EMI Noise Source Reduction of Single-Ended Isolated Converters Using Secondary Resonance Technique

다국어 초록 (Multilingual Abstract)

Aiming at the problems of large dv/dt and di/dt in traditional single-ended converters and high electromagnetic interference (EMI) noise levels, a single-ended isolated converter using the secondary resonance technique is proposed in this paper. In the proposed converter, the voltage stress of the main power switch can be reduced and the voltage across the output diode is clamped to the output voltage when compared to the conventional flyback converter. In addition, the peak current stress through the main power switch can be decreased and zero current switching (ZCS) of the output diode can be achieved through the resonance technique. Moreover, the EMI noise coupling path and an equivalent model of the proposed converter topology are presented through the operational principle of the proposed converter. Analysis results indicate that the common mode (CM) EMI noise and the differential mode (DM) EMI noise of such a converter are deduced since the frequency spectra of the equivalent controlled voltage sources and controlled current source are decreased when compared with the traditional flyback converter. Furthermore, appropriate parameter selection of the resonant circuit network can increase the equivalent impedance in the EMI coupling path in the low frequency range, which further reduces the common mode interference. Finally, a simulation model and a 60W experimental prototype of the proposed converter are built and tested. Experimental results verify the theoretical analysis.

참고문헌 (Reference)

1 P. Kong, "Transformer structure and its effects on common mode EMI noise in isolated power converters" 1424-1429, 2010

2 D. Hamza, "Suppression of common-mode input electromagnetic interference noise in DC–DC converters using the active filtering method" 4 (4): 776-784, 2011

3 J. M. Kwon, "Single-switch quasi-resonant converter" 56 (56): 1158-1163, 2009

4 P. Kong, "Reducing common-mode noise in two-switch forward converter" 26 (26): 1522-1533, 2011

5 M. A. Saket, "Planar Transformers with near-zero common-mode noise for flyback and forward converters" 33 (33): 1554-1571, 2018

6 M. Mohammadi, "Passive lossless snubber for double-ended flyback converter" 8 (8): 56-62, 2014

7 D. Cochrane, "Passive cancellation of common-mode noise in power electronic circuits" 18 (18): 756-763, 2003

8 K. B. Park, "PWM resonant single-switch isolated converter" 24 (24): 1876-1886, 2009

9 W. Cheng, "Novel Hybrid Analytical/Numerical Conducted EMI Model of a Flyback Converter" 59 (59): 488-497, 2017

10 L. Yiming, "Investigating CM voltage and its measurement for AC/DC power adapters to meet touchscreen immunity requirement" 60 (60): 1102-1110, 2018

11 G. Spiazzi, "High step-up ratio flyback converter with active clamp and voltage multiplier" 26 (26): 3205-3214, 2011

12 J. Stahl, "Effective CM reduction in a flyback by means of passive cancellation" 1137-1143, 2013

13 B. G. Kang, "EMI reduction technique of flyback converter based on capacitance model of transformer with wire shield" 163-169, 2015

14 M. R. Yazdani, "EMI analysis and evaluation of an improved ZCT flyback converter" 26 (26): 2326-2334, 2011

15 H. Chen, "Determination of transformer shielding foil structure for suppressing common-mode noise in flyback converters" 52 (52): 1-9, 2016

16 M. R. Yazdani, "Conducted electromagnetic interference evaluation of forward converter with symmetric topology and passive filter" 7 (7): 1113-1120, 2013

17 M. R. Yazdani, "Conducted electromagnetic interference analysis and mitigation using zero-current transition soft switching and spread spectrum techniques" 5 (5): 1034-1041, 2012

18 K. Mainali, "Conducted EMI mitigation techniques for switch-mode power converters : A survey" 25 (25): 2344-2356, 2010

19 Y. P. Chan, "Common-mode noise cancellation by an antiphase winding in multilayer isolated planar transformer" 56 (56): 67-73, 2014

20 S. Yang, "Common mode EMI noise reduction technique by shielding optimization in isolated converters" 622-625, 2016

21 Mohammad Rouhollah Yazdani, "Classification and Comparison of EMI Mitigation Techniques in Switching Power Converters – A Review" 전력전자학회 11 (11): 767-777, 2011

22 P. Meng, "Characterizing noise source and coupling path in flyback converter for common-mode noise prediction" 1704-1709, 2011

23 W. Cheng, "Analysis of commonmode electromagnetic interference noise in a flyback converter using a self-supply power control integrated circuit" 8 (8): 1749-1757, 2015

24 C. Korte, "A novel spectral control method for an automotive gallium nitride DC-DC converter" 1-7, 2017

25 J. J. Shieh, "A family of offline SMPSs used in FCL with reducing secondary-side CM noise" 193-197, 2013

26 Mohammad Rouhollah Yazdani, "A ZCT Double-Ended Flyback Converter with Low EMI" 전력전자학회 15 (15): 602-609, 2015

27 Zhang-yong Chen, "A Secondary Resonance Soft Switching Half Bridge DC-DC Converter with an Inductive Output Filter" 전력전자학회 17 (17): 1391-1401, 2017