Detection apparatus, power receiving apparatus, non-contact power transmission system and detection method
First Claim
Patent Images
1. A detection apparatus comprising:
- a pulse generator with circuitry to generate pulses;
a resonant circuit including a Q-factor measurement coil and one or more capacitors, the resonant circuit configured to receive the pulses from the pulse generator;
a response-waveform detecting section configured to detect-a response waveform that is 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,wherein,the response waveform detected by the response-waveform detecting section is a time-domain response waveform,the Q-factor measuring section measures the Q factor of the resonant circuit from a first amplitude obtained from the time-domain response waveform at a first time and a second amplitude obtained from the time-domain response waveform at a second time, the second time lagging behind the first time by a time period determined in advance, andwhen a resonance frequency of the resonant circuit is denoted by f, the first amplitude obtained from the time-domain response waveform at the first time t1 is denoted by V1, and the second amplitude obtained from the time-domain response waveform at the second time t2 is denoted by V2, the Q-factor measuring section measures the Q factor in accordance with the following equation;
Q=π
f·
(t2−
t1)/ln(V1/V2).
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Accused Products
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.
20 Citations
14 Claims
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1. A detection apparatus comprising:
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a pulse generator with circuitry to generate pulses; a resonant circuit including a Q-factor measurement coil and one or more capacitors, the resonant circuit configured to receive the pulses from the pulse generator; a response-waveform detecting section configured to detect-a response waveform that is 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, wherein, the response waveform detected by the response-waveform detecting section is a time-domain response waveform, the Q-factor measuring section measures the Q factor of the resonant circuit from a first amplitude obtained from the time-domain response waveform at a first time and a second amplitude obtained from the time-domain response waveform at a second time, the second time lagging behind the first time by a time period determined in advance, and when a resonance frequency of the resonant circuit is denoted by f, the first amplitude obtained from the time-domain response waveform at the first time t1 is denoted by V1, and the second amplitude obtained from the time-domain response waveform at the second time t2 is denoted by V2, the Q-factor measuring section measures the Q factor in accordance with the following equation;
Q=π
f·
(t2−
t1)/ln(V1/V2). - View Dependent Claims (2, 3, 4, 5)
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6. A detection apparatus comprising:
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a pulse generator with circuitry to generate pulses; a resonant circuit including a Q-factor measurement coil and one or more capacitors, the resonant circuit configured to receive the pulses from the pulse generator; a response-waveform detecting section configured to detect-a response waveform that is 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, wherein, the response waveform detected by the response-waveform detecting section is a time-domain response waveform, and when a number of vibrations occurring within a predetermined time period of the time-domain response waveform is denoted by “
vibration-count,”
an amplitude obtained at a start of the predetermined time period is denoted by V1, and an amplitude obtained at an end of the predetermined time period is denoted by V2, the Q-factor measuring section measures the Q factor in accordance with the following equation;
Q=π
·
vibration-count/ln(V1/V2).
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7. A detection apparatus comprising:
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a pulse generator with circuitry to generate pulses; a resonant circuit including a Q-factor measurement coil and one or more capacitors, the resonant circuit configured to receive the pulses from the pulse generator; a response-waveform detecting section configured to detect-a response waveform that is output by the resonant circuit in response to the pulses; 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 a state of electromagnetic coupling between the Q-factor measurement coil and an external apparatus by comparing the Q factor measured by the Q-factor measuring section with a predetermined reference value. - View Dependent Claims (8, 9)
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10. A detection apparatus comprising:
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a pulse generator with circuitry to generate pulses; a resonant circuit including a Q-factor measurement coil and one or more capacitors, the resonant circuit configured to receive the pulses from the pulse generator; a response-waveform detecting section configured to detect-a response waveform that is 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, wherein, the response waveform detected by the response-waveform detecting section is a frequency-domain response waveform, and the Q-factor measuring section measures the Q factor from a bandwidth between two frequencies at each of which an amplitude of the frequency-domain response waveform is 1/√
2 times an amplitude at a resonance frequency of a series resonant circuit, the series resonant circuit including one or more of the capacitors and the Q-factor measurement coil.
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11. A detection apparatus comprising:
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a pulse generator with circuitry to generate pulses; a resonant circuit including a Q-factor measurement coil and one or more capacitors, the resonant circuit configured to receive the pulses from the pulse generator; a response-waveform detecting section configured to detect-a response waveform that is 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, wherein, the response waveform detected by the response-waveform detecting section is a frequency-domain response waveform, and the Q-factor measuring section measures the Q factor from a bandwidth between two frequencies at each of which an amplitude of the frequency-domain response waveform is √
2 times an amplitude at a resonance frequency of a parallel resonant circuit, the parallel resonant circuit including one or more of the capacitors and the Q-factor measurement coil.
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12. A power receiving apparatus comprising:
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a power receiving coil electromagnetically coupled to an external apparatus; a power receiving section configured to receive electric power from the external apparatus through the power receiving coil; a pulse generator with circuitry to generate pulses; a resonant circuit including a Q-factor measurement coil and one or more capacitors in a low pass filter configuration, the resonant circuit configured to receive the pulses from the pulse generator; a response-waveform detecting section configured to detect a response waveform that is 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.
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13. A non-contact power transmission system comprising:
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a power transmitting apparatus configured to transmit electric power by adoption of a non-contact transmission technique; and a power receiving apparatus configured to receive the electric power from said power transmitting apparatus, wherein, the power receiving apparatus includes a power receiving coil electromagnetically coupled to a power transmitting coil of the power transmitting apparatus, a power receiving section configured to receive electric power from the power transmitting apparatus through the power receiving coil, a resonant circuit including a Q-factor measurement coil and one or more capacitors in a low pass filter configuration, the resonant circuit configured to receive the pulses from the pulse generator, a response-waveform detecting section configured to detect a response waveform that is 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.
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14. A detection method comprising:
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generating pulses via circuitry of a pulse generator; applying pulses to a resonant circuit that includes a Q-factor measurement coil and one or more capacitors in a low pass filter configuration; driving a response-waveform detecting section to detect a response waveform that is output by the resonant circuit in response to the pulses; and driving a Q-factor measuring section to measure a Q factor of the resonant circuit from the response waveform detected by the response-waveform detecting section wherein, the response waveform detected by the response-waveform detecting section is a time-domain response waveform, the Q-factor measuring section measures the Q factor of the resonant circuit from a first amplitude obtained from the time-domain response waveform at a first time and a second amplitude obtained from the time-domain response waveform at a second time, the second time lagging behind the first time by a time period determined in advance, and when a resonance frequency of the resonant circuit is denoted by f, the first amplitude obtained from the time-domain response waveform at the first time t1 is denoted by V1, and the second amplitude obtained from the time-domain response waveform at the second time t2 is denoted by V2, the Q-factor measuring section measures the Q factor in accordance with the following equation;
Q=π
f·
(t2−
t1)/ln(V1/V2).
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Specification
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Current AssigneeSony Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsKomiyama, Shinji
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Primary Examiner(s)Tran, Thienvu
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Assistant Examiner(s)Mai, Tien
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Application NumberUS13/689,100Publication NumberTime in Patent Office1,433 DaysField of Search307/104US Class Current1/1CPC Class CodesG01R 15/18 using inductive devices, e....G01R 21/006 Measuring power factorG01V 3/10 using induction coilsH02J 50/12 of the resonant typeH02J 50/60 responsive to the presence ...H02J 50/80 involving the exchange of d...
