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Reduction of EMI in planar transformers by charge balancing

Reduction of EMI in planar transformers by charge balancing

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Published

A simple method of reducing the commonmode electromagnetic interference (EMI) of a switching circuit employing a planar wound transformer is presented. The method is based on the concept of charge balance being maintained within the transformer during a switching event. Charge balance is ensured by means of a compensating planar shield winding.

Inspec keywords: electromagnetic shielding; electromagnetic interference; transformer windings; switched mode power supplies

Other keywords: planar shield winding; planar transformers; charge balance; EMI; wound transformer; common-mode electromagnetic interference; switching event; charge balancing

Subjects: Inductors and transformers; Electromagnetic compatibility and interference; Power electronics, supply and supervisory circuits

References

    1. 1)
      • Xin, W., Poon, F.N.K., Lee, C.M., Pnog, M.H., Qian, Z.: `A study of common mode noise in a switching power supply from a current balancing viewpoint', IEEE Conf. on Power Electronics and Drive Systems, PEDS 1999, Hong Kong, p. 621–625.
    2. 2)
      • Ferreira, J.A., Hofsajer, I.W., Van Wyk, J.D.: `Exploiting the third dimension in power electronics packaging', IEEE Applied Power Electronics Conf., APEC 1997, Vancouver, Canada, 1, p. 419–423.
    3. 3)
      • Ning, D., Lee, F.C.: `Design of a high density low profile transformer', IEEE Applied Power Electronics Conf., APEC 1996, San Jose, CA, USA, 1, p. 343–440.
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