46results about How to "Control voltage" patented technology

The invention relates to a non-isolated three-port DC-DC converter and a method for using the same. The converter is applied to a photovoltaic battery/battery/DC microgrid, and is provided with three ports of a photovoltaic battery PV, a battery BT, and a direct current bus DC. It includes two boost circuits and a buck-boost circuit, a boost circuit is used to connect the photovoltaic cell and the DC bus, a boost circuit is used to connect the photovoltaic cell PV and the battery BT, and a boost-boost circuit is used to connect the battery BT and DC bus DC; the specific circuit composition is: the positive pole of the photovoltaic cell PV is connected to the inductance L ₁ After that, three branches are drawn, the first branch is connected to the switch tube S ₁ The drain of the switch tube S ₁ The source of the ground is grounded; the second branch is connected to the diode D ₁ the anode of the diode D ₁ The negative pole is connected to the DC bus DC; the third branch is connected to the diode D ₂ the anode of the diode D ₂ The negative pole of the switch is connected to S ₄ The drain of the switch tube S ₄ The source of the battery is connected to the positive pole of the battery BT; the positive pole of the battery BT is connected in series with the inductance L at the same time ₂ Then lead out two branches, one branch is connected to the switch tube S ₂ the drain.

The invention relates to surface treatment of alloy materials and in particular to a surface treatment method of magnesium aluminum alloy. The experimental process comprises the following steps: polishing, degreasing, performing alkaline corrosion, performing chemical polishing, performing anodic oxidation, performing electrolytic coloring, and performing hole sealing. According to the surface treatment method, the design is reasonable, and a thick and dense oxide film layer is formed on the surface of the magnesium aluminum alloy by an anodic oxidation method, so that the corrosion resistance of the magnesium aluminum alloy is remarkably changed and the hardness, the wear resistance and the decorative performance of the magnesium aluminum alloy are improved; however, the anodic oxide film of the magnesium aluminum alloy is very high in porosity rate and adsorption capacity, can be easily polluted and corroded by a corrosive medium, and has to be subjected to hole sealing so as to improve the corrosion resistance and the pollution resistance and fix pigment bodies.

Provided is a three-phase bridge-type half-control rectification trigger circuit with the protection function. By means of the three-phase bridge-type half-control rectification trigger circuit with the protection function, pre-charging of a three-phase bridge-type half-control rectification circuit and regulation of a busbar voltage can be achieved. The three-phase bridge-type half-control rectification trigger circuit with the protection function mainly comprises a DSP controller, a Butterworth low-pass filtering circuit, a synchronous detection link device, a phase-shifting control chip and a drive circuit. It is achieved that the busbar voltage is regulated according to the duty ratio of PWM waves output by a DSP main control chip, and therefore the charging current of a capacitor is lowered during starting. Pre-charging of the three-phase bridge-type half-control rectification circuit is achieved, and the cost of a high-power inverter is lowered. Meanwhile, when the inverter operates, whether a three-phase incoming line current is an over-current and whether phase loss of a three-phase incoming line voltage occurs can be detected, a fault signal can be fed back to the DSP controller, and therefore safe operation of the inverter is guaranteed. The three-phase bridge-type half-control rectification trigger circuit with the protection function has the advantages of being flexible in control, good in charging effect, economical, practical, perfect in protection function and reliable in performance.

The invention discloses a driving method and circuit of an intelligent control lighting appliance. Intelligent control of a lamp fixture is driven without using a driving IC chip, driving signals are directly output through the I/O port of a single-chip microcomputer for adjusting the conduction time of MOS tubes of voltage reduction circuits so as to realize control of current or voltage of a load, accordingly, the color temperature and the brightness of the lamp fixture are controlled, the adjustment precision is high, feedback signals are adjusted and fed back also through the single-chip microcomputer so as to realize stable output at a load end, the color temperature and the brightness of the lamp fixture can also be adjusted through a wireless control scheme, the circuit is simple, the cost is low, the size is small, the installation is convenient, and the application prospect is good.

The invention discloses a transparent display device, relating to the field of display, and capable of improving transmittance of the transparent display device. The transparent display device comprises an upper substrate, a lower substrate and a colour H-PDLC (holographic polymerdispersed liquid crystal) layer, wherein the upper substrate sequentially comprises a transparent electrode and an alignment film from top to bottom, the lower substrate sequentially comprises the transparent electrode and the alignment film from top to bottom, and the colour H-PDLC layer is arranged between the upper substrate and the lower substrate.

The invention discloses a motor driver and a stator direct current excitation motor system. The motor driver includes a plurality of phase bridge arms and one neutral point bridge arm, wherein one phase bridge arm, the neutral point and one phase winding of the driven motor form a current loop; through control of the conduction direction and the conduction time of the phase bridge arm, the voltage at the winding end being adjacent to the phase bridge arm and the voltage duration time are controlled; through control of the conduction direction and the conduction time of the neutral point bridge arm, the voltage at the winding end being adjacent to the neutral point bridge arm end and the voltage duration time are controlled, so that control of the voltage magnitude and the voltage time at two ends of the winding can be realized and control of the current magnitude and the current direction at two ends of the winding can be realized; and as the neutral point bridge arm is used as a common bridge arm, N-1 bridge arms are reduced and furthermore 4N-4 switch elements are reduced, so that the cost of the driver is greatly reduced and the power density is improved.

The invention provides a control method and system of a microwave oven. The control method comprises the following steps: when receiving an instruction for starting the microwave oven, detecting the cavity body temperature of the microwave oven in real time; controlling the voltage transmitted to the heating pipe of the microwave oven according to the cavity body temperature to control the cavity body temperature in a process of controlling the heating pipe to continuously work. According to the technical scheme, the heating pipe in the microwave oven can be guaranteed to continuously work, so that food can be continuously heated and the mouth feel and surface coloring effect of the food are improved; meanwhile, the influence on the food cooking effect due to relatively high cavity body temperature fluctuation caused by discontinuous operation of the heating pipe can be avoided.

The invention relates to a general formula compound shown as a formula (I) in description, wherein Ar1 is selected from C4-C40 substituted or unsubstituted heterocyclic aromatic hydrocarbons groups, and C8-C30 substituted or unsubstituted thick heterocyclic aromatic hydrocarbon groups; L1 is selected from single bonds, C6-C30 substituted or unsubstituted aromatic hydrocarbon groups or C6-C30 substituted or unsubstituted condensed ring aromatic hydrocarbon groups; substituent groups on the Ar1 and the L1 are independently selected from C1-C30alkyl or naphthenic base, alkenyl and C1-C6 alkoxy orthioalkoxy, or are independently selected from single ring or condensed ring aryls containing 4 to 60 ring carbon atoms, single ring or condensed ring aryl containing heteroatoms selected from N, O,S and Si and having 4 to 60 ring carbon atoms. The invention also relates to an organic electroluminescence device using the general formula compound, and the device has high current efficiency and low driving voltage.

The invention discloses a preparation method of a three-dimensional framework polymer-based high-dielectric composite material based on a core-shell structure, and relates to the technical field of high-dielectric composite materials. The preparation method comprises the following steps: pretreatment of foamed nickel, preparation of foamed nickel/barium titanate, and preparation of the polymer-based high-dielectric composite material, wherein the polymer-based high-dielectric composite material is divided into three kinds, namely, foamed nickel/barium titanate/epoxy resin, a nickel oxide/barium titanate/epoxy resin composite material and a nickel oxide (nickel)/barium titanate/epoxy resin composite material. According to the prepared polymer-based high-dielectric composite material, a dielectric constant up to 8000 can be obtained under the condition that the loss is lower than 0.1, the dielectric constant and the loss can be conveniently changed by adjusting the electrophoretic deposition amount, the sintering temperature and the oxidation temperature, and the preparation method of the polymer-based high-dielectric composite material has the advantages of being simple, easy to operate, high in applicability and practicability and the like.

The invention relates to a semi-active fuzzy control method, and aims at solving the existing problems that the selection of parameters of a control system is difficult and parameter optimization is not comprehensive of fuzzy control in semi-active control based on a magnetorheological damper. The invention provides the semi-active control algorithm which combines and improves a crow searching algorithm and the fuzzy control, seismic response is taken as the input of improving a fuzzy controller, and therefore the fuzzy controller is allowed to directly output control signal. The comprehensiveoptimization of key modules of the fuzzy control system is achieved on the basis that an original crow algorithm is improved. The method has the advantages that a voltage signal of the magnetorheological damper can be accurately controlled to achieve the full shock-absorbing performance of the magnetorheological damper so that the vibration of a building structure under seismic excitation can besignificantly inhibited, and the seismic response can still be effectively reduced when a seismic wave and structural parameters change.

A radio frequency IC includes a PLL circuit and prevents a PLL loop from being easily unlocked upon fluctuation of VCO oscillation frequencies due to a change in temperature. The PLL loop includes a VCO capable of switching oscillation frequency bands, a variable frequency divider, a phase comparison circuit, and a loop filter. A switching switch can apply one of plural predetermined set voltages to the VCO in place of a voltage of the loop filter in an open state in which the loop filter is disconnected from the VCO. The radio frequency IC als has a decision circuit that decides whether the phase of output of the variable frequency divider is ahead of or lags behind that of a reference signal of a predetermined frequency, and an automatic band switching circuit that generates a signal for switching VCO frequency bands, based on output of the decision circuit.

An inverter circuit, coupled to a two-level DC voltage supply and being able to form a five-level output voltage is described, together with a method for operating the inverter circuit. The inverter circuit comprises a series connection of six unidirectional power semiconductor switches, each coupled to an antiparallel diode, between the positive and negative nodes of the supplying DC voltage. Theinverter circuit further comprises a series connection of two internal capacitors between the cathodes of the first and the fifth switches of the series connection, the connection point of the capacitors being coupled to the internal node of the inverter circuit. In use, the unidirectional power semiconductor switches are controlled in order to set the voltage of the output of the inverter circuit.

The invention provides a pixel driving circuit and a driving method thereof as well as a display device and belongs to the technical field of display. By means of the pixel driving circuit and the driving method thereof as well as the display device, the resolution of the display device can be increased, and the problem of poor vertical Mura is solved. The circuit comprises a driving transistor, a storage capacitor, a light emitting element, a first control module and a second control module, wherein a first control end and a second control end of the first control module are connected with a first impulse signal terminal and a second impulse signal terminal, a first input end is connected with a power supply signal terminal and a source of the driving transistor, a second input end is connected with an initial signal terminal, third and fourth input ends are connected with a data line and a drain of the driving transistor, a first output end is connected with a first pole plate of the storage capacitor, and a second output end is connected with a second pole plate and a grid of the driving transistor; a control end of the second control module is connected with a third impulse signal terminal, a first input end is connected with a first or second impulse signal terminal, a second input end is connected with the drain of the driving transistor, a first output end is connected with the first pole plate, and a second output end is connected with the light emitting element. The pixel driving circuit is used for increasing the resolution.

The invention discloses a compensation method and system for the voltage drop of an output cable of an airplane ground static variable power supply and belongs to the technical field of airplane ground static variable power supplies. The compensation method comprises steps that S1, a standby control wire core of the output cable and a main loop wire core of the output cable are made to be connected in parallel and pressed at a plug where the output cable is connected with an airplane; S2, the standby control wire core is connected to an aircraft ground static variable power supply, and the standby control wire core is taken as a voltage acquisition wire of a main control chip in the aircraft ground static variable power supply; S3, the main control chip takes the voltage value collected by the standby control wire core as an output voltage negative feedback value, PID closed-loop control is carried out on the output voltage negative feedback value and an output voltage set value until the deviation between the output voltage negative feedback value and the output voltage set value is smaller than a threshold value, voltage drop compensation of an output cable is achieved, and purposes of simplifying voltage compensation estimation, and controlling the output voltage can be realized in real time.

A high voltage power supply (HVPS) with digital control and method thereof is provided, which includes a transformer for inducing a voltage using the interaction of primary and secondary side coils and an input voltage, switching elements for controlling a voltage induced in the secondary side coil by intermittently conducting a current in the primary side coil of the transformer, digital control units for controlling the intermittent switching of the switching elements in response to control data being input, and an adjusting unit for absorbing and removing a transient voltage of the reverse direction impressed through the primary side coil of the transformer. Transient voltage is absorbed and removed by a snubber circuit connected to the transformer. As a result, the withstand voltage of the switching element controlling the voltage of the transformer is minimized and heat generation of an incorporated single-chip ASIC is also minimized.

The invention provides an electronic tag and an electronic tag-based power management method and apparatus. The electronic tag comprises an electronic tag chip, a power management module and a load, wherein the electronic tag chip is used for instructing a load to execute an instruction received by the electronic tag chip; the power management module is connected with the electronic tag chip and used for controlling a voltage of the load; and the load is connected with the power management module and used for executing the instruction received by the electronic tag chip according to the instruction of the electronic tag chip. Through the electronic tag and the power management method and apparatus, the problem that the voltage of the load in the electronic tag cannot be controlled in related technologies is solved; and the control on the voltage of the load in the electronic tag is realized.

The utility model relates to the technical field of software engineering equipment and particularly relates to an anti-misplug plug and socket for software engineering equipment. The anti-misplug plugcomprises a plug, wherein a resistor is fixedly connected to the inner wall of the plug, a negative plate is fixedly connected to the inner wall of the plug and close to the bottom of the resistor, and a rotating shaft is fixedly connected to the middle of the plug; an inner wall of the top of the rotating shaft is fixedly connected with a positive plate, and the inner wall of the bottom of the rotating shaft is provided with a piston groove movably connected with a piston block. According to the mis-unplugging prevention plug for the software engineering equipment, through the cooperative use of the electromagnet and the magnetic conductive block, when the plug and the socket are plugged, the electromagnet is in a power-on state, and viscosity of magnetorheological fluid in the piston groove is increased under the magnetic action, so movement of the piston block is severely blocked, and the electromagnet and the magnetic conductive block attract each other at the moment; and the rotation of the transmission teeth is effectively limited, so the effect of preventing the plug from being pulled out by mistake is achieved, and the stability of power equipment is improved.

The invention provides a semi-direct-drive direct-current wind generating set and a control method and device thereof. The control method comprises the steps that when the semi-direct-drive direct-current wind generating set operates in a maximum power point tracking MPPT mode, the reference output voltage of the reactive power compensation device is determined; the output voltage of the reactivepower compensation device is controlled with the determined reference output voltage of the reactive power compensation device as the target so as to adjust the voltage at the connection point, and the input end of a generator of the semi-direct-drive direct-current wind generating set is connected to a gear box; the output end of the generator is connected to the primary side of the machine-sidetransformer and the reactive power compensation device through the connecting points, and the secondary side of the machine-side transformer is connected to the output end of the semi-direct-drive direct-current wind generating set through the rectifier and the high-voltage switch device in sequence.

The invention provides a capacitor and a switch power supply AC-DC circuit , which are applied to a high voltage-resistant circuit. The capacitor comprises a silicon substrate, a first insulation layer, a metal conductive layer and a base plate of an arbitrary lead frame in the high-voltage resistant circuit, wherein one surface of the silicon substrate covers the fist insulation layer, the metal conductive layer covers the first insulation layer, the other surface of the silicon substrate is connected with the base plate, and the thickness of the first insulation layer is determined according to a voltage-resistant impact value of the capacitor and the dielectric strength of the first insulation layer. With the capacitor provided by the embodiment of the invention, the miniature requirement of the circuit can be met.