Abstract: Electric power is produced in a fuel cell array based on chemical fuel provided from a fuel source. The electric power is held available via an output terminal. A sensor cell registers a sensor signal reflecting a degree of consumption of chemical fuel in the fuel cell array relative to an amount of chemical fuel received in the fuel cell array. The production of electric power in the fuel cell array is monitored by measuring at least one voltage in the fuel cell array. A fraction of the electric power produced by the fuel cell array is controlled to be fed into a dynamic electric load connected to the output terminal. The fraction fed into the dynamic electric load is controlled in response to the sensor signal such that a difference is minimized between the amount of chemical fuel received in the fuel cell array and an amount of chemical fuel consumed in the fuel cell array when producing the electric power.

Abstract: The invention relates to a fuel generator (12) for a fuel cell based charger system, and a system containing a charger (10) and a fuel generator. The generator comprises a compartment (20?) containing aluminium, means (18?, 20?, 21, FW) for providing a solution of water and a water soluble compound capable of reacting with aluminium to generate hydrogen gas, when dissolved in water and brought into contact with the aluminium, and means (FS) for passing said solution into the compartment containing aluminium. The invention also provides a method of operating the system. It comprises providing a fuel generator and a hydrogen driven fuel cell based charger device having means for accommodating the generator. The generator and charger having a common interface cooperative for providing fluid communication between the generator and the charger. The system is primed by inserting the generator into the charger whereby the interface opens up fluid communication between selected parts of the system.

Abstract: The invention relates to a fuel cartridge (200) and comprises a reactor compartment (204) housing a reactive material in which an aqueous solution having a pH in the range 12.5 to 14 can be introduced to react with the reactive material to generate hydrogen gas. There is an inlet to said reactor compartment (204) for said aqueous solution and an outlet (216) for hydrogen gas. A porous and hydrophilic film (220) is provided in the reactor compartment at said inlet and having an extension over at least a part of the inner space of the reactor compartment. The film is adapted to convey said aqueous solution by capillary force to distribute the solution over the inside of said reactor chamber. The film is suitably provided against an inner wall of the reactor compartment and covers at least 50% of the inner wall, preferably the entire inner wall.

Abstract: The invention relates to a novel fuel cartridge for providing hydrogen gas on the basis a reactant system. Thus, a fuel cartridge for a fuel cell device, comprises a reactor compartment for storing a first reactant, a water compartment for storing water. It has a mixing compartment (106) containing a water soluble second reactant, and a fluid communication means (114) between the mixing compartment (106) and the reactor compartment (102) adapted to pass second reactant dissolved in water to the reactor compartment (102), in which the dissolved second reactant can react with the first reactant to generate a gas. Suitably, the fuel cartridge comprises an interface connectable to a water control mechanism disposed outside the cartridge, the water control mechanism configured to control a flow of the water between the water compartment and the mixing compartment such that the water mixes with and dissolves the second reactant in the mixing compartment.

Abstract: The invention relates to a fuel generator (12) for a fuel cell based charger system, and a system containing a charger (10) and a fuel generator. The generator comprises a compartment (20?) containing aluminium, means (18?, 20?, 21, FW) for providing a solution of water and a water soluble compound capable of reacting with aluminium to generate hydrogen gas, when dissolved in water and brought into contact with the aluminium, and means (FS) for passing said solution into the compartment containing aluminium. The invention also provides a method of operating the system. It comprises providing a fuel generator and a hydrogen driven fuel cell based charger device having means for accommodating the generator. The generator and charger having a common interface cooperative for providing fluid communication between the generator and the charger. The system is primed by inserting the generator into the charger whereby the interface opens up fluid communication between selected parts of the system.

Abstract: An arrangement for use in a light beam projection device for adjusting an orientation of a projected light beam is disclosed. The arrangement comprises a base frame, a support platform adapted to set the orientation of the projected light beam, and a pivot member pivotally mounting the support platform relative to the base frame. A tilting motor is provided to the base frame and has a pair of output shafts influencing the orientation of the support platform, whereby rotation of the output shafts in a first direction tilts the support platform only along a first axis, and rotation of the output shafts in a second direction tilts the support platform only along a second axis. A power supply is provided for driving the tilting motor.

Abstract: A rotor shaft is supported in a housing of a rotor assembly for a laser level. Bearings support the rotor shaft for rotation relative to the housing. An adhesive fixes an outer race of at least one of the bearings in position between the rotor shaft and the housing. The adhesive is a low viscosity, quick setting anaerobic adhesive, which when cured prevents angular drift of the shaft relative to the housing by eliminating the clearance that would have existed between the outer race and the housing.

Abstract: An arrangement for use in a light beam projection device for adjusting an orientation of a projected light beam is disclosed. The arrangement comprises a base frame, a support platform adapted to set the orientation of the projected light beam, and a pivot member pivotally mounting the support platform relative to the base frame. A tilting motor is provided to the base frame and has a pair of output shafts influencing the orientation of the support platform, whereby rotation of the output shafts in a first direction tilts the support platform only along a first axis, and rotation of the output shafts in a second direction tilts the support platform only along a second axis. A power supply is provided for driving the tilting motor.