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Winding Techniques

D11.5 - A New Winding Structure for Balance Technique Considering Soft Saturation Characteristics of Powder Cores

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
The balance technique is an effective method for reducing common-mode (CM) noise by generating an out-of-phase current using an auxiliary winding, without requiring additional components. However, the auxiliary winding is typically limited to a single turn, resulting in a low coupling coefficient. Furthermore, due to the soft saturation characteristics of the powder core, load current causes changes in permeability, which may disrupt the balance condition. This may reduce the effectiveness of noise suppression. This study proposes a new winding structure that achieves a high coupling coefficient while maintaining single-turn constraint. The proposed structure achieves a high coupling coefficient independent of load conditions and maintains the balance condition, as demonstrated through static magnetic field analysis. The CM noise in the conventional structure and the proposed structure is experimentally compared under various load conditions.