FUEL CELL SYSTEM

摘要

A fuel cell system (100) includes a fuel cell (40), a multiphase voltage conversion device (60) with N-phases (N being an integer equal to or larger than two) that is connected to the fuel cell, a control signal generation portion (130) that generates control signals to control each phase of the multiphase voltage conversion device by superimposing a control waveform for measuring impedance on a voltage indicating an output target voltage of the multiphase voltage conversion device and sequentially outputs the control signals corresponding to N phases with a predetermined phase difference to the multiphase voltage conversion device, and an impedance calculation portion (140) that measures a current and a voltage of the fuel cell on cycles corresponding to N predetermined sampling frequencies having a phase difference equal to the predetermined phase difference and calculates an impedance of the fuel cell based on the measured current and the measured voltage.