578 results about "Critical voltage" patented technology

A power-up circuit includes a power supply voltage level follower unit for outputting a first bias voltage and a second bias voltage which increase or decrease in proportion to a power supply voltage; a first power supply voltage detecting unit for detecting that the power supply voltage becomes a first critical voltage level of the power supply voltage corresponding to a threshold voltage of an NMOS transistor in response to the first bias voltage; a second power supply voltage detecting unit for detecting that the power supply voltage becomes a second critical voltage level of the power supply voltage corresponding to a threshold voltage of a PMOS transistor in response to the second bias voltage; and a summation unit for performing a logic operation to a first detect signal outputted from the first power supply voltage detecting unit and a second detect signal outputted from the second power supply voltage detecting unit to thereby output a confirmation signal, wherein the confirmation signal is activated when the power supply voltage satisfies both of the first and second critical voltage levels.

A filament type nano-sized long fiber and a method of producing the same are disclosed. In the method, a spinning solution or a spinning melt is electro-spun in drops using a spinneret to which a critical voltage is applied, and the spun drops are continuously collected on a multi-collector. The spinning solution is produced by dissolving a blend or copolymer consisting of two or more kinds of polymers in a solvent. The spinning melt is produced by melting the polymers. The multi-collector is selected from the group consisting of a plate type collector, a roll type collector, and a combination thereof. The filament type nano-sized long fiber is processed into a yarn through one step during the electrospinning process, and thus, mechanical properties are better than those of a conventional nanofiber non-woven fabric. Consequently, the filament type nano-sized long fiber can be utilized for the extended application.

A method of controlling a motor-driven washing machine and a control system that controls a motor or any other components of the washing machine are disclosed. The method includes the steps of generating an interruption command for braking a motor in motion during a wash cycle, applying a phase-reversed voltage to a voltage input terminal of the motor in motion, and electrically shorting the input terminal of the motor for a predetermined period of time if a second phase-reversed voltage generated by the motor is higher than or equal to a critical voltage level. Using such method, a motor-clutch mechanism is prevented front generating a noise and from being damaged during a wash cycle.

The invention is appropriate for the field of gate drive technology, which provides a gate drive for inhibiting drift of a critical voltage, so as to provide a multi-gate signal to a multi-gate line, where the gate drive includes multi-level shift register, where each level shift register includes a pull-up unit, an energy storage unit, a buffer unit, a discharge unit, a pull-down unit, a control unit and a signal switch unit, where the pull-up unit pulls a gate signal up according to a drive control voltage and a first frequency; the buffer unit is used for receiving a input signal; the energy storage unit executes a charging procedure according to an input signal so as to supply a drive control voltage; the discharge unit pulls the drive control voltage down according to a control signal; the pull-down unit pulls a gate signal down according to the control signal; the control unit generates the control signal according to the input signal and a second frequency with opposite phase relative to the first frequency; and the signal switch unit switches the control signal according to the first frequency.

An alarm-including protection apparatus and method thereof are used to protect a lithium-ion battery with a plurality of series cells. The protection apparatus includes a voltage balance controller for detecting the terminal voltage of each cell and correcting the terminal voltage of each cell. A protection unit and the lithium-ion battery are connected in series. A microprocessor connects to the voltage balance controller and the protection unit for receiving the terminal voltage of each cell and figuring out a voltage difference between the maximum terminal voltage and the minimum terminal voltage of the series cells. According to the comparison result of the voltage difference and a plurality of critical voltage differences, the microprocessor is used to correct the terminal voltage of each cell, generate an alarm signal or stop charging to the lithium-ion battery.

This invention discloses a surface treatment method for Mg-based material. The method comprises: (1) performing micro-arc oxidation treatment on Mg or Mg alloy work piece as the anode in a Cl--free alkaline micro-arc oxidation electrolyte; (2) activating; (3) performing preliminary chemical plating of Ni; (4) performing chemical plating of Ni; (5) performing thermal treatment. The micro-arc oxidation treatment comprises: (1) applying a positive pulse with an average current density of 5-20 A / dm2 until the voltage is automatically elevated to a critical value, and applying a constant working voltage of 50-80 V (total time = 5-30 min); (2) applying a positive pulse of 30-300 V and a negative pulse of 0-200 V with an average current density of 0.5-15 A / dm2 (total time = 10-60 min). The activation comprises: (1) performing anode alkaline coarsening treatment for 3-10 min; (2) performing surface activation treatment; (3) performing cathode alkaline electrification reduction activation treatment; (4) performing cathode acidic electrification dispergation activation treatment. The treated Mg alloy work piece has high corrosion resistance of ceramic materials and the properties and touch sense of metal materials.

A high-voltage light emitting diode (LED) circuit having a plurality of critical voltages and an LED device using the same are described. The high-voltage LED circuit includes a first substrate, at least a first LED formed on the first substrate, and at least an impedance element formed on the first substrate and electrically connected in series with one end of the first LED. The first LED is connected in parallel with at least a second LED based on the characteristics of the impedance element, and the second LED has a polarity opposite to that of the first LED, such that the high-voltage LED circuit may be operated in an AC power supply environment, thereby improving the convenience of using the LEDs.

The embodiment of the invention discloses a battery charging method, which comprises following steps: charging a battery in a constant-current manner; stopping constant-current charging when the voltage of the battery end reaches a charging critical voltage; charging the battery in a constant-voltage manner by using a voltage as the critical charging voltage; stopping constant-voltage charging when the charging current reaches a charge cutoff current; and arranging the battery in an open standby state. The embodiment also discloses a battery charging device, which comprises a central processing unit, a detection unit, a battery and a charging / discharging control unit, wherein the units are matched with each other to charge the battery in constant-current manner, the constant-current charging is stopped when the voltage of the battery end reaches to the charging critical voltage, the battery is charged in a constant-voltage manner by using a voltage as the critical charging voltage, then constant-voltage charging is stopped when the charging current reaches to a charge cutoff current, and the battery is set in an open standby state. The battery charging method and the device provided by the embodiment can prolong the service life of the battery and improve the battery security.

A light-emitting diode display and a pixel circuit and a driving method thereof are provided. The pixel circuit of the light-emitting diode display comprises a light-emitting diode, six transistors and two capacitors, and receives a first to a fourth control signals and a first to a third reference voltages so as to improve influences caused by critical voltage changes of the transistors. Moreover, a display using the pixel circuit of the light-emitting diode is also disclosed.

The invention relates to a pollution flashover index forecasting method for a regional power grid, belonging to the technical field of transmission and distribution monitoring. The method of the invention comprises the following steps: (1) forecasting the current value of the equivalent salt deposit density in real time by an insulator surface equivalent salt deposit density forecasting model; (2) forecasting pollution flashover critical voltage by an insulator pollution flashover critical voltage forecasting model; (3) forecasting the insulator pollution flashover index of the power grid by a pollution flashover graded forecasting and prewarning model; and (4) judging the state. The invention has the advantages of providing a multivariable equivalent salt deposit density time sequence forecasting model based on phase space reconstruction, solving by a supporting vector machine model, solving the forecasting problem under the conditions of small sample of equivalent salt deposit density data and noise, and improving the forecasting prediction.

The invention discloses an organic light emitting display and an organic light emitting pixel with the voltage compensation technology, which comprise a first capacitor, a first thin film transistor, a second thin film transistor, a third thin film transistor, a reset circuit and an organic light emitting diode. The first thin film transistor receives a first voltage and the second terminal of the first thin film transistor is coupled to the grid and the first terminal of the first capacitor. The second thin film transistor receives a second voltage and the grid of the second thin film transistor is coupled to the grid of the first thin film transistor. The third thin film transistor is coupled to the first capacitor and receives a pixel voltage and a scanning signal. The reset circuit sets the first terminal of the first capacitor to be a first voltage level. The anode of the organic light emitting diode is coupled to the second terminal of the second thin film transistor and the cathode of the organic light emitting diode receives a third voltage. The invention can improve the speed of the critical voltage compensation, and can make up for the deficiency that the picture is not uniformly displayed on the prior organic light emitting display.

The invention discloses a pixel driving circuit of an organic light-emitting diode, which comprises a first transistor, a capacitor, a second transistor, a third transistor, a fourth transistor, a fifth transistor and an organic light-emitting diode. The operation of the pixel driving circuit mainly comprises three stages, including discharging, data writing, driving lighting. The pixel driving circuit compensates critical voltage of the transistor in the data writing stage so that the driving current of the organic light-emitting diode is unrelated to the change of the critical voltage.

An error voltage Verr, being a difference between DC output voltage Vout and output reference voltage Vref, and an input voltage Vin are multiplied to produce first threshold voltage signal Vth1 in phase with and similar to input voltage Vin and proportional to Verr. Second threshold voltage signal Vth2 is produced from first threshold voltage signal Vth1. The input current is detected as a current detection signal Vi across a resistor 12, whether it is between the threshold value signals is detected by a current range detecting circuit, and accordingly, the timing of turning on or off switching device is controlled so that at least one of an duration on and an off duration of the switching device is limited to enhance a power factor. Unfixed off duration disperses a noise spectrum to prevent an increase in switching frequency, to reduce noise.

An alarm-including protection apparatus and method thereof are used to protect a lithium-ion battery with a plurality of series cells. The protection apparatus includes a voltage balance controller for detecting the terminal voltage of each cell and correcting the terminal voltage of each cell. A protection unit and the lithium-ion battery are connected in series. A microprocessor connects to the voltage balance controller and the protection unit for receiving the terminal voltage of each cell and figuring out a voltage difference between the maximum terminal voltage and the minimum terminal voltage of the series cells. According to the comparison result of the voltage difference and a plurality of critical voltage differences, the microprocessor is used to correct the terminal voltage of each cell, generate an alarm signal or stop charging to the lithium-ion battery.

The invention discloses a production device for a curtain solid pin electrode nano fiber, which mainly includes a liquid storage tank, a curtain solid pin electrode thread ejector, a receiving device and a high-voltage electrostatic generator, wherein the curtain solid pin electrode thread ejector is characterized by consisting of a metal curtain, a solid pin electrode and a rotating roller; the breadth of the curtain pin electrode thread ejector ranges from 20 to 200cm, and the pin density of the solid pin electrode is 1 to 16 / cm2; the solid pin electrode is characterized in that the pin structure is either forked, cylindrical, conical or pyramidal; the solid pin electrode (22) is characterized in that the pin length ranges from 1 to 4cm, the pin tip dipping length ranges from 0.2 to 1mm. The industrial production device is sufficient for the production of the spinning solution electrospun nano fiber with the density amounting to more than 25%, the critical voltage thereof is generally no higher than 25kV, the production efficiency is higher than 50g / min, the diameter of the prepared nano fiber ranges from 50 to 500nm, and the uniform diameter is smaller than 400nm.

The present invention disclosed herein is an electric leak breaker for self-test. The electric leak breaker for self-test comprises power supply lines for connecting a power source supply with a load; a zero-phase current transformer installed on the power supply lines and for sensing a current difference between the power supply lines; a leakage current detecting unit connected to the zero-phase current transformer for detecting whether a leakage current occurs to generate a detection signal; a driving unit for making the power supply lines broken when a critical voltage or a voltage higher than the critical voltage is provided; and a self-test unit for periodically inducing the leakage current at the power supply lines to test whether the leakage detecting unit is normally operating, and for providing a lower voltage than the critical voltage to the driving unit to test whether the driving unit is normally operating in a self-test operation. According to the present invention, it is possible to periodically test the electric leak breaker as well as to overcome an inconvenience to push a reset button.

The invention discloses a method for acquiring a direct current busbar voltage given value of an air conditioner system and a device for acquiring the direct current busbar voltage value of the air conditioner system. The acquiring method comprises the following steps: acquiring a motor parameter of a compressor, a running current and a running frequency of the compressor in the air conditioner system; calculating a weak magnetic critical voltage based on the motor parameter, the running current and the running frequency, and acquiring a standby voltage given value based on the weak magnetic critical voltage; detecting an input voltage of the compressor, and acquiring an input voltage peak value based on the input voltage; and limiting the amplitude of the standby voltage given value based on the input voltage peak value, a preset lowest busbar voltage given value and a preset highest busbar voltage given value, so as to acquire the direct current busbar voltage given value. The acquiring method allows the direct current busbar voltage given value to meet the running requirements of the compressor, the hardware voltage-resistance requirements, and the lowest working voltage requirements of a switch power supply inside the air conditioner system at the same time, and allows a PFC circuit to have only the voltage boosting function.

The present invention is multiple-layer film stress and Young's modulus measuring structure and method for microelectronic mechanical system. The measurement structure has superposed n layers of measured film material in equal length a unequal width with fixed two ends to constitute the multiple-layer beam, reinforcing anchor areas on two ends, branched edges on two sides of each anchor area with hole in between, one insulator under the beam and electrodes under the insulator. The measurement method includes: preparing the beam structure, applying voltage across the lower electrodes, increasing the voltage until reaching the critical voltage and recording the sucking voltage, and substituting k measured sucking voltage values into the calculation model of stress and Young's modulus to obtain the stress and Young's modulus of the multiple-layer film.

The invention discloses an electrospinning device for dynamically controlling the curvature of a spinning solution and an application method for the electrospinning device. The electrospinning device comprises a solution supply system, an electric field control system, a spinning solution curvature regulating system and a nanofiber collecting system. The application method for the electrospinning device comprises the steps of adopting a first electrospinning method to regulate the curvature of the spinning solution to a constant value so as to produce a narrowly distributed nanofiber product, adopting a second electrospinning method to regulate the dynamic change of the curvature of the spinning solution so as to produce a multistage narrowly distributed nanofiber product, or adopting a third electrospinning method to control an electric field and regulate the curvature of the spinning solution so as to produce the narrowly distributed nanofiber product simultaneously. According to the electrospinning device for dynamically controlling the curvature of the spinning solution and the application method for the electrospinning device, since the spinning solution curvature regulating system is adopted, precise control over the curvature of the edge of the spinning solution can be achieved, the regulation of a batch free solution level spinning process can be achieved, and the critical voltage required for the free liquid surface for electrospinning can be reduced; besides, batch, stable and controllable production of the nanofiber products can be achieved, the curvature of the edge of the spinning solution can be dynamically regulated, and one-step production of aggregation of the multistage narrowly distributed nanofiber product is achieved.

The invention discloses a pixel control circuit including an organic LED, a drive transistor, a drive circuit, a discharge circuit and a compensation circuit. The drive transistor is used for conduction or close of the organic LED; the discharge circuit is used for controlling electrical connection between the organic LED and the initial voltage so as to suitably provide an organic LED discharge path; the compensation circuit is used for compensation of the conduction current during the lighting process of the organic LED so as to realize that the conduction current has no relation with the magnitude of the critical voltage of the drive transistor; and the drive circuit is used for controlling electrical connection between the preset voltage and the drive transistor so as to realize lighting of the organic LED.

A grid of a first thin-film transistor in a display pixel discharges by permeating the first thin-film transistor and a light-emitting diode in a compensation and data writing stage. After the service time is increased, discharging (charging) voltage can be smaller and gird voltage of the first thin-film transistor can be larger so as to compensate decrease of current of the light-emitting diode when critical voltage of the first thin-film transistor becomes larger and the carrier mobility becomes smaller or cross voltage of an organic light emitting diode rises after long-time use or the size of a light-emitting diode display becomes larger to produce IR (infrared ray) voltage drop. Moreover, a fifth thin-film transistor and the first thin-film transistor for driving the light-emitting diode also have the characteristic of critical voltage rise, and influences of efficiency drop of the light-emitting diode can be compensated when the critical voltage of the fifth thin-film transistor rises along with increase of the service time.

The invention discloses a slew rate multiplier of a dynamic CMOS operational amplifier, the operational amplifier is provided with a positive phase input end, a negative phase input end, a positive phase output end and a negative phase output end, and the slew rate multiplier comprises: a comparing unit, which ascertains a first status signal and a second status signal according to a difference value of the voltage of the positive phase input end and the voltage of the negative phase input end, wherein, when the difference of the voltage of the positive phase input end and the voltage of the negative phase input end is more than the value of critical voltage, the first status signal is available, and when the difference of the voltage of the negative phase input end and the voltage of the positive phase input end is more than the value of critical voltage, the second status signal is available; and an execution unit, which receives the status signals, wherein, when receiving the available first status signal, the charging current to the positive phase output end and the discharging current to the negative phase output end are increased, and when receiving the available second status signal, the charging current to the negative phase output end and the discharging current to the positive phase output end are increased.

A PWM device able to automatically change output frequency according to load variation of power supply is composed of a delay comparator for comparing between feedback voltage, high critical voltage and low critical voltage and performing delay operation to output frequency varying signal A, a signal synchronizer for receiving signal A and outputting a power-saving enable signal B, a dual-frequency oscillator for receiving signal B and outputting relative oscillation frequency, and a PWM controller for receiving the oscillation frequency and outputting a drive signal.

This invention discloses a pulse width modulation device for controlling the electricity-save mode utilizing an output voltage feedback delay circuit used in a supply supplier to follow the change of a load to further control to output a drive signal including: a delay comparing circuit extracting a feedback voltage, a high critical voltage and a low critical voltage to output a blanking signal after the comparison and delay operation on them, a pulse width modulation control unit extracting a current feedback signal and said feedback voltage to output a modulation signal after the internal comparison operation, an OR gate circuit connecting to said delay comparing circuit and the pulse width modulation control unit, receiving said blanking signal and said modulation signal to output a reset signal and a synchronous signal output unit connected to said OR gate circuit, receiving said reset signal and an oscillation signal for outputting said drive signal.

A voltage-variable capacitor uses the channel-to-substrate junction from a gated diode formed from a metal-oxide-semiconductor transistor. The transistor gate has at least two contacts that are biased to different voltages. The gate acts as a resistor with current flowing from an upper gate contact to a lower gate contact. The gate-to-source voltage varies as a function of the position. A critical voltage is where the gate-to-source voltage is equal to the transistor threshold. A portion of the gate that has gate voltages above the critical voltage has an inversion layer or conducting channel under the gate. Another portion of the gate has gate voltages below the critical voltage, and thus no channel forms. By varying either the gate voltages or the source voltage, the area of the gate that has a channel under it is varied, varying the channel-to-substrate capacitance. Separate gate arms reduce bias current.

The invention discloses a control method and a system of a PFC circuit in an air conditioner and the air conditioner, wherein the method comprises the following steps: input current and input voltage of the PFC circuit are detected, and an effective value of the input current and a peak value of the input voltage of the PFC circuit are obtained; weak magnetic critical voltage of a compressor is calculated according to compressor parameters and operation parameters; and the opening and the shutoff of the PFC circuit are controlled according to the effective value of the input current and the peak value of the input voltage of the PFC circuit and the weak magnetic critical voltage of the compressor. The control method of the PFC circuit in the air conditioner can reduce the consumption of electric energy by the PFC circuit.

The present invention relates to an electrical power supply system for powering an electric load of a vehicle comprises a main battery, a support battery and a battery control module. The battery control module comprises a first terminal for connection to said main battery, a second terminal for connection to said support battery and a third terminal for connecting to said electric load. Furthermore the module comprises a voltage comparator arranged to determine a voltage at the third terminal, and output a high output level when said determined voltage is less than a predetermined critical lowest voltage level. A first switch is arranged between said first terminal and said third terminal, said first switch being controllable by a first control signal. A second switch is arranged between said second terminal and said third terminal. The battery control module is arranged to connect the support battery to the load by turning the second switch conducting in case the voltage at the third terminal drops below a predetermined critical voltage. The invention provides the automatic activation of a support energy source when the output voltage falls below a specified voltage threshold. The support battery supports the main battery when needed or acts as a redundant power source. It is purely needed as a backup battery and not used in normal situations, so charging of this battery is less frequently needed, increasing its lifetime.

A cell test method for a liquid crystal display panel includes the following steps. A waveform sequence to shorting bars is provided, wherein the waveform sequence includes that the first gate line sends a voltage of turn on signal and the second and third gate lines send a voltage of turn off signal at the first and second time periods; and the waveform sequence further comprises that the first and second data lines respectively send first and second voltages at the first and second time periods, the first threshold voltage is higher than the first voltage, the first voltage is higher than the common voltage, the common voltage is higher than the second voltage, and the second voltage is higher than the second threshold voltage, whereby pixels defined by the first gate line and the first and second data lines is turn on.

The invention provides a displayer and a driving method of the displayer. The displayer is provided with a pixel circuit. The pixel circuit comprises an organic light-emitting diode, a transistor, a first capacitor, a second capacitor, a first switch, a second switch, a third switch and a switch unit. The invention further provides a driving method used for driving the pixel circuit. As a result, the first switch, the second switch, the third switch and the switch unit are controlled, so that a driving current generated by the transistor is unrelated to the critical voltage of the transistor substantially.