212results about How to "Good voltage stabilization effect" patented technology

A method is described for controlling a plurality of power converters 1, 2 connected in parallel between an ac arrangement 12 and a common dc link 16, each of the power converters 1, 2 operating in accordance with a pulse width modulation (PWM) strategy and having an independently variable dc link reference voltage. The method comprises modifying an output voltage droop characteristic of at least one of the plurality of parallel-connected power converters 1, 2 by varying the dc link reference voltage of the at least one power converter 1, 2 based on the output current of the at least one power converter 1, 2 and the average of the output currents of the plurality of power converters 1, 2.

The invention discloses a vehicle-mounted combined battery intelligent power supply system and a power supply method. The combined battery, such as a double-battery parallel power supply device (12),a double-battery series power supply device (17) or a multi-battery series-parallel power supply device (21), is used for upgrading the traditional automobile storage battery; the intelligent power supply method, namely, the control unit (8), controls each of the battery switches in accordance with an engine state, such as shut down, start up and operation, and each battery voltage, to provide therequired electric power, the main contents include: providing a power supply similar to the conventional storage battery when the engine is stopped, and the battery leakage protection is provided asneeded; providing a higher starting voltage than a conventional storage battery to shorten the starting time when the engine is started; when the engine is in operation, a supplementary supply voltagewhich is not lower than a certain preset voltage is provided, so that the phenomenon of insufficient power supply influencing the stable operation of the engine won't occur in the electric appliancesystem.

The invention belongs to the field of electronic information and provides a high-voltage switch power supply for a power modulator of a travelling wave tube. The power supply comprises an input circuit, a low-voltage storage capacitor, an inverter circuit, a step-up transformer, a rectifying and filtering circuit, a voltage-dividing and sampling circuit and an isolation feedback circuit. The power modulator of the travelling wave tube is realized. The power supply is characterized in that: an isolation closed-loop feedback switch power supply and the low-voltage storage capacitor are adopted, so that high output voltage stability, small size and light weight of the power modulator for a travelling wave tube amplifier are ensured, reliability is enhanced and cost is lowered.

The invention discloses a ripple wave suppressor circuit of a program-controlled direct-current power supply. According to the ripple wave suppressor circuit of the program-controlled direct-current power supply, an active low-pass filter and a passive filter are connected between a positive output line of the direct-current power supply and a negative output line of the direct-current power supply after a capacitor C3 is connected between the positive output line of the direct-current power supply and the negative output line of the direct-current power supply, the active low-pass filter comprises an N-channel high-power MOSFET V1, a front-stage operational amplifier N1:1 with a dynamic compensation function and a rear-stage operational amplifier N1:2 with a dynamic compensation function, and the passive filter comprises an inductor L1 and a capacitor C1. According to the ripple wave suppressor circuit of the program-controlled direct-current power supply, high-frequency and low-frequency ripple wave noise output by the power supply can be lowered, the dynamic response performance can be improved, and the output precision and the stability are improved. The front-stage and rear-stage synchronous tracking control is adopted, accurate adjustment enabling the voltage difference to be low can be achieved, and the conversion efficiency of the power supply is effectively improved. As a result, the ripple wave suppressor circuit of the program-controlled direct-current power supply has high application value in the aspect of design of high-precision program-controlled power supplies.

The invention provides a device for enhancing smoke extraction effect. The device comprises a pressure stabilizing cavity and a wind direction change room, wherein the pressure stabilizing cavity is provided with an air inlet; the wind direction change room is communicated with the pressure stabilizing cavity and provided with an air outlet; and the wind direction changer room is suitable for enabling airflow discharged from the air outlet to form a rotating state. In addition, the invention also provides a method for enhancing the smoke extraction effect, and a smoke exhaust ventilator including the device for enhancing the smoke extraction effect. By adopting the technical scheme disclosed by the invention, the formed negative pressure zone is concentrated and extends downwards. Compared with the traditional smoke exhaust ventilator, the suspension height is reduced; the smoke extraction effect is obvious; smoke escape is reduced; the sight and the operation of a user are not affected; and the smoke exhaust ventilator is convenient to use. In addition, the device can achieve good smoke extraction effect with low air quantity, and has the advantage of being energy-saving.

The invention relates to a device and a method for testing surface abrasion of a pavement material. The device comprises a control box, an abrasion test device, a grounding pressure data acquisition device, a velocity data acquisition device and a control device, wherein the control box comprises a box body, a box door and a control panel; the abrasion test device comprises a counter-force frame, a loading device, a transmission shaft, a synchronous belt pulley, a motor, an air compressor and a pneumatic cylinder; the grounding pressure data acquisition device comprises a pressure sensor and an area sensor; the area sensor is connected with the control device through a control line; the velocity data acquisition device comprises a reflective sticker and a counter; and the control device is respectively connected with the abrasion test device, the grounding pressure data acquisition device and the velocity data acquisition device. The device provided by the invention has the advantages of high automation degree and high operability by adopting double-wheel ring loading mode, and has good pressure stabilizing effect by adopting the pneumatic cylinder to apply vertical loads to the pavement material. The device not only can be used for simulation experiment indoors, but also can be applied to actual pavements.

The invention provides a gear type engine oil pump for reducing oil pressure fluctuation, and relates to the technical field of engine lubricating systems. The gear type engine oil pump comprises a pump body, a pump cover, a driving gear, a driving shaft, a driven gear, a driven shaft, a transmission gear and a pressure regulating valve, wherein the pressure regulating valve comprises a pressure regulating valve hole, a pressure regulating valve plunger piston arranged in the pressure regulating valve hole, and a pressure regulating valve spring; a feedback oil chamber is formed between one end of the pressure regulating valve plunger piston and the pressure regulating valve; a feedback oil pipe is arranged on the pump cover; a blocking screw is mounted at one end of the feedback oil pipe,and the other end of the feedback oil pipe communicates with the feedback oil chamber; a feedback oil pipe hole is formed in the feedback oil pipe; a feedback oil channel which enables communicationbetween the feedback oil pipe hole and an engine main oil channel is arranged on the pump body; the feedback oil channel comprises a damping hole channel; and the inside diameter of the damping hole channel is less than the inside diameter of the feedback oil channel. With the adoption of the gear type engine oil pump, oil pressure fluctuation fed back by the engine main oil channel can be greatlyfiltered, so that the problem that the pressure regulating valve is turned on by mistake due to the oil pressure fluctuation can be extremely reduced.

The invention discloses a high-voltage electromagnetic valve state detection device and a high-voltage electromagnetic valve state detection method. The high-voltage electromagnetic valve state detection device comprises an air pressure regulation module, a pneumatic pump, an oil pipeline module, an electromagnetic valve, a relay, a sensor module, a power module, a control and acquisition module, and an upper computer, wherein the air pressure regulation module is connected with the pneumatic pump; the air pressure regulation module provides a working air source for the pneumatic pump, and the pressure of the air source can be regulated; the pneumatic pump is connected with the oil pipeline module; the pneumatic pump provides oil pressure for the oil pipeline module; the oil pipeline module is connected with the electromagnetic valve; the electromagnetic valve comprises an inlet and an outlet, and the oil pipeline module provides specified oil pressure for the inlet and the outlet of the electromagnetic valve; and the electromagnetic valve is a tested object and is connected with the relay, the sensor module and the power module respectively, and the power module provides power for the electromagnetic valve, the sensor module and the control and acquisition module.

The invention relates to a double-screw extruder, and belongs to the field of plastic mechanical manufacturing. At present, a double-screw extruder with simple structure, reasonable design and two screws of different lengths is unavailable. The double-screw extruder comprises a driving motor, a distribution box with a driving gear and a driven gear, a reduction box, a machine cylinder, an exhaust system, a hopper, a feed system and a machine frame, wherein the driving motor, the distribution box, the reduction box and the machine cylinder are arranged on the machine frame; the reduction box, is connected with the driving motor; the driving gear in the distribution box is connected with the reduction box, and is matched with the driven gear; the feed system is connected with the machine cylinder; and the exhaust system is arranged on the machine cylinder. The double-screw extruder is characterized by also comprising a long screw and a short screw which are arranged on the driving gear and the driven gear; and the long screw and the short screw are both positioned in the machine cylinder. The double-screw extruder has reasonable structural design, scientific layout, stable pressure and excellent extruding performance, and combines the advantages of a single-screw extruder and the double-screw extruder.

The invention relates to liquid flow rate metering equipment and in particular to a liquid pressure-stabilizing device with a water tower pressure-stabilizing effect. The device comprises a pressure-stabilizing container I, wherein a liquid inlet pipe and a liquid outlet pipe are arranged at the sidewall lower part of the pressure-stabilizing container I; the liquid inlet pipe is connected with a water pump which is driven by a motor; the top of the pressure-stabilizing container I is provided with an air-release valve and a pressure gage. The device further comprises a pressure-stabilizing container II, wherein the top of the pressure-stabilizing container II is provided with an air-release valve and a pressure gage, and the bottom of the pressure-stabilizing container II is provided with a liquid discharge pipe. An overflow pipe is arranged at the sidewall upper part of the pressure-stabilizing container I; the other end of the overflow pipe is connected with the pressure-stabilizing container II; the top of the pressure-stabilizing container I is communicated with the top of the pressure-stabilizing container II through an air inlet pipe, and the air inlet pipe is simultaneously connected with an air source. According to the invention, the two mutually-communicated pressure-stabilizing containers are provided, and pressure stabilization can be realized without big pressure-stabilizing containers by using a water tower pressure-stabilizing principle, thus the liquid pressure-stabilizing device with the water tower pressure-stabilizing effect has the characteristics of small space occupation, good pressure-stabilizing effect and low cost of investment.

The invention discloses a 1000V output non-optocoupler isolation flyback DC-DC power supply circuit. The system comprises a dedicated DC-DC switching power supply control chip LT8304-1, a flyback isolation transformer module T1, a rectifier diode, a filter capacitor and a voltage output control module. The flyback isolation transformer comprises a primary winding and three independent secondary windings. The primary winding and the secondary windings are electrically isolated, and the turns ratio of the primary winding and the secondary windings is 1:10:10:10. The power supply improves the load regulation capability without an external load compensation component. The output current capability increases with the input voltage increasing. By sampling the isolated output voltage directly from the primary side flyback waveform, a voltage divider and an optical isolator are not needed; the 1000V output non-optocoupler isolation flyback DC-DC power supply circuit has a temperature compensation function, can compensate the output errors of the rectifier diode caused by temperature change and meets the application occasions of high voltages, isolation, wide temperatures and small sizes, and the power supply can supply excellent voltage stabilization performance with the change of the load, the voltage and the temperature.

The invention discloses a traditional Chinese medicine for treating hypertension and hypotension, which is prepared from the following Chinese medicine raw materials in parts by weight: 10-30 parts of sticktight, 5-20 parts of chrysanthemum indicum, 10-30 parts of kudzu vine root, 5-20 parts of haw and 10-20 parts of sophora flower. The pressure regulating and stabilizing prescription can regulate blood pressure bidirectionally and treat both the secondary and primary symptoms, has the functions of nourishing the liver and the kidney, soothing the liver, improving the heart and reducing the blood pressure, restoring the liver and the kidney, detoxicating, relieving internal heat or fever, reducing triglyceride, cholesterol and blood viscosity and eliminating blood stasis fundamentally, and is capable of acting on blood vessels and internal organs directly, softening hardened blood vessels, restoring blood vessel wall elasticity, further improving blood circulation, restoring the self-regulation function of a blood system and achieving the purposes of balancing yin and yang, improving microcirculation, regulating endocrine dysfunction, stably reducing the blood pressure and stabilizing the blood pressure.

The invention discloses a pressure relief structure, a booster pump and water purification equipment. The pressure relief structure comprises a pressure relief cavity shell and a pressure relief cover, wherein a pressure relief cavity is defined by the pressure relief cavity shell in an enclosed mode, and the pressure relief cavity shell is provided with a pressure relief opening communicating with the pressure relief cavity; and the pressure relief cavity shell is covered with the pressure relief cover, a sealing part is arranged between the pressure relief cover and the cavity wall of the pressure relief cavity, the sealing part surrounds the pressure relief opening, the pressure relief cover is further provided with a pressure relief gasket, and the pressure relief opening is blocked or opened by the pressure relief gasket. According to the technical scheme, the sealing capacity and pressure stabilizing capacity of the pressure relief structure of the booster pump can be improved.

The invention discloses a high power high accuracy switching linear compound potentiostat, which comprises the following parts: one output voltage reference forming unit and one power conversion unit, wherein the output voltage reference forming unit is provided power by input terminal power, which includes TL431 precision voltage-stabiliser tube N1, bleeder circuit conposed of resistance R1, R2 and adjustable resistance VR1; the power conversion unit is composed of fluidic devices; the collector connects input end; the base electrode connects to reference voltage signal; the emitting electrode connects to stabilivolt outlet end; the voltage reference forming unit can output continuance adjustable reference voltage signal with high accuracy, low noise, which outputs stabilised initialize voltage according to given reference voltage signal; the power conversion unit works in marginal saturated exlinear condition; the input and output voltage difference reduces to 1V; the output current can reach 5A; the stabilivolt accuracy can get 0.5%.

The invention relates to a double-pressure control proportional valve. The double-pressure control proportional valve comprises a main valve body, a main proportional valve and a servo proportional valve; the main proportional valve comprises a main proportional valve body provided with a spacing ring whose upper end communicates with a main intake way, a main proportional valve element inserted in the spacing ring and provided with a main proportional stopper opposite to the upper end of the spacing ring by the upper end, a pressure spring base connected with the lower end of the main proportional valve element, a main proportional leather film provided with a support plate opposite to the lower end of the pressure spring base and connected with the side periphery of the main proportionalvalve body by the outer edge, and a main proportional pressure spring whose two ends are correspondingly pressed at the lower end of the spacing ring and the upper end of the pressure spring base oneto one; a side hole communicating with the main exhaust way is formed in the side periphery of the spacing ring; the main valve body is provided with a servo intake way communicating with the main intake way by one end, and an exhaust way whose one end is positioned on the lower side of the main proportional valve leather film and other end communicates with an outlet of the servo proportional valve; and the other end of the servo intake way communicates with an inlet of the servo proportional valve and the main exhaust way. The double-pressure control proportional valve is flexible in outputpressure adjustment and better in pressure stabilization effect in short-time fluctuation of the gas pressure.

The invention discloses a numeric control power supply which comprises a mixed signal processor, wherein the mixed signal processor is connected with a contact switch array, an LCD (Liquid Crystal Display), an over-current and over-voltage protection circuit, a switch power supply conversion chip, a main circuit and a D/A (Digital/Analog) converter, wherein the switch power supply conversion chip is connected with a moving end of a single-pole double-throw switch S; two fixed ends of the single-pole double-throw switch S are respectively connected with a voltage stabilizing circuit and a current stabilizing circuit; the main circuit is connected with the voltage stabilizing circuit and the current stabilizing circuit; the D/A converter is connected with the voltage stabilizing circuit and the current stabilizing circuit. The numeric control power supply has the advantages of high efficiency, high precision, low power consumption and good transient response.

The invention discloses a self-pressure-loading type pressure regulator. The self-pressure-loading type pressure regulator is mainly composed of a main pressure regulating valve and a pressure regulating controller, wherein the regulating controller is of an integrated structure formed by connecting a pilot valve and a pressure regulating valve. The self-pressure-loading type pressure regulator is structurally characterized in that combined pressure regulating and pressure stabilizing structures are assembled in the pilot valve and the pressure regulating valve respectively, wherein each combined pressure regulating and pressure stabilizing structure is formed by connecting a pilot throttling valve clack and a pressure regulating throttling valve clack in series and used for carrying out secondary throttling and dual switching-off on pressure regulating signals; after secondary throttling pressure regulating and pressure stabilizing are carried out through the pressure regulating controller, stable pressure regulating signals are input into the main pressure regulating valve for pressure regulating and pressure stabilizing work, and then the purposes of automatically regulating output gas pressure and making the output gas pressure tend to be stable can be achieved. Trials show that the self-pressure-loading type pressure regulator indeed has the outstanding advantages of being simple in structure, reasonable in design, low in production and manufacturing cost, convenient to install and use, high in pressure regulating precision, good in output gas pressure stability, high in switching-off sealing property, safe and reliable in operation and long in service life, and has excellent application and popularization prospects in the gas delivery industry.

The invention relates to a novel pressure stabilization device for double-end surface sealing of a turbine pump. The novel pressure stabilization device comprises an oil cylinder, an oil inlet guiding pipe, a balance piston, a cylinder cover and a balance loop circuit, wherein the oil cylinder is fixedly arranged on a turbine pump body and is divided into an isoflurane oil cavity and a propellant cavity by the balance piston, one end of the oil inlet guiding pipe is fixedly arranged at one end of the oil cylinder and is communicated with the isoflurane oil cavity, the other end of the oil inlet guiding pipe is fixedly arranged on a turbine pump shell and is connected with a closed oil cavity, the cylinder cover is fixedly arranged at the other end of the oil cylinder, one end of the balance loop circuit is fixedly arranged on the cylinder cover and is communicated with the propellant cavity through the cylinder cover, and the other end of the balance loop circuit is fixedly arranged on the turbine pump body and is communicated with an oxidant pump inlet pipeline. The novel pressure stabilization device for the double-end surface sealing of the turbine pump, disclosed by the invention, has the advantages that the phenomenon that the end surface sealing is damaged due to abnormal high pressure of the isoflurane oil cavity during the work of a double-end surface sealing structure of an engine turbine pump is overcome, the volume is small, the weight is light, high temperature resistance and corrosion resistance are realized, the novel pressure stabilization device is beneficial for long-time storage and does not need to be subjected to secondary maintenance, and meanwhile, the high pressure of the isoflurane oil cavity can be eliminated.

The invention discloses a Zener diode and a manufacturing method thereof. The Zener diode comprises: a substrate; a well region of a first doping type, which is formed in the substrate; a first dopedregion of a second doped type, which is formed in the well region, wherein the first doped type is opposite to the second doped type; and a second doped region formed below the first doped region, wherein the first part of the lower surface of the first doped region is adjacent to the well region to form a first PN junction, the second part of the lower surface of the first doped region is adjacent to the second doped region to form a second PN junction, and the second doped region adopts a hard mask to limit a boundary extending transversely in order to make the boundary of the second doped region form a plane and an included angle between the plane and the vertical direction smaller than or equal to a first angle. Uniform doping of the second doped region can be realized, so that stability of breakdown voltage of the Zener diode can be enhanced, and reverse electric leakage before breakdown can be reduced.