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 |
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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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