Importance

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Abstract

A controller of a fuel cell system performs a starting operation that switches on a first precharge circuit so as to reduce a voltage difference between a first smoothing capacitor and a second smoothing capacitor and subsequently turns on a first relay, when a start switch is turned on in a system off state that the first relay is off. Upon satisfaction of a predetermined condition including at least one of a condition that a difference between the voltage of the first smoothing capacitor and the voltage of the second smoothing capacitor is equal to or greater than a first reference value and a condition that the voltage of the first smoothing capacitor is equal to or higher than a second reference value, the controller uses a second converter to charge the second smoothing capacitor so as to bring the voltage of the second smoothing capacitor closer to the voltage of the first smoothing capacitor, and subsequently switches the first precharge circuit from off to on. This configuration reduces the electric current flowing through a precharge circuit at the time of starting the fuel cell system.

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First Claim