Control device for fuel cell system and control method therefor

A control device for a fuel cell system, comprising:

• a fuel cell configured to generate electric power by using reactant gases supplied thereto;
• a three-parallel step-up converter configured to step up a power generation voltage generated by the fuel cell, the three-parallel step-up converter including three step-up converters electrically connected in parallel;
• a load to which electric power is supplied from the three-parallel step-up converter;
• a control unit configured to control the load and operation of the three-parallel step-up converter;
• and
• one or more processors configured to execute computer-executable instructions stored in a memory,
• wherein the three step-up converters of the three-parallel step-up converter are integrally arranged in parallel on a substrate, between positive and negative input terminals and positive and negative output terminals, and
• the one or more processors execute the computer-executable instructions to cause the control device for the fuel cell system to:
• in accordance with a required power for the load, preferentially operate a step-up converter of a center phase among the three step-up converters, over step-up converters of both side phases among the three step-up converters, the step-up converter of the center phase being centrally disposed among the three step-up converters, the step-up converters of both the side phases being disposed on both sides of the step-up converter of the center phase.