41results about How to "Limit output" patented technology

An LED drive circuit that drives an LED is provided with: a rectifying circuit that converts an alternating voltage into a pulsating current; a constant current circuit; and an over-temperature protection portion that limits an output of the constant current circuit, wherein the LED and the constant current circuit are connected in series on an output side of the rectifying circuit.

The invention provides a method for returning fruit tree branches to orchards, relating to orchard management technology, in particular to a method for applying trimmed fruit tree branches to the orchards as organic fertilizers. The method comprises the following steps: a. cutting/sawing the trimmed branches with diameters being more than 2cm into shorter branches with length being 15-20cm for later use; b. digging trenches with length being 100-150cm, width being 60cm and depth being about 50cm along water drips of the fruit trees and digging at least two trenches for each tree; and c. putting the branches with diameters being less than 2cm and the shorter branches in the step a into the dug trenches, covering one layer of branches with one layer of soil and covering the last layer of branches with 20-30cm deep soil, wherein the mass of the branches buried in each trench is not beyond 10kg each year. The method has the following beneficial effects: after the branches are returned to the orchards, increase of soil organic matters provides rich nutrients and energy for growth and reproduction of soil microorganisms so that the microorganism quantity is increased; and as the quantity of the microorganisms in the soil is increased, anthropogenic mellowing of soil can be accelerated to convert the slightly soluble nutrients into soluble nutrients.

The invention relates to a large-scale planting method of organic polygonatum kingianurn under an artificial pine forest. The method includes the steps of selecting the artificial pine forest suitablefor polygonatum kingianurn growth and with the soil environment quality, irrigation water quality and environment air quality conforming to the national standards to plant the polygonatum kingianurn,applying rotten farmyard manure as a base fertilizer, keeping the under-forest light permeability at 25-30%, covering the ground for planting the polygonatum kingianurn with pine needles, keeping thesoil water content at 25% or above, preventing and treating the leaf spot disease or tan disease with a copper hydroxide solution, pouring a Bordeaux mixture on roots to prevent and treat the root rot, planting Chinese cabbage on the edges of a forest land to attract injurious insects (scarab or agrotis ypsilon) to eat, pouring a radix sophorae flavescentis alkaline water agent on roots to prevent and treat larvae, and inducing and killing adult insects through venom prepared by mixing sweet and sour liquid and a radix sophorae flavescentis alkaline water agent. The organic production aims for the environment and polygonatum kingianurn product quality safety are realized, the organic production cost is reduced, and the organic product quality is improved.

The invention discloses a self-oscillation hiccup-type short circuit protection circuit and a design method therefor. The circuit comprises a power switching circuit, a current detection circuit, an overcurrent and short circuit discrimination circuit, a power switching drive circuit, a reference voltage circuit, and an oscillation time delay recovery circuit. The method comprises the steps: 1, selecting proper parameters forming the current detection circuit; 2, selecting proper parameters forming the overcurrent and short circuit discrimination circuit; 3, selecting the formed overcurrent and short circuit discrimination circuit to be connected with the current detection circuit; 4, selecting proper parameters forming the reference voltage circuit; 5, forming the reference voltage circuit, and enabling the reference voltage circuit to be connected with the overcurrent and short circuit discrimination circuit; 6, selecting proper parameters forming the oscillation time delay recovery circuit; 7, forming the oscillation time delay recovery circuit, and enabling the oscillation time delay recovery circuit to be connected with the reference voltage circuit; 8, connecting the self-oscillation hiccup-type short circuit protection circuit. According to the invention, the self-oscillation hiccup-type short circuit protection circuit achieves the overcurrent and short circuit protection, and can set the automatic recovery time of the power switching circuit.

The invention discloses a phase-controlled valve. The phase-controlled valve comprises a base pipe (1), flow limiting valves (2) are mounted on the base pipe (1), a lower end cover (4) of each flow limiting valve (2) is provided with an annular flow passage (5) and a control chamber (7), the side wall of the control chamber (7) is provided with a sluice (9) through which the annular flow passage (5) and the control chamber (7) are communicated, and the base pipe (1) is provided with a base pipe liquid inlet (10) communicated with a nozzle (8) of the control chamber (7). The phase-controlled valve has the advantages that fluids can be distinguished, oil and water can be separated automatically, water output is limited to balance profiles and eliminate heel effects, annular flow influences are eliminated, productive life of an oil-gas well can be prolonged, recovery efficiency of a control reservoir of a horizontal well can be improved beneficially, and the phase-controlled valve is applicable to edge/bottom water reservoirs high in anisotropism.

The invention designs a feeding device with intelligent monitoring and adjustable discharging amount. The device mainly comprises a motor, a charging barrel, a main shaft, a spraying device, a feedingtrough, a discharging outlet adjusting device, a drinking device and a charging level indicator. The motor is arranged at the geometric center of a crossbeam, the charging barrel is arranged in the middle between left and right supports, the main shaft is fixed through the motor and the charging barrel, the discharging outlet adjusting device is arranged below the charging barrel, the spraying device is arranged at a discharging outlet at the lower part of the charging barrel, the feeding trough is arranged on a base plate, and the drinking device is arranged above the feeding trough. According to different feeding demands of livestock and poultry, the feeding device adjusts the upper and lower positions of an outer sleeve to change the size of the discharging outlet, reducing the phenomenon of feed vomiting and waste; the feeding device adopts variable pitch spiral conveying to control the discharging amount and avoid the feed clogging; the feeding device monitors the height of the feed layer intelligently, and improves the feed utilization rate; and spray droplets from spray nozzles reduce the occurrence probability of respiratory diseases of the livestock and poultry. The feeding device is simple and reasonable in structure, convenient in operation and strong in adaptability.

The invention discloses a brushless excitation-type generator set rotation diode detection system. The system comprises a large shaft gap detection coil, a first current induction detection coil, a second current induction detection coil and a state detection module. The large shaft gap detection coil, the first current induction detection coil and the second current induction detection coil are arranged in a periphery of a static part of a generator set respectively. The state detection module is used for detecting whether a rotation diode branch has a fault according to induction signals of the large shaft gap detection coil, the first current induction detection coil and the second current induction detection coil and carrying out alarm when the fault is discovered. The invention also discloses a brushless excitation-type generator set rotation diode detection method. In the invention, a sensor does not need to be additionally installed; through using a rotation rectification excitation type generator set, arrangement positions of the detection coils depend on a generator body structure; and positioning, alarm, fault and other development functions can be realized.

The invention relates to the field of power supply control, in particular to a current detecting circuit and a feedback control circuit applied to a laminated control power supply, and a power supply. Each transformer of the laminated control power supply has more than two parallel taps, a voltage regulator is arranged in each tap branch circuit, and a main circuit current detecting device is arranged at a common output ends of the parallel tap branch circuits. The current detection device comprises branch current computing modules, and one branch current detecting module is arranged on one of any two adjacent tap branch circuits; the branch current detecting devices and the main circuit current detecting devices are connected with the branch current computing modules; the branch circuit computing modules are used for computing current of the tap branch circuits. According to the current detecting circuit and the feedback control circuit applied to the laminated control power supply, and the power supply, a manner that a current detecting device is arranged on every one branch circuit is utilized, so that the application of current detectors in the current detecting circuits is largely reduced.

The invention discloses a controller for automatic separation of oil and water. The device is mainly composed of two parts, the valve base (1) and the valve cover (2). The valve base (1) is provided with an inflow channel (3) to accelerate the swirling chamber (4) to accelerate the fluid. Under the action of the diversion groove (5), the fluid enters the swirling separation chamber (9) tangentially, and The water and oil are introduced into the water swirl chamber (7) and the oil flow chamber (12) enclosed by the shunt baffle 10 through the water guide groove (6) and the oil guide groove (11),and finally the oil and water are respectively discharged from the water outlet (8). The oil outlet (13) flows out. The device can automatically separate oil and water, and increase the pressure dropof the water phase through multiple resistance increasing structures to restrict the flow of the water phase. For the wells that have been seen, it can limit water production, achieve the purpose ofstabilizing oil and controlling water, and improve the life of oil wells. At the same time, the device does not have movable parts and can be applied to sand wells.

The invention discloses a PWM signal power-up and power-down protection circuit comprising a hysteresis comparison circuit, an AND gate circuit, a first power supply monitoring circuit, a second power supply monitoring circuit and a buffer circuit. The AND gate circuit is respectively connected with the hysteresis comparison circuit, the first power supply monitoring circuit, the second power supply monitoring circuit and the buffer circuit. The power supply monitoring and comparison circuits are arranged so that the situation of circuit power supply can be monitored at any time. When the circuit is in the power-up state and voltage is lower than the preset threshold value, output of a PWM signal is limited. When the circuit is in the power-off state, the arranged triode is not conducted, output of the PWM signal from the buffer module is prohibited and thus the PWM signal is locked and a semiconductor device is protected. When the circuit is in the power-up state, the PWM signal is unlocked when all stages of level reaches a certain limit so that damage to the semiconductor switch device caused by initial power-up or power-down of certain stage of level is avoided, the service life of the semiconductor switch device is prolonged and product cost is saved.

The present invention suppresses damage to a rotary impact tool. A rotary impact tool includes a motor, an impact mechanism, and a control unit. The impact mechanism is provided with a hammer body andan anvil, and when a torque greater than or equal to a predetermined value is applied to the anvil from the outside, the hammer body is disengaged from the anvil and idles to impact the anvil in therotational direction. The hammer body rotates due to the torque of the motor. The anvil rotates by receiving the torque of the hammer body, and a tool element is mounted on the anvil. The control unitcontrols the motor. Furthermore, the control unit restricts the output of the motor when the load applied to the motor is equal to or greater than a preset restriction determination value.

The invention discloses an oil well fluid self-adaption device and a fluid control device. The oil well fluid self-adaption device comprises an oil pipe and an outer pipe and further comprises the fluid control device, the oil pipe is concentrically arranged in the outer pipe, an annular channel is formed between the oil pipe and the outer pipe, the outer pipe is provided with an outer pipe fluidinlet, the oil pipe is provided with a radial fluid control port, and the radial fluid control port is provided with the fluid control device. The oil well fluid self-adaption device can automaticallyadjust flowing resistance passing through the oil well fluid self-adaption device according to fluid properties, specifically, when the water content is low, the oil well fluid self-adaption device has certain resistance to a fluid, the influence of the heel end effect and reservoir heterogeneity can be offset, and a production profile is propelled in a balanced mode; and along with the increaseof the water content, the flowing resistance of the fluid control device is remarkably increased, the flow of a water outlet layer section is remarkably inhibited, and long-term stable production of an oil-gas well is guaranteed.

According to the hot plug protection device and method for look-ahead dynamic temperature monitoring, the hot plug protection device is additionally arranged, an MOS is embedded into an IC chip, it is ensured that a temperature monitoring reporter can read the most accurate data and obtain the corresponding Rds (on) value, VGS voltage conversion can be more accurately and effectively controlled, and then the purposes of reducing VGS voltage, reducing VGS voltage and improving VGS voltage conversion efficiency are achieved. Therefore, when a large current or a short circuit occurs, the capability of limiting the conduction current can better ensure that the MOS is operated in a safe working area, and the purpose of improving the protection system is achieved. The MOS is embedded into the IC, and the temperature monitoring reporter is added to ensure that the reading value is accurate and is not influenced by external factors; the MOS is embedded into the IC, and a base and source conduction impedance comparator is added, so that the Rds (on) parameter of the MOS can be ensured not to be influenced by external factors corresponding to the temperature change; the VGS voltage is reduced to limit the output of the Id current; the Id current is inhibited to ensure that the MOS is operated in a safe working area; and the influence of an RC buffer time length error outside the IC is not limited.

The invention discloses an OLED screen body used for a fingerprint recognition device as well as a fingerprint recognition device. The OLED screen body comprises a substrate and a light-emitting partencapsulated on the substrate by virtue of an encapsulation cover plate; the light-emitting part comprises an organic functional layer as well as a reflecting electrode and a base electrode respectively arranged at the two sides of the organic functional layer; the organic functional layer is internally provided with a light-emitting layer and a plurality of organic layers arranged at the two sides of the light-emitting layer; the reflecting electrode is arranged at one side, far away from the light-emitting layer, of a light-exiting surface; and distance between the reflecting electrode and the light-emitting layer meets a set formula. The OLED screen body disclosed by the invention has the advantages that the distance between the reflecting electrode and the light-emitting layer in the OLED screen body is uniquely selected, most lights with fixed wavelength are limited by the substrate or the encapsulation cover plate in a total reflection form or are emergent in a lateral light form, and strength and accuracy of a received signal are enhanced, so that recognition sensitivity of the fingerprint recognition device is improved.

The invention discloses an anaerobic gas making process for excess activated sludge. According to the process, the excess activated sludge is subjected to mechanical dewatering firstly and then fed into an electrolytic cell for further dewatering under the action of a treating agent, then the sludge is fed into an anaerobic reactor, anaerobic granular sludge is added for an inoculation reaction, biogas residues and biogas are obtained after the reaction, part of the biogas residues serve as seed sludge of next batch of fermented sludge, and the remaining biogas residues are subjected to dryingtreatment. Excess sludge is reduced, and biogas resources are recovered.