Fujikura Limited

Sharp Kabushiki Kaisha Corporation

Kazuhiro Yamamoto

Kenichi Okada

Ryoji Yanagimoto

Yuji Yamada

Kenjiro Yano

Hiroshi Matsui

Yoshiki Shibata

Yoshiyasu Isobe

Kunio Sensui

A power storage system includes: a power generation element that performs environmental power generation; a storage battery that is supplied with power generated by the power generation element; a DC/DC converter that converts an output voltage from the power generation element into a predetermined voltage; a first switch unit that switches whether directly supply the output voltage from the power generation element to the storage battery or to supply thereto via the DC/DC converter; and a first changeover unit that compares a voltage of the storage battery with a first threshold voltage, and controls the first switch unit according to a comparison result, in a case where a voltage of the voltage or higher of the storage battery bringing the DC/DC converter into a main boost mode is the first threshold voltage.

Power storage system and power storage method

A power storage system includes: a first storage battery that is configured to be supplied with power generated by a power generation element performing environmental power generation and to supply power to an external load apparatus; a second storage battery that is configured to have a capacity larger than a capacity of the first storage battery, and to supply power to the external load apparatus; a first switch unit that performs switching between an electrical connection state and disconnection state between the first storage battery and the second storage battery; and a first changeover unit that compares a voltage of the first storage battery with a first threshold voltage which is equal to or higher than a voltage causing the external load apparatus to be operated, and controls the first switch unit according to a comparison result.

A power storage system of the invention, includes: a power generator; a first storage battery; a second storage battery having smaller capacitance than that of the first storage battery; a first switcher that connects or disconnects the first storage battery to or from a power supply line and a load device; a second switcher that connects or disconnects the second storage battery to or from the power supply line and the load device; a first switching unit that compares a voltage supplied to the load device with first and second predetermined threshold voltages and controls the first switcher according to a result of the comparison; and a second switching unit that compares the voltage supplied to the load device with third and fourth predetermined threshold voltages and controls the second switcher according to a result of the comparison.

A power storage system includes a power generation element that performs environmental power generation, a first storage battery that receives power generated by the power generation element and supplies the power to a load device, a second storage battery that has a capacitance smaller than that of the first storage battery and is connected in series with the first storage battery, a first switcher that is connected in parallel to the second storage battery, short-circuits both terminals of the second storage battery in a closed state, and releases a short-circuited state of the second storage battery in an open state, and a switching unit that controls the opened and closed states of the first switcher.

A method for producing a dye-sensitized solar cell includes: preparing a first electrode comprising a transparent substrate and a transparent conductive film, and a second electrode comprising a metal substrate that is formed of a metal capable of forming a passivation film; forming an oxide semiconductor layer on the first electrode; supporting a photosensitized dye on the oxide semiconductor layer; disposing an electrolyte on the oxide semiconductor layer; facing the first electrode and the second electrode, and sealing the electrolyte by a sealing section; and fixing a connection member formed of a metal having lower resistance than the metal substrate, onto the surface of the metal substrate, with the surface being on the opposite side of the first electrode, in which method in fixing the connection member, the connection member is bonded to the metal substrate by resistance welding, and thereby the connection member is fixed onto the metal substrate.

Dye-sensitized solar cell and process of manufacturing same, dye-sensitized solar cell module and process of manufacturing same

An illegal data use prevention system includes a registrar which issues first authentication information for a game machine reproducing data and second authentication information for a user-identifying IC card. The data is identified by the first authentication information and the second authentication information. The game machine contains the first authentication information and, for example, executes a game program in accordance with a result of determination as to whether the IC card contains the second authentication information. Thus, illegal use of data is effectively prevented.

Growing community of inventors

Sakura, Japan

Kazuhiro Yamamoto