| 摘要 |
PROBLEM TO BE SOLVED: To reduce the power consumption of a battery in a power-supply switching circuit.SOLUTION: When a power-supply voltage of a main power source exceeds a predetermined reference voltage, a first control-signal output section outputs a signal exceeding a predetermined potential as a first control signal by using the main power source. When the potential of the first control signal does not exceed the predetermined potential, a second control-signal output section outputs a signal exceeding the predetermined potential as a second control signal by using a preliminary power source from a battery. An output control section outputs the main power source when the first control signal exceeds the predetermined potential, and outputs the preliminary power source when the second control signal exceeds the predetermined potential. |
