Patent ID: 8952702
Filing Date: 2015-02-10
Classification: G01R,H01M,Y02E,Y02T

Abstract:
1. A fuel cell system comprising: a fuel cell; a multiphase voltage conversion device 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 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 that measures a current of the fuel cell 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.