Abstract: A device management system (1) includes a common certification information acquirer, a certifier, an identification information generator, and a setter. The common certification information acquirer acquires common certification information from a device (10) including a storage for storing the common certification information. The common certification information stored in the storage is shared with another device. The certifier certifies the device (10) based on the common certification information. The identification information generator generates identification information for identification of the device (10) certified by the certifier. The setter sets the identification information to the device (10).

Abstract: According to one embodiment, an electronic circuitry includes a clock generation circuit configured to generate a first clock signal; a first conversion circuit configured to convert an input signal into a first signal having a frequency corresponding to the first clock signal based on the first clock signal; a first electromagnetic field coupler configured to transmit the first signal by electromagnetic field coupling; a second electromagnetic field coupler configured to transmit the first clock signal by electromagnetic field coupling; and a second conversion circuit configured to convert the first signal transmitted by the first electromagnetic field coupler into a second signal having a frequency corresponding to the input signal, based on the first clock signal transmitted by the second electromagnetic field coupler.

Abstract: A plurality of heat dissipation substrates stacked on each other, intermediate sheets disposed under a lowermost heat dissipation substrate, on an uppermost heat dissipation substrate, and between heat dissipation substrates adjacent to each other, a drying agent disposed over or under the plurality of heat dissipation substrates, and a bag that seals the plurality of heat dissipation substrates, the plurality of intermediate sheets, and the drying agent.

Abstract: an electronic circuit according to an embodiment includes: a generation circuit generating a first clocksignal and a second clocksignal delayed from the first clocksignal; a first coupler transmitting one of the first and the second clocksignals by electromagnetic coupling; a first converter driven by the transmitted clocksignal and converting a first input signal into a first signal of a frequency corresponding to the transmitted clocksignal; a second coupler transmitting the first signal by electromagnetic coupling; a second converter converting the first signal into a second signal of a frequency corresponding to the first input signal with the other of the first and the second clocksignals; an output device outputting the second signal; and a protection circuit connected to a line through which the one of the first and the second clocksignals is transmitted between the first coupler and the first converter.

Abstract: According to one embodiment, electronic circuitry includes a transmission circuit to output a waveform including a plurality of pulse waveforms in response to an input signal. The pulse waveforms include a first transmit pulse waveform, and a second transmit pulse waveform following the first transmit pulse waveform, and the first transmit pulse waveform is larger in amplitude than the second transmit pulse waveform.

Abstract: According to one embodiment, electronic circuitry includes: transmitting circuitry to output a first waveform including N pulse waveforms (N is a natural number larger than 1) in response to an input signal; transfer circuitry to transfer the first waveform as a second waveform that includes at least N+1 pulse waveforms, via electromagnetic coupling; and receiving circuitry configured to receive the second waveform and determine the input signal based on the at least N+1 pulse waveforms.

Abstract: In one embodiment, electronic circuitry comprises a first circuit capable of transmitting and receiving signals, a second circuit capable of transmitting and receiving signals, and an insulation element. The first circuit has a first terminal to which a first clock signal is input, increases the frequency of the first clock signal to generate a second clock signal, and transmits the second clock signal. The insulation element transmits the second clock signal obtained from the first circuit to the second circuit as a third clock signal. The second circuit receives the third clock signal from the insulation element, and transmits a first data signal in response to the third clock signal. The insulation element transmits the first data signal obtained from the second circuit as a second data signal. The first circuit receives the second data signal from the insulation element.

Abstract: According to one embodiment, there is provided a magnetic coupling device including a first coil, a second coil, a third coil, a fourth coil, a first constant-potential node and a second constant-potential node. The second coil is electrically connected with one end of the first coil and wound in a direction opposite to a direction in which the first coil is wound. The third coil faces the first coil. The fourth coil faces the second coil. The first constant-potential node is electrically connected with one end of the third coil. The second constant-potential node is electrically connected with one end of the fourth coil.

Abstract: An electronic circuit according to the embodiment of the present invention includes a first circuit, a second circuit electrically insulated from the first circuit, and a transmitter transmitting a signal between the first and the second circuits. The first circuit receives an input signal, generates a first reference signal, and converts frequencies of the input signal and the first reference signal. The transmitter transmits the frequency-converted input signal and first reference signal to the second circuit. The second circuit converts the frequencies of the transmitted input signal first reference signal to obtain a restored input signal and a restored first reference signal, generates a second reference signal, calculates a gain to be adjusted of the restored input signal based on the restored first reference signal and the second reference signal to adjust the gain of the restored input signal.

Abstract: An electronic circuit according to the embodiment of the present invention includes a first circuit, a second circuit electrically insulated from the first circuit, and a transmitter transmitting a signal between the first and the second circuits. The first circuit receives an input signal, generates a first reference signal, and converts frequencies of the input signal and the first reference signal. The transmitter transmits the frequency-converted input signal and first reference signal to the second circuit. The second circuit converts the frequencies of the transmitted input signal first reference signal to obtain a restored input signal and a restored first reference signal, generates a second reference signal, calculates a gain to be adjusted of the restored input signal based on the restored first reference signal and the second reference signal to adjust the gain of the restored input signal.

Abstract: According to one embodiment, there is provided a magnetic coupling device including a first coil, a second coil, a third coil, a fourth coil, a first constant-potential node and a second constant-potential node. The second coil is electrically connected with one end of the first coil and wound in a direction opposite to a direction in which the first coil is wound. The third coil faces the first coil. The fourth coil faces the second coil. The first constant-potential node is electrically connected with one end of the third coil. The second constant-potential node is electrically connected with one end of the fourth coil.

Abstract: an electronic circuit according to an embodiment includes: a generation circuit generating a first clocksignal and a second clocksignal delayed from the first clocksignal; a first coupler transmitting one of the first and the second clocksignals by electromagnetic coupling; a first converter driven by the transmitted clocksignal and converting a first input signal into a first signal of a frequency corresponding to the transmitted clocksignal; a second coupler transmitting the first signal by electromagnetic coupling; a second converter converting the first signal into a second signal of a frequency corresponding to the first input signal with the other of the first and the second clocksignals; an output device outputting the second signal; and a protection circuit connected to a line through which the one of the first and the second clocksignals is transmitted between the first coupler and the first converter.

Abstract: An electronic circuit according to an embodiment includes a clock generator, a delay element, a first electromagnetic coupler, a first frequency converter, a second electromagnetic coupler, a second frequency converter, a controller and an output device. The clock generator is configured to generate a first clock signal. The delay element is configured to output a second clock signal which has a phase delayed with respect to the first clock signal. The first electromagnetic coupler is configured to transmit one of the first and second clock signals by electromagnetic coupling. The first frequency converter is driven by the one of the first and second clock signals transmitted from the first electromagnetic coupler and is configured to convert a first input signal to a first signal with a first frequency corresponding to the one of the first and second clock signals.

Abstract: 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.

Abstract: An electronic circuit according to an embodiment includes a clock generator, a delay element, a first electromagnetic coupler, a first frequency converter, a second electromagnetic coupler, a second frequency converter, a controller and an output device. The clock generator is configured to generate a first clock signal. The delay element is configured to output a second clock signal which has a phase delayed with respect to the first clock signal. The first electromagnetic coupler is configured to transmit one of the first and second clock signals by electromagnetic coupling. The first frequency converter is driven by the one of the first and second clock signals transmitted from the first electromagnetic coupler and is configured to convert a first input signal to a first signal with a first frequency corresponding to the one of the first and second clock signals.

Abstract: According to one embodiment, there is provided a magnetic coupling device including a first coil, a second coil, a third coil, a fourth coil, a first constant-potential node and a second constant-potential node. The second coil is electrically connected with one end of the first coil and wound in a direction opposite to a direction in which the first coil is wound. The third coil faces the first coil. The fourth coil faces the second coil. The first constant-potential node is electrically connected with one end of the third coil. The second constant-potential node is electrically connected with one end of the fourth coil.

Abstract: According to one embodiment, there is provided a magnetic coupling device including a first coil, a second coil, a third coil, a fourth coil, a first constant-potential node and a second constant-potential node. The second coil is electrically connected with one end of the first coil and wound in a direction opposite to a direction in which the first coil is wound. The third coil faces the first coil. The fourth coil faces the second coil. The first constant-potential node is electrically connected with one end of the third coil. The second constant-potential node is electrically connected with one end of the fourth coil.

Abstract: According to one embodiment, a wireless power transmission system includes: an AC power source; a power transmission resonator; a power reception resonator; an AC/DC converter; a first circuit disposed between the AC power source and the power transmission resonator; and a second circuit disposed between the power reception resonator and the AC/DC converter. Parameter values of passive elements in the first and second circuits are set so that an absolute value of an inverse transfer function between an input voltage and an output voltage of a target system at a frequency of the AC voltage is equal to or less than a divided value of the AC voltage by a battery voltage while the AC voltage is increased from a first voltage value to a second voltage value, the target system comprising the first circuit, the power transmission resonator, the power reception resonator, the second circuit and the AC/DC converter.

Abstract: A modulator includes an oscillator to start an oscillation operation when an input data changes from a first logic to a second logic, and stops the oscillation operation when the input data changes from the second logic to the first logic, a pulse generator to output a predetermined number of pulses of a pulse signal having a predetermined pulse width when the input data changes from the second logic to the first logic, and a signal selector to select an oscillation signal outputted from the oscillator when the input data has the second logic, and selects the pulse signal outputted from the pulse generator when the input data has the first logic.

Abstract: A modulator includes an oscillator to start an oscillation operation when an input data changes from a first logic to a second logic, and stops the oscillation operation when the input data changes from the second logic to the first logic, a pulse generator to output a predetermined number of pulses of a pulse signal having a predetermined pulse width when the input data changes from the second logic to the first logic, and a signal selector to select an oscillation signal outputted from the oscillator when the input data has the second logic, and selects the pulse signal outputted from the pulse generator when the input data has the first logic.