Patent attributes
A heating system 25 has a main electric heat-generating element 3 and a heating surface 4a for heating an object, auxiliary electric heat-generating elements 5A to 5D, and a main power source 1 for supplying power to the main heating element. The system 25 further has an auxiliary power source 2 for supplying power to the auxiliary heating elements, and a power source controller for controlling the power supplied to the main heating element and to the auxiliary heating elements respectively and independently. Power supplied to the main heating element 3 is controlled by the controller within a first power range and power supplied to the auxiliary heating elements is controlled by the controller within a second power range. The second power range has a width smaller than that of the first power range so as to control temperature distribution on the heating surface 4a.
