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J Electromagn Eng Sci > Volume 15(2); 2015 > Article
Journal of Electromagnetic Engineering and Science 2015;15(2):89-96.
DOI: https://doi.org/10.5515/JKIEES.2015.15.2.89   
Common Mode Noise Reduction for an LLC Resonant Converter by Using Passive Noise Cancellation
Younggon Ryu1, Sungnam Kim2, Geunseok Jeong2, Jaesu Park2, Duil Kim2, Jongwook Park2, Jingook Kim1, Ki Jin Han1
1School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology
2LG Electronics
Abstract
This paper describes the application of a passive noise cancellation method to a prototype inductor-inductor-capacitor (LLC) resonant converter by placing a compensation winding in a transformer to reduce common mode noise. The connection method for the compensation winding is investigated. A circuit analysis is implemented for the displacement currents between the primary and secondary windings in the transformer. The analyzed displacement currents are verified by performing a circuit simulation and a proper compensation winding connection that reduces common mode noise is found. The measurement results show that common mode noise is reduced effectively up to 20 dB in the 1 to 7 MHz frequency region for the prototype LLC resonant converter by using the proposed passive noise cancellation method.
Key words: Common Mode Noise, Electromagnetic Compatibility, LLC Resonant Converter, Passive Noise Cancellation
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