Auxiliary power supply device and power supply system

An auxiliary power supply device comprising:

• a plurality of channels of auxiliary power supplies;
• a charging circuit configured to charge the auxiliary power supplies, the charging circuit being connected to a main power supply;
• and
• an auxiliary power supply switching circuit disposed between the charging circuit and positive electrode terminals of the plurality of channels of auxiliary power supplies and configured to switch one channel of auxiliary power supply connected to the charging circuit among the plurality of channels of auxiliary power supplies such that one auxiliary power supply that has been disconnected from the charging circuit is connected to the charging circuit and another auxiliary power supply that has been connected to the charging circuit is disconnected from the charging circuit, and to simultaneously switch one channel of auxiliary power supply connected to a power supply destination such that one auxiliary power supply that has been disconnected from the power supply destination is connected to the power supply destination, another auxiliary power supply that has been connected to the power supply destination is disconnected from the power supply destination, and the one channel of auxiliary power supply connected to the power supply destination does not match the one channel of auxiliary power supply connected to the charging circuit.