| 摘要 |
PROBLEM TO BE SOLVED: To more reliably switch two loads at the same zero-cross point.SOLUTION: A switching control circuit 85 of a heater control section 61 outputs a non-conduction signal to one of a first switching section 70 and a second switching section 75 while outputting a conduction signal to the other thereof at timing when a predetermined delay time period D has elapsed from a zero-cross point of an AC power source 10 detected by a zero-cross detecting section 80. Further, when the conduction signal or non-conduction signal is input, the first switching section 70 brings a first load 46 into a conductive state or a non-conductive state at the zero-cross point of the AC power source 10 immediately after the conduction signal or non-conduction signal is input. When the conduction signal or non-conduction signal is input, the second switching section 75 similarly brings a second load 47 into the conductive state or the non-conductive state at the zero-cross point of the AC power source 10 immediately after the conduction signal or non-conduction signal is input. Thus, the two first and second loads 46 and 47 can be more reliably switched at the same zero-cross point. |
