Power supply device

A power supply device comprising:

• a main power supply that supplies power to a load unit;
• a sub-power supply that is a power supply different from the main power supply and supplies power to the load unit;
• a main power supply path that is connected to the main power supply;
• a sub-power supply path that is a power supply path different from the main power supply path and is connected to the sub-power supply;
• a power supply selector that is switched between a first state where power can be supplied from the main power supply via the main power supply path to the load unit and a second state where power can be supplied from the sub-power supply via the sub-power supply path to the load unit;
• and
• a load supply path selector that is disposed between the main power supply path and the sub-power supply path, and the load unit, and performs switching so as to connect one of the main power supply path and the sub-power supply path to the load unit and disconnect the other of the main power supply path and the sub-power supply path from the load unit according to switching of the power supply selector, wherein
• the load supply path selector includes a main terminal connected to the main power supply path, a sub-terminal connected to the sub-power supply path, and one load terminal connected to the load unit, and the one load terminal is connected to one of the main terminal and the sub-terminal and the one load terminal is not connected to the other of the main terminal and the sub-terminal.