OPERATION DETECTION DEVICE FOR SWITCH IN EQUIPMENT WITH BACKUP POWER SOURCE

摘要

PROBLEM TO BE SOLVED: To prolong backup time by connecting an opening/closing element to a switch in series and setting an opening/closing element in an on state with a signal from a control circuit only when an on/off state is detected. SOLUTION: A transistor 6 being the opening/closing element is connected to the micro switch 4 in series with a resistor 5. A middle point between the micro switch 4 and the resistor 5 is connected to the input port 22 of a control part 2. The output port 21 of the control part 2 is connected to the base of the transistor 6. At the time of fetching in a signal from the input port 22, the control part 2 synchronously outputs the signal from the output port 21 and sets the transistor 6 in the on state. Even if the micro switch 4 becomes the on state, current does not flow in the micro switch 4 and the resistor 5 when the transistor 6 is not turned on. Thus, wasteful power consumption can be eliminated even if power is supplied from a backup power source 3.