Heating device with plural induction coils

Abstract

A heating device includes a first induction coil, a second induction coil, a first phase power unit, a second phase power unit, a power controller and a user interface unit. The second induction coil isn't always concentric with the first induction coil. The first phase power unit is connected with the first induction coil, and configured for receiving a first phase input voltage and outputting a first voltage. The second phase power unit is connected with the second induction coil, and configured for receiving a second phase input voltage and outputting a second voltage. There is a phase difference between the first phase input voltage and the second phase input voltage. The power controller is used for controlling operations of the first phase power unit and the second phase power unit. The user interface unit is connected with the power controller for controlling the power controller.

Dependencies are inferred from the claim text.