Patent ID: 8097373
Filing Date: 2012-01-17
Classification: H01M,H02J,Y02E,Y02T

Abstract:
1. A fuel cell power supply device comprising: a fuel cell; an accumulating means; a first step-up and step-down means comprising an input section connected to the fuel cell and an output section connected to a load, the first step-up and step-down means steps up or steps down voltage inputted to the input section and supplies electric power generated by the stepped-up or stepped-down voltage to the load; a second step-up and step-down means comprising an input section connected to the first step-up and step-down means and an output section connected to the accumulating means, the second step-up and step-down means steps up or steps down voltage inputted to the input section and supplies electric power generated by the stepped-up or stepped-down voltage to the load; and a power-supply controlling means for controlling operation of the first and second step-up and step-down means according to electric power requested by the load and controlling power supply from the fuel cell to the load and power supply from the accumulating means to the load, wherein the fuel cell power supply device includes an output judging means for judging whether an output of the fuel cell is equal to or higher than a predetermined level, and the power-supply controlling means limits, when it is not judged by the output judging means that the output of the fuel cell is equal to or higher than the predetermined level, an output of the accumulating means to be equal to or smaller than a first output limit value for allowing continuous output in first output time and limits, when it is judged by the output judging means that the output of the fuel cell is equal to or higher than the predetermined level, within second output time shorter than the first output time, the output of the accumulating means to be equal to or smaller than a second output limit value, which is larger than the first output limit value, for allowing continuous output in the second output time.