Patent ID: 7754362

Claim:
A fuel cell system having an electricity generator for generating electric energy through electro-chemical reaction between hydrogen and oxygen, the fuel cell system comprising: a first comparator having a positive input port and a negative input port, wherein the positive input port is connected to an output port of the electricity generator for providing the generated electric energy; a reference supply circuitry for providing a reference electricity output value corresponding to a load; a first transistor switch having a control input connected to an output of the first comparator, the first transistor switch for providing the generated electric energy to the load based on the output of the first comparator; a second comparator having a positive input port and a negative input port, wherein the positive input port of the second comparator is connected to the reference supply circuitry and the negative input port of the second comparator is connected to the output port of the electricity generator; an auxiliary power supply unit for providing an output connectable to the load; and a second transistor switch having a control input connected to an output of the second comparator, the second transistor switch for providing the output of the auxiliary power supply unit to the load based on the output of the second comparator, wherein the negative input port of the first comparator is connected to the reference supply circuitry, and wherein the first comparator is configured to compare an electricity output value of the electric energy generated by the electricity generator with the reference electricity output value corresponding to the load.