Detection apparatus, power receiving apparatus, non-contact power transmission system and detection method
First Claim
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1. A detection apparatus comprising:
- a signal source configured to input a signal to a resonant circuit, the resonant circuit including a coil and one or more capacitors;
a response-waveform detecting section to detect a response waveform that is output by the resonant circuit in response to the signal;
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; and
a determination section configured to determine whether or not a foreign object exists in close vicinity of the coil by comparing the Q factor measured by the Q-factor measuring section with a predetermined reference value.
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Abstract
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.
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Citations
8 Claims
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1. A detection apparatus comprising:
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a signal source configured to input a signal to a resonant circuit, the resonant circuit including a coil and one or more capacitors; a response-waveform detecting section to detect a response waveform that is output by the resonant circuit in response to the signal; 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; and a determination section configured to determine whether or not a foreign object exists in close vicinity of the coil by comparing the Q factor measured by the Q-factor measuring section with a predetermined reference value. - View Dependent Claims (2, 3)
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4. A power transmitting apparatus comprising:
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a signal source configured to input a signal to a resonant circuit, the resonant circuit including a coil and one or more capacitors; a response-waveform detecting section to detect a response waveform that is output by the resonant circuit in response to the signal; 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; a determination section configured to determine whether or not a foreign object exists in close vicinity of the coil by comparing the Q factor measured by the Q-factor measuring section with a predetermined reference value; and a power transmitting section configured to transmit electric power wirelessly to a power receiving apparatus. - View Dependent Claims (5, 6)
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7. A method comprising:
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receiving a signal in a resonant circuit, the resonant circuit including a coil and one or more capacitors; detecting a response-waveform output by the resonant circuit in response to the signal; measuring a Q-factor of the resonant circuit from the response-waveform; and determining whether or not a foreign object exists in close vicinity of the coil by comparing the measured Q factor with a predetermined reference value.
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8. A method comprising:
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receiving the signal in a resonant circuit, the resonant circuit including a coil and one or more capacitors; detecting a response-waveform output by the resonant circuit in response to the signal; measuring a Q-factor of the resonant circuit from the response-waveform; determining whether or not a foreign object exists in close vicinity of the by comparing the measured Q factor with a predetermined reference value, transmit electric power wirelessly to a power receiving apparatus; and wirelessly transmitting electric power.
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Specification