| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a heating device detecting connection of a lead wire or the like as a substitute for a thermal fuse while avoiding an adverse effect caused by using a detecting resistance. <P>SOLUTION: The heating device comprises: a first connection terminal 20 and a second connection terminal 21 for connecting an overheat fusing circuit 50a connecting diodes 52, 53 and the thermal fuse 51 in series; a DC power source 40 with the high potential side Va connected to the first connection terminal 20 and with the lower potential side GND connected to the second connection terminal 21; a transistor 33 and a comparator 39 for switching an output level to an input port P1 of a microcomputer 10 according to voltage between the first connection terminal 20 and the second connection terminal 21; and a heating forbidding means 13 for forbidding heating control when detecting short circuit between the first connection terminal 20 and the second connection terminal 21 by the input level of the input port P1. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
