70results about How to "Guaranteed voltage" patented technology

A method for reducing power consumption of a processor is disclosed comprising steps of applying time-frequency transformation to a plurality of load values of the processor to obtain the feature sampling cycle of the processor, and adjusting the voltage/frequency of the processor based on said feature sampling cycle. With the method of the present invention, the processor load value in next time interval can be accurately predicted, and thus the voltage/frequency of the processor in the next time interval can be adjusted on the basis of the load value.

The invention provides a shifting register unit, a shifting register, an array substrate and a display device. The shifting register unit is characterized by comprises a sampling unit, an output unit and a reset unit, wherein the sampling unit is connected with the sampling signal input end and the first clock signal input end, the output unit is connected with the output end, a first power supply, a third power supply and the second clock signal input end, the reset unit is connected with the first clock signal input end and a second power supply, the sampling unit is used for sampling input signals of the sampling signal input end under the control of the first clock signal input end and transmitting the obtain sampling signals to the output unit, the output unit is used for outputting the sampling signals to the output end of the sampling unit under the control of the second clock signal input end, and the reset unit is used for sending reset control signals to the output unit to reset under the control of the first clock signal input end.

The present invention provides a configuration method of main reactive compensation capacitor group of transformer substation. The configuration method is characterized by the following steps: first, arranging the capacitance ratio of capacitors according to the optimum capacitance ratio of the capacitors; secondly, the reactive compensation capacitance required by the main transformer of the transformer substation is directly multiplied by the corresponding coefficient in Table 2, to acquire the capacitance of the group of capacitors. The formula of optimum indexes in Formula I is adopted to optimize the configuration of the main reactive compensation capacitor group of transformer substation. The configuration method solves the technical problem that the improper configuration of the main reactive compensation capacitor group of transformer substation can not effectively complete the reaction compensation, leads to the equipment waste, and has no function of maintaining the voltage and reducing the net loss.

The invention discloses a method for charging a mobile phone under a low temperature. The method comprises the following steps: step S100, inserting a mobile phone charger; step S200, detecting whether a battery voltage is lower than 2.9V, executing step S300 if the battery voltage is lower than 2.9V, and executing step S500 if not; step S300, starting a pre-charging process; step S400, stopping the pre-charging process when a detected battery voltage reaches 3.2V; step S500, starting a power-on process; step S600, starting a charging circuit to provide the battery with a charging current pulse; step S700, detecting whether the battery voltage is higher than 2.9V when the power-on process is finished, executing step S800 if the battery voltage is higher than 2.9V, and executing step S300 if not; step S800, starting a constant heavy-current charging process. When a mobile phone battery is over-discharged, the battery can not be fully charged under a low-temperature. With the method provided by the invention, the problem can be solved.

The invention provides an MMC-based full-power variable-speed pumped storage system in the field of power distribution. The system comprises a generator stator, a full-power converter, a transformer and a power grid, which are connected successively in series via an alternating current cable. The full-power converter comprises a grid side converter and a generator side converter, which are connected in series via an alternating current capacitor and employ an MMC topology structure. For a full-power variable-speed pumped storage power station, the generator side converter can change rotating speed to increase the operating efficiency and the adjusting range of a pump turbine and the grid side converter can realize active power and reactive power rapid control, so that the pumped storage power station can maintain power grid voltage and frequency stability under the circumstances of load fluctuation and various kinds of power supply change. With the MMC topology structure, grid connection of full-power variable-speed pumped storage units can be realized and the content of harmonic generated by power electronic devices can be effectively reduced while improving the quality of electric energy of power grids; the trigger frequency of a single part is low, so that the service life of each part can be prolonged.

The invention discloses a highly-efficient inverter fractional order voltage and frequency control method under a microgrid off-grid mode. A mechanism modeling method and abc/dq coordinate transformation are employed to establish a state space model of an inverter in dq coordinates under the microgrid off-grid mode. Droop control, fractional order voltage PI control and fractional order current PI control are employed as voltage and frequency control method. The weighted values of two performance indexes including an integral value of the product of a voltage offset absolute value and time and the integral value of the product frequency offset absolute value and time serve as fitness functions. A colony evolution method based on adaptive variation operation is designed to optimize and set parameters of a fractional order controller, and optimized control signals generated after coordinate transformation are transmitted to a space vector pulse width modulation module, thereby realizing optimized operation of an inverter under the microgrid off-grid mode. Optimized voltage and frequency control effects under complex conditions and the microgrid off-grid mode can be realized.

The invention discloses a portable electronic plug gauge, and relates to a measuring instrument. The electronic plug gauge is provided with a shell capable of shielding external signals, one end of the shell is connected with a measuring head, a sensor is arranged in the measuring head body, a signal processor is arranged in the shell, a display is arranged on the shell, an output signal of the sensor is input into the signal processor to be processed, and the processed signal is output and then displayed by the display. Because a measuring and displaying integrated module is designed, the electronic plug gauge has a simple structure and is convenient to carry and use; and because the whole system adopts a transformer circuit and booster circuit module with switching function, on the one hand, the steady working voltage of the whole system is ensured, and on the other hand, the system can enter a power saving mode better under the condition that the gauge is not used for long time so as to furthest improve the service life of the gauge.

The present invention discloses a smart grid fractional electrical spring that does not require non-critical loads. The smart grid fractional electrical spring includes a voltage sampler, a controller, and an order-adjustable fractional impedance; the controller is connected with a voltage sampler and a fractional impedance; and the voltage sampler is connected to two ends of a critical load in parallel. The controller generates a corresponding control signal according to the grid voltage signal collected by the voltage sampler to control the order of the fractional impedance. The invention can be directly connected to the two ends of the critical load in parallel, does not need to be equipped with non-critical loads, is flexible and convenient to use, ensures the stability of the criticalload voltage, and avoids the influence of the grid fluctuation on the critical load.

The invention relates to the technical field of logistics transmission, and particularly relates to a logistics mailing system and a control method based on radio frequency and positioning technology. A technical method of a logistics goods additionally provided with a GPS positioning module is adopted, the technical problem that a user can not accurately know the goods position can be solved, and the technical effect of accurately positioning the logistics goods position is achieved. A radio frequency IC card technical method is adopted, the technical problems that manual writing of express information is troublesome and electronic identification is not easy are solved, and the technical effects that the IC card directly contains the express information and can be used repeatedly can be achieved. A single chip microcomputer control technology is adopted for design, and the technical effects that the control mode is simple and direct, and the transmission mode is convenient and quick are achieved. A method of GPRS technology and Bluetooth technology is adopted, the technical problem that a delivery person-used control device has a single function is solved, and the technical effects that the delivery person can use the control device to be directly connected with a user mobile device to acquire the logistics information and to be connected with the GPRS network to transmit information are achieved.

The invention discloses a charging method for batteries, a charging unit and an electronic device. The charging method comprises the following steps: the battery voltage is detected, when the battery voltage is an over-discharge voltage, floating charging is conducted on the battery, when the battery voltage is a normal service voltage, constant-current charging is conducted on the battery, whether the battery voltage drops or not is judged in the constant-current charge process, if the battery voltage drops in the constant-current charge process, the battery charging is stopped, if the battery voltage does not drop and the battery voltage reaches a voltage threshold value in the constant-current charge process, after the voltage remains unchanged for a set duration, whether the battery voltage drops or not is judged, if the battery voltage does not drop, the constant-voltage charging is conducted on the battery, and if the battery voltage drops, the battery charging is topped. According to the charging method of the invention mode of execution, different charging ways are chosen for battery charging according to the voltage and therefore it is guaranteed that the battery achieves the real full-charge conditions and the battery does not heat in the process of battery charge by using constant-voltage charge.

The invention discloses a fine design method for a voltage and current transmission ratio of a high-frequency transformer. The method comprises the steps of A, building a voltage and current transmission function of the high-frequency transformer, and acquiring transmission characteristic resonant property; B, proposing design constraint of the transmission ratio of the high-frequency transformer; and C, achieving design of the transmission ratio of the high-frequency transformer. By the method, the voltage and current transmission ratio of the high-frequency transformer can be approximate to a turn ratio of a winding, so that expected voltage and current conversion of the high-frequency transformer is enabled to be achieved, and the method has certain guidance significance to optimal design of the high-frequency transformer.

The present invention discloses a hybrid direct current converter. The converter is formed by connecting a high-frequency resonance converter and a dual-active bridge converter in parallel, the high-frequency resonance converter and the dual-active bridge converter are connected from the head to the tail, and the high-frequency resonance converter includes a full-bridge inverter A, a high-frequency transformer and an uncontrolled rectifier bridge; the full-bridge inverter A and the uncontrolled rectifier bridge are respectively connected with the head and the tail ends of the high-frequency transformer; the dual-active bridge direct current converter includes a full-bridge inverter B, a medium frequency transformer and a fully-controlled thyristor rectifier; and the full-bridge inverter B and the fully-controlled thyristor rectifier are respectively connected with the head and the tail ends of the medium frequency transformer. The hybrid direct current converter combines the advantages of the high-frequency resonance converter and the dual-active direct current bridge converter, the current ability of the high-frequency resonant capacitor is considered, the high-frequency resonant capacitor can only bear the effect of the clamping terminal voltage, and the large-power electric power transmission completely depends on the dual-active bridge converter, and therefore, the stability and the power transmission power of the terminal voltage is ensured, and the integral closed loop PI control strategy is employed by the converter.

The invention discloses a manufacturing method for a light emitting diode. The manufacturing method comprises the following technological steps of providing a substrate, performing epitaxial growth of a light emitting epitaxial layer which is formed by an N type semiconductor layer, a light emitting layer and a P type semiconductor layer in a stacking manner, and defining the upper surface of the light emitting epitaxial layer into a P type region and an N type region; forming a metal film layer on the light emitting epitaxial layer; performing quick annealing treatment to enable the metal film layer to be subjected to sphere agglomeration to form metal particles; forming a mask layer on the light emitting epitaxial layer and the metal particles, and performing patterning on the mask layer to expose the N type region; taking the metal particles and the mask layer as a mask structure, performing an etching process to etch the N type region until the N type semiconductor layer is exposed, and performing roughening on the upper surface of the N type semiconductor layer; and removing the mask layer, reserving the metal particles on the P type semiconductor layer, and carrying out chip processing.

The invention relates to a bus terminal accessory of an ethylene-propylene insulation copper pipe, and belongs to the technical field of power equipment. The accessory comprises a hollow insulation pipe and semiconduction stress cones, wherein the semiconduction stress cones are arranged at one end of the insulation pipe and are in hollow truncated cone shapes, one end with a large radius of each semiconduction stress cone faces the insulation pipe, the semiconduction stress cones are wrapped by the insulation pipe, and a plurality of umbrella skirts are arranged on an outer surface of the insulation pipe. In the bus terminal accessory of the ethylene-propylene insulation copper pipe, provided by the invention, a liquid silicone rubber material is adopted, the accessory is formed by die pressing high-temperature curing, the semiconduction stress cones are overlapped with the insulation pipe to achieve an effect of uniform insulation shielding, and the radial field intensity and longitudinal field intensity of an insulation shielding opening can be perfectly uniform; the insulation layer is provided with umbrella skirts, the insulation problem of a voltage of a semiconduction outer side can be ensured very well by the insulation layer, and meanwhile, the voltage problem of the whole bus terminal is ensured; and the umbrella skirts are used for extending the creepage distance of a high potential and a low potential very well, and the subsequent process of a bus due to the creepage distance problem is saved.

The invention relates to a high-voltage current-limiting device based on current-limiting zinc oxide FR, which includes a current-limiting zinc oxide FR, a high-voltage quick-blow fuse FU, a high-speed eddy current switch K0, a discharge damper RL, and a first isolation switch G1, a second The isolation switch G2 and the third isolation switch G3, the discharge damper RL and the high-speed eddy current switch K0 are connected in series at both ends of the current-limiting zinc oxide FR, and the high-voltage fast-blow fuse FU is connected in parallel at the two ends of the current-limiting zinc oxide FR. terminal, the incoming line end of the current-limiting zinc oxide FR is connected to the incoming line end AL1 of the high-voltage current limiting device through the first isolation knife switch G1, and the outgoing line end of the current-limiting zinc oxide FR is connected to the high-voltage current limiting device through the second isolation knife switch G2 Outgoing terminal AL2. The invention can quickly put into the current-limiting zinc oxide FR, through which the intensity of the short-circuit current can be effectively limited, and the impact of the short-circuit current on electrical equipment can be greatly reduced. While ensuring the voltage of the user terminal, the current-limiting oxidation can be realized Zero loss of zinc FR.

The invention relates to an electrode material of an alkaline battery. The electrode material comprises an anode, a cathode, a separation plate located between the anode and the cathode, an alkaline electrolyte, an anode current collector and gel; the cathode comprises the following cathodic active materials: manganese dioxide, nickel oxyhydroxide and conductive carbon particles; and the anode comprises zinc or zinc alloy, and graphite.

The invention discloses a technology for forming oxidation films with consistent thickness. The technology comprises the following steps: (1) uniformly spot-welding a sintered tantalum anode block on a conductive metal bar; (2) placing a bracket with the conductive metal bar in an electrolytic cell; (3) manufacturing a lead frame in a shape of a Chinese character 'wang'; (4) placing the lead frame in the shape of the Chinese character 'wang' on the bracket in a superposed manner and compactly contacting with the metal bar spot-welded with the tantalum anode block; (5) connecting the anode of a power supply to the central position of the lead frame in the shape of the Chinese character Wang, and connecting the cathode of the power supply to the electrolytic cell; and (6) connecting the power supply for medium film forming treatment. The technology provided by the invention has the beneficial effects that the lead frame is manufactured by using a lead, so that the voltage difference between the output end of the power supply and the metal anode block of a valve is effectively reduced, the voltage applied to the anode block is guaranteed, and meanwhile, a current is applied from a terminal of a center shaft of the lead frame in the shape of the Chinese character 'wang', so that the paths of the current flowing to all directions are same, the electric field intensity is uniform, and the consistency of thickness of the generated oxidation films is guaranteed.