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Open AccessArticle

Wireless Power Hanger Pad for Portable Wireless Audio Device Power Charger Application

1
Graduate Institute of Precision Manufacturing, National Chin-Yi University of Technology, Taichung 41170, Taiwan
2
Electrical and Instrumentation Laboratory, Politeknik Negeri Bandung, Bandung 40012, Indonesia
3
Department of Refrigeration, Air Conditioning and Energy Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan
*
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 419; https://doi.org/10.3390/en13020419
Received: 17 December 2019 / Revised: 31 December 2019 / Accepted: 7 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Intelligent Wireless Power Transfer System and Its Application)
Since the portability feature has been introduced in headphone development, this device now uses a battery as the main built-in power. However, the battery has limited power capacity and a short lifetime. Battery substitution and a conventional battery charger method is an ineffective, inflexible inconvenience for enhancing the user experience. This paper presents an innovative portable audio device battery built-in charger method based on wireless power technology. The developed charging device is composed of a headphone hanger pad for the wireless headphone and a charging pad for the portable wireless audio device battery charging. Circular flat spiral air-core coil was designed and evaluated using a numerical method to obtain optimal vertical magnetic field distribution based on the proposed evaluation criteria. A coil has inner coil diameter of 25 mm, outer coil diameter of 47.8 mm, wire diameter of 0.643 mm, the pitch of 0.03 mm and a number of turns of 17 was chosen to be implemented on the transmitter coil. A magnetic induction technique was adopted in the proposed wireless power transmission module which was implemented using commercial off-the-shelf components. For experimental and validation purposes, a developed receiver module applied to the commercial wireless headphone and portable audio speaker have a built-in battery capacity at 3.7 V 300 mAh. The experimental results show that the wireless power hanger pad prototype can transfer a 5 V induction voltage at a maximum current of 1000 mA, and the power transfer efficiency is around 70%. It works at 110 kHz of operation frequency with a maximum transmission distance of about 10 mm and takes 1 h to charge fully one 3.7 V 300 mAh polymer lithium battery. View Full-Text
Keywords: wireless power; headphone stand; magnetic field; audio device; portable wireless power; headphone stand; magnetic field; audio device; portable
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Luo, W.-J.; Kuncoro, C.B.D.; Kuan, Y.-D. Wireless Power Hanger Pad for Portable Wireless Audio Device Power Charger Application. Energies 2020, 13, 419.

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