FUEL CELL SYSTEM AND METHOD FOR CONTROLLING OPERATION OF THE FUEL CELL SYSTEM
First Claim
1. A method for controlling operation of a fuel cell system to transfer power discharged from a secondary cell and power produced by operating a fuel cell stack to a load, the method comprising:
- supplying the power produced by operating the fuel cell stack in a maximum output mode to the load while concurrently charging the secondary cell with the produced power when an amount of charge of the secondary cell is smaller than a first standard value;
supplying both the power produced by operating the fuel cell stack in a stable output mode and the power discharged by the secondary cell to the load when the amount of charge of the secondary cell is larger than a second standard value; and
maintaining an existing output mode among the output modes when the amount of charge of the secondary cell is larger than the first standard value and smaller than the second standard value.
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Accused Products
Abstract
Fuel cell systems and methods for controlling fuel cell systems. In one embodiment, the method includes supplying power produced by operating the fuel cell stack in a maximum output mode to the load while concurrently charging the secondary cell with the produced power when an amount of charge of the secondary cell is smaller than a first standard value, supplying both power produced by operating the fuel cell stack in a stable output mode and the power discharged by the secondary cell to the load when the amount of charge of the secondary cell is larger than a second standard value, and maintaining an existing output mode among the output modes when the amount of charge of the secondary cell is larger than the first standard value and smaller than the second standard value.
14 Citations
18 Claims
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1. A method for controlling operation of a fuel cell system to transfer power discharged from a secondary cell and power produced by operating a fuel cell stack to a load, the method comprising:
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supplying the power produced by operating the fuel cell stack in a maximum output mode to the load while concurrently charging the secondary cell with the produced power when an amount of charge of the secondary cell is smaller than a first standard value; supplying both the power produced by operating the fuel cell stack in a stable output mode and the power discharged by the secondary cell to the load when the amount of charge of the secondary cell is larger than a second standard value; and maintaining an existing output mode among the output modes when the amount of charge of the secondary cell is larger than the first standard value and smaller than the second standard value. - View Dependent Claims (2, 3)
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4. A fuel cell system comprising:
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a fuel cell stack for producing power using an electrochemical reaction between fuel and an oxidizer; a secondary cell for storing and discharging power; a stack voltage converting circuit for converting a voltage produced by the fuel cell stack and for transferring the converted voltage to a load node, where an output terminal of the secondary cell and a load are connected to the load node; and a voltage converting controller for controlling a conversion ratio of the stack voltage converting circuit so that a voltage on an output line of the stack voltage converting circuit and a voltage on an output line of the secondary cell are the same at the load node. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A fuel cell system comprising:
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a fuel cell stack for producing power by an electrochemical reaction between fuel and an oxidizer; a secondary cell for storing and discharging power; a secondary cell voltage converting circuit for converting a voltage discharged from the secondary cell and for transferring the converted voltage to a load node where an output terminal of the fuel cell stack and a load are connected to the load node; and a voltage converting controller for controlling a conversion ratio of the secondary cell voltage converting circuit so that a voltage on an output line of the second cell voltage converting circuit and a voltage on an output line of the fuel cell stack are the same at the load node. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification