --(CH.sub.2).sub.8 --, or ##STR4## or a salt thereof and (2) at least one stabilizer selected from the group consisting of mannitol, maltose, dextran, lactose, cyclodextrin, gelatin, chondroitin sulfate, and human serum albumin; when R is ##STR5## mannitol is expected. A spergualin is useful as cancer control agents and immunomodulators.

The present invention relates to a process for producing polyacrylic acid salt granules easily soluble in water characterized in that a water-soluble powder of polyacrylic acid salt is granulated according to fluidized bed granulation method while an aqueous solution of the polyacrylic acid salt of a viscosity of 50-700 c.p.s. is sprayed thereon.

Process for producing polyacrylic acid salt granules easily soluble in

Granules of polyacrylic alkali metal salts are coated with a water-insoluble but water-permeable coating agent.

Coated granules of polyacrylic alkali metal salts and method of

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Tokyo, Japan

Fumihiro Sato