Title:
POWER TRANSMISSION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2013/125090
Kind Code:
A1
Abstract:
Provided is a power transmission system, wherein the local maximum point of impedance can be detected even when the resonance frequency is relatively high and a frequency sweep is executed within a range that includes the frequency at which the impedance becomes the local maximum. The power transmission system is constituted by: a power transmission apparatus comprising at least a pair of first electrodes and a signal source; and a power reception apparatus comprising at least a pair of second electrodes disposed opposite to each of the first electrodes and capacitively coupled therewith and a load circuit. The power transmission system comprises a first resonant circuit and a second resonant circuit, and transmits power using a drive frequency that is determined by executing a frequency sweep of an AC signal. The frequency sweep is executed within a predetermined range that includes a local minimum frequency at which the impedance including the first resonant circuit and the second resonant circuit as seen from the power transmission apparatus side becomes the local minimum, and a local maximum frequency at which the impedance becomes the local maximum, and executed at least from the local minimum frequency to the local maximum frequency. The drive frequency is set to the frequency at which the impedance actually measured in the frequency sweep becomes the local maximum.
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Inventors:
TAKAHASHI HIRONOBU (JP)
Application Number:
PCT/JP2012/076582
Publication Date:
August 29, 2013
Filing Date:
October 15, 2012
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H02J17/00
Foreign References:
| JP2012039800A | 2012-02-23 | |||
| JP2009296857A | 2009-12-17 | |||
| JP2010252446A | 2010-11-04 |
Attorney, Agent or Firm:
FUKUNAGA Masaya (JP)
Masaya Fukunaga (JP)
Masaya Fukunaga (JP)
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Claims: