Abstract:
A managing method of the start-up phase of at least one micro fuel cell (11) to be connected to a load (12) is described as comprising the steps of: - measuring a micro fuel cell voltage value (V FC ) across the micro fuel cell (11) activated by means of a fuel injection; - comparing the micro fuel cell voltage value (V FC ) with a first predetermined threshold voltage value (V TH ); and - establishing an operation mode of the micro fuel cell (11) according to the following conditions: - as long as the micro fuel cell voltage value (V FC ) is lower than the first threshold voltage value (V TH ), the micro fuel cell (11) operates in a first open circuit state (S1), during which it is not connected to the load (12); - when the micro fuel cell voltage value (V FC ) overcomes the first threshold voltage value (V TH ), the micro fuel cell (11) passes to a second pre-ignition state (S2), during which it supplies a current value (I FC ) corresponding to the first threshold voltage value (V TH ), according to a static voltage-current or V-I characteristic of the micro fuel cell (11). A managing circuit (10) of the start-up phase of at least one micro fuel cell (11) to be connected to a load (12) is also described.
Abstract:
A circuit implementing a non-integer order dynamic system includes a neural network (1 to 5) adapted to receive at least one input signal (IS) and to generate therefrom at least one output signal (OS). The input and output signals (IS, OS) are related to each by a non-integer order integro-differential relationship through the coefficients of the neural network (1 to 5). A plurality (I, II) of such circuits, implementing respective non-integer order (PI λ D µ ) controllers can be interconnected in an arrangement wherein any of the integral (200) or differential (202) blocks included in one of those circuits generates a signal which is fed to any of the integral (200) or differential (204) blocks of another circuit in the system.
Abstract:
A flow connector for a microfluidic system through which a solution of at least an oxidable compound is fed to a feed manifold (3) of an energy converting electrochemical device (FC) having a flat coupling area with the flow connector is made as a distinct article of manufacture applicable onto the electrochemical device. The flow connector comprises a monocrystalline silicon platform (1) having at least two distinct channels (5, 6) defined on the bottom side of the platform, on the top side of which a plurality of functional modules (P, C1, C2, C3, V1, V2, V3) of said microfluidic system are fixed in correspondence of respective through holes (7, 8, 9, 10, 11) communicating with a respective channel (5, 6); a first channel (5) connecting two or more of said through holes (7, 8, 9); the second channel (6) connecting two or more other through holes (10, 11); through holes first (9) and second (10), respectively connected to said channels first (5) and second (6), coinciding with a suction port and with a delivery port, respectively, of a micropump module (P) fixed onto the silicon platform (1); at least the through hole (9) coinciding with the suction port of the micropump (P) being connected through said first channel (5) to a through hole (7) coinciding with the outlet port of a first solvent release microvalve module (V1) from a first supply cartridge (C1) and to a through hole (8) coinciding with the outlet port of a second oxidable compound release microvalve module (V2) from a second supply cartridge (C2); upon coupling the channelled (5, 6) bottom side of said silicon platform (1) to said flat coupling area of the device (FC), an inlet of said solution feed manifold (3) coinciding with said second channel (6). The depleted solution discharge manifold (4) of the device (FC) has an outlet connecting to the first channel (5) of the silicon flow connector (1) and through a fifth through hole (11) coinciding with the inlet of a third solution discharge microvalve module (V3), to a third cartridge (C3) into which bleeding depleted waste solution.