| 摘要 |
A power control method and an apparatus for an instant heating roller (IHR) include the following steps and functions: (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 the 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. As the temperature of the heating resistor approaches the predetermined target fusing temperature, the second predetermined time period is increased in step (b) and the third predetermined time period is decreased in step (c), and the first predetermined time period is equal to or greater than the second predetermined time period. As a result, the power control method and apparatus stably supply source voltage to the heating resistor of the IHR, even when the level or frequency of the external source voltage changes. In addition, the occurrence of overshoot, due to a rapid rate of temperature increase of the IHR, is minimized and the temperature of the IHR can stably reach a target fusing temperature. Power consumption during a printing operation is reduced with minimal occurrence of flicker.
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