Title:
CONTACTLESS POWER TRANSMISSION SYSTEM AND HEARING AID
Document Type and Number:
WIPO Patent Application WO/2018/179902
Kind Code:
A1
Abstract:
A power transmission device incorporated into a charger (1) is provided with a power transmission coil (L1), and a frequency conversion circuit (12) that generates alternating-current transmission power having a predetermined transmission frequency (f0) from input power and transmits the transmission power to a hearing aid 2 via the power transmission coil (L1). A power reception device incorporated into the hearing aid (2) is provided with a power reception coil (L2), and a rectifying and smoothing circuit (22) and a power conversion circuit (23) that receive the transmission power from the charger (1) via the power reception coil (L2). The hearing aid 2 is provided with a telecoil (L3). The transmission frequency (f0) is set higher than the self-resonant frequency (ft) of the telecoil.
Inventors:
SUESADA TSUYOSHI (JP)
Application Number:
PCT/JP2018/004573
Publication Date:
October 04, 2018
Filing Date:
February 09, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H04R25/00; H01F38/14; H02J7/00; H02J50/12; H02J50/70
Domestic Patent References:
| WO2014155424A1 | 2014-10-02 |
Foreign References:
| JP2013502116A | 2013-01-17 | |||
| JP2011172076A | 2011-09-01 | |||
| JP2015138985A | 2015-07-30 | |||
| JP2016213224A | 2016-12-15 | |||
| JP2010527226A | 2010-08-05 | |||
| JP2013128385A | 2013-06-27 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
Download PDF: