| 摘要 |
PURPOSE:To prevent a noise and suppress a rush current, by driving a heater with the second higher voltage after increasing the heater resistance by zero- cross driving with the first voltage. CONSTITUTION:When a switch 20 is turned on to supply electric power, a driving signal is outputted from a control part 12, and the first heater operating signal is outputted through a timer 13 or the like, and a 24-volt voltage is applied to a heater 11a for a heat roll for a prescribed time, and the heater 11a is heated. Next, a delay circuit 14 is turned on after the prescribed time, and a 100-volt voltage is applied to the heater 11a by the second heater operating signal. Since the heater resistance is already higher at this time, the rush current is not generated. Thus, the noise is prevented, and the rush current is suppresed. |
