569 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.

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.

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 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 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.

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 nonvolatile ferroelectric memory device having a multi control function can determine a plurality of cell data in a reference timing strobe interval by setting a plurality of sensing voltage levels when cell data are sensed in a sensing critical voltage. In a read mode, a plurality of read data applied from a cell array block are stored in a timing data register array unit through a common data bus unit. In a write mode, a plurality of read data stored in the timing data register array unit or input data applied from a timing data buffer unit are stored in a cell array block through the common data bus unit. Here, since a plurality of sensing voltage levels are set in cell data, a plurality of sensed data bits can be stored in one cell.

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 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.

The invention provides a pixel unit driving circuit and method as well as a pixel unit. The pixel unit driving circuit comprises a driving thin film transistor, a first switching element, a storage capacitor, a driving control unit and a charging control unit; a grid electrode of the driving thin film transistor is connected with the first end of the storage capacitor, and is further connected with a drain electrode of the driving thin film transistor through the charging control unit; a source electrode of the driving thin film transistor is connected with an OLED (Organic Light Emitting Diode), and is connected with the second end of the storage capacitor through the driving control unit; the drain electrode of the driving thin film transistor is connected with a driving power supply through the first switching element; the second end of the storage capacitor Cs is connected with the driving power supply through the charging control unit; the driving control unit is connected with the driving power supply and the OLED respectively; and the charging control unit is connected with a data wire and the OLED respectively. With the adoption of the pixel unit driving circuit provided by the invention, critical voltage of the driving thin film transistor is compensated, and the fall of driving current, caused by boosting of critical voltage due to material aging of the OLED, can be compensated.

Methods, systems, structures and arrays are disclosed, such as a resistive memory array which includes access devices, for example, back-to-back Zener diodes, that only allow current to pass through a coupled resistive memory cell when a voltage drop applied to the access device is greater than a critical voltage. The array may be biased to reduce standby currents and improve delay times between programming and read operations.