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17284 results about "Fuel cells" patented technology

Mehotd for determining a maximum power point voltage of a fuel cell, as well as fuel cell control system and power controller used in the fuel cell control system

A detection voltage, which is obtained by dividing the voltage of a fuel cell 1 by resistors, is compared with a first reference voltage Vref1 by a differential amplifier. The differential voltage is input to a control section. The control section performs PWM control for the circuit section according to the difference. The first reference voltage Vref1 is set according to the dividing ratio of the resistors, based on the output voltage when the fuel cell generates power at the maximum power point. To determine the output voltage for maximum power generation, a characteristic curve representing a current-voltage characteristic is approximated by an approximating line within a range excluding an area in which the output voltage changes abruptly when the output current is nearly zero, and an extrapolated voltage is obtained on the extension line of the approximating line at an output current of zero. Fifty percent of the extrapolated voltage is then determined as the output voltage when the fuel cell generates power at the maximum power point. Thus, a fuel cell control system that identifies a highly precise output voltage for power generation at a maximum power point and controls power so that the maximum power point is not exceeded could be provided.

Methods of using fuel cell system configured to provide power to one or more loads

A fuel cell system is described for providing primary and/or auxiliary/backup power to one or more loads selected from the group comprising: lawn & garden equipment; radios; telephone; targeting equipment; battery rechargers; laptops; communications devices; sensors; night vision equipment; camping equipment; stoves; lanterns; lights; vehicles; cars; recreational vehicles; trucks; boats; ferries; motorcycles; motorized scooters; forklifts; golf carts; lawnmowers; industrial carts; passenger carts (airport); luggage handling equipment (airports); airplanes; lighter than air crafts; blimps; dirigibles; hovercrafts; trains; locomotives; submarines (manned and unmanned); torpedoes; security systems; electrical energy storage devices for solar-based, tidal-based, hydro-based, wind-based, and other renewable energy source; equipment for which a primary and/or backup power source is necessary or desirable to enable the equipment to function for its intended purpose, military-usable variants of above, and suitable combinations of any two or more thereof. The system provides power to the one or more loads upon the occurrence of a power outage condition, which includes a disruption or discontinuation in the delivery of primary power (i.e., power from a system-external primary source, namely, a source other than the fuel cell system) to, or power demand condition by, the one or more loads. A controller senses outage of primary power to, or demand for primary power by, the one or more loads, and, responsive thereto, operatively engages one or more fuel cells to provide power to the one or more loads.
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