37results about How to "Avoid current fluctuations" patented technology

The invention is suitable for the technical field of display screen driving, and provides an LED display driving control method and device, and the control method comprises the steps: determining a driving mode of each LED in an LED array based on the brightness data of a current frame, and obtaining first driving data and second driving data; inputting the first driving data into the LED array to drive the LED array for the first time; and inputting the second driving data into the LED array to drive the LED array for the second time, wherein the first driving mode and the second driving mode each correspond to one of a PAM driving mode and a PWM driving mode. According to the technical scheme of the invention, PAM and PWM joint driving is achieved, reliable display of the LED array can be realized when the LED array is in a high gray scale or a low gray scale, and the gray scale uniformity of the LED array can be effectively improved, so that accurate gray scale control can be realized, and the display effect of the LED array is improved.

The invention relates to the field of corrosion of steel bars in concrete and particularly relates to a method for predicting initial corrosion time of steel bars in concrete. The method comprises thefollowing steps: taking chloride ion diffusion coefficients as a random variables, determining a group of chloride ion diffusion coefficient data according to experiment, combining with a migration model of chloride ions in the concrete to obtain time data reaching critical concentration of the chloride ions when reaching a certain depth, and building a response surface of the chloride ion diffusion coefficient and the time reaching critical concentration of the chloride ions; actually measuring a group of time reaching the critical concentration of the chloride ions and obtaining a group ofnew chloride ion diffusion coefficients by using the response surface; combining the group of new chloride ion diffusion coefficients with the migration model of chloride ions in the concrete to obtain a group of initial corrosion time data of the steel bars in the steel bar depth, and counting to obtain the probability distribution of the initial corrosion time of the steel bars.

The invention discloses a metallic micro component pickup method based on electrochemical deposition, relates to the metallic micro component pickup method, and aims to solve the problem that an existing metallic micro component is difficult to pick up and prone to damage. The pickup method comprises the following steps of calculating the minimum nozzle radius of a pipette capable of successfullypicking up according to stress conditions of a pick-up object and selecting a pipette; and calculating steady-state current, deposition height and deposition time, and then switching on a power supplyfor pick-up. According to the metallic micro component pickup method, when metallic micro components are required to pick up, the adopted pipette is small in size, and can pick up the metallic microcomponents of various types so that have application in producing complex micro electro mechanical system, and meanwhile the metallic micro components are not damaged when being picked up. The methodis suitable for picking up metallic micro components.

The invention provides a control method and system for a reducing furnace. The control method comprises the following steps of: sending a detecting signal to a reducing furnace electrical control cabinet by utilizing a DCS through the same communication interface for sending a current control signal, determining whether communication between the DCS and the reducing furnace electrical control cabinet has faults or not by judging whether the detecting signal is received or not through the reducing furnace electrical control cabinet, distinguishing whether the reducing furnace normally stops or communication between the DCS and the reducing furnace electrical control cabinet is interrupted, and timely removing communication faults when the communication is interrupted; and while judging the communication faults, keeping current at present of the reducing furnace unchanged, providing a stable current control signal to the reducing furnace through the reducing furnace electrical control cabinet, preventing the reducing furnace from current fluctuation or stop, thereby realizing stable operation of the reducing furnace when the communication between the DCS and the reducing furnace electrical control cabinet has faults.

The invention discloses an electrolysis hydrogen furnace and provides a gas furnace capable of buffering. The electrolysis hydrogen furnace consists of a hydrogen burning stove, a pressure reducing valve, a hydrogen pressure storage tank, a micro pressure pump, a weak-base electrolytic tank, an oxygen conduit and a DC (direct current) power supply, wherein after the DC power supply is turned on, water in the weak-base electrolytic tank is decomposed, the anode generates oxygen which is guided out by the oxygen conduit, the cathode generates hydrogen and is pressurized by the micro pressure pump and stored in the hydrogen pressure storage tank; when in use, pressure is reduced by the pressure reducing valve and supplied to the hydrogen burning stove; and therefore, a great amount of energy can be buffered, high-power release is performed in short time, current fluctuation is avoided, 0.5-50m<3> of hydrogen can be supplied per day and applied to the places such as small and medium-sized canteens, boilers and the like, the utilization rate of renewable energy is improved, and the pollution is remarkably reduced.

The invention provides a calcium carbonate dry-grinding hydraulic system and a control method thereof. The calcium carbonate dry-grinding hydraulic system comprises an oil tank, an oil pump, a hydraulic cylinder, a millstone, a first reversing valve, a second reversing valve, a third reversing valve and a pressure sensor. The first reversing valve and the second reversing valve are connected between the oil pump and the hydraulic cylinder, so that the oil pump supplies oil to a first cavity of the hydraulic cylinder or a second cavity of the hydraulic cylinder. When the oil pump supplies oil to the second cavity and the millstone lowers, the pressure sensor measures the pressure in real time; when the measured pressure is smaller than a set upper limit, a first coil of the first reversing valve is electrified to allow the millstone to continuously lower; when the measured pressure is larger than the set upper limit, the first coil of the first reversing valve is power off and pressurizing is stopped; when the measured pressure is smaller than a set lower limit, the first coil of the first reversing valve is electrified to allow the millstone to continuously lower, and pressure supplementing is achieved; when the measured pressure is larger than the set lower limit, the millstone is in the state of pressure maintaining.

The invention discloses a field emission light source comprising sidewalls, a cathode substrate, an anode substrate, a cathode conducting layer, an anode conducting layer, and a light emitting layer. A sealed cavity is formed by the sidewalls, the cathode substrate, and the anode substrate and is fully filled with neutral gases. The neutral gases comprise at least one of a group including hydrogen, nitrogen, helium, and argon. The cathode conducting layer and the cathode substrate are arranged in a laminated manner. The anode substrate, the anode conducting layer, and the light emitting layer are successively arranged in a laminated manner. The cathode conducting layer and the light emitting layer are arranged oppositely and the light emitting layer contacts the neutral gases directly. The sealed cavity of the field emission light source is fully filled with the neutral gases used as an electron source. High voltage is applied to the anode conducting layer and the cathode conducting layer such that the neutral gases in the sealed cavity are ionized to form positive ions and free electrons. The light emitting layer is bombarded by the free electrons so as to emit visible light. Thus, the field emission light source emitting stable and uniform light is obtained.

The invention relates to a method for controlling an electronic power converter (9), which is connected to a direct-current source (12), comprises power conductor switches (10a...10f) that can be deactivated and which is designed to supply a distribution network (2) with three-phase voltage. According to said method, the currents that flow through the respective power semiconductor switches (10a...10f) are measured, whereby current values that are respectively assigned to the power semiconductor switches (10a...10f) are obtained, the current values are sampled and the sampled current values are digitised to obtain digital current values, the latter being checked by a logic that is implemented in a control unit for the presence of an excess current condition. If no excess current condition is detected, the power semiconductor switches (10a...10f) are activated and deactivated with the aid of a nominal operation controller and if an excess current condition is detected, at least the power semiconductor switches with assigned digital current values that fulfil the excess current condition are deactivated after a pulse block has expired. For the digital current values that fulfil the excess current condition, all power semiconductor switches (10a...10f), which are connected to the positive direct-current connection, are activated and all power semiconductor switches, which are connected to the negative direct-current connection are deactivated or vice versa. For the digital current values that do not fulfil the excess current condition, The power semiconductor switches (10a...10f) are controlled once again by the nominal operation controller.