Power supply control apparatus

A power supply control method for controlling a power supply, the method comprising the steps of:

• (a) acquiring, by a microcomputer, switching information for switching a power supply pathway supplying power to a load between (i) a first pathway supplying power from a first battery to the load and (ii) a second pathway supplying power from a second battery to the load, the first pathway including a plurality of switches, at least one of the plurality of switches being a semiconductor relay having a body diode and a switching element, the second pathway including a voltage converter;
• and
• (b) based on the switching information, switching, by the microcomputer, the power supply pathway between the first pathway and the second pathway by controlling the plurality of switches, and the voltage converter, wherein
• when the step (b) switches the power supply pathway between the first pathway and the second pathway, the step (b) activates or deactivates the voltage converter while turning off the semiconductor relay so that power is supplied to the load through the first pathway via the body diode during a time period in which the voltage converter completes an activation process or a deactivation process.