Simplified 2-D Analytical Model for Winding Loss Analysis of Flyback Transformers

Junming Zhang; Wei Yuan; Hulong Zeng; Zhaoming Qian

Simplified 2-D Analytical Model for Winding Loss Analysis of Flyback Transformers

Vol. 12, No. 6, pp. 960-973, Nov. 2012

10.6113/JPE.2012.12.6.960

DCM

Flyback

Winding loss

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Abstract

The winding loss analysis of a flyback transformer is difficult and ambiguous because the primary side current and the secondary side current differs both in shape and phase, especially for DCM (Discontinuous Conduction Mode) operation. Meanwhile, the fringing field caused by the air gaps further makes the traditional 1-D loss analysis model not directly applicable. The paper gives a thorough investigation into the phase shift of winding currents, which indicates that the phase shift of the high order harmonics is still close to 180º out-of-phase. Based on the analysis, a simplified 2-D winding loss analytical model for flyback transformers considering the effects of low order harmonics is proposed. By neglecting the y components of the fringing field, the proposed model has an acceptable accuracy and a simple form that is similar to the conventional 1-D model. The power loss calculated with the proposed analysis model is verified by FEA (Finite Element Analysis) simulations and experimental results.

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Cite this article

[IEEE Style]

J. Zhang, W. Yuan, H. Zeng, Z. Qian, "Simplified 2-D Analytical Model for Winding Loss Analysis of Flyback Transformers," Journal of Power Electronics, vol. 12, no. 6, pp. 960-973, 2012. DOI: 10.6113/JPE.2012.12.6.960.

[ACM Style]

Junming Zhang, Wei Yuan, Hulong Zeng, and Zhaoming Qian. 2012. Simplified 2-D Analytical Model for Winding Loss Analysis of Flyback Transformers. Journal of Power Electronics, 12, 6, (2012), 960-973. DOI: 10.6113/JPE.2012.12.6.960.