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Paper Abstract and Keywords
Presentation 2017-11-22 13:00
Magnetic Near-Field Noise Measurement and Improvement of Power Efficiency of LED Bulb without Switching Circuit
Shunsuke Koyanagi (Akita Univ.), Katsutoshi Saito (Saikatu), Motoshi Tanaka (Akita Univ.) EMCJ2017-68
Abstract (in Japanese) (See Japanese page) 
(in English) A low-noise LED bulb is required for an anechoic chamber and a measurement room of biomedical signals. Magnetic near-field noise was measured in the case changing the arrangement of six LED bulbs without switching circuit. As a result, the near-field strength in any cases was smaller than that in the cases of LED bulbs with switching circuit. The LED bulbs under test had been designed for low noise and low heat generation, so that the current to LED elements is small and the illuminance is small. A circuit was proposed, in which capacitance of the current limiting capacitor was increased for the increase of the current to LED elements and a inductor was inserted in series to improve the power factor. In results, the increase of the near-field strength was small, and the illuminance and the efficiency were improved.
Keyword (in Japanese) (See Japanese page) 
(in English) LED Bulb / Magnetic near-field noise / High efficiency / Illuminance / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 319, EMCJ2017-68, pp. 23-28, Nov. 2017.
Paper # EMCJ2017-68 
Date of Issue 2017-11-15 (EMCJ) 
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 EMCJ  
Conference Date 2017-11-22 - 2017-11-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Young Scientist Meeting 
Paper Information
Registration To EMCJ 
Conference Code 2017-11-EMCJ 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Magnetic Near-Field Noise Measurement and Improvement of Power Efficiency of LED Bulb without Switching Circuit 
Sub Title (in English)  
Keyword(1) LED Bulb  
Keyword(2) Magnetic near-field noise  
Keyword(3) High efficiency  
Keyword(4) Illuminance  
1st Author's Name Shunsuke Koyanagi  
1st Author's Affiliation Akita University (Akita Univ.)
2nd Author's Name Katsutoshi Saito  
2nd Author's Affiliation Saikatu Inc. (Saikatu)
3rd Author's Name Motoshi Tanaka  
3rd Author's Affiliation Akita University (Akita Univ.)
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Date Time 2017-11-22 13:00:00 
Presentation Time 25 
Registration for EMCJ 
Paper # IEICE-EMCJ2017-68 
Volume (vol) IEICE-117 
Number (no) no.319 
Page pp.23-28 
#Pages IEICE-6 
Date of Issue IEICE-EMCJ-2017-11-15 

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