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Common Mode Noise Reduction for an LLC Resonant Converter by Using Passive Noise Cancellation

  • Ryu, Younggon (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Sungnam (LG Electronics) ;
  • Jeong, Geunseok (LG Electronics) ;
  • Park, Jaesu (LG Electronics) ;
  • Kim, Duil (LG Electronics) ;
  • Park, Jongwook (LG Electronics) ;
  • Kim, Jingook (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology) ;
  • Han, Ki Jin (School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2014.12.08
  • Accepted : 2015.04.06
  • Published : 2015.04.30

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.

Keywords

References

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Cited by

  1. Design Considerations of Resonant Network and Transformer Magnetics for High Frequency LLC Resonant Converter vol.11, pp.2, 2016, https://doi.org/10.5370/JEET.2016.11.2.383
  2. Efficient Circuit and an EM Model of an Electrostatic Discharge Generator vol.60, pp.4, 2018, https://doi.org/10.1109/TEMC.2017.2787189