Power supply system including an electrical machine with its neutral point connected to a power supply unit

A power supply system including a power supply unit composed of a serial connection in which a plurality of storage batteries are connected in series, the power supply system comprising:

• an inverter that is connected to the power supply unit via a positive electrode side electrical path and a negative electrode side electrical path and includes a plurality of switching elements;
• a rotary electric machine that includes a plurality of windings connected to each other at a neutral point and that inputs and outputs power from and to the power supply unit via the inverter;
• a connection path that electrically connects an intermediate point between the storage batteries of the power supply unit to the neutral point of the windings;
• a low-voltage storage battery;
• and
• a DCDC converter that (i) includes a first terminal and a second terminal that receive power supply from the power supply unit, (ii) converts a terminal voltage of the power supply unit, and (iii) supplies the converted voltage to the low-voltage storage battery, wherein
• the first terminal of the DCDC converter is connected to the connection path, and the second terminal of the DCDC converter is connected to at least one of the positive electrode side electrical path and the negative electrode side electrical path.