Sanyo Electric Co., Ltd.

Sanyo Electronics Co., Ltd.

Ryuzo Hagihara

Takeo Ishida

Takeshi Nakashima

Kenji Uchihashi

Hitoshi Kishi

Hirosato Yagi

Osamu Tajima

Souichi Sakai

Masahiro Makino

Kazuo Ito

Takehito Ike

Takayoshi Abe

Wataru Horio

Yasuhiro Yagi

Chie Sugigaki

Haruhiko Tatsumi

A first line includes a switching element and is electrically coupled to a branch point and an external load which is electrically connectable to a battery parallel-operation circuit. A second line includes a resistive element, and is electrically coupled to the external load and the branch point. The first line and the second line are each provided in a plurality. The plural first lines are connected in parallel to one another, and the plural second lines are connected in parallel to one another. The branch points are electrically coupled respectively to plural external, connectable battery units.

Battery parallel-operation circuit and battery system

A switching circuit capable of efficiently practically using power generated in a plurality of photovoltaic power generation modules is provided. The switching circuit is employed for a power generation system capable of switching a connection state between the plurality of power generation modules, for switching a first connection state where at least a part of the plurality of power generation modules are connected in series with each other, and a second connection state where at least a part of the plurality of power generation modules are connected in parallel with each other, or, the generated power output portion is connected to a storage portion so that generated power is supplied from one of the power generation module to the storage portion.

Switching circuit, control apparatus, and power generation system

A charge/discharge control device capable of increasing the lifetime of a storage portion while suppressing effects of fluctuation in power generated by a power generator on a power grid is provided. This charge/discharge control device is so formed as to start charge/discharge control of the storage portion if an amount of change in power detected by a power detection portion detecting power passing through a prescribed portion of a line between the power generator and the power grid is at least a prescribed amount of change when the detected power changes from first power to second power while the detected power does not return to power in the vicinity of the first power from the second power within a first period from a time point when the detected power changes from the first power to the second power.

Charge/discharge control device and power generation system

A grid interconnection device includes a relay controller configured to control separation or interconnection of a relay; a receiver configured to receive, from a predetermined transmission path, power failure information containing at least local area information indicating an area in which a power failure occurs; a determination unit configured to determine an occurrence of a power failure in a power distribution system, when the power failure information includes local area information of an area to which the power distribution system belongs; and a detector configured to detect an islanding state. The detector increases detection sensitivity of the islanding state when the determination unit determines the power failure in the power distribution system. The relay controller performs separation control for the relay when the islanding state is detected by the detector.

Grid interconnection device, grid interconnection system and transfer trip system

This invention provides a method for suitably using a method for collectively receiving at a high voltage and distributing at a low voltage in collective housing. In this method for collectively receiving at a high voltage and distributing at a low voltage to a plurality of users, a distribution control part for collectively receiving power and distributing the power at a low voltage includes a serverand a control devicefor controlling information on power consumed by the users. The control deviceand the server are connected via a network. The servergrasps a maximum current capacity necessary for each user, determines a contracted current depending on the grasped maximum current capacity, and distributes power to each user.

Method for collectively receiving at high voltage and distributing at low voltage, and collective housing using same

A system for reducing power without making users feel inconvenience and discomfort in collective housing or the like. The system includes a plurality of air conditioners and a central control unit connected with the air conditioners via a communication line. The central control unit controls the plurality of air conditioners to operate in time or alternately to prevent electric current concentration.

Power load control system

A controller of a data communication apparatus according to the present invention stores information on each successful and unsuccessful data communication, a season, a data of the week, a time, and a data communication rate of the communication for each site in a data memory. The controller reads out a data communication rate at which a data communication succeeded from the data memory and directs a modem to conduct a communication at the data communication rate. A data communication is conducted at the directed data communication rate. These procedures ensure a secure link between sites and a secure data communication irrespective of a line distance between the sites etc.

Data communication apparatus

The present invention prevents an increase in an overvoltage and increases an optimum operating voltage of a power inverter. A photovoltaic power generation device is provided with a solar cell device,, a power inverter,for inverting output from the solar cell device,into AC power, a current path circuit,connected in parallel between the solar cell device,and the power inverter,, and a current detection circuit,for detecting a current feeding back to the solar cell device,. When a current detected by the current detection circuit,reaches beyond a predetermined current value, the current path circuit,is cut off.

Photovoltaic power generation device

A device for operating inverters according to the present invention can operate a plurality of inverters for converting DC output from a DC source such as a solar cell to AC output efficiently without relying on a particular inverter. The plurality of inverters are connected to the DC source through switches. DC output from a DC source is measured by a measuring device to determine the number of inverters to be operated on a basis of the output result from the measuring device. The inverters to be added or cut off are determined among the plurality of inverters at random on a basis of the random number and switches of the determined inverters are turned ON or OFF in order to select inverters to be operated.

Device for operating inverter and power system

The present invention is directed to a photo-voltaic apparatus comprising a photo-voltaic module having a plurality of photo-voltaic cells, and an inverter for converting a direct current output generated from the photo-voltaic cells into an alternating current and outputting the alternating current, the inverter being mounted on a surface opposite to the light receiving surface of the photo-voltaic module with a clearance provided therebetween, so that heat self-generated by the inverter can be efficiently radiated, and heat from the photo-voltaic module is not transferred to the inverter.

Growing community of inventors

Kobe, Japan

Ryuzo Hagihara