Kabushiki Kaisha Toshiba

Toshiyuki Umeda

Shoji Otaka

Takafumi Sakamoto

Tetsuro Itakura

Shoji Ootaka

Koji Ogura

Tsuyoshi Kogawa

Keisuke Mera

Yusuke Doi

Kiyoshi Toshimitsu

Hiroshi Yoshida

Takeshi Ueno

Yoshinao Tatebayashi

Daisuke Kurose

Nobuo Shibuya

Yu Kaneko

Toshiyuki Nakanishi

Shigeyasu Iwata

Fumi Moritsuka

Hiroki Sakurai

Makoto Tsuruta

Masahiro Ishiyama

Hideo Kasami

Hiroaki Ishihara

Eiji Kamagata

Manabu Mukai

Takashi Minemura

Satoshi Ozaki

Toshifumi Yamamoto

Akiko Yamada

Nobuhiko Sugasawa

Kunio Yoshihara

Shirou Wakayama

Masahiro Yoshikane

An electrical storage device according to an embodiment includes a power generator; a first-type capacitor that stores the electrical power generated by the power generator; second-type capacitors that are connected to the first-type capacitor in parallel; switches each of which is connected to one of the second-type capacitors; and a control circuit that controls the switches. Every time either a charging voltage or an observation voltage proportional to the charging voltage exceeds a first threshold value, the control circuit controls the switches in such a way that the i+1-th second-type capacitor (where i is an integer equal to or greater than zero) is additionally connected to the first-type capacitor in parallel.

Electrical storage device and wireless system

According to one embodiment, a power reception device includes: a power receiver that wirelessly receives power from a power transmission device; a power storage that stores the power received by the power receiver; and a signal transmitter configured to transmit a detection signal, the signal transmitter being independent of a power system operating with power fed from the power storage.

Power reception device, power transmission device, and wireless power transmission system

A power-saving control apparatus includes a memory storing first to Nth different authentication codes, determines, every time a signal including an authentication code is received, whether the authentication code in the received signal is a valid code which matches one of the authentication codes in the memory, outputs an operation signal to a main apparatus when the authentication code in the received signal is determined to be the valid code, and generates a new authentication code, when (a) the number of times the authentication code in each received signal matches a first authentication code of the authentication codes in the memory is equal to a predetermined value or (b) the authentication code in the received signal matches a second or subsequent authentication code of the authentication codes in the memory, to delete one of the authentication codes in the memory, and to store the new authentication code in the memory.

Power saving control apparatus and method

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

According to an embodiment, there is provided with an oscillator including: a clock circuit, a power supply current source and an oscillating circuit wherein the clock circuit generates a clock signal, the power supply current source generates a power supply current according to the clock signal, and the oscillating circuit generates an oscillation signal of a higher frequency than a frequency of the clock signal based on the power supply current and a received signal from an input terminal, the received signal having amplitude of a predetermined level or more.

Oscillator and radio communication device

A rectification circuit includes a first field-effect transistor and a bias voltage generation circuit. The field-effect transistor includes a first gate terminal, a first source terminal, a first source region having a first p-type diffusion layer and connected to the first source terminal, a first drain terminal, and a first drain region having a first n-type diffusion layer and connected to the first drain terminal. The bias voltage generation circuit is configured to apply a DC voltage between the first gate terminal and the first drain terminal.

Rectification circuit and wireless communication apparatus using the same

A receiving device includes a rectifier configured to rectify a received signal and a bias supply unit configured to intermittently supply the rectifier with a bias voltage corresponding to a threshold voltage of the rectifier. The receiving device further includes a detector configured to detect the received signal based on an output of the rectifier and a controller configured to control the bias supply unit to stop supplying the bias voltage upon detection of the received signal by the detector.

Receiving device and remote control system

According to an embodiment, a semiconductor integrated circuit includes a regulator, a level shifter and a switch circuit. The regulator converts an input voltage that is a difference in potential between a first terminal and a third terminal into an output voltage that is a difference in potential between a second terminal and the third terminal. The level shifter adjusts a voltage level between a first terminal and a second terminal. The switch circuit includes a first switch selectively connecting the third terminal of the regulator to a first potential, a second switch selectively connecting the third terminal of the regulator to the first terminal of the level shifter, and a third switch selectively connecting the third terminal of the regulator to a second potential.

Semiconductor integrated circuit and information processing apparatus

A wireless communication device includes: a packet detection part detecting presence/absence of a reception of a packet; a judgment part judging whether or not temporal change of presence/absence of the reception of the packet detected in the packet detection part corresponds to a predetermined identifier; and a power source control unit controlling power supply from a power source based on a result of a judgment in the judgment part.

Wireless communication device and wireless communication system

A control device being a control device communicating with a controlled device to control the controlled device includes: a first memory to store first authentication information for authenticating the controlled device; a second memory to store second authentication information for making the controlled device authenticate itself; a determination unit to compare third authentication information sent from the controlled device for specifying the controlled device with the first authentication information; a calculator to perform calculation processing on the first authentication information or the third authentication information using the second authentication information to generate a calculated value; a transmitter to transmit, when the determination unit determines that the first authentication information and the third authentication information are the same, the calculated value to the controlled device; and a memory controller to update the first authentication information.

Control device and controlled device

An electronic system includes: an AC-DC converter to convert an AC voltage into a DC voltage and to supply the DC voltage to a secondary battery; a first detector to detect a remaining amount of the secondary battery; a transmitter to transmit a signal corresponding to the remaining amount of the secondary battery; a receiver to receive the signal transmitted by the transmitter; and a controller to control the AC-DC converter using the signal received by the receiver.

Electronic system with AC-DC convertor controlled by received signal and AC-DC adaptor

In a remote controller, a startup time or a first time duration until the startup time is input into an input unit. A timer unit counts a clock time or a second time duration. A control unit generates a signal to turn on an electrical apparatus when the second time duration reaches the first time duration, or when the clock time equals to the startup time. A transmitting unit transmits the signal. In the electrical apparatus, a main unit operates main function. A transformer supplies electricity from an external power source to the main unit through a switch. A rectifier rectifies the signal. A signal identifying unit identifies it. A reservation memory unit keeps parameter for main function. A control unit turns on the switch and controls the main unit according to the parameter when the signal is received. A battery supplies electricity to above units.

Remote controller, electrical apparatus and wireless controlling system for controlling the electrical apparatus to turn on at a startup time

A wireless communication apparatus for performing communication using a first communication scheme which transmits a signal using amplitude shift keying and a second communication scheme which suppresses communication with others except a communication counterpart by transmitting a transmission suppression signal before communication is started. The apparatus includes: a first signal generation unit configured to generate transmission data; a modulation unit configured to generate first and second signals having different amplitudes by amplitude-shift keying the transmission data; a second signal generation unit configured to generate the transmission suppression signal having a signal length corresponding to that of the first signal; and a transmission unit configured to transmit the transmission suppression signal at the timing when the first signal is transmitted.

Wireless communication apparatus for suppressing interference while reducing transmission delay

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.

Directional coupler and transmitting/receiving apparatus

A charger includes: a rectifier to rectify a received radio wave to generate a charging current; a potential generator to generate a bias voltage setting an operating point of the rectifier; and a controller to supply the bias voltage generated by the potential generator when an output voltage of the rectifier is equal to or larger than a predetermined value.

Growing community of inventors

Inagi, Japan

Toshiyuki Umeda