| 摘要 |
This induction heater is provided with a plurality of heating coils (11a, 11b, 11c), a plurality of inverters (46, 56), a plurality of switching circuits (81a, 81b, 81c), an instruction means (23), a sensor group (21), and a pan detection means (22). The number of inverters for supplying a high-frequency current to the heating coils is smaller than the number of heating coils. The switching circuits switch the electrical path of the heating coils so as to connect the heating coils to one of the inverters or to not connect the heating coils to any of the inverters. The instruction means controls the driving of the inverters and the switching performed by the switching circuits. The sensors included in the sensor group detect the reaction of a resonance circuit that includes a heating coil in response to the supplying of power by an inverter. The pot detection means detects, according to the outputs from the sensors, whether or not an object (91) to be heated is placed on a heating coil. The present invention makes it possible to ensure safety and reduce the cost of an induction heater having a plurality of heating coils. |
