Patent ID: 8890042
Filing Date: 2014-11-18
Classification: H05B

Abstract:
1. An induction heating device comprising: a plurality of induction heating coils which are disposed adjacent to each other; a plurality of capacitors connected in series to the plurality of the induction heating coils, respectively, to form series resonant circuits; a plurality of inverters for converting a DC voltage into high frequency voltages, respectively, and applying the high frequency voltages to the series resonant circuits, respectively; and a control circuit configured to perform pulse width control of the high frequency voltages, as well as to control the plurality of the inverters so as to align phases of coil currents respectively flowing through the plurality of the induction heating coils, wherein the control circuit is configured to operate the plurality of the inverters with a same frequency and current synchronization, and to control a phase difference between a high frequency voltage generated from a specific inverter, which, compared to other inverters, supplies the maximum power to an associated induction heating coil, and a coil current that flows through an associated series resonant circuit so as to become the minimum phase angle, with which the high frequency voltage does not have a lagging phase at any frequency relative to the coil current, and wherein the DC voltage applied to the plurality of the inverters is set so that the high frequency voltages have greater values than respective mutual induction voltages caused by the induction heating coils adjacent to each other.