An electromagnetic-based model for calculating the efficiency in domestic induction heating appliances

An electromagnetic-based model for calculating the efficiency of litz-wire planar inductors for domestic induction heating appliances is developed. This efficiency will be determined by the relationship between the losses in the windings and the power delivered by eddy currents in the vessel. Therefore, it will depend on the geometry and properties of the vessel as well as winding parameters. Considering both dependences simultaneously, an analytical model of the induction efficiency is developed and experimentally verified in this paper. The model includes the dependences of the excitation current frequency and the properties of the load and windings. In this study the model is used to design the optimum number of strands of the litz wire used for windings, and to test the induction efficiency of different loads.

[1]  E. Davies.  Conduction and Induction Heating , 1990 .

[2]  J. Acero,et al.  Asymmetrical voltage-cancellation control for full-bridge series resonant inverters , 2004, IEEE Transactions on Power Electronics.

[3]  J.D. van Wyk,et al.  Design of the half-bridge, series resonant converter for induction cooking , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[4]  L. A. Barragan,et al.  Analytical equivalent impedance for a planar circular induction heating system , 2006, IEEE Transactions on Magnetics.

[5]  Fred C. Lee,et al.  A high frequency model for Litz wire for switch-mode magnetics , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[6]  W. C. Moreland,et al.  The Induction Range: Its Performance and Its Development Problems , 1973 .

[7]  Charles R. Sullivan.  Optimal choice for number of strands in a litz-wire transformer winding , 1997 .

[8]  J. Acero,et al.  Frequency-dependent resistance in Litz-wire planar windings for all-metal domestic induction heating appliances , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..

[9]  W. G. Hurley,et al.  Calculation of self and mutual impedances in planar magnetic structures , 1995 .

[10]  Francois Costa,et al.  Principle of a multi-load/single converter system for low power induction heating , 2000 .

[11]  J.D. van Wyk,et al.  Investigating the influence of material properties on the efficiency of an induction heating load transformer using FEM simulations , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[12]  Irene A. Stegun,et al.  Handbook of Mathematical Functions. , 1966 .

[13]  George H. Brown,et al.  Theory and application of radio-frequency heating , 1947 .

[14]  M. Kazimierczuk,et al.  Resonant Power Converters , 1995 .

[15]  F. Monterde,et al.  A comparative study of resonant inverter topologies used in induction cookers , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).