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Paper Abstract and Keywords
Presentation 2014-11-18 10:00
A Novel ZVS Class-D Direct-Current-Resonance Wireless Power Transfer with GaN FETs Operated in 6.78MHz
Tatsuya Hosotani (Murata Manufacturing) WPT2014-50
Abstract (in Japanese) (See Japanese page) 
(in English) A novel ZVS class-D direct-current-resonance wireless power transfer with GaN FETs operated in 6.78MHz is proposed. A direct-current resonance system is an energy conversion system, which makes the electromagnetic resonance field from a direct current and uses a resonance field with an electromagnetic interaction. A new technique called the periodic state dividing method is proposed in order to analyze energy conversion operation. We clarify the system characteristics by use of the proposed unified analysis method for the resonance coupling. In order to reduce the power loss in the 3rd quadrant operation peculiar to GaN FET, the optimum ZVS operation technology with dead time adjustment technique is newly developed. In the experiment, the unprecedented, overwhelmingly high DC-DC power efficiency 89.5% and the output 22.4W are attained.
Keyword (in Japanese) (See Japanese page) 
(in English) Direct-current-resonance / class-D / GaN FET / Resonance field / Zero voltage switching / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 310, WPT2014-50, pp. 1-6, Nov. 2014.
Paper # WPT2014-50 
Date of Issue 2014-11-11 (WPT) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EE WPT  
Conference Date 2014-11-18 - 2014-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Doshisha University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To WPT 
Conference Code 2014-11-EE-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Novel ZVS Class-D Direct-Current-Resonance Wireless Power Transfer with GaN FETs Operated in 6.78MHz 
Sub Title (in English)  
Keyword(1) Direct-current-resonance  
Keyword(2) class-D  
Keyword(3) GaN FET  
Keyword(4) Resonance field  
Keyword(5) Zero voltage switching  
1st Author's Name Tatsuya Hosotani  
1st Author's Affiliation Murata Manufacturing Co. Ltd. (Murata Manufacturing)
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Speaker Author-1 
Date Time 2014-11-18 10:00:00 
Presentation Time 25 minutes 
Registration for WPT 
Paper # WPT2014-50 
Volume (vol) vol.114 
Number (no) no.310 
Page pp.1-6 
Date of Issue 2014-11-11 (WPT) 

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