| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such a problem that the problem occurs in a heater due to an overcurrent at the time of power supply connection having high effective voltage in the case where an AC power supply and a DC power supply having different effective voltages are utilized and then the same heater 15 is used. <P>SOLUTION: A heater control device 20 is capable of receiving the supply of power from one of an AC power supply and a DC power supply and includes: a heater command signal 50 generated from a heater ON/OFF signal generating circuit 49; a comparator 44 which discriminates which of the AC power supply or the DC power supply is connected; and a switch 28 which controls an on/off state of the heater. A protection circuit 60 is also provided which detects the control abnormality from an output state of the switch 28 and cuts off a power supply to a heater 15. In the case where abnormality occurs at the time of DC power supply connection having high effective voltage, the supply of power to the heater 15 is stopped by the protection circuit 60 and a relay 26a. <P>COPYRIGHT: (C)2013,JPO&INPIT |
