Dynamic load impedance matching for induction heater systems

Abstract

It is not normally possible to heat a static steel work‐piece past the Curie temperature without incurring reduced inverter utilisation. Since the inverter cost increases with rated power, reduced utilisation implies an increase in investment costs for a given performance. The paper shows that third‐order resonant work‐head circuits can intrinsically allow better utilisation of the inverter for variable‐load heating operations. A further refinement is then shown to allow control of the load impedance, thereby allowing the utilisation to approach 100 percent over the heating cycles.

Citation

Sewell, H.I., Stone, D.A. and Bingham, C.M. (2003), "Dynamic load impedance matching for induction heater systems", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 22 No. 1, pp. 30-38. https://doi.org/10.1108/03321640310451999