| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress an error of heater energization timing caused by voltage fluctuation of an AC power supply. <P>SOLUTION: A heating device comprises: a triac 65 that is provided on a current application path connecting a heater 60 to an AC power supply 101 and is conducted by an input of a control signal; a zero cross detection circuit 67 that outputs a zero-cross pulse signal Sr corresponding to a zero-cross point of an output voltage V of the AC power supply 101; a storage section 52 that stores data of a pulse width of the zero-cross signal Sr when the triac 65 is in a non-conduction state; and a control section 50 that controls energizing time of the heater by outputting the control signal to the triac 65, at a timing corresponding to a half period of the pulse width stored by the storage section 52, on the basis of rising or falling of the zero-cross pulse signal. <P>COPYRIGHT: (C)2013,JPO&INPIT |
