| 摘要 |
PROBLEM TO BE SOLVED: To protect a power supply circuit without burdening a main body device and an external device. SOLUTION: A parallel circuit consisting of a switch and a resistor is inserted in series with a power supply line 2 from a powder supply circuit 1. Then the power supply line 2 is connected to a power supply connecting point 6 between the power supply line 2 and an external device (load resistor 5) such remote controller. Furthermore, the potential of the power supply connecting point 6 is applied to a control means to discriminate whether or not the load resistor 5 is proper. Then on/off the switch 3 is controlled by the output of the control means and the state is maintained. |
