| 摘要 |
A heater controller is provided. The heater controller includes a switching unit which switches a conduction state of a heater with an AC power source between ON and OFF at a timing at which an AC power voltage becomes zero; and a control unit which controls the switching unit at each unit interval corresponding to a half wave period of the AC power voltage. The control unit outputs a switch signal for switching the conduction state based on a pattern in a control time period set as an integral multiple of the half wave period. In the pattern, ON intervals in which the conduction state is to be ON, and OFF intervals in which the conduction state is to be OFF are arranged so that one of the ON intervals and the OFF intervals, a number of which is smaller are not successive within the control time period.
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