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

The invention relates to the technical field of photovoltaic grid-connected inverters. A photovoltaic inverter employing a hybrid type power device comprises two parts, namely, a power inversion unit and an inversion control unit, wherein the power inversion unit mainly comprises an input EMI (Electro-Magnetic Interference) filter circuit, an interleaving Boost boosted circuit, a full bridge inversion circuit employing a mixer and an output grid-connected filter circuit; the inversion control unit mainly comprises a power grid phase detection circuit, a sampling circuit and a controller. The photovoltaic inverter adopts a double-stage structure, and the first stage adopts interleaving Boost boosted voltage, so that the fluctuation of current is reduced, and output voltage ripple is reduced; the later stage inversion unit adopts a hybrid power device, so that the inversion consumption is effectively reduced, and the system efficiency is improved. The photovoltaic inverter has the characteristics of simple structure, easiness in circuit control and convenience in capacity expansion.

The invention discloses a high power factor constant current light-emitting diode (LED) lighting circuit with a simple structure, a few components and a long LED service life. The high power factor constant current light-emitting diode (LED) lighting circuit comprises a rectifier circuit (1), an LED light source load (2), and a constant current source circuit (3). The high power factor constant current LED lighting circuit does not include a filter capacitor. An alternating current is rectified by the rectifier circuit (1) and then converted into a pulsating direct current. The pulsating direct current forms a loop through the LED light source load (2) and the constant current source circuit (3). The constant current source circuit (3) performs voltage regulation and current stabilization of the LED light source load (2). An LED light source load (4) comprises at least one group of a plurality of LEDs which are connected in series. A constant current source circuit (6) comprises at least one group of constant current source devices. Each group of constant current source devices comprises at least one depletion mode field effect transistor. The drain of the depletion mode field effect transistor is a contact. The source and the grid of the depletion mode field effect transistor are in short connection and form another contact. The high power factor constant current LED lighting circuit can be widely applied in field of LED lighting circuit.

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 an assembly die, in particular relates to an electron gun assembly die and an assembling method thereof. The electron gun assembly die comprises an upper location die, a cover die and a supporting seat, wherein the upper location die covers and presses on the cover die; and the supporting seat is placed under a cover plate of the gun. Through the whole set of assembly dies of the electron gun and a proper technical operation process, a non-inductive electron-tube heater and a lead electrode can be well contacted so as to avoid current fluctuation or more serious consequences caused by heat emission and ignition of current, ensure concentricity of an emitting surface of the non-inductive electron tube heater, a focusing electrode hole and a shoulder surface of the cover plate of the gun and non-deviated non-defocused electron bunch. The assembly die ensures the interelectrode distance between the emitting surface of the non-inductive electron tube heater and an end surface of a focusing electrode, contributes to electron emission. By the die and the correct technical operation, the yield of the electron gun can be improved, the optical parameter requirement of electrons can be ensured, and parts of the electron gun have good interconvertibility and other significant effects.

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 a hybrid triggering type driving power source for a power system fault detector. The hybrid triggering type driving power source mainly comprises a diode rectifier U, a nonlinear trigger circuit connected with the diode rectifier U, a buffering crystal oscillator circuit and a quartz crystal oscillator circuit, wherein the buffering crystal oscillator circuit and the quartz crystal oscillator circuit are connected with the nonlinear trigger circuit. The hybrid triggering type driving power source is characterized in that a power logic voltage-stabilizing circuit is connected between the diode rectifier U and the nonlinear trigger circuit and mainly comprises a power amplifier P1, an NAND gate IC1, an NAND gate IC2, an NAND gate IC3, an NAND gate IC4 and a diode D2, wherein the N pole of the diode D2 is connected with the output end of the power amplifier P1 and the P pole of the diode D2 is grounded after passing through a resistor R4. According to the hybrid triggering type driving power source, the circuit structure can be greatly simplified, radio-frequency interference of the circuits and radio-frequency interference of external connection can be lowered, and the manufacturing cost and the maintenance cost are greatly lowered.

The invention discloses a novel light beam excitation type image processing system based on a logic protection emitter-coupled type. The novel light beam excitation type image processing system based on the logic protection emitter-coupled type is mainly composed of an image sensor, a drive circuit and a processing circuit, wherein the drive circuit is connected wit the image sensor, and the processing circuit is connected with the drive circuit. The novel light beam excitation type image processing system is characterized in that an emitter-coupled type asymmetrical triggering circuit, a light beam excitation type logic amplifying circuit and a logic protection emitter-coupled type amplifying circuit are further arranged, the emitter-coupled type asymmetrical triggering circuit is connected with the drive circuit and the processing circuit, the light beam excitation type logic amplifying circuit is connected with the processing circuit, and the logic protection emitter-coupled type amplifying circuit is connected between the laser beam excitation type logic amplifying circuit and the drive circuit in series. According to the novel light beam excitation type image processing system, the overall structure is quite simple, after the emitter-coupled type asymmetrical triggering circuit is combined with the novel light beam excitation type image processing system, the processing speed of the novel light beam excitation type image processing system is greatly increased compared with a traditional speed, the processing time of an image with 1028*1028 pixels is just 0.3s, and the processing speed is over 20 times as high as a traditional processing speed.

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 discloses a stable energy harvesting device for a high-voltage transmission line and an application method thereof. The energy harvesting device includes a damping branch, an energy harvesting branch and an impedance regulating branch. The impedance regulating branch includes a regulating magnetic core T3 and a second wire l3 , a control rectifier circuit, a supercapacitor energy storage unit and an inverter circuit, a first switch K1 is connected in series between the second wire l3 and the power transmission cable, and a series connection between the supercapacitor energy storage unit and the load connection terminal of the energy-taking branch A second switch K2 is connected, and a third switch K3 is connected in series between the supercapacitor energy storage unit and the inverter circuit; the application method includes using the impedance regulation branch as a controllable current source to control the charging of the supercapacitor energy storage unit, The switching of the discharge state and the connection state of the output of the inverter circuit adjust the impedance of the damping branch to realize the stable energy collection of the high-voltage transmission line. The invention can obtain stable energy acquisition for the load when the current of the transmission line changes, and has the advantages of high energy acquisition stability, good real-time performance and fast response.

The invention relates to the technical field of photovoltaic grid-connected inverters. A photovoltaic inverter employing a hybrid type power device comprises two parts, namely, a power inversion unit and an inversion control unit, wherein the power inversion unit mainly comprises an input EMI (Electro-Magnetic Interference) filter circuit, an interleaving Boost boosted circuit, a full bridge inversion circuit employing a mixer and an output grid-connected filter circuit; the inversion control unit mainly comprises a power grid phase detection circuit, a sampling circuit and a controller. The photovoltaic inverter adopts a double-stage structure, and the first stage adopts interleaving Boost boosted voltage, so that the fluctuation of current is reduced, and output voltage ripple is reduced; the later stage inversion unit adopts a hybrid power device, so that the inversion consumption is effectively reduced, and the system efficiency is improved. The photovoltaic inverter has the characteristics of simple structure, easiness in circuit control and convenience in capacity expansion.

Method for regulating a converter (9) connected to a direct voltage source (12) and having a disconnectable power configured to supply a distribution network (2) with a three-phase voltage Semiconductor switch (10a...10f), wherein the current flowing through each power semiconductor switch (10a...10f) is obtained under the condition of obtaining the current value corresponding to the power semiconductor switch (10a...10f). Measurement is carried out, the current value is sampled, the sampled current value is digitized under the condition of obtaining a digital current value, and the digital current value is checked by a logic implemented in the regulating unit to see whether an overcurrent occurs. conditions, wherein the power semiconductor switches (10a...10f) are switched on and off by means of the nominal operating control if an overcurrent condition is not met, and at least switched off if an overcurrent condition occurs. Turn on the power semiconductor switches loaded with a digital current value that satisfies the overcurrent condition, and after the expiration of a pulse blocking duration and under the condition of a digital current value that satisfies the overcurrent condition, turn on all power semiconductor switches connected to the positive DC terminal (10a...10f) and disconnect all power semiconductor switches (10a...10f) connected to the negative DC terminal, or vice versa, and in which, without satisfying the digital current value of the overcurrent condition, pass again The nominal operating control controls the power semiconductor switches (10a...10f).

The present invention discloses a flash memory control apparatus and a flash memory mobile storage apparatus. The flash memory control apparatus comprises a mobile device host interface unit, a command analysis unit, a data processing unit, a clock generator unit and a flash memory interface unit. The flash memory mobile storage apparatus comprises the flash memory control apparatus and a flash memory. The command analysis unit determines a data operation command sent by a mobile device host and generates a clock frequency control signal according to a determination result; the clock generator unit generates flash memory system clocks with different frequencies according to the clock frequency control signal; and the flash memory control apparatus reads and writes data according to the frequencies. According to the flash memory control apparatus and the flash memory mobile storage apparatus disclosed by the present invention, on the premise of satisfying maximum power supply current restriction of the mobile device host, the read / write performance of the flash memory is improved to the maximum extent.

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 rotating speed measurement and control method based on a high-precision centrifugal acceleration system. A device for implementing the method is mainly composed of a control cabinet, a program control voltage regulation cabinet and a high-power rectification chopping cabinet which are connected through cables. The control system adopts a position, speed and current three-loop feedback control principle, wherein a current loop adopts a filter capacitor for regulation and control, so that current fluctuation and oscillation are prevented, and stable control of output voltage is ensured. In the design of a controller, a dynamic neural network controller based on performance optimization is provided, system energy consumption is considered in a conventional neural network control algorithm, an adjustment law of neural network weight is given based on a back propagation algorithm, and the designed controller ensures system tracking precision, reduces control energy consumption, and improves the overall control performance of the system.

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 operating at least one electric component (11) of a vehicle (10) using a battery (12). At least two battery cells (30) of the battery (12) are electrically connected to the at least one component (11) via at least one respective switching unit (20) and are thus switched on, wherein the following steps are carried out in order to pre-charge an intermediate circuit (13) of the vehicle (10): a) switching on a first battery cell (30a) of the battery cells (30) and b) switching on at least one second battery cell (30b) of the battery cells (30) in steps, in each case following a previous switching on process.

The invention discloses a driving power source for a power system fault detecting device. The driving power source mainly comprises a diode rectifier U, a power amplifier P1, a transformer T, a switch filter circuit, a slider regulator, a power output circuit and a voltage transformation feedback circuit. The switch filter circuit is arranged between an anode output end of the diode rectifier U and a same-phase end of the power amplifier P1 in a serial connection manner, the slider regulator is connected with a sliding tap of a primary coil L1 of the transformer T, the power output circuit is connected with a secondary coil L2 of the transformer T, and the voltage transformation feedback circuit is connected with a secondary coil L3 of the transformer T. The driving power source has the advantages that high-quality input voltages can be provided for the transformer T by a novel power logic voltage stabilizing circuit, accordingly, circuit structures can be simplified, radio frequency interference of the circuits and external radio frequency interference can be reduced, and the manufacturing cost and the maintaining cost can be greatly lowered.

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.

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 relates to the technical field of high-voltage line power taking, especially to an integrated CT induction electricity taking circuit and device. The integrated CT induction electricitytaking circuit comprises a CT induction input circuit, a lightning protection circuit and a discharge absorption circuit. The output end of the secondary side of the CT induction input circuit is connected with the lightning protection circuit, the output end of the lightning protection circuit is connected with a discharge absorption circuit, and the discharge absorption circuit is used for beingswitched on when the output voltage of the lightning protection circuit exceeds a threshold value. The integrated CT induction electricity taking device comprises the CT induction electricity takingcircuit and an output circuit. According to the integrated CT induction electricity taking circuit and device, interference on output of the CT electricity taking device when current of a high-voltagetransmission line fluctuates in a large range can be eliminated, normal work of a load is guaranteed, the problem that a common electricity taking device cannot solve the problem that extremely low current and extremely high current occur on the same cable at the same time is solved, and the CT electricity taking device has the advantages of small size, light weight, high power, high efficiency,convenience in installation, more stable performance and the like.

The invention discloses a logic control circuit based power source for a power system fault detection device. The power source mainly comprises a transformer diode trigger circuit, a power logic control circuit, a primary crystal oscillating circuit and a secondary crystal oscillating circuit, wherein the primary crystal oscillating circuit and the secondary crystal oscillating circuit are connected with the transformer diode trigger circuit. The power source is characterized by further comprises a power logic control circuit connected with the transformer diode trigger circuit, the transformer diode trigger circuit comprises a diode rectifier U, a transformer T and a trigger circuit, and the primary crystal oscillating circuit and the secondary crystal oscillating circuit are both connected with the trigger circuit . The logic control circuit based power source has the advantages that circuit structures can be greatly simplified to reduce intrinsic and external radio-frequency interference for the circuits, and accordingly manufacturing cost and maintenance cost are greatly reduced; in addition, delay effects of traditional power circuits can be overcome effectively, and quality of the power source can be effectively improved.

The invention relates to a safety circuit for fail-safe switching off of dangerous technical equipment, which has a number n ≥ 2 switchable equipment components, the safety circuit comprising a plurality of safety switching devices, which are connected in communication with each other and have Fail-safe control units, wherein each fail-safe control unit is equipped with plant components and is configured to detect and analyze information about the current operating state of the plant components assigned to it, wherein the safety switching devices are connected in series and form a monitoring loop , in which case the monitoring current can flow through the safety switching device, the safety switching device comprising a through current changing device, which is arranged for changing the through current in the monitoring circuit if a safety request is detected by the safety switching device concerned ; The fail-safe control unit is configured to generate a cut-off signal when the passing current changes, which can cause the fail-safe cut-off of the non-cut-off equipment components connected to the fail-safe control unit.

The present application relates to a position sensorless BLDCM closed-loop starting method, device and BLDCM control equipment. The position sensorless BLDCM closed-loop startup method includes sequentially controlling the current loop PI regulator, observer PI regulator and speed loop PI regulator to enter the closed-loop working state according to the set execution cycle; according to the three-phase current detection results of the current loop PI regulator , to determine the current operating state of the position sensorless BLDCM under the set initial quadrature axis current; according to the current operating state of the position sensorless BLDCM and the set minimum electrical angle speed reference threshold, adjust through the current loop PI regulator and observer PI Controller and speed loop PI regulator closed-loop start sensorless BLDCM. During the entire start-up process of the position sensorless BLDCM, the control speed outer loop, current inner loop and speed / angle observer are all in a closed-loop working state, which effectively reduces the start-up current and shortens the start-up time, and achieves the purpose of effectively improving the start-up efficiency.

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.