74results about How to "Small voltage change" patented technology

A semiconductor device includes a boosting circuit for supplying a power supply voltage during a standby state of the semiconductor device. The boosting circuit includes a charge pump circuit and first and second detection circuits for detecting an output voltage of the charge pump circuit. The second detection circuit is operated by a DC current greater than that of the first detection circuit, and is activated by an output (Vdet1) from the first detection circuit. The charge pump circuit is activated based on at least an output (Vdet2) from the second detection circuit.

For a predetermined period from the start of a read operation, an electric current is fed to bit lines connected with memory cells so that ferroelectric capacitors of the memory cells are charged. The voltage change of the bit lines are different according to the logic values of data stored in the ferroelectric capacitors. Therefore, the logic value stored in the memory cells can be detected as a time difference. Even if the voltage change of the bit lines is small, the time difference can be reliably generated. Even in case the residual dielectric polarization value of the ferroelectric capacitor is low, therefore, the data can be reliably read from the memory cells. In short, the read margin of data can be better improved than in the case where the logic value of data is detected with a voltage difference.

A method for controlling dynamic response of switch power is based on a closed-loop control system including a sampling module, a dynamic control module, an error calculating module, a PID module, a mode control module and a PWM module, wherein the sampling module samples output voltage Vo, and the dynamic control module compares the Vo with set Vo max, Vo min and V ref. Whether a dynamic mode is employed is determined. When the output voltage Vo changes greatly under the dynamic mode, the voltage Vo is rapidly restored to a stable voltage by inputting large power or small power, and the load is detected by voltage change gradient to determine the working state and reduce voltage resonance. The dynamic response effect is improved.

A band-gap circuit is constituted by comprising a feedback control amplifier 31 and MOS transistors 32 and 35, having two transistors 33 and 34 of which emitter area is different, comprising resistors R1, R2 and Rp between a base and an emitter of the transistor 33 of which emitter area is smaller, having the resistor Rp between the base and a collector and comprising the resistors R1 and R2 between the base and emitter of the transistor 34 of which emitter area is larger. It is possible to provide the band-gap circuit operable at a low supply voltage and having high PSRR, low noise and few variations.

A resistive random access memory device, a method for manufacturing the resistive random access memory device, and a method for operating the resistive random access memory device are disclosed. The resistive random access memory device includes a resistive switching memory element including two electrodes and a layer of variable-resistance material between the two electrodes, wherein the layer of variable-resistance material exhibits bipolar resistive switching behavior; and a Schottky diode including a metal layer and a p-doped semiconductor layer which contact each other, wherein the metal layer of the Schottky diode is coupled to one of the two electrodes of the resistive switching memory element. The present disclosure provides the resistive random access memory device operating in bipolar resistive switching scheme.

A cable (100) for powering of radio equipment (110) mounted on a mast for carrying the radio equipment (110) is disclosed. The cable (100) comprises a first conductor (C) for feeding a current to the radio equipment (110), a return and shielding conductor (R, G) for feeding a return current from the radio equipment (110) and for shielding of the first conductor (C), and an insulating material (l1) disposed between the first conductor (C) and the return and shielding conductor (R, G). The first conductor (C) is at least partially enclosed by the insulating material (I1). A first cross-sectional area of the first conductor (C) is less than a second cross-sectional area of the return and shielding conductor (R, G).

A band-gap circuit is constituted by comprising a feedback control amplifier 31 and MOS transistors 32 and 35, having two transistors 33 and 34 of which emitter area is different, comprising resistors R1, R2 and Rp between a base and an emitter of the transistor 33 of which emitter area is smaller, having the resistor Rp between the base and a collector and comprising the resistors R1 and R2 between the base and emitter of the transistor 34 of which emitter area is larger. It is possible to provide the band-gap circuit operable at a low supply voltage and having high PSRR, low noise and few variations.

The invention relates to a liquid crystal display device and a driving method thereof. The liquid crystal display device comprises a time sequence control circuit, a scanning driving circuit, a data driving circuit and a liquid crystal display panel, and the liquid crystal display panel comprises multiple pixels. The time sequence control circuit comprises a data analysis module, wherein the data analysis module is used for receiving and analyzing every frame of image data; in n lines of the pixels which are displayed continuously in one frame of the image data, when m lines of pixels which are displayed continuously display a black picture (n>=4, n>m>=2), the data analysis module outputs a first polarity inversion control signal to the data driving circuit, the data driving circuit is used for processing a data signal according to the first polarity inversion control signal so as to generate a plurality of gray scale voltages and the gray scale voltages are provided to the liquid crystal display panel; and when the plurality of pixels of the liquid crystal display panel display the frame of image, in the m lines of the pixels, which are displayed continuously and display the black picture, the polarities of all the pixels positioned in the same line are the same.

The invention discloses a phase-locked loop resistant to a single particle transient state. The phase-locked loop comprises a phase frequency detector, a charge pump, a filter, a voltage-controlled oscillator and a frequency divider. A single particle suppression circuit is arranged between the charge pump and the filter and comprises a charge discharge branch, decay resistor, and a charge compensation branch. One end of the damping resistor is connected with an output end of the charge pump, and the other end of the damping resistor is connected with an input end of the voltage-controlled oscillator. When voltage of the output end of the charge pump is reduced and charging is needed, the filter charges the output end of the charge pump through the single particle suppression circuit. When the voltage of the output end of the charge pump rises and discharging is needed, the output end of the charge pump charges the filter through the single particle suppression circuit. Due to the fact that the single particle suppression circuit is arranged between the charge pump and the filter of the phase-locked loop, when receiving single particle bombardment, the output end of the charge pump discharges or be charged so as to reduce voltage disturbance caused on the input end of the voltage-controlled oscillator.

An LED driving apparatus converts AC input power into predetermined DC output power and supplies the DC output power to an LED load. The LED driving apparatus includes a switching element Q1 to be turned on and off, a ripple current reducer 3a that is connected in series with the LED load and reduces current ripples of the LED load, and a controller CNT that turns on and off the switching element according to a feedback voltage taken from a connection point of the LED load and ripple current reducer, thereby controlling the DC output power to a predetermined value.

For a predetermined period from the start of a read operation, an electric current is fed to bit lines connected with memory cells so that ferroelectric capacitors of the memory cells are charged. The voltage change of the bit lines are different according to the logic values of data stored in the ferroelectric capacitors. Therefore, the logic value stored in the memory cells can be detected as a time difference. Even if the voltage change of the bit lines is small, the time difference can be reliably generated. Even in case the residual dielectric polarization value of the ferroelectric capacitor is low, therefore, the data can be reliably read from the memory cells. In short, the read margin of data can be better improved than in the case where the logic value of data is detected with a voltage difference.

The invention discloses an inverting control system and method based on grid drop testing in a photovoltaic power generation system. The method comprises the steps that a photovoltaic array converts solar energy into electric energy, a DC-DC converter carries out MPPT of the photovoltaic power generation system, and an inverter inverts direct current into high-quality alternating current to be sent to a grid; whether the grid drops or not is detected, and if the grid does not drop, an MPPT controller in a pre-controller works, and more energy is obtained from the photovoltaic array; if the grid drops, the MPPT controller in the pre-controller stops working, a first PI controller works, voltage of direct current bus keeps stable in the low-voltage ride through process, a grid-connected current feed unit provides reactive current, and the grid-connected current amplitude is kept constant. The inverting control system and method based on grid drop testing in the photovoltaic power generation system can reduce severe sudden changes of the voltage of the direct current bus in the low-voltage ride through process and prevent the grid-connected current from exceeding a flow value.

The invention relates to a no-load closing inrush current and overvoltage suppression unit of an ultrahigh-voltage transformer and belongs to the technical field of power electronics. The unit is applicable to no-load closing inrush current and overvoltage suppression for the ultrahigh-voltage transformer; inrush current and overvoltage generated in switching the transformer are decreased; meanwhile, less arc light occurs between contacts of a breaker; the service life of the transformer is prolonged; especially under the condition that ultrahigh-voltage grids both domestic and abroad fail to allow switching of the transformers, the importance of the unit upon operational safety and stability of the grids is more highlighted.

The invention provides an off-grid and grid-connected smooth switching method of a virtual synchronous generator. The smooth switching method is characterized by comprising grid-connected / off-grid and off-grid / grid-connected smooth switching. As for off-grid / grid-connected switching, the switching strategy is added in the off-grid and grid-connected switching process without modifying the control strategy of the virtual synchronous generator, and the reference voltage of the virtual synchronous generator is changed into the command reference voltage from the grid voltage and the correction angular velocity of pre-synchronous control is enabled to be zero directly so as to realize grid-connected / off-grid smooth switching. Popularization of the virtual synchronous generator technology is further facilitated in the field of new energy power generation, and friendly accessing of distributed energy resources can be realized so as to enhance the stability of the electric power system. Besides, application of the control strategy and the theoretical analysis method related to the conventional synchronous generator to VSG is facilitated so as to play an important role in the active power distribution network and the microgrid in the future.

The invention discloses a double-output single-phase PFC convertor and a combined type power conversion system and control method thereof and belongs to the technical field of power electronic converters. The combined type power conversion system is composed of the double-output single-phase PFC convertor, a DC-DC circuit and a DCX circuit, the double-output single-phase PFC convertor is used for providing first direct-current voltage output and second direct-current voltage output, the first direct-current voltage output is used as input of the DCX circuit, the second direct-current voltage output is used as input of the DC-DC circuit, output of the DCX circuit and output of the DC-DC circuit are in parallel connection, and a fixed proportion is maintained between output of a first direct-current voltage of the double-output single-phase PFC convertor and output of the DCX circuit all the time and equals to the input / output voltage ratio intrinsic to the DCX circuit. By means of the double-output single-phase PFC convertor and the combined type power conversion system and control method thereof, power consumption of the PFC convertor can be decreased, the input power can be efficiently processed through the DCX circuit to the greatest extent, thereby overall efficiency is improved remarkably, and the double-output single-phase PFC convertor and the combined type power conversion system and control method thereof are particularly applicable to occasions alternating-current-direct-current electrical energy conversion with the load voltage changed substantially.

A fluid feeding pump which varies a volume of a pump chamber and thus feeds a fluid out of the pump chamber, includes: a piezoelectric element which accumulates electric charges inside when a voltage is applied, and which deforms according to an amount of accumulated electric charges and thus increases or decreases the volume of the pump chamber; a drive unit which applies a drive signal with a waveform increasing to a predetermined maximum voltage and then decreasing, and thus drives the piezoelectric element; and an air bubble determining unit which detects a current flowing through the piezoelectric element within a predetermined period after the drive signal is applied to the piezoelectric element, and thus determines whether there are air bubbles in the pump chamber or not.

The invention discloses a two-stage type AC-DC converter and a control method thereof and belongs to the power electronic converter technical field. The two-stage AC-DC converter is composed of a double-output PFC converter and two DCX circuits; the dual-output PFC converter provides voltage-constant high-voltage direct current output and voltage-variable low-voltage direct current output; the high-voltage direct current output and the low-voltage direct current output are respectively adopted as the inputs of the two DCX circuits; and the outputs of the two DCX circuits are connected in series and are connected with a load. According to the two-stage type AC-DC converter and the control method thereof of the invention, the voltage-variable low-voltage direct current output of the double-output PFC converter is utilized to directly realize wide-range regulation of the voltage of the load side, and therefore, the power loss of the PFC converter can be decreased, and the high-efficiency DCX circuits can be adopted at the later stage, and overall efficiency can be improved significantly. The two-stage type AC-DC converter and the control method thereof are especially suitable for AC-DC conversion conditions where load voltage varies substantially and have a high application value and a bright application prospect in fields such as the electric vehicle charging and energy storage field.

To equalize the intensity of light emitted by display elements on a display device, a plurality of current-drive circuits are connected in cascade through two terminals of each of the current-drive circuits, each comprising a reference current generation section including a reference resistor and a plurality of current drive sections. Reference current sunk by an external reference current source causes a voltage drop across the reference resistor, and the voltage drop is applied across a current adjustment resistor. In response to an image signal, the current-drive circuit outputs current, determined by multiplying each of a plurality of internal reference currents by an optional factor and summing the resulting currents to the display elements. Since the magnitude of the internal reference current flowing inside the current-drive circuit can be varied by varying the value of the current adjustment resistor, gamma correction can be applied to drive current with high accuracy.

A feeding technique for a storage unit is provided, in which power can be supplied from an optimum power source depending on an operation mode of a cache memory, the stable switching of feeding paths can be performed, and the feeding with high voltage accuracy and small voltage variation can be achieved. For its achievement, the feeding system in the RAID system including a hard disk drive, a disk adaptor, a channel adaptor, and a cache memory is provided. The feeding system includes a DC-DC power source to supply, to the cache memory, the voltage for a normal operation mode in which the data is written / read to / from the cache memory, and a DC-DC power source to supply, to the cache memory, the voltage for a backup operation mode in which the data stored in the cache memory is retained, and the power sources are switched during the feeding depending on the operation mode of the cache memory.

The invention discloses an organic LED display substrate and a manufacture method, and a display device. The display substrate comprises a substrate, a data line, a drive film transistor, and an energy storage capacitor, wherein the energy storage capacitor comprises a first capacitance plate and a second capacitance plate, a gate of the drive film transistor and the second capacitance plate are integral, the first capacitance plate comprises a body part and a first shield part, the first shield part extends to the middle of the second capacitance plate and the data line adjacent to the secondcapacitance plate, the first shield part can shield capacitance coupling between the second capacitance plate and the data line adjacent to the second capacitance plate, so as to reduce parasitic capacitance between the second capacitance plate and the data line. When voltage of the data line changes, voltage generated by the second capacitance plate is lowered, lowering voltage of a control electrode of the film transistor, therefore, when gray level of the pixel changes, display image abnormality is relieved.

The invention discloses a distributed voltage source converter cooperative control method and an AC-DC hybrid microgrid. The distributed voltage source converter cooperative control method comprises the following steps of: adjusting a power flow between an AC sub-grid and a DC sub-grid through a bidirectional interconnection converter; when the load of the AC sub-grid suddenly changes, calculating the total optimal power input of the AC sub-grid, and judging whether the DER total power in the current AC sub-grid reaches the total optimal power input of the AC sub-grid or not; if so, calculating the input power contribution of each DER in the AC sub-grid through using a virtual inertia algorithm; and if not, indicating that the DER in the DC sub-grid has redundant power, the DC sub-grid participates in cooperative control. According to the distributed voltage source converter cooperative control method, the inertia of the micro-grid is remarkably improved, the communication bandwidth is reduced, the service life of storage equipment is prolonged, and the method has the characteristic of quick and stable control.

The embodiment of the invention discloses a pixel driving circuit, a display panel and electronic equipment. The pixel driving circuit comprises an initialization module, a write-in module, a drivingtransistor and a light emitting module; the initialization module comprises a first transistor; the write-in module comprises a second transistor and a third transistor; the second electrode of the driving transistor is connected with the positive electrode of the light-emitting module and used for providing driving current for the light-emitting module in the light-emitting stage so as to drive the light-emitting module to emit light. Thus, under the condition that the voltage of the control electrode of the driving transistor is influenced by the leakage current of the first transistor and the second transistor which are connected with the driving transistor, the first transistor uses the N-type thin film crystal, and / or the second transistor uses the N-type thin film transistor, and dueto the fact that the leakage current of the N-type thin film transistor is small, the N-type thin film crystal is adopted, so the leakage current can be reduced to a greater extent, thereby reducingthe voltage change of the control electrode and solving the problem of abnormal display.

The invention relates to an autotransformer with single fuel tank and a dual-body. The dual-body includes a main transformer body and a compensation transformer body; the main transformer body includes a tertiary winding, a low-voltage regulating winding, a common winding, and a series winding, wherein the arrangement manner of all the windings, from an inner side of an iron core column to an outer side of the iron core column is that: the tertiary winding-the low-voltage regulating winding-the common winding-the series winding; the compensation transformer includes a compensation winding and an exciting winding, wherein the arrangement manner of all the windings, from an inner side of an iron core column to an outer side of the iron core column is that: the compensation winding B-the exciting winding J; and the main transformer body and the compensation transformer body are arranged in the same one fuel tank. The autotransformer can meet the demand of large-range voltage regulation, can effectively decrease a voltage deviation area of the tertiary winding, improve the operation quality of the tertiary winding under the low voltage and the high voltage, decrease a switch voltage class, decrease the number of selected switches, greatly improve the labor productivity, and enhance the reliability of operation.

There is provided a fuel cell system capable of reducing irregularities of voltage of fuel cells and stabilizing the generation power of the fuel cell stack. The fuel cell system includes a fuel cell stack formed by a plurality of fuel cells connected in series, a fuel supply device, an air supply device, and a controller. The controller sets at least one of the fuel supply amount and the air supply amount for each of the fuel cells according to voltage of each of the fuel cells so as to minimize the irregularities of voltages of the fuel cells. The fuel supply device supplies fuel to each of the fuel cells according to the fuel supply amount of each of the fuel cells and / or the air supply device supplies air to each of the fuel cells according to the air supply amount of each of the fuel cells.

The invention provides a liquid crystal display device, which comprises a liquid crystal panel and a data driver, wherein the data driver drives the liquid crystal panel to perform display. The liquidcrystal display device further comprises plug-in gray data generating circuit which outputs a plug-in gray data voltage to a data driving circuit. Each frame of the liquid crystal display device comprises a first subframe and a second subframe. The data driving circuit outputs an image data voltage at the first subframe, outputs the plug-in gray data voltage at the second subframe and drives theliquid crystal panel, and the plug-in gray data voltage of the current frame has the same polarity as that of the image data voltage of the next frame. The liquid crystal display device can eliminatethe phenomenon of blurred images during reverse driving. The invention simultaneously provides a driving method of the liquid crystal display device.

A transparent electrode includes a conductive layer and an intermediate layer disposed adjacent to the conductive layer. The transparent electrode has a light transmittance of 50% or more at a wavelength of 550 nm and a sheet resistance of 20Ω / □ or less. The intermediate layer contains an organic compound containing a sulfur atom having an unshared electron pair. The conductive layer is composed of silver as a main component.

The invention provides an operation vehicle and an electricity leakage detecting method thereof employing a simple circuit for judging electricity leakage with high precision. The operation vehicle is provided with a leakage detecting part (5) used for leakage detection of the electric capacitor; a circuit transferring switch cutting the capacitor (2) from a load circuit (1) and connecting the leakage detecting part (5) to the capacitor and besides cutting the leakage detecting part (5) from the capacitor and connecting the capacitor (2) to the load circuit (1); and a microcontroller making the circuit transferring switch (SW) to work, cutting the capacitor (2) off from the load circuit (1) and connecting the leakage detecting part (5) to the capacitor (2) when that the capacitor (2) is fully charged and current of the load circuit (1) is zero are detected, making the circuit transferring switch work, cutting the leakage detecting part (5) off from the capacitor (2) and connecting the capacitor (2) to the load circuit (1) after leakage detection of the capacitor is done by the leakage detecting part (5).