110results about How to "Reduce discharge current" patented technology

The invention provides a switching device of permanent magnet synchronous motor windings. The switching device has n sets of windings corresponding to n main loop units; and with the joint effort of (4n-4) switches, switching of series connection and parallel connection of the n sets of windings is realized. The switching device has the following characteristics: the cost of the switching system is lowered and reliability of the switching system is improved; the motor operation efficiency is improved, the speed regulation range of the motor is expanded, and the demand of the main loop capacity is reduced; the selection principle of the switching rotation speed is provided; and a switching strategy for reducing the transient impulse current during the switching process is also brought forward.

The invention belongs to the technical field of drive control over hybrid power vehicles, and particularly relates to a power control method based on a hybrid power source for hybrid power. According to the technical scheme, when a vehicle accelerates urgently, the high instantaneous power is provided according to the advantage that the specific power of a supercapacitor is high, the response characteristic of the hybrid power source can be improved, the magnitude of discharging currents of a battery can be reduced, and damage to the battery is reduced; when the deceleration of the vehicle is high, and the high braking power is needed, most of braking energy is absorbed through the supercapacitor, and the magnitude of charging currents for the battery is reduced; the recovery ratio of the braking energy can be increased, and the service life of the battery can be prolonged.

A powder spray coating discharge assembly (230, 260, 216, 228, 232) for connection to an electrostatic spray coating gun (210), the gun (210) having a gun body (212), means for connecting to a supply of coating powder and means for supplying a voltage (20) at first and second potentials respectively to first (292) and second electrical connections (294) each for connection to a respective one of a discharge electrode (232) and a counter electrode (260), the means for supplying the voltage (20) comprising: a variable voltage power supply (114) having an input connected to an electrical power source (110), an output connected to each of the first and second electrical connections (292, 294), a control circuit (128) for controlling the variable voltage power supply (20) and means (120) for sensing an output load, wherein the control circuit (128) is adapted to adjust the variable voltage power supply (20) to reduce the voltage and current in proportion to a sensed increase in load, or vice-versa.

The invention belongs to the technical field of automobile energy-saving equipment, and relates to a regenerative braking energy storage device for an electric automobile. An ultracapacitor module stores the regenerative braking feedback energy of the electric automobile and is connected in parallel with a storage battery to power an electric motor when the electric automobile starts and accelerates; an ultracapacitor charge-discharge controller is electrically connected with the ultracapacitor module, the storage battery and the driving controller respectively; the ultracapacitor charge-discharge controller is electrically communicated with the ultracapacitor module to control the charge-discharge process; and the driving controller is electrically communicated with the electric motor to achieve control operation of the electric motor. According to the invention, ultracapacitors store the regenerative braking feedback energy of the electric motor car to prevent adverse effects on the power supply of the electric automobile due to frequent charge and discharge, so as to achieve a long service life, and the ultracapacitors have high power density and good dynamic response.

The present invention provides a touch awakening fingerprint imaging module group and a touch awakening apparatus thereof. The fingerprint imaging module group comprises a protection layer, a protector connected to the protection layer, a sensing layer and a processing chip connected to the sensing layer. According to the present invention, human body static electricity is obtained by the protection layer and is discharged to a ground end by the protector connected to the protection layer. Induced charge formed on the sensing layer by a capacitor structure formed by the protection layer and the sensing layer can be effectively reduced, so that a discharge current from the sensing layer to the processing chip can be effectively reduced, thereby reducing possibility of damaging the processing chip by the discharge current and effectively protecting the processing chip.

The invention relates to a method for preventing an OPGW optical cable connected to a substation structure from being broken by lightning strokes. The method is characterized in that the method includes the following steps: (1) a down lead of the OPGW optical cable is laid along the substation structure and is fixed to the substation structure through a fixing cable clip with an insulating rubber pad, and it is guaranteed that the distance between the down lead of the OPGW optical cable and the substation structure is larger than 20mm; (2) the excessive portion on the lower portion of the down lead of the OPGW optical cable is wound on an excessive-cable frame, and the portion between the down lead of the OPGW optical cable and the substation frame is insulated; (3) the connection portion at the lower end of the down lead of the OPGW optical cable is connected with a metal-free optical cable through a connector box, and the connector box guarantees that the portion between the down lead of the OPGW optical cable and the structure is insulated; (4) the portion between the upper end of the down lead of the OPGW optical cable and the upper end of the substation structure is connected with a first grounded wire, and the portion between the middle of the down lead of the OPGW optical cable and the middle of the substation structure is connected with a second grounded wire. According to the method, it is guaranteed that currents can smoothly flow through an OPGW and be grounded on short-circuited situations or during lightning strokes, and the OPGW cannot be burnt out, namely, the OPGW is not broken.

The invention provides a current transformer polarity tester. The tester comprises a power circuit for supplying power, at least one group of primary return circuits electrically connected with a primary coil of a current transformer, at least one group of secondary return circuits electrically connected with a secondary coil of the current transformer and a CPU circuit used for collecting and processing information and displaying a test result. The power circuit is respectively and electrically connected with each group of primary return circuits, each group of secondary return circuits and the CPU circuit, each group of secondary return circuits are respectively in signal connection with the CPU circuit, and the number of the primary return circuit is the same as that of the secondary return circuits. The tester is high in test accuracy and test efficiency, convenient to carry and convenient and rapid to use. Lithium batteries are adopted in the tester for power supply, and meanwhile the tester can test the polarity of at least more than one group of transformer bushing current transformers. Compared with a traditional tester, the tester shortens polarity test time greatly, and therefore the work test efficiency is improved and popularization of the tester is facilitated.

The invention provides a gas detection method which comprises the steps of using at least two gas sensors to constitute an array; setting inter-electrode voltage of the gas sensors to be lower than breakdown voltage, to make the sensors in non-self-sustaining discharge state; selecting detection starting voltage and ending voltage, selecting 2<k> detection voltage points at equal interval in the voltage range, recording the discharge current values of the m-th sensor at each detection voltage point, dividing the discharge current values by the discharge voltage values to obtain electric conductivity of to-be-measured gas, to obtain anode and cathode sensor detection data sets; selecting a data coupling coefficient to couple detection data of all gas sensors into one set; fitting the 2<k> discrete points in the detection data set into a detection electric conductivity curve by spline interpolation algorithm; inputting the curve into a tuning stochastic resonance system, and calculating signal-to-noise ratio curve; comparing the maximum value of the signal-to-noise ratio curve with a preset signal-to-noise ratio characteristic value, to determine concentration or type of the to-be-measured gas.

The invention belongs to the technical field of air disinfection purification, in particular to a purifier with a metal band-plate structure reactor. The purifier comprises a plasma reactor, a pulse power source, a blower assembly, a controller, an air inlet, an air outlet and a shell, wherein the positive electrode of the reactor is made of a plurality of antioxidant metal bands, while the negative electrode thereof is made of surface oxidized aluminum plates, two sides of the reactor are coated by nanometer TiO2, and two ends of the positive electrode are respectively fixed on the concave top end on a corresponding conductive rail; and an oscillator, an error amplifier, a PWM comparer and a switching tube are arranged in the pulse generator; and the switching tube is set by a single-ended flyback inverter. The purifier has the advantages of uniform corona discharge, high strength of generated plasma and free radical, good reliability and long working service life, solves the defects and prejudice in the prior art, and can be applied to air disinfection purification for clean rooms of factories, operating rooms of hospitals, office buildings, conference rooms, theaters, trains, automobiles, metros, vessels and other public places and household.

The invention provides winding design aimed at a winding switching device of a permanent magnet synchronous motor. The device is provided with n sets of windings, corresponding to n main circuit units, and through combined action of (4n-4) switches, series-parallel connection switching of the n sets of windings is realized. A winding method of double-layer lap winding and short-distance distribution is used in the windings. A stator slot of the permanent magnet synchronous motor is embedded with two sets of windings, and the two sets of windings are placed side by side. The winding design is characterized by reducing cost of the switching system, improving reliability of the switching system, improving operation efficiency of a motor, expanding speed regulating range of a motor, and reducing requirement of capacity of the main circuit, providing a selecting principle of rotation speed switchover, and providing a switching strategy for reducing transient pulse current in the switching process.

The invention provides a method for low-power radiation dose rate detection and wide-range scaling graduation. The working mode of a GM counting tube is controlled by use of a timing sequence so as to eliminate the dead time of the GM counting tube in hardware and reduce the discharge power consumption of the GM counting tube; a voltage conversion unit is controlled to work intermittently so that the no-load consumption of the system can be reduced under the premise of guaranteeing correct detection; a backward voltage is applied to reduce the consumption of quenching bodies and the damage to an anode wire in the discharge process of the GM counting tube; device graduation can be realized by use of a polynomial interpolation method. The method for low-power radiation dose rate detection and wide-range scaling graduation is capable of realizing hardware dead time correction and has the potential of prolonging the service life of the GM counting tube; after the graduation of the dose rate detection device and the determination of each scale coefficient ai,k (k=m, m-1, ..., 1, 0) in a formula (1), the influence of an unknown error on the measurement result can be reduced and a relatively accurate dose rate can be obtained at last.

The invention relates to a multi-stage constant-voltage charging method for a secondary battery and a discharging method for the secondary battery. The charging and the discharging methods respectively adopt the shallow charging mode and the shallow discharging mode and reduce the charging current and the discharging current at the early stage and the late stage of charging and discharging, thereby reducing the impact of non-uniform distribution of current density among parallel-connected monomer batteries or in the battery on the performances of the battery, and further improving the performances of the battery. Particularly, the multi-stage constant-voltage charging method for the secondary battery can realize the multi-stage constant-voltage charging by judging the charging current and the charging time and changing the charging voltage according to the judgment result. The charging method can effectively improve the impact of the non-uniform current density distribution among the parallel-connected monomer batteries or in the battery on the performances of the battery and improve the performances of the monomer batteries or a battery pack under the situation of having little impact on the total charging time.

The invention relates to an air duct type electronic air purification machine, belonging to the field of air sterilization and purification technologies. The air purification machine comprises a plasma reactor, a pulse power source, an air inlet and an air outlet. A positive electrode and a negative electrode are arranged in the plasma reactor, wherein the positive electrode is made of an oxidation resisting metal strap, the negative electrode is made of an aluminum plate or a stainless steel plate, and both faces of the negative electrode are coated with TiO2. A micro discharge preventing conductor rail made of an aluminum bar or a stainless steel bar is also arranged, and both ends of the positive electrode are fixed on relative positions on the micro discharge preventing conductor rail. The air purification machine can kill bacteria and viruses, degrade organic compounds and remove particulate pollutants, the produced plasma has high concentration, ozone and oxynitride have low concentration without secondary pollution, and the sterilization effect is doubled. Moreover, the invention has the advantages of simple structure, energy saving, high reliability and long service life. The air purification machine is installed in an air duct of a central air-conditioning system and used for the air sterilization and purification of places such as hospitals, clean rooms, office buildings, shopping malls, hotels, theatres, airports, subways, and the like.

The invention provides an isolating membrane for a Li-ion battery and the thickness d, the porosity Rho r and the aperture Rho s thereof respectively meet the following conditions: d is more than or equal to 5 microns and less than or equal to 50 microns, Rho r is more than or equal to 15 percent and less than or equal to 35 percent, and Rho s is more than or equal to 0.05 micron and less than or equal to 0.08 micron. The isolating membrane for the Li-ion battery has smaller porosity and aperture. When the Li-ion battery is fully charged and the short circuit happens, the isolating membrane is capable of reducing the discharging current and decreasing the continuous discharge capacity of the battery, thus controlling the magnitude of the short circuit current and the continuous time of the current and improving the safety; and when the battery is overcharged, has high temperature, or suffers improper use such as poking of a nail, squeezing and the like, the isolating membrane can rapidly shut off a micropore at fusion temperature, cut off an ion path, cause the Li to stop migrating from the anode to the cathode so as to stop the lattice collapse of anode materials and the oxidation of an electrolytic solution, thus protecting a battery cell from burning or exploding.

An electronic apparatus having charging function in which a secondary cell does not discharge even if the electronic apparatus operates during charging. When an external power input terminal (2) of the electronic apparatus is connected to an external power source, charging current flows to the secondary cell via a diode (3), switching means (4), and current detection means (5) and the secondary cell is charged. Control means (8) monitors the charging current and turns OFF the switch means (4) when the secondary cell (1) is fully charged and the charging current has become below a predetermined value. When the switch means turns OFF, the external power source is electrically disconnected from the secondary cell (1) and discharging of the secondary cell is prevented. When the external power source remains connected, the external power is supplied to a load (7) and the control means (8) via a regulator (6). In this case also, the secondary cell does not discharge and the fully charged state can be maintained.

The invention relates to a -48V direct current single system double-power-source storage battery contact device and a switching method thereof. The -48V direct current single system double-power-source storage battery contact device comprises storage batteries, two ways of power sources and a monitoring unit, wherein the storage batteries are divided into a first storage battery pack and a second storage battery pack, the first storage battery pack is connected with the second storage battery pack through a battery bus coupler switch, the battery bus coupler switch comprises a switching air switch, an electrical operation mechanism is arranged on the switching air switch, and the electrical operation mechanism is connected with the monitoring unit. The structure of the -48V direct current single system double-power-source storage battery contact device is characterized in that the relation between the two battery packs are automatically controlled in real time by using a system state obtained by monitoring of the monitoring unit, and thus the two battery packs can be maintained in the optimal states all the time.

The invention provides a computer power supply control method and device. The method comprises the following steps of: acquiring power supply information of a computer in a normal working state, wherein the power supply information comprises battery power supply and external power supply; Obtaining a discharge current or a battery temperature of the battery power supply when the power supply information is supplied to the battery power supply, and controlling the central control unit to operate at a first working frequency or a second working frequency according to the discharge current or thebattery temperature; When the power supply information is supplied to an external power supply, controlling the central control unit to operate at a first operating frequency. The invention can adjust the working frequency of the central control unit according to the discharge current of the battery power supply or the battery temperature, so that the computer system can be operated stably for along time under special circumstances, and the important data loss or damage caused by the sudden power failure of the computer system can be avoided.

The invention relates to a multistage constant-voltage charging method. In the charging method, a shallow charging mode is adopted, and charging and discharging currents are decreased at the initial stage and the final stage of charging and discharging so as to lower the influence of uneven current density distribution among parallel monomer batteries or inside the batteries on battery performances, therefore, the battery performance is improved. Particularly, in the multistage constant-voltage charging method of the lithium secondary battery, the multistage constant-voltage charging is realized by judging the charging current and charging time and changing the charging voltage according to a judging result. The charging method can be used for effectively lowering the influence of the uneven current density distribution among the parallel monomer batteries or inside the batteries on the battery performances under the condition that the total charging time is not influenced greatly, thereby improving the performances of the monomer batteries or a battery pack.

The invention discloses a flameproof lithium battery starting power source for coal mine. The flameproof lithium battery starting power source comprises a power supply circuit, a power management circuit, a control room circuit, a charge-discharge protection circuit, a charging circuit and a starting circuit. A lithium battery management unit is arranged in the power management circuit; an intermediate relay and a direct-current contactor are arranged in the charge-discharge protection circuit; the lithium battery management unit is capable of realizing detection and warning on the voltage, the temperature and the current of an individual battery; when the charging of a lithium battery pack is finished, the lithium battery management unit automatically controls the intermediate relay to switch off, and consequently, direct-current contact is stopped and the charging of the lithium battery pack is ended; in case of abnormal use of the lithium battery pack, the lithium battery management unit controls the intermediate relay to switch off, and consequently, the direct-current contact is stopped and the charging and discharging of the lithium battery pack are ended, and therefore, the lithium battery pack can be protected. In addition, the lithium battery management unit can be powered by a charger by use of a first diode and a second diode when the lithium battery pack is completely drained.

The invention discloses a preparation method of refractory tungsten carbide WC+W2C spherical powder. The method comprises the steps that a tungsten carbide bar is preheated; the heated tungsten carbide bar is pushed into a length cutting support, and a rotating disc is used for acting on the length cutting support so that high-speed rotation of the tungsten carbide bar can be achieved; meanwhile, the tungsten carbide bar is pushed to move inside an atomization room through a bar moving mechanism; a plasma gun is used for emitting plasma jet to the end face of the tungsten carbide bar, the high-speed rotation tungsten carbide bar is atomized into molten drops in the atomization room, meanwhile, under the effect of surface tension of the scattered molten drops, and cooling is performed to obtain tungsten carbide powder through cooling mixing gas; finally, a powder collection room is used for separating the tungsten carbide spherical powder from the cooling mixing gas. In the atomization process, the anti-crack capacity of the rotating bar is improved; due to the fact that the bar is alternately heated before atomization, and the high temperature resistance material is made into the length cutting support, the powder dispersion and granularity distribution stability can be improved, and the number of non-spherical granules is decreased.