Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Asahi Kasei Kabushiki Kaisha

Yasufumi Kawai

Shuichi Nagai

Daisuke Ueda

Hiroyuki Sakai

Osamu Tabata

Takeshi Fukuda

Hiroyuki Handa

Yuta Moriura

Toru Okino

Yohei Morishita

Yoshitaka Nakamura

Toru Sakuragawa

Satoshi Morishita

Shinji Ujita

Hiroyuki Hagino

Hideaki Fujiwara

Eriko Hoshino

A travel sickness estimation system includes an estimation unit and an output unit. The estimation unit is configured to perform estimation processing of estimating, based on person information indicating conditions of a person who is on board a moving vehicle, whether or not the person is in circumstances that would cause travel sickness for him or her. The output unit is configured to output a result of the estimation processing performed by the estimation unit.

Travel sickness estimation system, moving vehicle, travel sickness estimation method, and travel sickness estimation program

A signal generation device, including: an insulation element having transmission and reception units, and isolatedly transmitting an input wave introduced to the transmission unit, to thereby output an output wave from the reception unit; a power unit generating a voltage according to the output wave; a terminal having an output signal corresponding to the voltage; a generation unit generating a control signal; an insulation unit isolatedly transmitting the control signal, and generating a drive signal according to the control signal; a selection unit selecting whether to output the output signal to the terminal, according to the drive signal; a detection unit generating a detection signal indicating the state of the output signal, according to a detection wave obtained from the transmission unit; and a control signal adjustment unit adjusting the control signal according to the detection signal, the output signal being adjusted according to the adjustment of the control signal.

Signal generation device

A high-frequency transmission device includes first and second resonators as ring-shaped wires each having an opening part at a part thereof, first and second input/output terminals each electrically connected to both resonators, a first ground shield formed on a plane different from planes on which both resonators are arranged, a second ground shield formed on a plane different from the planes on which both resonators and the first ground shield are arranged, and first and second ground wires each formed to surround peripheries of both resonators. The ground shields and the ground wires are respectively connected to each other. A dielectric wire is present between both ground wires, and the ground wires are not electrically connected to each other.

Electromagnetic resonant coupler and high-frequency transmission device

A signal inverting device generates an inverted signal of an input signal. The device includes a normally-on transistor, a negative-voltage generating unit that generates a negative voltage, and an output terminal. A first terminal of the normally-on transistor is connected to a current source. The output terminal is connected between the first terminal of the normally-on transistor and the current source. The normally-on transistor is turned on/off, by an input of a drive signal to a conduction control terminal of the normally-on transistor. The drive signal is a signal obtained by a synthesis of the input signal and the negative voltage. The inverted signal is output from the output terminal in accordance with the on/off operation of the normally-on transistor. The negative-voltage generating unit generates the negative voltage by rectifying a high-frequency power.

Signal inverting device, power transmission device, and negative-voltage generating circuit

A gate drive circuit includes: a modulation circuit that generates a first modulated signal and a second modulated signal; an isolator including a first electromagnetic resonance coupler that isolatedly transmits the first modulated signal, and a second electromagnetic resonance coupler that isolatedly transmits the second modulated signal; a first rectifier circuit that generates a first signal by rectifying the first modulated signal; a second rectifier circuit that generates a second signal by rectifying at least a part of the second modulated signal; a third rectifier circuit that generates charging voltage by rectifying a second radio-frequency wave; a capacitor that charges a charge in accordance with the charging voltage; and an output circuit which selects whether or not to supply the charge charged in the capacitor to a gate terminal of the semiconductor switch, in accordance with at least one of the first signal and the second signal.

Gate drive circuit

A drive device that drives a semiconductor switching device includes a capacitor, an output selection unit that selects whether or not to supply a charge of the capacitor to a conduction control terminal of the semiconductor switching device, and a charge consumption unit that supplies the charge of the capacitor to a portion other than the conduction control terminal, thereby consuming the charge of the capacitor.

Drive device

A resonance coupler according to one aspect of the present disclosure includes first resonance wiring and second resonance wiring. The first resonance wiring includes first open loop wiring, first input/output wiring extending outwardly from a first connection portion of the first open loop wiring, and first stub wiring extending inwardly from a second connection portion of the first open loop wiring. The second resonance wiring includes second open loop wiring, and second input/output wiring extending outwardly from a third connection portion of the second open loop wiring. The first stub wiring includes a first connection end connected to the second connection portion and a first open end on an opposite side. A wiring length from the first connection portion to the first open end is one-quarter of a wavelength of an nth-order harmonic of a radio-frequency signal, where n is an integer not less than 2.

Resonance coupler and transmission device

A gate drive circuit in an aspect of the present disclosure includes a modulated signal generation circuit that generates a first modulated signal, a first isolator that isolatedly transmits the first modulated signal, and a first rectifier circuit that generates a first output signal by rectifying the first modulated signal. The first modulated signal includes a first amplitude, a second amplitude larger than the first amplitude, and a third amplitude larger than the second amplitude. The first output signal includes a first output voltage value according to the first amplitude, a second output voltage value according to the second amplitude, and a third output voltage value according to the third amplitude.

A radio-frequency signal reception circuit that detects an input signal includes an input reference terminal, a first input terminal into which a first input signal is input, a second input terminal into which a second input signal is input, an output terminal and output reference terminal from which an output signal is output, a first detector circuit that detects the first input signal and outputs a first output signal, which is a positive-voltage pulse signal, to the output terminal, a second detector circuit that detects the second input signal and outputs a second output signal, which is a positive-voltage pulse signal, to the output reference terminal, and a transistor connected to the input reference terminal and output reference terminal. The input signal includes the first input signal and second input signal. The output signal includes the first output signal and second output signal.

Radio-frequency signal reception circuit and isolated signal transmission apparatus

A power amplifier according to the present invention includes: an input-side transformer which has an annular primary coil which is a first metal line and a plurality of linear secondary coils which are second metal lines, and matches input impedance and divides the input signal into a plurality of split signals; push-pull amplifiers each including a pair of transistors for amplifying one of the split signals; and an output-side transformer which has an annular secondary coil which is a third metal line and a plurality of linear primary coils which are fourth metal lines, and combines the amplified split signals and matches output impedance, two input terminals of the pair of transistors being connected to each other via each of the second metal lines and two output terminal of the pair of transistors being connected to each other via each of the fourth metal lines.

Power amplifier

A semiconductor chip such as an MMIC is provided. The semiconductor chip has: a Si semiconductor as a substrate; and a low-loss transmission line, and can be easily connected to a circuit board on which the semiconductor chip is to be mounted and can ensure a stable GND potential. The semiconductor chip is a flip-chip semiconductor chip, and includes: a Si substrate; an integrated circuit manufactured on a main surface of the substrate; a dielectric film formed above the integrated circuit; and a conductor film for grounding formed on an upper surface of the dielectric film. The integrated circuit includes a wiring layer including a signal line which transmits signals for the integrated circuit. The signal line, the dielectric film, and the conductor film constitute a microstrip line.

Growing community of inventors

Osaka, Japan

Yasufumi Kawai