Strongly Coupled Outer Squircle-Inner Circular Coil Architecture for Enhanced Induction Over Large Areas

Creative Commons License

Kilic V. T., Unal E., Gonendik E., Yilmaz N., Demir H. V.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol.63, no.12, pp.7478-7487, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 63 Issue: 12
  • Publication Date: 2016
  • Doi Number: 10.1109/tie.2016.2594228
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.7478-7487
  • Keywords: Coils, energy efficiency, induction heating, inductive power transmission, wireless energy transfer, SERIES-RESONANT INVERTER, COOKING APPLIANCES, PLANAR WINDINGS, HEATING APPLIANCES, LITZ-WIRE, OPTIMIZATION, RESISTANCE
  • Abdullah Gül University Affiliated: Yes


This paper reports a newly designed class of strongly coupled planar coil structures for the purpose of enhanced induction over large areas. These new architectures feature a squircle shape at the outer rim with rounded corners and straight sides evolved into a fully circular shape in the inner side, which proves to be essential to achieve high efficiency in arrays and all-surface inductive heating. As a proof-of-demonstration, a simple inductive heating system composed of a pair of side-by-side placed coils was constructed together with a ferrite layer. Experiments were repeated for 0 degrees and 180 degrees phase differences between coil currents. Here, the system efficiency was shown to be increased overall by 37.4% using outer squircle-inner circular coils instead of conventional circular coils. This comparative study indicates that the proposed coil architecture offers the potential for large-area, fast, and phase-insensitive inductive heating with high efficiency.