Sony Corporation

Sony Group Corporation

Shinji Komiyama

Hiroaki Nakano

Osamu Kozakai

Kenichi Fujimaki

Shinichi Fukuda

Uichiro Omae

Yoshitaka Yoshino

Tomomichi Murakami

Takaaki Hashiguchi

Keigo Bunsen

Yuji Murayama

Methods and apparatus for detecting the presence of undesirable foreign matter in a region between a wireless power transmission apparatus and a power reception apparatus are described. First and second detection methods, based on different detection schemes, may be used to detect and distinguish the presence of foreign matter from misalignment during power transfer operation. A first detection method may be used before power is transferred to a load in a power reception apparatus, and a second detection method may be used while power is supplied to the load.

Wireless power transfer device with foreign object detection, system, and method for performing the same

Disclosed herein is a detection apparatus including: a resonant circuit provided with a Q-factor measurement coil and one or more capacitors to serve as a circuit for receiving pulses; a response-waveform detecting section configured to detect the waveform of a response output by the resonant circuit in response to the pulses; and a Q-factor measuring section configured to measure a Q factor of the resonant circuit from the response waveform detected by the response-waveform detecting section. It is possible to increase the precision of detection of a metallic foreign substance existing between a power transmitting side and a power receiving side.

Detection apparatus, power receiving apparatus, non-contact power transmission system and detection method

A detecting device includes a reading coil configured to read a magnetic flux generated by a detecting coil for detecting a magnetic field of an electromagnetic wave output from an exciting coil according to the magnetic field. The detecting device further includes a Q-value measuring section configured to measure a Q-value of the detecting coil on a basis of a temporal transition of oscillation of a voltage obtained in the reading coil according to the magnetic flux generated by the detecting coil.

Noncontact power transmission system to detect presence of a metallic foreign matter

Methods and apparatus for detecting the presence of undesirable foreign matter in a region between a wireless power transmission apparatus and a power reception apparatus are described. First and second detection methods, based on different detection schemes, may be used to detect and distinguish the presence of foreign matter from misalignment during power transfer operation method may be used while power is supplied to the load.

Power reception apparatus, medium, and method for controlling electrical power supplied to a load of power reception apparatus

A detection device includes a coil configured to be electromagnetically coupled with an outside, and a detection section connected to a circuit including the coil. The detection section is configured to measure a Q value of the circuit using an alternating-current signal at a frequency different from a frequency of an alternating-current signal of contactless power feed.

Detection device, energy receiver, energy transmitter, power transmission system, and detection method

The present technology relates to a driving circuit and a driving method, in which power loss at the time of switching an FET (Field Effect Transistor) can be reduced with a simple circuit configuration. A coil constitutes a resonance circuit together with an input capacitance at a gate of the FET. A switch (regeneration switch) turns on or off current flowing in the coil. A DC power source is a power source to replenish the resonance circuit with electric charge and is connected to the gate of the FET. A switch (replenish switch) turns on or off connection between the DC power source and the gate of the FET. The present technology is applicable to, for example, a power source that outputs AC voltage and current by switching operation.

Driving circuit and driving method

A power transmitting device includes a resonance circuit, a first signal generating unit, and a second signal generating unit. The resonance circuit is used in non-contact power transmission. The first signal generating unit is connected to one end of the resonance circuit, and generates, with the use of a switching system, a first high-frequency signal including one or more harmonic components. The second signal generating unit is connected to an other end of the resonance circuit, and generates, with the use of a switching system, a second high-frequency signal including a specific harmonic component. The first high-frequency signal is adjusted in pulse width and input to the one end of the resonance circuit, and the second high-frequency signal is adjusted in pulse width and phase difference from the first high-frequency signal and input to the other end of the resonance circuit.

Power transmitting device, non-contact power transmitting system, and signal generating method

An electric power transmission apparatus includes a resonance circuit, a first signal generation unit, and a second signal generation unit. The resonance circuit is used for contactless electric power transmission. The first signal generation unit is connected to one end of the resonance circuit, and generates a first high-frequency signal which includes one or more harmonic components using a switching method. The second signal generation unit is connected to the other end of the resonance circuit, and generates a second high-frequency signal which includes a specific harmonic component using the switching method. The first high-frequency signal is input to the one end of the resonance circuit, and the second high-frequency signal is input to the other end of the resonance circuit.

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Saitama, Japan

Shinji Komiyama