165results about How to "Reduce the current value" patented technology

The invention provides a lithium ion battery positive current collector high in safety performance, a preparing method thereof and a lithium ion battery. The positive current collector comprises an aluminum layer and a porous anodic alumina resistive layer which covers the surface of the aluminum layer. The thickness of the porous anodic alumina resistive layer is 10-100 nm. The porous structure of the porous anodic alumina resistive layer is a blind hole structure. The diameter of blind holes is 0.01-5 microns. The porous anodic alumina resistive layer can effectively increase the resistance of the positive current collector so that the current value generated when a short circuit happens to the battery can be lowered, and accordingly the temperature is decreased when the short circuit happens to the battery and the dangers of firing and exploding caused by heat generated by the battery is avoided. In addition, the adhesive strength of the positive current collector and positive active substances can be improved through the blind hole structure of the positive current collector, so that the probability of falling of the positive active substances during charging and discharging is lowered, and accordingly the cycle life of the lithium ion battery is prolonged.

The invention relates to an energy-saving environmental-protection type abrasion resistant canned hydrocarbon refrigerant, which comprises propane and isobutane. The energy-saving environmentally-protective abrasion resistant canned hydrocarbon refrigerant is characterized in that the energy-saving environmentally-protective abrasion resistant canned hydrocarbon refrigerant further comprises low temperature refrigeration lubricating oil; the propane accounts for 54 to 65 percent; the isobutane accounts for 30 to 40 percent, and the low temperature refrigeration lubricating oil accounts for 3 to 8 percent. The hydrocarbon refrigerant is prepared by mixing mixed alkane with certain proportion and the low-temperature refrigeration lubricating oil in proper amount, thus effectively solving the problem of the prior hydrocarbon refrigerant that a compressor is abraded frequently and a cylinder bore is scuffed frequently due to the characteristics of being too dry and excellent oil solubility, The hydrocarbon refrigerant with mixed alkane disclosed by the invention belongs to natural working fluid, is free of fluorine without influence on warming-up of the global climate. Compared with R12 and R134a, the freezing point is lower; the latent heat of vaporization is larger; the specific energy of constant entropy compression is smaller so that the compressor works more easily. The flowing property is better; the delivery pressure is lower; the load of the compressor is lower; fuel consumption is reduced and the energy-saving rate can reach 10 percent to 20 percent when the air conditioners are running.

PROBLEM TO BE SOLVED: To provide a cylinder-shaped secondary battery, capable of easily connecting a current collector plate to a sealing plate and reducing internal resistance, and to provide a manufacturing method of the same.SOLUTION: The cylinder-shaped secondary battery is constituted by storing an electrode body 2, impregnated with nonaqueous electrolyte in a battery can 10 formed by fixing a sealing plate 4 to the opening of a bottomed cylindrical body 11. A pair of electrodes 21, 22 are made to protrude at both end parts of the electrode body 2, disc-shaped first and second current collector plates 31, 32 are connected to the end part of both electrodes 21, 22 respectively; and the surface of the second current collector plate 32 is resistance-welded to a bottom face of the bottomed cylindrical body 11. A plate-shaped projection piece 33, extending from the surface of the first current collector plate 31 toward the sealing plate 4 is protrusively arranged on the first current collector plate. A slit 41, into which the protrusion piece 33 is to be inserted, is opened at a position corresponding to the position of the protrusion piece 33, and laser welding is applied to a part where the projection piece 33 is fitted to the slit 41.

The present invention provides a brake control device for an elevator, which is provided with a brake control part (20) that energizes a first brake coil and a second brake coil (5a,5b) for performing energization and cutoff control for semiconductor switches (11a,11b) so one part of a period of energizing the first brake coil is overlapped with one part of a period of energizing the second brake coil. After energization and cutoff is started, motion start of each brake sheet (17a,17b) is determined according to the detection result which is detected by a current detector (25). Along with the determination, the energization and shutoff control is performed for the semiconductor switch so the current value of each brake coil is smaller than that in determination.

The invention provides a precharge control circuit for a high-voltage system of a hybrid electric vehicle. The precharge control circuit for the high-voltage system of the hybrid electric vehicle comprises a power battery pack, a main positive relay, a main negative relay, a precharge relay, a capacitor and a motor; one end of the main positive relay and one end of the main negative relay are correspondingly connected to the positive electrode and the negative electrode of the power battery pack, and the other end of the main positive relay and the other end of the main negative relay are connected with the motor; the capacitor is connected to both ends of the motor in parallel; the precharge relay is connected with a precharge resistor in series and then connected to both ends of the main positive relay to form a parallel circuit; and a shunt is arranged between the parallel circuit and the positive electrode of the power battery pack. Meanwhile, a precharge control method using the precharge control circuit is provided. According to the precharge control circuit and the control method for the high voltage system of the hybrid electric vehicle, through the current value collected by the shunt and the current slope value in the interval time, whether precharging of the high voltage system is completed or not is judged, the method is simple, the high voltage part does not need to be introduced into a BMS, and the safety is high.

A method and a device for controlling a fuel metering system are described. The fuel metering system includes at least one injector for injecting fuel into an internal combustion engine. An electric current value is applied to the at least one injector, and a rail pressure value is determined based on the electric current value.

The invention discloses a base region gradient P<+>-N-N<+> type SiC ultrafast recovery diode manufactured on a 4H type single crystal silicon carbide epitaxial layer and a process. An anode/(P<+>)4H-nc-SiC/(N) slowly changes into a 6H-nc-SiC/(N)4H-c-SiC/(N<+>)4H-c-SiC/cathode. The base region gradient P<+>-N-N<+> type SiC ultrafast recovery diode comprises an N<+> type 4H-c-SiC substrate, an N type 4H-c-SiC epitaxial layer, an N type 6H-nc-SiC gradually-doped and grain-gradient multilayer film and a P<+> type 4H-c-SiC single layer film, wherein the outer sides of the N<+> type 4H-c-SiC substrate and the P<+> type 4H-c-SiC single layer film are in ohm connection with an anode NiAu and an anode TiAu respectively. The device structure is made by using a PECVD (Plasma Enhanced Chemical Vapor Deposition) technology. The process has the advantages of shortening the reverse recovery time, inhibiting surge current and lowering the process temperature.

When a brake pedal is slowly depressed, a brake ECU sets a target current iFL* of a pressure-increasing linear control valve for a front-left wheel to increase from a current value lower than a valve-opening current i open by a decrease set value i1, and sets a target current iFL* for a pressure-increasing linear control valve for a front-right wheel to increase from a current value lower than a valve-opening current i open by a decrease set value i2 (<i1). This prevents a timing at which the pressure-increasing linear control valve is closed and a timing at which the pressure-increasing linear control valve is closed from matching, whereby a variation in a vehicle deceleration G can be suppressed.

The invention provides an AC pulse arc welding control method, wherein during the negative electrode polarity-based period (Tbn), the negative electrode polarity-based current (Ibn) smaller than the critical value is electrified. During the negative electrode peak-based period (Tpn), the negative electrode peak-based current (Ipn) greater than the negative electrode polarity-based current is electrified. During the positive electrode peak-based period (Tp), the positive electrode peak-based current (Ip) greater than the critical value is electrified. During the positive electrode polarity-based period (Tb), the positive electrode polarity-based current (Ib) smaller than the critical value is electrified. Therefore, the welding can be performed. The positive electrode polarity-based current (Ib) is inclined to be smaller along the passing of time. The front half part of the positive electrode polarity-based current (Ib) is capable of increasing so as to inhibit the disappearing of electric arc. The rear half part of the positive electrode polarity-based current (Ib) is capable of decreasing so as to reduce the sputtering of electric arc.

A master servo motor and a slave servo motor that synchronously drive for rotation a master main spindle provided with a center that supports one end of a work piece and a slave main spindle provided with a center that supports the other end of the work piece are included. Before grinding, a slip detection cycle that detects a limit current value for the servo motors, at which the work piece and the centers slip, is executed and, during grinding, a grinding condition is changed to prevent a slip between the work piece and the centers in advance at the time when any one of current values of the servo motors has reached a slip threshold value set on the basis of the limit current value.

The invention discloses a device and method for in-situ remediation of fluoride-polluted soil, which can adopt a permeable reactive barrier in combination with an electrodynamics technology to performin-situ remediation on fluoride-polluted soil. The remediation method comprises the steps of performing physicochemical property measurement on soil, performing fluorine elution on the surface of thesoil using a soil eluent, laying an electrode capable of being repaired in situ, constructing an electrolyte continuous cycle loop between an electrolysis chamber and an electrolyte storage tank of the in situ electrode, and applying a direct-current electric field between the anode and cathode with a low-pressure pulsed power supply. Fluorinion carrying negative charge moves towards an anode chamber through electromigration under the action of the electric field and is adsorbed by a permeable reactive barrier in the anode chamber, meanwhile, fluorine, in the form of fluoride or other solubleions, moves towards a cathode chamber through electrodialysis and is adsorbed by a permeable reactive barrier in the cathode chamber, after the remediation is completed, the electrode is taken out, thereby completing the removal and remediation of fluorine pollutants in the soil.

The invention discloses a saturated iron core type fault current limiter, comprising a four-column type iron core, two sets of DC windings, and one set of AC winding. The two sets of DC windings are in series connection, and are connected to a DC power source, and respectively wind around the two core columns at the middle of the four-column type iron core, and the magnetic field directions generated by the two sets of DC windings in the iron core are of the same. The AC winding is in series connection between the AC power supply and a load RL. The AC winding winds around the outer side of the DC winding in a manner that the middle two core columns are used as the winding shaft. The saturated iron core type fault current limiter is advantageous in that the structure is simple; short circuit current can be effectively restricted; power consumption is little and heat radiation is good.

The invention discloses piano paint piece edge polishing equipment. An edge in the advancing direction of a piano paint piece is a straight edge; and an edge on the horizontal surface vertical to the straight edge is a transverse edge. The polishing equipment comprises a transverse edge polishing machine and a straight edge polishing machine which are sequentially arranged, wherein in the transverse edge polishing machine, two transverse edges of the piano paint piece are provided with at least one polishing wheel respectively; in the straight edge polishing machine, two vertical edges on thepiano paint piece are provided with at least one polishing wheel respectively; each polishing wheel is individually connected and driven through one motor; each motor is provided with a current sensor; all current sensors on the transverse edge are connected to a transverse edge programmable logic controller (PLC); all current sensors on the straight edge are connected to a straight edge PLC; andeach polishing wheel and the motor connected with the polishing wheel are arranged on one feeding fine turning mechanism. The invention also provides a polishing method for the piano paint piece edgepolishing equipment. By the equipment and the method, automatic intelligent polishing can be realized.

The invention belongs to electronic circuit technologies, and particularly relates to a sectional temperature compensation circuit which comprises a constant-current module, an over-temperature trigger module and a current source module with positive temperature coefficients. Constant currents can flow through load under the effect of the constant-current module; the over-temperature trigger module is connected with the current source module with the positive temperature coefficients, the current source module with the positive temperature coefficients can be switched on under the control of the over-temperature trigger module, and currents of the current source module with the positive temperature coefficients are controlled by the over-temperature trigger module; an output end of the current source module is connected with an inverted input end of the constant-current module, and compensation currents can be outputted from the output end of the current source module. The sectional temperature compensation circuit has the advantages that voltages of input power sources of chips can rise, the temperatures of the chips can be increased, the chips cannot be immediately switched off, voltages on a resistor Rs are linearly reduced, current values are decreased, and accordingly power consumption and the temperatures of the chips can be further reduced; the different temperature coefficients are adopted in different temperature ranges, accordingly, the temperature application ranges of the chips can be expanded, and the load and devices can be effectively protected.

The invention relates to a cloth cutting device of hole stitching machines, wherein period time is not lost and right pressing force is easily to be set.The cloth cutting device (30) comprises a knife (32), a knife receiver (31), a moving mechanism (35) which moves the knife (32) or the knife receiver (31), a pulse motor (34) which serves as a drive source of the movement of the knife or the knife receiver, a rotation amount detector (55) which detects a rotation amount of the pulse motor, and a controller (50) which controls the pulse motor.; The controller executes a control to switch the movement of the knife or the knife receiver to be low speed on its way, and includes a cutting control means (50c) which controls the pulse motor to stop driving if a deviation determining means determines that the deviation of the pulse motor reaches the set value, and a current control means (50c) which limits, during the low-speed movement, a current value applied to the pulse motor to be lower than that during a high-speed movement.

The invention discloses a power supply circuit which comprises an alternating current/direct current converting unit, an uninterruptible power supply, a protective circuit and a power supply unit. The alternating current/direct current converting unit is used for converting voltage of the uninterruptible power supply into direct voltage and providing a direct-current power supply for the power supply unit through the protective circuit. The protective circuit comprises a first resistance, a switch, a first capacitor and a microprocessor. The first terminal of the first resistance is connected with the alternating current/direct current converting unit. The second terminal of the first resistance is connected with the power supply unit and connected with ground through the first capacitor. The microprocessor is connected with the first terminal of the first resistance and the switch. At the initial time of power supplying of the uninterruptible power supply, the microprocessor controls the switch to be opened, and after preset delay time is used up, the microprocessor control the switch to be closed. The power supply circuit controls the switch to be closed and opened in delay time through the microprocessor, and damages caused by the fact that at the initial time of power supplying of the uninterruptible power supply, a surge current occurs can be avoided.

The invention discloses a 500KV transformer direct-current resistance and direct-current demagnetization intelligent test instrument comprising a rectifier circuit, a polarity-adjustable circuit, an inverter circuit, a constant current source module, a DSP control module, a standard sampling resistor, an AD data collector, a microprocessor used for controlling a display to display, and the display. The rectifier circuit, the polarity-adjustable circuit, the inverter circuit, the DSP control module and the constant current source module are connected sequentially. The standard sampling resistor is connected between the DSP control module and the constant current source module. The AD data collector, the microprocessor and the display are connected sequentially. The rectifier circuit is connected with the display. By adopting the instrument of the invention, single-phase and three-phase direct-current resistance test is realized, and the direct-current test time of transformer direct-current resistance test is shortened. Because the instrument is integrated with a direct-current demagnetization function, direct-current resistance test can be carried out at high current, and the test time can be shortened. Demagnetization is carried out in a timely manner after test, so that a large amount of detachment and installation time is saved, and the work efficiency is improved.

The invention discloses a method for inhibiting generation of internal defects of an aluminum alloy resistance spot welding nugget, and belongs to the technical field of resistance spot welding. A welding current is divided into an electrifying heating stage, a cooling stage and a pressure maintaining stage, wherein in the electrifying heating stage, the current amplitude of the welding current is15KA-60KA, and the electrifying time is 50ms-200ms; and in the cooling stage, the current is 0-15KA, and the cooling time is 2ms-40ms. According to the welding method, due to the existence of the cooling stage, welding heat input is stable, and internal stress of a welding spot is reduced, so that the generation of the defects such as cracks and air holes in the nugget is inhibited, and the effect of improving the strength of the welding spot is achieved.

The invention provides a charging method, a mobile terminal and a charger. The charging method comprises the steps of performing constant current charging on a battery of the mobile terminal; when thevoltage value of the battery of the mobile terminal reaches a preset voltage threshold value, and when it is detected that the current value of a charging current output by the charger is not loweredfrom a first current value to a second current value, controlling a communication signal transmitted between the mobile terminal and the charger to be in a low-level state; and after the first presettime frame, controlling the communication signal transmitted between the mobile terminal and the charger to be in a high-level state, and transmitting a first current lowering instruction to the charger. Therefore, by controlling the communication signal transmitted between the mobile terminal and the charger to be in the low-level state for a certain while, the charger can perform a reset communication access operation to further respond the first current lowering instruction transmitted by the mobile terminal, thereby lowering the current value of the charging current output by the charger,and lowering risk of battery damage of the mobile terminal.

The invention relates to a method for controlling an electromagnet connected in a self-protected DC circuit, which can be controlled to switch back and forth between two switching positions, and is used to actuate a locking object of a hydraulic valve, wherein by means of an electronic control device in the The coil of the electromagnet is fed with an excitation current under the suction state of the electromagnet armature, and a holding current smaller than the excitation current is fed to the coil of the electromagnet under the holding state of the armature. The present invention also relates to A device used to achieve a reduction in the holding current. According to the invention, the actual current in the coil is continuously measured after the electromagnet is controlled, and this current is evaluated for the movement of the armature. The method of the present invention is based on the one hand that the force of the electromagnetic movable part is proportional to the current flowing, and on the other hand that the movement of the movable part causes a reverse inductance in the magnetic coil, which reduces the measured actual current value in the coil. The movement of the armature is detected immediately at the beginning of the movement or shortly thereafter, so that energy regulation can be carried out in an optimal manner, preferably by reducing the current to the clamping current value by means of pulse width modulation.

The invention discloses a rotor and a servo motor. The rotor comprises a rotating shaft and a magnet ring, the magnet ring sleeves at the magnet ring position of the rotating shaft, an axial limit device is arranged at the magnet ring position and limits the magnet ring to axially move on the rotating shaft, and a circumferential limit structure is arranged on the opposite surface of the magnet ring and the magnet ring position and limits the magnet ring to rotate on the rotating shaft. According to the rotor, the magnet ring is fixed on the rotating shaft through the axial limit device and the circumferential limit structure, glue is omitted, failure of the glue is avoided, the magnet ring still cannot move or fly off even if the surface temperature of the rotating shaft rises after the motor bears load or overload for a long time, and reliability of the motor is improved.

The invention discloses an LED dimming drive circuit and a switching power supply. The LED dimming drive circuit comprises a power switch tube cut-off time control circuit, a power switch tube conduction time control circuit and a power switch tube drive circuit. When a dimming voltage of the dimmer is higher, it indicates that the brightness of an LED load needing to be adjusted is larger, that is, the value of the current output to the LED load by the switching power supply is larger, the working frequency corresponding to a critical conduction mode can meet the LED dimming brightness requirement at the moment, so the LED dimming drive circuit works in the critical conduction mode when the dimming voltage is larger. When the dimming voltage is lower and a deep dimming mode is required, the working frequency corresponding to the critical conduction mode cannot meet the LED dimming brightness requirement at the moment, so the LED dimming drive circuit works in an intermittent working mode capable of further reducing the working frequency, the current value of the LED load is further reduced, the dimming depth of the LED load is increased, and the dimming precision of the LED load is improved.