| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an interlock system which controls a rush current properly with simple circuits, without increasing cost, and without posing any problem to the heat generation etc. of a switching circuit, in the interlock system which is mounted on a small recording device and a conveying device in which current capacity to a load to be connected is small and the switching of power supply is needed for safety. <P>SOLUTION: Immediately after an open/closed state detection circuit detects that an interlock switch, which opens and closes a feed line, is changed over form an open state to a closed state, the feed line from a power source to a load is changed to a route that passes only a resistor element excluding a power supply transistor. At this time, the rush current that flows in the feed line charges a capacitor connected between the feed line and the ground to prevent the rush current from flowing to the load. After the lapse of a predetermined delay time from the detection that the interlock switch is changed over from the open state to the closed state, the feed line is changed over to a route that passes the power supply transistor. <P>COPYRIGHT: (C)2010,JPO&INPIT |
