1580 results about "Electric Capacitance" patented technology

A liquid developer which includes an insulating liquid, and toner fine particles containing a coloring agent and a toner resin. In the liquid developer, its electric capacitance does not significantly vary in an electric circuit where an electrical double-layer capacitor and an electronic resistance corresponding to a velocity of an electron exchange during an electrode reaction are connected in parallel, and a resistance corresponding to an electric conductivity of the insulating liquid is connected in series. The coloring agent has a coating layer so as to maintain distances between the toner fine particles. The insulating liquid has a viscosity of 0.5 mPa·s to 1000 mPa·s, a specific resistance of 1×10¹² Ωcm or more, and a surface tension of 30 dyn/cm or less, and may be a nonvolatile liquid having a boiling point of 100° C. or higher.

A method of driving a MEMS mirror scanner having an electrostatic actuator, comprising a step of driving the electrostatic actuator according to an input signal in accordance with a driving waveform obtained by the following equation,

The present invention belongs to the field of material preparing technology. By means of sol-gel technology, organic high molecule and silicon source are led into a surfactant self-assembling reaction system so as to prepare high ordered mesoporous high molecule/silica and carbon/silica composite material and ordered mesoporous carbon material through organic-organic competition, inorganic-inorganic competition, organic-inorganic competition, cross-linking polymerization coordinate assembling and solvent volatizing self assembling. The prepared mesoporous carbon material has high order property, great specific surface area, great caliber and great porosity, as well as excellent electrochemical properties as super capacitor and cell material. It has also wide application foreground in catalysis, adsorption, biomolecule separation, and other fields.

Provided are an electrolyte for a lithium secondary battery and a lithium secondary battery containing the same. The electrolyte for a secondary battery according to the present invention has excellent high-temperature stability, excellent low-temperature discharge capacity, and excellent life cycle characteristics.

Techniques for efficiently stabilizing an output voltage produced by a voltage regulation circuit are disclosed. One embodiment pertains to a voltage regulation circuit that includes a supplemental current source that can be controllably activated to provide a supplemental current to an output terminal of the voltage regulation circuit. This supplemental current can then assist in stabilizing the output voltage level at the output terminal of the voltage regulation circuit even in the presence of high current surges by a load (i.e., electronic circuitry). Advantageously, given the availability of the supplemental current, the required amount of capacitance for a decoupling capacitor (also coupled to the output terminal of the voltage regulation circuit) can be significantly reduced. In the case of semiconductor electronic devices, the reduction in the needed capacitance yields substantial die area savings with respect to decoupling capacitors.

A door handle apparatus for a vehicle includes a door handle adapted to be provided at a vehicle exterior of a vehicle door and operated in order to open/close the vehicle door, a sensing electrode provided inside of an upper-outer surface of the door handle, a sensor for detecting a user approaching the sensing electrode on the basis of a variation of an electric capacitance generated by the sensing electrode, controlling device for controlling the vehicle door so as to be locked/unlocked on the basis of information detected by the sensor and water-removing device provided on the upper-outer surface of the door handle in order to remove water retained in the vicinity of the sensing electrode.

A composite electrode and a method for manufacturing the same are disclosed. By using a composite electrode that includes a porous support made of ceramic or metal and a conductive polymer or a metal oxide formed on a surface of the porous support, a capacitor or secondary cell that provides increased charge/discharge capacity and increased energy/output density, as well as high-temperature stability and high reliability, can be manufactured.

A wireless resonant powering device (1) according to the invention comprises a first inductor winding (3), which is arranged to form a transformer (9) with the inductor winding (13) of the energizable load (11). The first inductor winding (3) is arranged to form a resonant circuit (5), which may comprise a suitable plurality of electric capacitances and coils. The components of the resonant circuit (5) are selected such that the magnetic energy received by the inductor winding (13) damps the energy flow in the resonant circuit so that the induced voltage in the inductor winding (13) is substantially constant and is independent of the magnetic coupling between the first inductor winding (3) and the inductor winding 13 at the operating frequency of the driving means (6). The resonant circuit is driven by the driving means (6), comprising a control unit (6c) arranged to induce an alternating voltage between a first semiconductor switch (6a) and a second semiconductor switch (6b). At the output of the transformer (9) an alternating voltage is generated, which is rectified to a DC-voltage by a diode rectifier, filtered by an output capacitance. The resonant circuit (5) is operable on its coupling independent point by the driving means (6). This figure schematically illustrates a situation, where a variable coupling between the first inductor winding (3) and the inductor winding (13) exists. The invention further relates to a wireless inductive powering device, an energizable load, a wireless system and a method for wireless power transfer.

The invention discloses composite nanometer carbon paper and a preparation method thereof. The nanometer carbon paper uses carbon nanometer paper as a framework network, MnO2 metallic oxides are deposited on the surface, the outer layer is covered with grapheme, and the composite nanometer carbon paper belongs to a flexible composite film material. The preparation method of the composite nanometer carbon paper comprises the steps that carbon nanometer tubes are dispersed in a solvent, then, the suction filtering is carried out to obtain carbon nanometer tube paper, next, the carbon nanometer tube paper is used as a carrier for depositing the MnO2 metallic oxides on the surface, and finally, the grapheme is adhered on the product surface to obtain target products. The electrical conductivity, the heavy current charging and discharging capability, the specific capacitance and the cycle life of the composite nanometer carbon paper are respectively and obviously enhanced through being compared with those of the carbon nanometer tube-MnO2, the problems that in the existing super capacitor, the metallic oxides easily fall off from the surface of the carbon nanometer tubes, the electrical conductivity of the metallic oxides is poor, and the like are solved, the composite nanometer carbon paper also has the characteristics of light weight and flexibility of materials and high efficiency, simultaneously, the preparation process is simple, the operation is easy, the controllability is good, and in addition, the cost is low. The composite nanometer carbon paper and the preparation method have wide application prospects in fields of new energy sources, advanced chemical engineering, electronic devices, film preparation and the like.

The invention discloses a frequency conversion driving control system and method based on an electrolysis-free capacitive inverter. The method comprises the following steps: detecting system input voltage current, bus voltage, motor phase current and rotating speed; carrying out Clark and Park conversion on three-phase current to obtain d and q axis current; carrying out error adjustment on a given rotating speed and an actual rotating speed; calculating q axis given current according to input voltage current, speed ring output and capacitance; calculating d axis given current according to voltage; calculating d and q axis error current and carrying out PI adjustment to obtain d and q axis actual voltage; limiting amplitude of actual voltage to obtain d and q axis calculated voltage; carrying out error adjustment on the actual voltage and the calculated voltage and taking the result as current ring feedback; carrying out Park inverse conversion on the d and q axis calculated voltage to obtain alpha and beta axis voltage; and modulating the inverter to control a motor. By the frequency conversion driving control system and method based on the electrolysis-free capacitive inverter, the motor can run at high speed in a flux weakening region, a network side high power factor is obtained, a control structure is simplified, and the reliability of the system is improved.

The invention relates to a porous carbon electrode materials and the preparation method, belonging to the electrochemistry and the novel energy source materials, wherein the porous carbon electrode materials adopt the template carbonization and the method combined with the CO2 post-processing using the meso-porous oxide silicon as the remplate, and the cane sugar, furfuryl alcohol, polyacrylonitrile and the like as the precursors, through the technology steps of the liquid phase impregnation, the high temperature carbonization and the template removal and the like, then combines high temperature process, obtaining the super capacitor porous carbon electrode materials. The porous carbon electrode materials prepared by the method has high surface area, large pore volume, adjustable pore structure and multilevel-microporous pore structure, wherein the pore channel is composed of a meso-porous of 2-5 nm and the microporous with the meso-porous wall of 0.1-2 nm, so the electrochemistry capacity of the prepared porous carbon electrode is marked increased, and the integral property of good.

The invention discloses a large-specific surface area nitrogen-doped mesoporous carbon sphere nanomaterial and a preparation method thereof. According to the preparation method, a cationic surfactant is taken as a template agent, a hydro-thermal reaction is performed on an organic silicon source, an organic carbon source and an organic nitrogen source to form an organic/inorganic composite, and then the organic/inorganic composite is roasted in a nitrogen atmosphere to obtain a silicon dioxide/nitrogenous carbon sphere nanomaterial, and removing silicon dioxide to obtain the nitrogen-doped mesoporous carbon sphere nanomaterial of a spherical mesoporous structure; the nitrogen-doped mesoporous carbon sphere nanomaterial has a large specific surface area, and preferably, the specific surface area is within the range of 1100-1200m<2>/g; and the pore size of the nanomaterial is within the range of 1.8-3.8, and the pore volume is within the range of 0.7-1.2cm<3>/g. Under the current density of 0.2A/g, the capacitance of the nanomaterial in a 6mol/L KOH electrolyte solution is 554.5F/g, and therefore, the nanomaterial has extremely high electrochemical capacitance and has a potential application prospect in the field of super capacitors. The preparation method is simple and easy to implement, low in cost, good in repeatability, and prone to large-scale production.

The present invention relates to a method of controlling a door drive, in particular of a roller door, wherein a capacitive sensor is used for the automatic recognition of obstructions in the region of the door closing path, wherein the recognition of obstructions on the closing of the door takes place by a comparison of the then current change in the capacity of the capacitive sensor with respect to a variable with a reference value or a reference curve. The invention furthermore includes a corresponding system of controlling a door drive.

A sensing circuit is provided that senses an externally provided pressure on a panel, and includes a sensing capacitor, a first switching element, a second switching element and a third switching element; where the sensing capacitor includes a sensing electrode on the first substrate, the insulating layer and the opposite electrode; the sensing capacitor varies a capacitance based on the externally provided pressure; the first switching element is electrically connected to the sensing electrode to charge the sensing capacitor based on a first switching signal; the second switching element outputs a current based on a second switching signal and a first voltage; the third switching element is electrically connected to the sensing electrode to control the current based on the variation of the capacitance of the sensing capacitor to generate a sensing signal; and where a thickness is decreased, and an image display quality is improved.

The invention discloses a self-locking socket and plug based on capacitance change, relates to the technical field of electric power and the self-locking socket and plug comprises a socket body, conductive columns are fixedly connected to the inner bottom walls of the two sides of the socket body, first springs are fixedly connected to the inner bottom walls of the two sides of the socket body, movable blocks movably connected with the inner wall of the socket body are fixedly connected to the tops of the first springs, and dielectric plates are fixedly connected to the middles of the movableblocks. The invention discloses a self-locking socket and plug based on capacitance change. The electromagnetic device is matched with the clamping block for use; when the plug is plugged with the socket, the plug extrudes the movable block to the bottom of the socket; the bottom of the movable block is contacted with the top of the conductive column; when the plug is pulled out by mistake, a circuit of the electromagnetic device is connected, at the moment, the clamping block moves outwards under the magnetic repulsion effect of the electromagnetic device, the clamping block is clamped with the clamping groove, movement of the plug is limited, and therefore the mistaken pulling prevention effect is achieved, the equipment plug is effectively prevented from being pulled out in the workingstate, stable work of equipment is guaranteed, and equipment burnout is effectively prevented.

A method including a remaining charge capacity determination step to determine a first remaining charge capacity from the first open circuit voltage and a second remaining charge capacity from the second open circuit voltage, a change in remaining charge capacity computation step to compute the change in remaining charge capacity from the difference between the first remaining charge capacity and the second remaining charge capacity, and a full-charge capacity computation step to compute the battery full-charge capacity from the change in remaining charge capacity and the change in charge capacity. The method computes battery full-charge capacity from the change in charge capacity and the change in remaining charge capacity when at least one of the values, namely the change in charge capacity, the change in remaining charge capacity, and the difference between the first open circuit voltage and the second open circuit voltage, is greater than a preset value.

A light-emitting element and a picture signal current supply circuit are formed near each of the crossings of scan lines and signal lines and a charging circuit is provided to precharge the electric capacitance of the light-emitting element with an electric load that is lower than the light-emitting threshold level of the element. With this arrangement, the time that needs to be spent before the light-emitting element, which is an organic EL element, starts emitting light is reduced so that it can be driven at high speed to display an image with tones.

The invention discloses a 3D electric capacitance tomography sensor. The 3D electric capacitance tomography sensor is used for fluid parameter measurement. The 3D electric capacitance tomography sensor comprises radical electrodes which are arranged on a pipe wall for fluid flowing, extend along a pipe axial direction and are arranged at equal intervals, a measuring electrode array which comprises multiple measuring electrodes which are arranged on the pipe wall at intervals, form multiple helical structures, are arranged in the intervals formed by the radical electrodes and are uniformly distributed on the pipe wall along a radial direction and an axial direction, and a shielding cover which electrically isolatedly covers the outer wall of the pipe.