Patent ID: 6730886
Filing Date: 2004-05-04
Classification: G03G

Abstract:
A power control method for controlling a roller voltage applied to a heating resistor of an instant heating roller (IHR), comprising the steps of:(a) determining whether an external source voltage has a first predetermined level or a second predetermined level greater than the first predetermined level; (b) when it is determined that the source voltage has the first predetermined level, supplying the source voltage as the roller voltage to the heating resistor at intervals of a second predetermined time period until a temperature of the heating resistor, measured at intervals of a first predetermined time period, reaches a predetermined target fusing temperature; and (c) when it is determined that the source voltage has the second predetermined level, supplying the source voltage as the roller voltage to the heating resistor during a third predetermined time period for every half period of the source voltage until the temperature of the heating resistor, measured at intervals of the first predetermined time period, reaches the predetermined target fusing temperature; wherein, as the temperature of the heating resistor approaches the predetermined target fusing temperature, the second predetermined time period in step (b) is increased and the third predetermined time period in step (c) is decreased, and the first predetermined time period is not less than the second predetermined time period.