Abstract:
A maximum-power-point tracking device is provided for a solar electric-generation system that includes a solar battery and a DC/DC converter connected to the solar battery. The device includes a sampling module configured to detect output current and voltage values of the solar battery. A controlling module is configured to calculate a target current value according to the output current and voltage values and a preset current value, and output a controlling signal for controlling the value of a current according to the output current of the solar battery and the target current value. The device also includes a driving module configured to receive the controlling signal from the controlling module and output a driving signal to adjust a output current value of the DC/DC converter to close to the target current value and adjust an output power of the DC/DC converter.
Abstract:
A fuel cell system and a control method thereof; said system comprises a fuel cell generator (5), a fuel supply unit (6), a gas supply unit (7), a detection unit (8), and a control unit (9); said detection unit (8) is for detecting the discharge parameter of said fuel cell generator (5); said control unit (9) is for controlling fuel supply from said fuel supply unit (6) and gas supply from said gas supply unit (7) in accordance with the discharge parameter detected by said detection unit (8); wherein, said detection unit (8) is a current detection device, and the discharge parameter of said fuel cell generator (5) detected by said detection unit (8) is the discharge current value. The present invention utilizes the discharge current output from the fuel cell generator as the main parameter to control the fuel/gas supply units; therefore, the control is more direct and effective. In addition, the present invention can also control the working duration of said fuel and gas supply units to operate intermittently in accordance with the said discharge current value.
Abstract:
Disclosed are a method and a device (100) for preparing a compound semiconductor film. The method may comprises the steps of: providing a substrate (106) above at least an evaporation source (104) in a vacuum condition; heating source material contained in the evaporation source (104) so that the source material is vapor deposited on the substrate (106); and taking out the substrate (106) under protection of inert gas. The substrate (106) may be rotated around an axis that is normal to a plane where the evaporation source (104) is positioned, and the substrate (106) is tilted by a predetermined angle with respect to the plane.
Abstract:
Disclosed is a flow-field plate and fuel cell stack using the same. The flow-field plate (19) of the present invention comprises a center hole (5) formed at the center of flow-field plate, a inlet (6) and a outlet (7) formed on two positions near the outer edge of flow-field plate, and flow grooves distributing around the center hole (5) and communicating with the inlet (6) and outlet (7) on one side of flow-field plate. Since the flow-field plate according to the present invention comprises flow grooves distributing around the center hole and communicating with the inlet and outlet, which is benefit for oxidant diffusion, there is no "dead-end" on the flow-field plate and reactants may distribute uniformly to each part of flow-field plate. Furthermore, resultants generated from reaction, such as water, nitrogen, carbon dioxide, etc., may be discharged in time and not accumulate on flow-field plate. Therefore, the reactant utilization ratio, the fuel cell performances and its service life may be improved.
Abstract:
Disclosed is a flow-field plate and fuel cell stack using the same. The flow-field plate (19) of the present invention comprises a center hole (5) formed at the center of flow-field plate, a inlet (6) and a outlet (7) formed on two positions near the outer edge of flow-field plate, and flow grooves distributing around the center hole (5) and communicating with the inlet (6) and outlet (7) on one side of flow-field plate. Since the flow-field plate according to the present invention comprises flow grooves distributing around the center hole and communicating with the inlet and outlet, which is benefit for oxidant diffusion, there is no "dead-end" on the flow-field plate and reactants may distribute uniformly to each part of flow-field plate. Furthermore, resultants generated from reaction, such as water, nitrogen, carbon dioxide, etc., may be discharged in time and not accumulate on flow-field plate. Therefore, the reactant utilization ratio, the fuel cell performances and its service life may be improved.
Abstract:
A fuel cell system and a control method thereof; said system comprises a fuel cell generator (5), a fuel supply unit (6), a gas supply unit (7), a detection unit (8), and a control unit (9); said detection unit (8) is for detecting the discharge parameter of said fuel cell generator (5); said control unit (9) is for controlling fuel supply from said fuel supply unit (6) and gas supply from said gas supply unit (7) in accordance with the discharge parameter detected by said detection unit (8); wherein, said detection unit (8) is a current detection device, and the discharge parameter of said fuel cell generator (5) detected by said detection unit (8) is the discharge current value. The present invention utilizes the discharge current output from the fuel cell generator as the main parameter to control the fuel/gas supply units; therefore, the control is more direct and effective. In addition, the present invention can also control the working duration of said fuel and gas supply units to operate intermittently in accordance with the said discharge current value.
Abstract:
A fuel cell battery, comprising a chamber unit (1), an anode entrance (2) connected to the chamber unit (1), an anode exit (3), a cathode entrance (4) and a cathode exit (5). The anode entrance (2) is connected to a hydrogen source (11) and an organic fuel source (12) respectively through a hydrogen duct (9) and an organic fuel duct (10). Duct (9) and duct (10) are respectively installed with a hydrogen valve (13) and an organic fuel valve (14). An exit valve (20) is installed at the anode exit. This fuel cell battery combines the advantages provided by hydrogen fuel and organic fuel. The fuel cell battery can meet the dual requirements of operating on both high and low power. The fuel cell battery's design leads to low manufacturing costs, a simple structure, and easy implementation.
Abstract:
A method for preparing a CdS film comprises preparing a source material coating layer from slurry by adding the source material and CdCl 2 into dispersant; performing closed space sublimation under a predetermined pressure in a protection atmosphere to deposit a film on a substrate which is placed over the coating layer; and annealing the substrate after the deposition under a predetermined temperature. Thus the method is easy for annealing without an additional annealing device with simple operability.
Abstract:
Disclosed is a flow-field plate and fuel cell stack using the same. The flow-field plate (19) of the present invention comprises a center hole (5) formed at the center of flow-field plate, a inlet (6) and a outlet (7) formed on two positions near the outer edge of flow-field plate, and flow grooves distributing around the center hole (5) and communicating with the inlet (6) and outlet (7) on one side of flow-field plate. Since the flow-field plate according to the present invention comprises flow grooves distributing around the center hole and communicating with the inlet and outlet, which is benefit for oxidant diffusion, there is no "dead-end" on the flow-field plate and reactants may distribute uniformly to each part of flow-field plate. Furthermore, resultants generated from reaction, such as water, nitrogen, carbon dioxide, etc., may be discharged in time and not accumulate on flow-field plate. Therefore, the reactant utilization ratio, the fuel cell performances and its service life may be improved.
Abstract:
Disclosed is a flow-field plate and fuel cell stack using the same. The flow-field plate (19) of the present invention comprises a center hole (5) formed at the center of flow-field plate, a inlet (6) and a outlet (7) formed on two positions near the outer edge of flow-field plate, and flow grooves distributing around the center hole (5) and communicating with the inlet (6) and outlet (7) on one side of flow-field plate. Since the flow-field plate according to the present invention comprises flow grooves distributing around the center hole and communicating with the inlet and outlet, which is benefit for oxidant diffusion, there is no "dead-end" on the flow-field plate and reactants may distribute uniformly to each part of flow-field plate. Furthermore, resultants generated from reaction, such as water, nitrogen, carbon dioxide, etc., may be discharged in time and not accumulate on flow-field plate. Therefore, the reactant utilization ratio, the fuel cell performances and its service life may be improved.