Sharp Kabushiki Kaisha Corporation

Masakazu Ikeda

Hirohisa Warita

Naoki Fukunaga

Hiroyuki Shoji

Mitsuru Mariyama

Katsumi Inaba

Yasuhiro Maruyama

Atsushi Yamashita

Hiroshi Isoda

Masumi Nakamichi

Masashi Shiomi

Takashi Horiyama

Terukazu Otsuki

An LED drive circuit is an LED dive circuit that receives an alternating voltage to drive an LED, and includes a current remove portion that removes a current from a current supply line that supplies an LED drive current to the LED. If an input current to the LED drive circuit is an unnecessary current, the LED does not light because of current removal by the current remove portion. If the input current to the LED drive circuit turns into the LED drive current from the unnecessary current, the current remove portion decreases the amount of current removed.

LED drive circuit, LED illumination component, LED illumination device, and LED illumination system

A switching power supply circuit includes a full-wave rectification circuit that performs full-wave rectification of an AC input voltage so as to generate a primary voltage, a transformer that transforms the primary voltage into a secondary voltage utilizing electromagnetic induction between first and second isolated windings, a rectifying and smoothing circuit that generates a DC output voltage from the secondary voltage so as to supply the DC output voltage to a load, a primary current control circuit that performs on/off control of primary current based on a result of comparison between a primary current detection voltage corresponding to the primary current flowing in the first winding and a first reference voltage, and a reference voltage correction circuit for monitoring an on-duty ratio of secondary current flowing in the second winding so as to correct the first reference voltage.

Switching power supply circuit, semiconductor device, and LED lighting device

A high voltage generating circuit includes a boosting portion (e.g., a trigger coil ()) for boosting DC voltage delivered from a DC power supply () so as to deliver high voltage at a secondary side, a switching element (e.g., a MOSFET ()) for turning on and off current flowing in the primary side of the boosting portion, and a pulse signal generating portion (B) for generating a pulse signal for controlling on and off of the switching element.

High voltage generating circuit, ion generating device and electrical apparatus

A power usage management system includes, in order to efficiently distribute electric power, a power feeding gate device supplied with electric power from a power line and controlling supply of electric power based on a key code, a server system transmitting a key code corresponding to identification information for identifying the power feeding gate device, and a mobile receptacle attachable/detachable to/from the power feeding gate device, receiving identification information from the power feeding gate device, receiving the key code corresponding to the identification information from the server system, and providing the key code to the power feeding gate device.

Mobile receptacle, power feeding gate device, server device and power usage management system for efficiently delivering electric power

A smaller oscillator module enables oscillation frequency to be adjusted from the back after assembly is finished. The oscillator has oscillator circuit components mounted on the front of a circuit board having an internal dielectric layer, a back conductor layer covering a major part of the back of the circuit board, and at least a part of an inductor element of the oscillator circuit disposed internally with a part of an intervening dielectric layer from the back conductor layer. A slit or pinhole is formed in the back conductor. The oscillation frequency can then be adjusted after assembly is completed by emitting a trimming laser through this slit or pinhole to change the inductance by partially removing the dielectric layer and inductor element.

Growing community of inventors

Osaka, Japan

Masakazu Ikeda