POWER SUPPLY SYSTEM

A power supply includes: a wiring to which direct current (DC) electric power is supplied from an external power supply; a first DC/DC converter that converts a voltage value of the DC electric power supplied to the wiring into another voltage value to output the DC electric power to a load group; a first filter unit having a first cutoff frequency; a second DC/DC converter that converts the voltage value of the DC electric power supplied to the wiring into another voltage value to output the DC electric power to the load group; a second filter unit having a second cutoff frequency higher than the first cutoff frequency; and a controller that controls the first DC/DC converter when DC electric power is supplied from the external power supply to the wiring and when DC electric power needs to be supplied to the load group.