145results about How to "Reduce differential pressure" patented technology

The invention discloses a thin-layer high-density filler which is prepared by combining an optimized weaving method, weaving density and a bundling mode on the basis of a plain woven wire mesh filler. The novel weaving method enables the weft number of the thin-layer high-density filler to be larger than that of plain woven wire mesh filler under the condition of the same warp number, and the thin-layer high-density filler has the characteristics of high specific surface area, high mass transfer efficiency, low flow pressure drop and the like. A large number of micropores exist on the surface of the thin-layer high-density filler, the wettability is extremely good, the transverse diffusion effect of liquid in the filler can be greatly enhanced due to the fact that the weft density is large, the performance is particularly outstanding in the processes of large-spraying-density rectification and the like, and the pressure drop is about 30%-50% lower than that of a common plain woven filler. The filler provided by the invention mostly adopts stainless steel wires as raw materials, and has the advantages of low cost, large flux, stable performance and low metal exudation rate, so that the filler is difficult to replace in the field of heat pump rectification, high-purity electronic chemical separation, intermediate separation and isomerism separation production.

The invention discloses a balance control method for a multi-branch battery pack, the battery pack comprises at least two branches, each branch comprises at least two battery sub-packs which are connected in series, and each battery sub-pack comprises at least one battery cell; the equalization control method comprises the following steps: sorting each battery sub-pack according to the magnitude of the minimum voltage of each battery sub-pack; for each branch, selecting at least two adjacent battery sub-packs in the sorting sequence to form a branch; different branches comprise different battery sub-packs; and when determining that the battery pack has at least one to-be-balanced branch, controlling each to-be-balanced branch to start a passive balancing strategy. The to-be-balanced branch is a branch in which the residual electric quantity of at least one battery cell is greater than the target residual electric quantity corresponding to the branch. The sequence of the battery sub-packs is flexibly adjusted according to the magnitude of the minimum voltage of the battery sub-packs, the minimum voltage difference in each branch is ensured, the balance requirement in each branch is reduced, and the consistency and the balance efficiency of the whole pack are better improved.

The invention provides a ceiling fan and a fan lamp, and belongs to the technical field of household appliances. The ceiling fan comprises a shell, a fan assembly and a plurality of air guide pieces. The fan assembly is located in the shell, and the air guide piece surrounds the fan assembly. The air guide piece is provided with a first air guide part, in a reference plane perpendicular to the central axis of the annular opening, the connecting lines between the head end and the central axis of the annular opening and between the tail end of the first air guide part and the central axis of the annular opening are set as a first reference line and a second reference line correspondingly, and the second reference line and the first reference line are sequentially arranged in the circumferential direction in the rotating direction of the fan assembly. The deflection direction of the first flow guide part is close to the direction of airflow flowing out of the fan assembly, the airflow can be prevented from violently colliding with the first flow guide part, and therefore noise generated by the airflow can be reduced. According to the ceiling fan, the first air guide part is arc-shaped, and the concave surface of the first air guide part is opposite to the fan assembly, so that the air outlet of the ceiling fan is more uniform, and the airflow can be blown to a farther distance.

The utility model provides a gas mixing device and semiconductor equipment, including: a gas mixing pipe and at least one gas guide pipe, the gas guide pipe is arranged on the side wall of the gas mixing pipe and extends into the gas mixing pipe, the gas guide pipe located in the gas mixing pipe is provided with at least one gas outlet hole, and the orientation of the gas outlet hole is consistent with the flow direction of carrier gas in the gas mixing pipe. The gas mixing device is simple in structure, low in manufacturing cost and convenient for pipeline modification and maintenance. Besides, different process gases are respectively conveyed to the gas mixing pipe through the plurality of gas guide pipes, the process gases can be sprayed out along the flowing direction of the carrier gas so as to be more stably blended into the carrier gas, the process gases and the carrier gas are fully and uniformly mixed through the laminar flow distribution assembly, and the mixing pipe effectively reduces the pressure difference by increasing the through-flow sectional area and reducing the flow speed, so that the gas mixing efficiency is improved. And the carrier gas and the process special gas are stably and uniformly mixed.

The invention relates to a lithium iron phosphate battery SOC error correction method and an error correction module, and belongs to the technical field of battery management, and the method comprises the following steps: 1, calculating an SOC error in real time; step 2, judging whether an error of SOC calculation is greater than 5% of a standard value, if so, entering step 3, and otherwise, returning to step 1; step 3, entering calibration charging, judging whether small slope calibration is carried out on the SOC, if so, entering step 4, and if not, entering step 5; step 4, performing small slope calibration by SOC, and then entering step 7; 5, judging whether full charge calibration is carried out or not, if so, entering a step 6, and otherwise, returning to the step 3; 6, the SOC performs full charge calibration and then enters the step 7; and 7, exiting the calibration charging, resetting the accumulated SOC error, and returning to the step 1. The SOC error is calculated in real time, whether small slope correction or full charge correction is carried out or not is judged, and the accumulated error is reduced or eliminated to a certain degree.

The utility model relates to the technical field of cyclone separators, in particular to a slug flow self-adaptive axial flow type gas-liquid cyclone separator which comprises a reducing outer cylinder, a vertical inner cylinder, a guide impeller, a horizontal inlet pipe and a side line guide pipe. One end of the vertical inner cylinder is connected with the bottom of the variable-diameter outer cylinder, and the other end of the vertical inner cylinder is connected with the horizontal inlet pipe through a right-angle bent pipe; one end of the lateral line conduit is connected with the horizontal inlet pipe, and the other end of the lateral line conduit is connected with the variable-diameter outer cylinder; and a flow guide impeller is arranged in the vertical inner cylinder. According to the utility model, gas with pressure is transferred into the variable-diameter outer cylinder by adopting the side line guide pipe, so that the pressure in the cylinder body is increased to a certain extent, the pressure difference between the cylinder body and the horizontal inlet pipe is reduced, slug flow is prevented from being formed from an inlet, and gas and liquid can enter the separator in a small-slug flow or mixed flow state. The slug flow can be weakened or even eliminated without external intervention, so that the separation performance of the axial flow type gas-liquid separator under a complex flow pattern is improved.

The invention relates to the technical field of valves, in particular to a hard sealing leakage-proof needle valve which comprises a valve seat and a valve element, a mounting cavity is formed in the valve seat, a first sealing face is arranged on the inner wall of the mounting cavity and is in a conical surface shape, a liquid inlet and a liquid outlet are formed in the two sides of the valve seat and communicate with the mounting cavity, and the liquid inlet and the liquid outlet communicate with the valve element. The valve element is slidably arranged in the mounting cavity. The first sealing part, the second sealing part, the middle connecting part and the valve seat are arranged, the first cavity is located between the liquid inlet and the liquid outlet, and the pressure in the first cavity is smaller than the fluid pressure at the liquid inlet and larger than the fluid pressure at the liquid outlet, so that fluid at the liquid inlet is more difficult to flow into the liquid outlet through the first cavity, and the sealing effect is better. In addition, the first cavity is formed, so that the pressure difference borne by the sealing face of the valve element is reduced, the radial or axial stress in the valve element is correspondingly reduced, the problem of plastic deformation of the valve element can be effectively solved, and the sealing effect of the needle valve is improved.

The present application discloses a vibration reduction and noise reduction device for a fixed conical valve, which relates to the technical field of valves and is arranged on a fixed conical valve. The vibration reduction and noise reduction device includes a first air supply component and a plurality of second air supply components. An annular negative pressure zone is formed in the cavity on the side of the valve body close to the water outlet pipe; the first air supply component includes a plurality of air supply pipes, which are located on the outside of the guide cover, one end of which is fixedly connected to the peripheral side of the guide cover and communicated with the cavity, and can replenish gas to the position of the peripheral side of the valve body in the cavity; the second air supply component includes a plurality of air supply structures, one end of which passes through the water outlet pipe, passes through the interior of the water outlet pipe, is located in the negative pressure zone and communicates with the cavity. The present application can effectively weaken the cavitation phenomenon, thereby effectively reducing the impact of the cavitation phenomenon and reducing the vibration and noise caused by it.

The invention discloses a micromotor-driven distributed turbulent flow pumpless liquid cooling device for space thermal control. The micromotor-driven distributed turbulent flow pumpless liquid cooling device comprises a pipeline body and an impeller pump, the impeller pump comprises an impeller with the outer diameter being D and capable of actively rotating. When the impeller pump is used for overall heat dissipation of a single small-size electronic element, one impeller pump is arranged in the cooling flow channel at the position 0.5 D-1. 5D away from the upstream of the small-size electronic element; when the impeller pump is used for eliminating the hot spots of the large-size electronic element, one impeller pump is arranged in the cooling flow channel at the position 0.5 D-1. 5D away from the upstream of each hot spot to be eliminated. An external pump is removed, and the impeller pump is arranged in the cooling flow channel, so that on one hand, a cooling working medium is pumped, on the other hand, a turbulent flow effect is achieved on the cooling working medium, a boundary layer is broken, and the heat dissipation effect is improved. In addition, for a large-scale heat dissipation scene, a plurality of impeller pumps can be arranged in the cooling flow channel in an array mode, the impeller pumps can be placed at local hot spots in a targeted mode, targeted heat dissipation is achieved, and the heat dissipation efficiency and uniformity are further improved.

Embodiments of the present application disclose a UPS device protection method. The protection method comprises: acquiring a first bus voltage applied to a main inverter circuit; in response to the first bus voltage being less than or equal to a first voltage threshold, reducing an output current of the main inverter circuit; acquiring a second bus voltage applied to the main inverter circuit after current-limiting operation of the main inverter circuit; and in response to the second bus voltage being greater than or equal to a second voltage threshold, controlling the output current of the main inverter circuit to return to a normal current, the second voltage threshold being greater than the first voltage threshold. In the case of rapid drop of the first bus voltage of the UPS device, the embodiments of the present application can quickly limit the output current of the main inverter circuit to gradually increase the bus voltage applied to the main inverter circuit, reduce the voltage difference between the bus voltage and the battery voltage of the battery, avoid damage to the switching tube of the direct current conversion circuit, the power factor correction circuit or the main inverter circuit due to the large current, and further improve the working reliability and safety of the UPS device.

The present application relates to the internal combustion engine technical field, especially a kind of methanol injector.The throttle plate is arranged in the injector body, the throttle plate is provided with the first inverted cone hole and the second inverted cone hole that are communicated with each other, the ball is arranged in the first inverted cone hole, and the second inverted cone hole can be opened or closed, the first accommodating cavity is arranged between the one end of plunger and the throttle plate, the first accommodating cavity is communicated with the second inverted cone hole, the inlet is communicated with the first accommodating cavity, the outlet is communicated with the first inverted cone hole, one end of the alcohol nozzle cap is connected to the other end of the injector body, the needle valve is slidably arranged in the alcohol nozzle cap to open or close the alcohol injection port, the second accommodating cavity is communicated with the inlet, and the methanol acts on the pressure-bearing surface to open the alcohol injection port.The methanol injector sets throttle plate and sets the second inverted cone hole, realizes multistage pressure reduction, thereby reduces the pressure difference of fluid flowing into the first inverted cone hole, delays the cavitation damage of sealing surface and the area near sealing surface caused by methanol vaporization, and prolongs its service life.

The utility model discloses a headlamp height adjustment instruction voltage generation circuit, which comprises a high-frequency voltage input end, an instruction voltage output end, a first triode, a second triode and a voltage reduction circuit, and is characterized in that the positive electrode of the high-frequency voltage input end is connected to the base electrode of the first triode, and the negative electrode of the high-frequency voltage input end is grounded; the first triode is an NPN type triode, the emitter of the first triode is grounded, and the collector is connected to the base of the second triode through the divider resistor; the second triode is a PNP type triode, the emitter of the second triode is connected to the positive electrode of the instruction voltage output end, and the collector is grounded; the cathode of the instruction voltage output end is grounded; the step-down circuit is connected between the base electrode and the collector electrode of the second triode and is used for enabling the base electrode voltage not to be zero when the second triode is switched on, reducing the voltage difference between the base electrode and the emitter electrode and reducing the base electrode current of the second triode. According to the scheme, the output stability and consistency of the instruction voltage output end at high and low temperatures can be improved.

The present invention discloses an automatic adjustment device suitable for preventing ash blockage of a boiler air preheater under deep peak regulation. The main technical scheme adopted is: a guide adjustment device, which includes a first guide device and a second guide device. The first guide device includes a first guide contraction plate arranged on one side of an air preheater inlet flue, a first fixed guide plate arranged on one side of the air preheater inlet flue and located below the first guide contraction plate, and a first rotating actuator connected to the first guide contraction plate; the second guide device includes a second guide contraction plate arranged on the other side of the air preheater inlet flue and corresponding to the first guide contraction plate, a second fixed guide plate arranged on the other side of the air preheater inlet flue and corresponding to the first fixed guide plate, and a second rotating actuator connected to the second guide contraction plate; a control device, which is respectively connected to the first rotating actuator and the second rotating actuator.

The invention belongs to the field of battery equalization, and discloses a quasi-resonance equalization circuit based on bus LC and a control method, the quasi-resonance equalization circuit comprises n batteries, 2n MOSFET switch tubes, n-1 LC energy storage modules and a switch controller; the n batteries are connected in series; and the LC storage module comprises a balancing capacitor C and a resonant inductor L which are connected in series. According to the invention, the equalization of the series battery pack can be realized, the control is simple, the equalization of any battery to any battery is realized, the distribution condition of initial voltage does not need to be considered, and the time required from the beginning of equalization to the end of equalization is irrelevant to the position of each battery monomer; the equalization speed is irrelevant to the number of the series batteries, after equalization is finished, the voltage difference of the batteries is small, and the voltage tends to be consistent.

The energy-saving rapid shearing device of the electrode extruding machine comprises a shearing machine support, an upper sliding way and a lower sliding way are arranged on the shearing machine support, two cutter positioning plates are installed between the upper sliding way and the lower sliding way in a sliding mode, shearing cutters are fixedly installed on the cutter positioning plates, shearing blades are arranged on the shearing cutters, and the two shearing blades are matched in a shearing mode. Two driving hydraulic cylinders are installed on the two sides of the shearing machine support, connecting rods are fixedly installed at the output ends of the driving hydraulic cylinders, and the ends, away from the driving hydraulic cylinders, of the connecting rods are fixedly connected with the cutter positioning plate. The position of the energy storage mechanism is closer to the shearing cylinder than the original hydraulic oil tank, so that pressure loss can be better compensated, the shearing speed of the shearing machine is improved, the shearing time is shortened, the shearing section of an electrode green body is smooth, the product quality is improved, energy is effectively stored in a non-operation state, the production efficiency is improved, and the energy-saving effect is achieved.

A hollow fiber membrane module operating method according to the present invention comprises a step for performing cross-flow filtration by supplying untreated liquid to the outer surface side of a hollow fiber membrane. The ratio of the viscosity µf of the untreated liquid to the viscosity µp of a filtrate satisfies µf / µp≥1.5, while the flow velocity ratio between the flow velocity vf of the untreated liquid to the flow velocity vp of the filtrate satisfies 0.02≤vp / vf≤0.3.

The present application belongs to the technical field of mechanical transmission sealing, and particularly relates to a spiral sealing and magnetic fluid sealing composite structure and a high-speed rotor with the same. The present application utilizes the high-speed pumping backflow characteristic of the spiral sealing and the static zero leakage characteristic of the magnetic fluid sealing to complement each other, and realizes full working condition sealing from zero rotation speed to the highest rotation speed. When the gear box rotor is static or operates at low speed, the magnetic fluid sealing unit relies on the magnetic field to constrain the magnetic fluid to occupy the sealing gap, and realizes static sealing; when the gear box rotor reaches a certain rotation speed, the lubricating oil is pumped back to the inside of the box body in reverse through the back oil channel through the pumping action of the spiral groove of the spiral sealing, and dynamic sealing is realized; the spiral sealing bears most of the sealing pressure difference, so that the magnetic fluid sealing unit only bears very low pressure difference, thereby allowing the magnetic fluid sealing to still maintain a sealing form under high-speed rotation.

The embodiment of the present application relates to the technical field of aerosol generating device, and discloses an aerosol generating device, which comprises a liquid storage box assembly, an outer tube and an atomization assembly, the liquid storage box assembly is provided with a liquid injection hole, the outer tube is arranged in the liquid storage box assembly, the atomization assembly is arranged in the outer tube, the atomization assembly is used for atomizing liquid substrate to generate aerosol, the outer tube and the liquid storage box assembly jointly define a first liquid storage cavity, the outer tube and the atomization assembly define a second liquid storage cavity, the first liquid storage cavity is communicated with the liquid injection hole, one end of the outer tube close to the liquid injection hole is provided with a liquid guide hole, and the liquid guide hole is communicated with the first liquid storage cavity and the second liquid storage cavity. Through the above mode, when liquid is injected into the first liquid storage cavity through the liquid injection hole, the embodiment of the present application realizes the reduction of air bubbles and pressure difference in the first liquid storage cavity.

The invention relates to the technical field of battery manufacturing, in particular to an optimization method for the terminal voltage difference of a battery, and provides an optimization method for the terminal voltage difference of the battery, and the optimization method comprises the step of carrying out silicon-containing treatment on a negative electrode material to obtain optimization of a silicon-containing negative electrode material or optimization of carrying out diversified mixing treatment on a positive electrode material, by adopting any one of the optimization modes, the end voltage difference curve slope of the battery can be effectively reduced, the voltage difference between the battery cells at the discharge end is reduced, the overall performance of the battery is improved, and the service life of the battery is prolonged; and by adopting an optimization treatment method based on the original positive electrode material or negative electrode material, the matching success rate and matching inclusiveness can be increased, so that the overall performance and the service life of the battery are improved, the operation process is simple, the implementation is easy, complicated equipment and technical support are not needed, the production cost is reduced, and the production efficiency is improved. The production efficiency is improved.

The invention discloses an equalization control circuit and control method of a battery system, the battery system and a storage medium, the equalization control circuit comprises at least two equalization loops, the equalization loops are formed by connecting switch tubes, resistors and battery cells in series, and the equalization control circuit further comprises a battery management system BMS connected with the switch tubes and used for controlling on and off of the switch tubes, presetting an equalization opening voltage difference and an equalization closing voltage difference of the battery cell; the battery management system BMS is used for detecting the voltage difference of the battery cells in real time, and when the voltage difference of the battery cells is larger than the equalization starting voltage difference, the battery management system BMS controls the switch tube to be switched on, and the equalization loop is powered on to work; and when the voltage difference of the battery cells is smaller than the equalization closing voltage difference, the battery management system BMS controls the switch tube to be switched off, and the equalization loop is powered off and stops working. The voltage difference between the battery cells can be reduced, and the service life of the battery can be prolonged.

The invention relates to the technical field of air conditioner control, and discloses a multi-stage pressure difference rearranged air conditioner variable flow cold water system which comprises a water supply main pipe on a user side, a water return main pipe, at least one vertical pipe system, a variable frequency water pump, a microcontroller MCU and a control unit on a network side, and the vertical pipe systems are arranged between the water supply main pipe and the water return main pipe in parallel. The variable-frequency water pump is arranged at the input end of the water supply main pipe; the vertical pipe system and the variable frequency water pump are both in signal connection with the microcontroller MCU, and the microcontroller MCU is in signal connection with the control unit through the wireless communication module. The invention further provides a control method of the multi-stage pressure difference rearranged air conditioner variable flow cold water system. Dynamic hydraulic balance can be performed according to actual conditions through multi-stage pressure difference re-setting and cooling capacity adjustment to adapt to loads, the required flow is guaranteed, the pressure difference of an inlet and an outlet of a water pump is reduced as much as possible, and the energy saving amount of a water system is increased.

The present invention relates to a blowdown steam recovery system for a multi-pressure boiler. The present invention comprises a high-pressure steam drum, a medium-pressure steam drum, a low-pressure steam drum, a medium-pressure continuous expansion tank, a low-pressure continuous expansion tank, and a timed blowdown expansion tank. The high-pressure steam drum is connected to the medium-pressure continuous expansion tank through a high-pressure continuous blowdown pipeline. The medium-pressure continuous expansion tank is connected to the low-pressure continuous expansion tank through a first regulating valve and is connected to the medium-pressure steam drum through a first check valve. The medium-pressure steam drum is connected to the low-pressure continuous expansion tank through a medium-pressure continuous blowdown pipeline. The low-pressure continuous expansion tank is connected to the timed blowdown expansion tank through a second regulating valve and is connected to the low-pressure steam drum through a second check valve. The low-pressure steam drum is connected to the timed blowdown expansion tank through a low-pressure continuous blowdown pipeline. The present invention realizes step-by-step flash evaporation of the blowdown steam of the high-pressure steam drum in the medium-pressure continuous expansion tank and the low-pressure continuous expansion tank by adding a medium-pressure continuous expansion tank, thereby greatly improving the thermal efficiency of recovering and utilizing the blowdown steam.

An oil-water two-phase measuring device based on swirl shaping includes an oil-water swirl shaping device. The straight pipe section required by the invention is greatly shortened, the pressure difference is also greatly reduced, and it has excellent adaptability to the conditions of rotating flow and vortex. For two-phase fluid, the swirl device can rectify the complex two-phase fluid into a uniformly dispersed flow or annular flow state in the tube that is symmetrical about the axis, thereby making it easier to measure. Since only a simple swirl device is affected in the measurement of this method, this method and device are easier to standardize compared to other non-standard differential pressure flow meters.

The invention discloses an air conditioning unit and a control method thereof.The air conditioning unit comprises a compressor, an oil separator, a condenser and an evaporator which are sequentially connected, and the oil separator is connected with an oil return opening of the compressor through a lubricating oil outlet; the air conditioning unit further comprises an oil cooler, one end of the oil cooler is connected with a refrigerant outlet of the condenser, the other end of the oil cooler is connected with a refrigerant inlet of the condenser, and the oil cooler is arranged in the oil separator and used for cooling lubricating oil in the oil separator through a refrigerant of a condensation outlet of the condenser. One end of the heat recoverer is connected with the heat recovery water inlet, the other end of the heat recoverer is connected with the heat recovery water outlet, and the heat recoverer is arranged in the oil separator and used for absorbing heat in the oil separator to heat the heat recovery water. The problems that in the prior art, an oil separator, an oil cooler and a heat recoverer are designed in a split mode, the pressure difference of an oil supply pipeline is increased, and the heat recovery efficiency is low are solved, the oil return and unit operation reliability is improved, meanwhile, heat energy is saved, and the heat exchange efficiency is improved.

The application discloses a parallel circulating current suppression method and device of a fractional order inverter, electronic equipment and a storage medium, and comprises the following steps: establishing a mathematical model of a fractional order inverter comprising a fractional order inductor and a fractional order capacitor, constructing a voltage and current double control loop based on a fractional order controller based on the mathematical model, and tracking and controlling the output voltage and current of the parallel fractional order inverters, and suppressing the circulating current by power sharing of the parallel fractional order inverters through droop control and fractional order virtual impedance. On the one hand, the voltage and current double control loop based on the fractional order controller can track the output voltage of the inverter, improve the tracking effect of the output voltage, reduce the voltage difference between the inverters, and suppress the parallel circulating current. On the other hand, the droop control combined with the fractional order virtual impedance can improve the power distribution response speed of the fractional order inverter, improve the power distribution accuracy between the inverters, and improve the suppression effect of the parallel circulating current.

The invention discloses a gas reservoir sensitivity experimental evaluation method and device, and relates to the technical field of oil-gas field development. The device simulates the states of rock and fluid at the formation temperature; before and after the rock core is damaged, establishing water saturation consistent with the original water saturation of the stratum; a nitrogen test permeability is adopted to simulate reservoir seepage conditions; the core controls the pressure at the outlet end and simulates stratum seepage conditions; evaluating the damage degree of the rock core according to the change rate of the moving speed of the liquid film in the soap film flowmeter. The method solves the problems of salting-out crystallization of experimental fluid, inconsistency between reflected temperature and pressure and formation conditions, large liquid measurement permeability error, sensitivity of stress generated by experimental pressure difference and the like in the process of evaluating the sensitivity of the volcanic gas reservoir at present. According to the method, the stratum seepage conditions are fully simulated, the experimental core pressure and the permeability before and after gas logging sensitivity are controlled, the reservoir sensitivity evaluation of the volcanic gas reservoir is more accurate, and a basis is provided for reasonable development of the volcanic gas reservoir.

The invention provides a DC-DC conversion circuit and a power conversion circuit comprising the same. The DC-DC conversion circuit comprises a positive DC bus, a negative DC bus, a DC power supply and a DC conversion unit. Wherein a neutral line is arranged between the positive direct-current bus and the negative direct-current bus, and the negative electrode of the direct-current power supply is connected with the neutral line. The DC conversion unit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first inductor, two ends of the first switch tube are respectively connected with a positive DC bus and a first end of the first inductor, and two ends of the fourth switch tube are respectively connected with a second end of the first inductor and a positive electrode of a DC power supply; two ends of the second switch tube are respectively connected with the first end of the first inductor and the neutral line. Two ends of the third switch tube are respectively connected with the second end of the first inductor and the negative DC bus. The DC-DC conversion circuit is high in working efficiency and good in EMC (Electro Magnetic Compatibility) characteristic, can be used for a common battery parallel operation system of a single-battery UPS (Uninterrupted Power Supply), and only has one inductor, so that the cost and the space can be saved.

The present application relates to a level conversion circuit. The level conversion circuit of the present application includes: an input module; an isolation module; an output module, including at least one of the following: a third high-voltage transistor; a fourth high-voltage transistor; wherein the output module is used to implement at least one of the following when the first output terminal of the input module outputs a first low-bit signal: the source of the fourth high-voltage transistor obtains a high-voltage power supply signal, and the fourth high-voltage transistor is turned on under the control of an inverted input signal that is inverted to the input signal so that the second output terminal of the level conversion circuit connected to the drain of the fourth high-voltage transistor outputs a second output signal determined according to the high-voltage power supply signal; the substrate and source of the third high-voltage transistor respectively obtain a first voltage-limiting signal to reduce the voltage difference between the substrate and drain of the third high-voltage transistor. The present application can reduce tube leakage, prevent tube breakdown, and improve circuit reliability.

The application relates to the technical field of display devices, and discloses a display device, which comprises a back plate, the back plate being conductive, the back plate comprising a bottom plate; a first lamp strip, the first lamp strip being located on a first side of the bottom plate, the first lamp strip comprising a first circuit board, a driving unit and a first connector; wherein one side of the first circuit board, which is away from the bottom plate, is provided with a first grounding terminal, the driving unit is located on the side of the first circuit board, which is away from the bottom plate, a grounding end of the driving unit is electrically connected with the first grounding terminal, the first connector is connected with an end portion of the first circuit board, the first connector comprises a shell, the shell being conductive, the shell being in contact with the first grounding terminal, one side of the shell, which faces the bottom plate, is provided with a grounding portion, and the grounding portion is in contact with the bottom plate; a printed circuit board, the printed circuit board being located on a side of the bottom plate, which is away from the first lamp strip, the printed circuit board being provided with a second grounding terminal, and the second grounding terminal being electrically connected with the bottom plate. The display device can reduce costs and increase efficiency and is suitable for the design of a narrow lamp strip.

The invention discloses a display panel, pictures displayed by the display panel comprise a first display picture and a second display picture which are continuously displayed, and the display panel comprises a plurality of sub-pixels, a plurality of scanning lines, a plurality of data lines and a compensation module, the polarity of a first data voltage input to the sub-pixel by the data line in the display time period of the first display picture is opposite to the polarity of a second data voltage input to the sub-pixel by the data line in the display time period of the second display picture; the compensation module is electrically connected with one end of each data line, the compensation module is used for inputting a first compensation voltage to the sub-pixels in the blank period of the first display picture and inputting a second compensation voltage to the sub-pixels in the blank period of the second display picture, and the polarity of the first compensation voltage is the same as that of the first data voltage; the polarity of the second compensation voltage is the same as that of the second data voltage, the first compensation voltage is not zero, and the second compensation voltage is not zero, so that the problem of flicker of the display panel is relieved.