Patent ID: 9674898
Date: 2017-06-06
CPC Classifications: H01L,H05B

Claim:
1. An induction heating method to perform induction heating on objects to be heated which are arranged on a vertically arranged stack of a plurality of susceptors, comprising: providing a plurality of induction heating coils and a plurality of inverse coupling coils, each of the plurality of induction heating coils including a main heating coil and a subordinate heating coil electromagnetically coupled to the main heating coil, and each main heating coil being connected to a corresponding one of the plurality of inverse coupling coils, wherein the main heating coil is wound around a main heating coil core, and the subordinate heating coil and the inverse coupling coil are wound around a subordinate heating coil core, the subordinate heating coil being wound around a top end of the subordinate heating coil core and the inverse coupling coil being wound on a rear end of the subordinate heating coil core; supplying current so that adjacent ones of the plurality of induction heating coils have mutually subtractive polarities, the plurality of induction heating coils which generate horizontal magnetic flux against upper horizontal mount faces of the susceptors for objects to be heated being adjacently stacked along a laminating direction of the susceptors; separately controlling a power ratio to be supplied to respective ones of the plurality of induction heating coils, wherein the inverse coupling coil provides an additive polarity against the subordinate heating coil, the inverse coupling coil generates mutual inductance having a reverse polarity to mutual inductance generated between the main heating coil and the subordinate heating coil, and the mutual inductance generated between the induction heating coils is at least partially cancelled; rotating the susceptors in a radial direction relative to a central axis of the susceptors; and positioning the plurality of induction heating coils to be biased toward the central axis of the susceptors.