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95results about How to "Good control" patented technology

Programmable domestic water heating system

InactiveUS6936798B2Good controlReliable indicationCooking vesselsCentral heating component positioningUse of timeTemperature sense
The invention relates to a method for heating water in a domestic water heating system that comprises the steps of: (a) providing a water tank containing mw liters of water; (b) providing at least one temperature sensing unit in said water tank for sensing the temperature of the water in the tank: (c) providing a heating element in said water tank; (d) providing a control unit for activating said heating element, said control unit continuously receiving indication for the water temperature from said temperature sensing unit; (e) providing to said control unit a desired water temperature, and designating a time for using the water at said desired temperature; (f) knowing the current water temperature, the desired water temperature at said designated time, the power of the heating element, and the specific heat of the water, calculating by the control unit the heating period Δt needed for heating the water in the tank from the current temperature as measured by said temperature sensing unit, to the desired temperature; (g) periodically repeating said calculation and updating said calculated period Δt according to changes in the sensed water temperature; and (h) when the designated usage time is approaching, activating the heating element a Δt period before the said designated period.
Owner:JOSEPH TIRAN

Low-loss optical fiber and manufacturing method thereof

ActiveCN103472529AReduce interface stressGood controlGlass making apparatusOptical fibre with multilayer core/claddingAttenuation coefficientWave band
The invention discloses a low-loss optical fiber and a manufacturing method of the low-loss optical fiber, and relates to the field of optical fibers. The low-loss optical fiber comprises a step change waveguide; the step change waveguide comprises a core layer, a core cladding transition layer, a core cladding interface transition layer, a deep fluorine-doped cladding, a cladding sleeve transition layer, a cladding sleeve interface transition layer and a sleeve layer, wherein the core layer, the core cladding transition layer, the core cladding interface transition layer, the deep fluorine-doped cladding, the cladding sleeve transition layer, the cladding sleeve interface transition layer and the sleeve layer are arranged in sequence from inside to outside; the core layer is made of a pure silicon core slightly doped with fluorine or boron, wherein the relative refringence between the core layer and the pure silicon core is 0-0.1%; the deep fluorine-doped cladding is made of pure silicon dioxide deeply doped with fluorine, wherein the relative refringence between the deep fluorine-doped cladding and the core layer is 0.24%-0.28%; the refractivity in the core cladding transition layer is distributed in a gradient change mode according to a parabola curve, wherein the range of the absolute value of stress coefficients is from 0.005 to 0.015; the base point temperature rises gradually from 900-950 DEG C to 1150-1200 DEG C. The attenuation coefficient of the low-loss optical fiber manufactured according to the manufacturing method can be reduced to less than 0.158 dB/km in a 1550 nm wave band.
Owner:FENGHUO COMM SCI & TECH CO LTD +1

Sampling circuit, switching power supply control circuit, switching power supply and sampling method

The invention provides a sampling circuit, a switching power supply control circuit, a switching power supply and a sampling method. The sampling circuit comprises a demagnetization time acquisition circuit which is used for acquiring transformer demagnetization time TDS of the switching power supply in one switching period and transmitting the demagnetization time to a sampling control circuit; the sampling control circuit which is used for outputting predetermined clock pulse CLK according to the demagnetization time TDS so as to control sampling time of a sampling holding circuit, wherein pulse width W1 of the predetermined clock pulse CLK is less than the demagnetization time TDS; and the sampling holding circuit which is used for acquiring instant feedback voltage VF of the switching power supply at a predetermined time point under the control of the clock pulse CLK and holding feedback voltage VF so as to output an analog single with amplitude of VF, wherein the predetermined time point is the instant at which the switching power supply starts to work continuously for a time period of W1 in a switching period after one switching period. Feedback voltage in the switching power supply can be accurately acquired and constant voltage control precision of the switching power supply can be enhanced.
Owner:BYD SEMICON CO LTD

Construction method for supporting template at construction joint of frame structure

The invention relates to a construction method for supporting templates in the building field, particularly relating to a construction method for supporting the templates at construction joints of a frame structure. The construction method comprises the following steps: top die sticks are arranged on components at two sides of the construction joints; a back arris is made of battens; the back arris is arranged in a through-length manner along a longitudinal direction of the component; the templates at the construction joints are supported at two sides of the back arris and arranged in the construction joints; the back arris and the templates arranged at the two sides of the back arris are connected with connecting pieces and are connected into a whole through the connecting pieces; then holes are drilled at specific positions of the templates at the construction joints; and split bolts are penetrated into the drilling holes to oppositely pull the templates in the construction joints and the templates at outer sides of the components, and additionally, the top die stick is supported in the components so that the templates are effectively fixed; concretes of the components at the two sides of the construction joints are poured at intervals; and at last, the back arris and the templates are dismantled. By using the method, section sizes of the concretes after pouring moulding on the two side structures of the construction joints, protective layer thicknesses of the components and pouring quality of the component concretes can be effectively ensured, thereby facilitating construction and operation.
Owner:CHINA 22MCC GROUP CORP +1

High-voltage inverter adaptive control system based on neural network and construction method thereof

InactiveCN103107710AGood controlEnsure control accuracy and stabilityAC motor controlAc-ac conversionLinear systemFrequency ratio
The invention discloses a high-voltage inverter adaptive control system based on a neural network. The high-voltage inverter adaptive control system based on the neural network comprises a power source module, a frequency conversion module, a motor, a detection module and a control module. The frequency conversion module is connected between the power source module and the motor. The control module comprises an operation display circuit, a main control circuit and a base drive circuit. The operation display circuit is connected with the main control circuit for operation of a user. The main control circuit is connected with the frequency conversion module and the motor through the detection module to detect feedback signals of the frequency conversion module and the motor. The main control circuit comprises a proportion integration differentiation (PID) controller and the neural network. Output of the PID controller is adjusted according to the feedback signal by the neural network so that intelligent constant voltage frequency ratio control or electric current control performed to the frequency conversion module is achieved. According to intelligent characteristics of self-learning, self-adaptation and the like of the neural network, good control of a complex nonlinear system is realized so that stability and control accuracy of the control system are guaranteed. Meanwhile, the invention further discloses a construction method of the high-voltage inverter adaptive control system based on the neural network.
Owner:SHENZHEN AMBITION ELECTRONICS

Device for removing heavy metals and polycyclic aromatic hydrocarbons in bottom sediment of river channels and method thereof

The invention relates to a device for removing heavy metals and polycyclic aromatic hydrocarbons in bottom sediment of river channels and a method thereof and belongs to the field of river-channel pollution treatment in environmental protection. The device comprises an electrolysis device, a biological fuel cell and a galvanometer, wherein the electrolysis device comprises a cathode area, a bottom-sediment area and an anode area; the negative electrode of the biological fuel cell is arranged at the outer side of a round drum, the positive electrode of the biological fuel cell is arranged at the inner side of the round drum, and a compost layer is arranged between the negative electrode and the positive electrode; a cathode rod is arranged in the cathode area, the top part of the cathode rod is electrically connected with the positive electrode, the negative electrode is connected with one end of the galvanometer, and the other end of the galvanometer is electrically connected with a positive rod; a substance exchange film is arranged between the anode area and the bottom-sediment area, a substance exchange film is also arranged between the bottom-sediment area and the cathode area, the top part of a cathode sampling area is provided with a cathode sampling port, the top part of a middle sampling area is provided with a middle sampling port, and the top part of an anode sampling area is provided with an anode sampling port. The device and the method have the advantages that the energy is saved and simultaneously the purpose of using wastes to treat wastes is achieved.
Owner:NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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