Sharp Kabushiki Kaisha Corporation

Ryoji Matsui

Kazuhito Nishimura

Kazuo Yamada

Toshiyuki Fujita

Ayumi Yagi

Hironori Kambara

Masayoshi Ozaki

Naoki Yoshimi

There is provided a contactless electricity-supplying device that can safely and efficiently supply power to a load. A contactless electricity-supplying device includes a plurality of electricity-supplying coils; a DC/AC converter that converts an output voltage from a DC supplying unit into an AC voltage to be applied to each electricity-supplying coils; a plurality of electricity-receiving coils selectively and detachably mounted on positions where the electricity-receiving coils are electromagnetically coupled to the electricity-supplying coils to receive AC voltages from the corresponding electricity-supplying coils in a contactless manner; a plurality of rectifying/smooth units that each convert an AC voltage output from each electricity-receiving coil into a DC voltage and smooth the DC voltage; a switching device that connects the DC voltages output from the rectifying/smoothing units to a single load; an electricity-reception detection sensor for detecting that the electricity-receiving coils receive the AC voltages from the corresponding electricity-supplying coils; and a control unit that turns on the switching device when it is detected that all of the electricity-receiving coils receive the AC voltages from the corresponding electricity-supplying coils.

Contactless electricity-supplying device

A bidirectional DC/DC converter includes a bidirectional DC/AC conversion circuit including a push-pull circuit connected between voltage terminals and a winding and having a switching element and a switching element coupled to opposing ends of the winding respectively, and an up-conversion circuit coupled to the push-pull circuit and the voltage terminals, and the up-conversion circuit includes an inductor for allowing passage of a current through the winding, the switching element in an ON state and the switching element in an ON state owing to stored magnetic energy, and a switching element forming a current path going through the voltage terminal, the inductor and the voltage terminal but not through the switching element and the switching element as it is turned on.

Bidirectional DC/DC converter and power conditioner

An electric power supply system is provided for feeding an output of a DC power source to a load at high efficiency and, without complicated controlling, for allowing for interchange of electric power among a commercial power system, a DC power source and a load. An electric power supply system includes a DC bus line for connecting a DC generator, a load and system power. The electric power supply system comprises a DC/DC converter connected between the DC generator and the DC bus line for controlling an output voltage to the DC bus line at a voltage V; an inverter connected between the system power and the DC bus line for operating a control in response to an input voltage Vfrom the DC bus line; and an AC/DC converter connected between the system power and the DC bus line for controlling an output voltage to the DC bus line at a voltage V, wherein the respective voltages are set as VVV

Electric power supply system

A power supply system capable of smoothing photovoltaic generation output, and enabling time shift is provided. A power supply system including a DC power supply string in which a storage battery is connected in parallel to a DC power supply; and a DC/AC power conversion device for connecting the DC power supply string to a power system or a load is provided. A switch is connected between the DC power supply and the storage battery, where an output power of the DC power supply or a combined output power of the DC power supply and the storage battery is switched and supplied to the DC/AC power conversion device by the switch. The photovoltaic generation output is thereby smoothed, and time shift is enabled.

Growing community of inventors

Osaka, Japan

Ryoji Matsui