| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control unit lowering noise and switching loss at start of an on/off operation of a switching element. <P>SOLUTION: The unit is provided with a switching control means 11 making an on/off operation of the switching element 8, and a zero-cross detection circuit 12 detecting zero crossing of voltage of an alternate current power source 1. The switching control means 11 waits until a zero-cross signal is inputted from the zero-cross detection circuit 12 after a request-for-heating signal is inputted, and starts the on/off operation of the switching element 8 at a point where the voltage of the alternate current power source 1 gets zero. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
