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Paper Abstract and Keywords
Presentation 2017-11-22 10:00
A Study on Broadband Operation of Feedback-Type Common-Mode Noise Suppressor Using Two Ferrite Cores
Soichiro Yoshikawa, Atsuhiro Nishikata (Tokyo Tech), Farhan Mahmood (NTT) EMCJ2017-65
Abstract (in Japanese) (See Japanese page) 
(in English) In order to suppress conductive noise, a common mode suppression device which constitutes negative feedback with two ferrite cores and an amplifier circuit has been studied. In the configuration using the voltage-driving amplifier circuit, the suppression effect as much as the theoretically calculated value can not be obtained in actual measurement in lower frequency side of several 100 kHz or less. Besides, the noise amplification effect appeared in higher frequency side in the vicinity of 10 MHz. The performance degradation in lower frequencies is caused by the output saturation of the operational amplifier and can be solved by combining multiple amplifying circuits in parallel, and the frequency band of 20 dB suppression extended from 300 kHz-1.4 MHz to 140 kHz-2.8 MHz. Next, in order to solve the noise amplification problem in higher frequencies, the amplifier circuit was changed to the current-driving type. As a result, we succeeded in mitigating the noise amplification. The suppression band was 70 kHz-1.4 MHz, and the low frequency characteristic was improved. However, steep noise amplification peak newly appeared on the lower frequency side. Then, it was halved by adding a phase compensator.
Keyword (in Japanese) (See Japanese page) 
(in English) Conductive noise / Common mode / Ferrite core / Feed back / Filter / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 319, EMCJ2017-65, pp. 7-11, Nov. 2017.
Paper # EMCJ2017-65 
Date of Issue 2017-11-15 (EMCJ) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 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) A Study on Broadband Operation of Feedback-Type Common-Mode Noise Suppressor Using Two Ferrite Cores 
Sub Title (in English)  
Keyword(1) Conductive noise  
Keyword(2) Common mode  
Keyword(3) Ferrite core  
Keyword(4) Feed back  
Keyword(5) Filter  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Soichiro Yoshikawa  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Atsuhiro Nishikata  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Farhan Mahmood  
3rd Author's Affiliation Nippon Telegraph and Telephone Corporation (NTT)
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Speaker Author-1 
Date Time 2017-11-22 10:00:00 
Presentation Time 25 minutes 
Registration for EMCJ 
Paper # EMCJ2017-65 
Volume (vol) vol.117 
Number (no) no.319 
Page pp.7-11 
#Pages 5 
Date of Issue 2017-11-15 (EMCJ) 

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