Power source control device and method for controlling power source control device

A power source control device configured to accumulate power generated by a power source in a power storage element, the power source control device comprising:

• a DC-DC converter for converting power input through an input power feeder into a predetermined voltage to supply the predetermined voltage to a load connected to an output power feeder, the DC-DC converter being configured to be activated to start power feeding when an input-side voltage exceeds a first predetermined voltage, and stop operating when the input-side voltage becomes lower than a second predetermined voltage that is lower than the first predetermined voltage;
• a power supply switch inserted between the output power feeder and the load, for controlling power supply;
• a power-source energy detecting section connected to an input side of the DC-DC converter, for detecting a power source energy of the power source;
• and
• a power source control section comprising a microcomputer, which is connected to the output power feeder so as to be supplied with power to operate, for controlling the power supply to the load while changing an operation mode in accordance with the power source energy of the power source,
• wherein the power source control section is activated by the start of the power supply by the DC-DC converter to operate in a low power-consumption operation mode in which only the power source energy detected by the power-source energy detecting section is periodically monitored, and closes the power supply switch to start the power supply to the load when the power source energy exceeds a first level corresponding to a state in which the voltage of the input power feeder becomes equal to a third predetermined voltage higher than the first predetermined voltage.