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Paper Abstract and Keywords
Presentation 2025-10-02 09:50
Derivation of k,Q-notation Fixed-form Vo Theoretical Formula and Linking Important Indicators of Wireless Power Transfer (Part 1) -- Load Voltage Characteristics Interpreted from Fixed-form Formula Structure for X-S type Magnetic Coupled Configurations and Relationship with Efficiency/Power --
Hideaki Abe (F3rd mc wptLab) WPT2025-21
Abstract (in Japanese) (See Japanese page) 
(in English) In magnetic coupled wireless power transfer, the load voltage Vo-load resistance R characteristics take on a variety of forms depending on the combined circuit method, including the magnetic coupling form, resonance form, and drive method. The corresponding power and efficiency characteristics are also diverse. Author has been exploring the mechanisms that determine these Vo-R characteristics. It is known ηmaxkQ theoretical formula gives maximum efficiency in wireless power transfer. It is a simple formula expressed mainly in k and Q, and the efficiency characteristics can be read from the formula structure. In this study, attempted to derive theoretical formula in k,Q notation that represents Vo-R characteristics of a representative circuit method. As a result, author was able to identify theoretical formulas for Vo in k,Q notation that match or approximate theoretical characteristics. It is a simple formula expressed mainly in terms of k and Q, and confirmed its usefulness in understanding the mechanisms behind the various Vo-R characteristics and magnitude of the values from the formula structure. Furthermore, from this formula, identified relationships with important power and efficiency indicators.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless Power Transfer / Magnetic Coupling / k,Q Notation Vo Theoretical Formula / Vo-R Characteristics / ηmax kQ Theoretical Formula / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 193, WPT2025-21, pp. 1-6, Oct. 2025.
Paper # WPT2025-21 
Date of Issue 2025-09-25 (WPT) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 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 2025-10-02 - 2025-10-03 
Place (in Japanese) (See Japanese page) 
Place (in English) Recreation Facility Panasonic Resort Osaka 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To WPT 
Conference Code 2025-10-EE-WPT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Derivation of k,Q-notation Fixed-form Vo Theoretical Formula and Linking Important Indicators of Wireless Power Transfer (Part 1) 
Sub Title (in English) Load Voltage Characteristics Interpreted from Fixed-form Formula Structure for X-S type Magnetic Coupled Configurations and Relationship with Efficiency/Power 
Keyword(1) Wireless Power Transfer  
Keyword(2) Magnetic Coupling  
Keyword(3) k,Q Notation Vo Theoretical Formula  
Keyword(4) Vo-R Characteristics  
Keyword(5) ηmax kQ Theoretical Formula  
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1st Author's Name Hideaki Abe  
1st Author's Affiliation F3rd mc wptLab (F3rd mc wptLab)
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Speaker Author-1 
Date Time 2025-10-02 09:50:00 
Presentation Time 30 minutes 
Registration for WPT 
Paper # WPT2025-21 
Volume (vol) vol.125 
Number (no) no.193 
Page pp.1-6 
#Pages 6 
Date of Issue 2025-09-25 (WPT) 

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