INDUCTION HEATING DEVICE AND LOAD DETECTION METHOD IN INDUCTION HEATING DEVICE

In a multi-coil induction heating device, driver (4) repeatedly supplies a detection current which is a high frequency power to a plurality of heating coils (3) at a predetermined detection cycle. Controller (50) determines whether a load is placed above the plurality of heating coils (3) based on an electric signal in response to a first detection current. Controller (50) extends the detection cycle for a heating coil which is continuously determined a predetermined number of times to have a load placed thereabove, from among the plurality of heating coils (3). When determining that a load is placed above a heating coil above which a load has not been placed, controller (50) shortens the detection cycle which is extended. According to this aspect, energy-saving and accurate load detection is possible in a short time in a multi-coil induction heating device.