Estimation of Optimum Value of Y-Capacitor for Reducing Emi in Switch Mode Power Supplies

• Autorzy: Jha M. M. , Naik K. B. , Das S. P.
• Języki publikacji: EN

Abstrakty

EN

Putting a Y-capacitor between the primary ground and secondary ground is a common practice in industry to reduce EMI; but, this capacitor increases touch current. A method is discussed to measure the touch current at circuit design level. An optimum value of Y-capacitor is predicted without exceeding touch current limit. Experimental results of touch current measurements and EMI measurements are analyzed.

Słowa kluczowe

EN

EMI; CM noise; touch current; Y-capacitor

• Wydawca: AGH University of Science and Technology ; Lodz University of Technology
• Czasopismo: Electrical Power Quality and Utilisation. Journal
• Rocznik: 2009
• Tom: Vol. 15, iss. 2
• Strony: 47--50
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Jha M. M.

• Saraswati Institute of Technology and Management, India

autor

Naik K. B.

• College of Engineering Science and Technology, India

autor

Das S. P.

• Indian Institute of Technology, Kanpur, India

Bibliografia

• 1. Nagrial M.H. and Hellany A.: 1. EMI/EMC issues in SMPS. EMC New York 1999, Conference Publication No. 464, IEE, pp 180-185.
• 2. Wu Xin, Pong M.H., Lee C.M. and Qian Z.M.: 2. Reduction of EMI by Electric Field Method. Applied Power Electronics Conference and Exposition, 1999 APEC apos, 99, Fourtinth Annual, Vol.1, Issue, 14-18 Mar 1999, pp 135-138.
• 3. Fellic G. and Evans R.: 3. Study of Heat Sink Effects in SMPS Circuits. EMC, 2001 IEEE international Symposium on, Publication Date: 2001, Vol. 1, pp254-259.
• 4. Schanen J.L., Jourdan L. and Roudet J.: 4. Layout Optimization to reduce EMI of a Switched Mode Power Supply. Power Electronics Specialists Conference, 2002, IEEE, 33rd Annual, Vol. 4, Issue 2002, pp 2021-2026.
• 5. Kaewchai J., Khan-ngern W. and Nitta S.: 5. A snubber for reducing reverse recovery current to EMI reduction in Boost converter. Proceedings of 2002 International Conference on Electromagnetic Compatibility, Bangkok, Thailand, July 24-27, 2002, pp 57-61.
• 6. Pingping Chen, Honghao Zhong, Zhaoming Quian 6. and Zhengyu Lu: The passive EMI cancellation Effects of Y-capacitor and CM model of Transformers used in SMPS. 35th Annual IEEE Power Electronics Specialists Conference, Aschen, Germany, 2004, pp 1076-1079.
• 7. Hung-I Hsieh, Lion Huwang, Ttian-Chi Lin and 7. Dan Chen: Use of a CZ Common-Mode Capacitor in Two-Wire and Three-Wire Offline Power Supplies. IEEE Transactions on Industrial Electronics, Vol.55, No.3, march 2008, pp 1435-1443.
• 8. IS:302, Part I, “Safety of Electrical Equipment”, 1989.8.
• 9. IEC 60950, “Touch Current – Limits and methods of Measurements”, 9. Third Edition, 1999-04.
• 10. CISPR 22 © IEC 2003, Information Technology Equipments 10. – Radio Disturbance Characteristics – Limits and Methods of Measurements”.