| 摘要 |
PROBLEM TO BE SOLVED: To reduce the power consumption at sleep of a cordless apparatus, by making a power controller cut a switch under specified conditions, and connect the switch when it has detected a trigger signal, thereby enabling a DC-DC converter to be supplied with power from a current source. SOLUTION: In case that there is no change for a certain time in the signal inputted into the specified terminal of a system controller 1 or a power controller 7, the power controller 7 cuts off a switch 8 to put it in sleep condition, whereby power ceases to be supplied to a DC-DC converter 4, the system controller 1, and each device 10. When a push button or the like is pushed by a user and a trigger signal is sent to the power controller 7 from a trigger transmitter 5 and a one-chip microcomputer detects a voltage change, it calls off the sleep condition and connects the switch 8, and the system controller 1 and each device 10 are supplied with power. As a result, the consumption of power can be reduced. |
