| 摘要 |
<p>PROBLEM TO BE SOLVED: To avoid effectively unnecessary power consumption caused by erroneous closing of a power supply switch in a battery-driven electronic equipment. SOLUTION: When a switch 5, which is a power protective switch, is switched to be connected to a terminal (a) side and grounded, a control circuit 3 detects the operation of a power supply switch 2 and controls the power supply of a system power supply circuit 1. When the switch 5 is switched to a terminal (b) side, if a system power supply is in an on-state, a switch 4 is turned on and the control circuit 3 detects the operation of the power supply switch 2 and controls the power supply of the system power supply circuit 1. However, if the system power supply is in an off-state, since the switch 4 is turned off and the operation of the power supply 2 cannot be received by the control circuit 3, the power supply being turned on by the erroneous operation of the power supply switch 2 is prevented.</p> |
