Fuel cell system
First Claim
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.
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Accused Products
Abstract
A fuel cell system includes 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 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.
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Citations
5 Claims
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1. A fuel cell system comprising:
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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. - View Dependent Claims (2, 3, 5)
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4. A method of measuring an impedance of a fuel cell system that includes a fuel cell and 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, the method comprising:
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generating 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; sequentially outputting signals corresponding to N phases with a predetermined phase difference to the multiphase voltage conversion device; and measuring 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 calculating an impedance of the fuel cell based on the measured current and the measured voltage.
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Specification