Abstract: The present invention generally relates to a system and method to enhance functionality of an executable application in a computer system in which application program interfaces associated with one or more executable applications are hooked to modified application program interfaces to provide increased functionality.

Abstract: The present invention generally relates to a system and method to enhance functionality of an executable application in a computer system in which application program interfaces associated with one or more executable applications are hooked to modified application program interfaces to provide increased functionality.

Abstract: A regulated DC power supply facilitates extended and uninterrupted power to a load by using a secondary power source such as a regenerative fuel cell that has its DC power output conditioned by a power converter. The DC power supply includes a rectifier that converts AC power from an AC power source to DC power for a load coupled to a DC bus. A fuel cell arrangement is electrically coupled to a power converter that is coupled in turn to the DC bus, the converter conditions an unconditioned DC power output of the fuel cell to the load. A system controller is communicatively coupled to the rectifier, the converter and to a fuel cell controller, the fuel cell controller initiating DC power output from the fuel cell arrangement upon detecting the AC power outage (or disengaging the fuel cell upon resumption of AC power).

Abstract: A self-controlling fuel cell power system comprises a fuel cell subsystem having a plurality of possible operating states and a controller which transitions the subsystem among the states. A related method comprises sensing one or more subsystem parameters, and, responsive thereto, transitioning the subsystem among the operating states.

Abstract: A system comprising a plurality of power sources coupled in parallel is described. The sources are each coupled to a first bus and to a second bus. A sensing element corresponding to each power source is coupled to a third bus, and allows sensing of power demanded by a load from the source. Each source is configured to sense the power demanded from it by the load, and, in response thereto, supply power to the load. In one embodiment, a sensing element comprises a resistor having a resistance inversely proportional to the power capacity of its corresponding source. In the event of a power failure of a power source, an interlock responsive to the failure condition interrupts current flow through the sensing element corresponding to the failed source, and optionally disconnects the power source from the load.

Abstract: A regulated DC power supply facilitates extended and uninterrupted power to a load by using a secondary power source such as a regenerative fuel cell that has its DC power output conditioned by a power converter. The DC power supply includes a rectifier that converts AC power from an AC power source to DC power for a load coupled to a DC bus. A fuel cell arrangement is electrically coupled to a power converter that is coupled in turn to the DC bus, the converter conditions an unconditioned DC power output of the fuel cell to the load. A system controller is communicatively coupled to the rectifier, the converter and to a fuel cell controller, the fuel cell controller initiating DC power output from the fuel cell arrangement upon detecting the AC power outage (or disengaging the fuel cell upon resumption of AC power).

Abstract: The present invention can be embodied in a power source having internal redundancy for allowing continued operation of a load such as an electric vehicle, as well as related methods. The power source comprises a first plurality of fuel cell stacks, a second plurality of fuel cells, and a third plurality of bypass devices. Each power converter can receive input electrical power from one of the fuel cell stacks and generates output electrical power at a predetermined output voltage. The power converters can be connected in series between terminals of the power source. Each bypass device can be coupled to one of the power converters for providing a current path if the power converter is unable to provide output electrical power. Each power converter can have selectable output voltages for increasing its output voltage if one of the power converters is not supplying power for the power source.