Voltage converter

A voltage converter comprising:

• a direct current power source that is composed of a plurality of secondary batteries;
• a first load that is driven by a first direct current voltage of the direct current power source;
• a voltage conversion unit that converts the first direct current voltage into a second direct current voltage smaller than the first direct current voltage;
• a second load that is coupled to each of the secondary batteries via the voltage conversion unit and is driven by the second direct current voltage;
• and
• a controller that watches a state of each of the secondary batteries and controls the voltage conversion unit, wherein
• the voltage conversion unit includes a plurality of switches each of which is disposed between a positive electrode or a negative electrode of one of the secondary batteries and the second load,
• each of the switches is capable of switching a state between the secondary battery and the second load between a conduction state and a non-conduction state, and
• the controller switches the switches on the basis of the state of each secondary battery so as to apply the second direct current voltage to the second load.