Zone Controlled Induction Heating (ZCIH) A New Concept in Induction Heating

Robustness of a resonant controller for a multiphase induction heating system

“…Consequently, measurements were achieved, for the real and imaginary parts of the global impedances including the coupling terms. A specific measurement procedure based on the "pseudo-energy" method from V and I measurements as previously described in [11] for a 1500Hz resonant frequency, leads to the values of the impedance matrix are given by (4) (4) In order to reach a flat temperature profile in the heated metal sheet according to the principles presented in [8][9] [10], the reference currents have to be optimized through an optimization procedure. One of the best combinations of the supply currents is recalled in Table I for a required power density distribution of 10MW/m 3 in a 0.45 radius disc made of stainless steel.…”

“…A study of the temperature control is present but does not take into account the coupling between the inductors. Papers [4] [5] incorporate structures of [6] to achieve control of the currents in the inductors. For this, two methods are proposed.…”

“…For this, two methods are proposed. The first [4] deals with the regulation of the amplitude and phase currents. The second [5] focuses on the real and imaginary parts of the currents.…”

Effect of multi-layered induction coils on efficiency and uniformity of surface heating

“…The eddy-current loss of a disc-type spiral coil has a non-uniform distribution at its central and external surfaces. This problem can be effectively eliminated using multi-coils that conduct various frequencies [10]. However, this approach requires various high-frequency induction heaters and the control of the various frequencies.…”

Mutual Impedance of Small Ring-Type Coils for Multiwinding Induction Heating Appliances

“…The first approach presents some advantages such as independent power control, automatic load detection of each coil, and improvement of the flexibility when coils are grouped forming unit burners. Moreover, in [3] and [4], additional advantages, such as maximizing the power delivered in the workpiece, are achieved. However, in domestic applications, where the price of the cooktop is an important issue, the cost is penalized with respect to multipleoutput power converters in which some elements can be shared by several inverters.…”