An interleaved structure for a high-voltage planar transformer for a Travelling-Wave Tube

Fully interleaved structure can significantly reduce leakage inductance in transformers. However, it is hard to apply them into high-voltage applications due to the electric insulation. In this paper, a partially interleaved structure that is suitable for high-voltage high frequency applications is proposed to reduce leakage inductance and the insulation's thickness is adjusted to optimize the electric isolation. In addition, the resistance and parasitic capacitance are investigated. With this method, a planar transformer used for a Travelling-Wave Tube Amplifier (TWTA) is designed. Calculations of leakage inductances and experimental results validate the effectiveness of the proposed method.

[1]  W. G. Hurley,et al.  Calculation of Leakage Inductance for High-Frequency Transformers , 2015, IEEE Transactions on Power Electronics.

[2]  Michael A. E. Andersen,et al.  Overview of Planar Magnetic Technology—Fundamental Properties , 2014, IEEE Transactions on Power Electronics.

[3]  J. Volakis,et al.  A S-band high power traveling wave tube for RADAR application , 2014, 2014 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium).

[4]  Jun Zhang,et al.  Leakage Inductance Calculation for Planar Transformers With a Magnetic Shunt , 2014, IEEE Transactions on Industry Applications.

[5]  William Gerard Hurley,et al.  Transformers and Inductors for Power Electronics: Theory, Design and Applications , 2013 .

[6]  Michael A. E. Andersen,et al.  Optimal Design and Tradeoff Analysis of Planar Transformer in High-Power DC–DC Converters , 2012, IEEE Transactions on Industrial Electronics.

[7]  Michael A. E. Andersen,et al.  Low profile, low cost, new geometry integrated inductors , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[8]  K. S. Dasgupta,et al.  Design and realization challenges of power supplies for space TWT , 2011, 2011 IEEE International Vacuum Electronics Conference (IVEC).

[9]  Michael A. E. Andersen,et al.  The analysis and comparison of leakage inductance in different winding arrangements for planar transformer , 2009, 2009 International Conference on Power Electronics and Drive Systems (PEDS).

[10]  Bai Feng,et al.  EMI Modeling and Simulation of High Voltage Planar Transformer , 2006, 2006 International Conference on Power Electronic, Drives and Energy Systems.

[11]  Bai Feng,et al.  Finite Element Analysis of High Voltage Planar Transformer , 2006, 2006 7th International Symposium on Antennas, Propagation & EM Theory.