This paper proposes a new induction heating technology capable of controlling a precise exothermic distribution,
which is named as “zone-control induction heating (ZCIH).” The ZCIH system consists of two
or more sets of a high-frequency inverter unit and a work coil. The inverter units control the phase angle
of the coil current to be in phase with each other. The ZCIH has capability of operation with the mutual
inductance, and enables to locate the coils as close as possible. As a result, the ZCIH technology makes it
possible to achieve rapid heating performance with extremely precise exothermic distribution. This paper
presents experimental results of a 150-kW six-zone ZCIH system for semiconductor heat processing.
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