Hitachi, Ltd.

Subaru Corporation

Kabushiki Kaisha Toshiba

W. L. Gore & Associates, Inc.

Asahi Kasei Fibers Corporation

W.l. Gore & Associates, Co., Ltd.

Hitachi Mito Engineering Co., Ltd.

Yuichiro Nozaki

Tetsuo Kojima

Masafumi Makino

Takeshi Shinomiya

Satoshi Kobayashi

Tetsu Sugiura

Koichi Kai

Yuusuke Kouno

Tsunehito Fujita

Yasuomi Maki

Masaomi Konishide

Yasuhiko Kono

Satoko Sakata

In an electric power conversion device according to an embodiment, a chopper converts electric power from a power supply into direct-current power. An inverter converts the direct-current power into alternating-current power. Pairs of resonant capacitors are connected to a direct-current input section of the inverter. Each of the pairs is in series. Primary windings of high-frequency transformers are connected to the inverter and respective midpoints of the pairs of resonant capacitors. The high-frequency transformers convert the alternating-current power of the inverter. Rectifiers convert alternating-current power supplied from secondary windings of the high-frequency transformers into direct-current power. One or more voltage detectors detect output voltage of one or more of the rectifiers. A control device controls the chopper on the basis of output of the voltage detectors such that an output voltage of the direct-current power comes to a predetermined voltage value.

Electric power conversion device and control method of electric power conversion device

Provided is a laminated body, said laminated body being a laminated cloth the back surface of which has excellent properties against tangling and abrasion and good separability from the skin and which has a good texture and a favorable appearance and is comfortable to wear when made into clothing. The laminated cloth includes a front surface layer, a middle layer and a back surface layer, said layers being stacked one on another, wherein: the front surface layer comprises one member selected from the group consisting of a woven fabric, a knitted fabric and a non-woven fabric; the middle layer comprises a resin film or a non-woven fabric; and the back surface layer comprises a circular knitted fabric in which filament yarn of 60 dtex or less is used at least in part thereof and which is configured from knitting stitches and tack stitches, 9 to 72 said tack stitches being disposed per area of 12 wales&#xd7;12 courses.

Laminated cloth

A power supply apparatus for a vehicle includes a fuel cell, an air conditioner condenser, an electrical system radiator, a fuel cell radiator, and a compressor. The air conditioner condenser is disposed in a first circuit of a refrigerant used for air conditioning of a passenger compartment of the vehicle. The electrical system radiator is disposed in a second circuit of a refrigerant used for cooling of in-vehicle electric devices other than the fuel cell. The fuel cell radiator is disposed in a third circuit of a refrigerant used for cooling of the fuel cell. The compressor is disposed in an air passage coupled to the fuel cell and introduces air to the fuel cell through the air passage. One or both of the air conditioner condenser and the electrical system radiator are disposed upstream of the compressor in the air passage.

Power supply apparatus for vehicle

A control device for an electric vehicle equipped with a drive motor and a fuel cell includes a control output setter, a motor controller, and a fuel cell controller. The control output setter is configured to set a target value of an output of the drive motor based on a request command value. The motor controller is configured to control an output of the drive motor based on the target value using an electric power from a secondary battery as a power source. The fuel cell controller is configured to control the supply of a generated power by activating the fuel cell when the remaining capacity of the secondary battery decreases or an output of the secondary battery is insufficient. The control output setter decreases an allowable maximum value of the output of the drive motor when the remaining capacity can be decreased even after the fuel cell is activated.

Control device for electric vehicle and electric vehicle

A battery system control device includes a load, a secondary battery connected to the load via a first power converter converting a voltage by a switching operation, a fuel cell, and a control unit. The battery discharges power supplied to the load. The fuel cell is connected to the load and to the battery and the first power converter, via a second power converter converting a voltage. The fuel cell generates low voltage power. The control unit charges the battery using the generated power from the fuel cell. The control unit includes fuel cell and secondary battery controllers. The fuel cell controller steps up the power generated by the fuel cell to a voltage chargeable by the battery to be supplied to the load by the second power converter. The secondary battery controller directly connects the load and the battery by stopping the switching operation of the first power converter.

Control device for power system with battery and fuel cell

The purpose of the present invention is to provide a fabric provided with both excellent abrasion resistance and soft texture, and this fabric is a fabric having excellent abrasion resistance in which at least a portion of a warp or a weft yearn thereof comprises a polyamide fiber twisted yarn.

Abrasion-resistant fabric

A DC power supply including a resonant circuit on a secondary side of a transformer suppresses a surge voltage during power recovery of diodes constituting a rectifier circuit, correctly estimates a load current from a secondary current of the transformer, and adjusts supplied power when a load is light. The DC power supply includes a DC voltage source, a converter, a transformer, a rectifier circuit, a resonant circuit composed of a resonant switch and a resonant capacitor, a filter reactor, a filter capacitor, a snubber diode, a snubber capacitor, a load, first and second voltage sensors, a current sensor, and a controller for controlling gate pulses of semiconductor devices constituting a converter and the resonant switch and a signal for adjusting operation timings of A/D converters converting the signals of these sensors.

DC power supply including resonant circuit for reducing switching losses

Semiconductor element groups constituting a unit are mounted on a cooler heat receiving parton the same plane and are adapted to radiate heat by self-cooling or cooling by wind. First and fourth semiconductor elements Q, Qare arranged on the lower side of the cooler heat receiving part, second and third semiconductor elements Q, Qare arranged in the middle, a first diode Dand a second diode Dare arranged on the upper side, the first and second semiconductor elements Q, Q, as well as the third and fourth semiconductor elements Q, Qare each arranged in positions opposite to each other in a horizontal direction with respect to a centerline of a cooler in a vertical direction.

Electric power conversion device

In a DC power supply in which a DC power source and a transformer are connected via a power conversion circuit and a secondary winding of the transformer is connected to a load via a rectifier diode bridge and a filter circuit to supply power to the load, a resonance reactor is provided on an output side of the transformer, a resonant switch circuit including a parallel circuit of a diode and a semiconductor switch and a resonant capacitor is connected in parallel to the rectifier diode bridge and a snubber circuit including a snubber capacitor, a snubber diode and a diode for discharge is connected to a serial resonant circuit including the resonance reactor and the resonant capacitor in the resonant switch circuit to absorb a surge voltage.

Growing community of inventors

Tokyo, Japan

Yuichiro Nozaki