Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

National Institute of Information and Communications Technology, Incorporated

Fumi Moritsuka

Hiroaki Ishihara

Shoji Otaka

Shuichi Obayashi

Tetsu Shijo

Kohei Onizuka

Hiroki Kudo

Akiko Yamada

Kenichirou Ogawa

Noriaki Oodachi

Toshiyuki Umeda

Hiroki Shoki

Tsuyoshi Kogawa

Masahiro Hosoya

Takafumi Sakamoto

Koji Ogura

Naoya Wada

Toshiyuki Ogawa

Seitetsu Boku

Kashiko Kodate

Takuya Yoda

Yuki Komai

Makio Fukumoto

A power transmitting apparatus including a power supply to generate AC power; a power transmitting inductor to transfer the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus; a mutual coupling adjusting unit to adjust a relative position between the power transmitting inductor and the power receiving inductor; and a control unit to control the mutual coupling adjusting unit based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor. The control unit controls the mutual coupling adjusting unit so that the mutual coupling coefficient falls within a predetermined range and an upper limit of the predetermined range is a value less than a maximum of the mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.

Power transmitting apparatus, power receiving apparatus, control apparatus, and wireless power transfer system

A power transmission apparatus includes a power transmission pad, a base structure, and grout. The power transmission pad for wireless power transmission has a cast resin frame, at least part of the cast resin frame being embedded in the ground. The base structure is disposed below the power transmission pad. The grout is filled around the power transmission pad, including a gap between an upper surface of the base structure and the power transmission pad.

Power transmission apparatus

According to one embodiment, an AC/DC converter includes a switching element that responds to a drive signal. The drive signal is generated from a three-level PWM signal that is generated from a two-level PWM signal generated from a voltage of an AC power supply and a reference signal. When a polarity of the voltage of the AC power supply is inverted, the AC/DC converter generates the drive signal by using a two-level PW signal obtained by inverting a duty ratio of a two-level PWM signal during a period just before an inversion of the polarity of the voltage of the AC power supply.

AC/DC converter

According to one embodiment, there is provided a power transmitting device including: a power supply, a resonator, an adjuster and a controller. The power supply supplies AC power. The resonator includes a magnetic core and a coil wound around the magnetic core, the resonator wirelessly transmitting the AC power supplied from the power supply to a different resonator arranged to be opposed to the resonator. The adjuster relatively moves the coil and the magnetic core along a longitudinal direction of the coil. The controller controls the adjuster based on a value of current flowing in the resonator to adjust relative positions of the magnetic core and the coil.

Power transmitting device, power receiving device, and wireless power transmitting system

A receiving apparatus includes a variable gain unit to change between a first gain and a smaller second gain, and to amplify a received signal to obtain an amplified signal; a comparator to compare a power of the amplified signal with a reference value; and a controller to set a gain to the first gain while in a standby state, to reset a gain to a third gain between the first and second gains if in a standby state the power of the received signal is larger than the reference value, and then to set a gain to the first gain and return to the standby state if the power is equal to or lower than the reference value, or if not, to a fourth gain between the first and third gains.

Wireless communicatoin method and apparatus for reducing reception error by performing automatic gain control (AGC) based on a comparison between the received signal and a reference value

There is provided a power transmitting apparatus including: a power supply, a power transmitting inductor, a mutual coupling adjusting unit and a control unit, in which the power supply supplies AC power, the power transmitting inductor transfers the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus, the mutual coupling adjusting unit adjusts a relative position between the power transmitting inductor and the power receiving inductor, and the control unit controls the mutual coupling adjusting unit, based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.

There provided a power receiving device connectable with a first load circuit operating according to AC power from a power transmitting device in which the power receiver receives the AC power from the power transmitting device via magnetic coupling, the impedance adjuster is capable of converting at least one of voltage and current of the AC power received at the power receiver, the controller controls increase in output voltage of the power transmitting device, the AC power is supplied to the first load circuit via the impedance adjuster when the first load circuit is connected to the power receiving device, and the controller controls the impedance adjuster such that an input impedance of the impedance adjuster is lower than an input impedance of the first load circuit during at least a part of a time period where the output voltage of the power transmitting device is increased.

Power receiving device, power transmitting device and control device

A radio apparatus capable of correcting a direct current offset with high accuracy in a short time is provided. A radio apparatus according to an embodiment includes a first amplifier amplifying a signal inputted to an input terminal with amplification gain determined by a variable resistor to generate a first amplified signal, and a second amplifier amplifying the first amplified signal to generate a second amplified signal. Further, the radio apparatus includes a first correcting unit correcting a direct current offset of the first amplifier, and a second correcting unit correcting a direct current offset of the second amplifier. The radio apparatus also includes a reference voltage source or reference current source supplying a reference voltage or reference current for referring a direct current offset to the first amplifier and the second amplifier, a gain controller controlling the amplification gain of the first amplifier; and a correction controller controlling the gain controller to set the amplification gain to maximum and controlling the first and second correcting units to perform correction of the second correcting unit based on the second amplified signal obtained by inputting the reference voltage or the reference current to an input terminal of the second amplifier, and thereafter perform correction of the first correcting unit based on the second amplified signal obtained by inputting the reference voltage or the reference current to an input terminal of the first amplifier.

Radio apparatus having first and second amplifiers and which performs direct current offset correction of the first and second amplifiers

The present invention provides an optical waveform shaping device () of high resolution comprising a branching filter () for branching the light beam from a light source into light beams of each frequency, a condensing part () for condensing a plurality of light beams branched by the branching filter (), a polarizing plate () for adjusting the polarization planes of the light beams having passed through the condensing part (), and a spatial light modulator () having a phase modulation part and an intensity modulation part where the light beams having passed through the polarizing plate () are incident.

Optical waveform shaping device

A directional coupler has first to fourth input/output terminals, a first phase shifting unit which is connected between the first input/output terminal and the second input/output terminal, phase-shifts a supplied signal by 90&#xb0; and outputs a resulting signal, a second phase shifting unit which is connected between the third input/output terminal and the fourth input/output terminal, phase-shifts a supplied signal by 90&#xb0; and outputs a resulting signal, a first amplifier having an input connected to the third input/output terminal and an output connected to the first input/output terminal, and a second amplifier having an input connected to the fourth input/output terminal and an output connected to the second input/output terminal.

Growing community of inventors

Kawasaki, Japan

Fumi Moritsuka