65results about How to "Low control voltage" patented technology

An antenna and a wireless communication device are adapted to have a plurality of resonant frequencies changed simultaneously by a desired range at a low voltage. The antenna includes a first antenna section and a second antenna section. The first antenna section includes a feeding electrode, a frequency-changing circuit, and a radiating electrode, and the second antenna section includes the feeding electrode, a first reactance circuit, and an additional radiating electrode. The frequency-changing circuit has a circuit configuration in which the first reactance circuit and the second reactance circuit are connected. When a control voltage Vc is applied to a node P, the reactances of the first and second reactance circuits change in accordance with the magnitude of the control voltage Vc, so that a resonant frequency f1 of the first antenna section and a resonant frequency f2 of the second antenna section change simultaneously.

The present disclosure provides a power semiconductor switch series circuit. The power semiconductor switch series circuit includes a plurality of series modules and a system control module. Each series module has a power semiconductor switch; a drive module for driving each power semiconductor switch to be turned on or turned off; a short-circuit detection unit for outputting at least one detection signal; an equalizer circuit; a comparison module for comparing the detection signal with a predetermined threshold, and outputting a short-circuit signal when the detection signal exceeds the predetermined threshold; and a soft turn-off module for receiving the short-circuit signal and outputting a second control signal. The system control module receives the short-circuit signal and outputs a first control signal.

An apparatus for introducing electromagnetic perturbation into a target device includes a piezoelectric transducer configured to deflect in response to an applied voltage and a perturber configured to deflect in response to deflection of the piezoelectric transducer. The deflection of the perturber causes electromagnetic perturbation, and in some cases a phase shift, in the target device. The electromagnetic perturbation may also be used to tune microwave devices such as filters, resonators, and oscillators.

A method is provided for controlling operation of an air conditioning unit. The method comprises supplying line voltage to activate a motor configured to operate the air conditioning unit, and monitoring a supply of control voltage in order to control operation of the air conditioning unit, the supply of control voltage being derived from line voltage. In response to detecting a control voltage below a predetermined threshold and / or by a predetermined percentage, a time delay is initiated. The method further comprises deactivating the motor if a predetermined increase in control voltage is not detected before the time delay expires.

A drive circuit includes a drive element for supplying a drive current to a driven element; a control voltage generation circuit for outputting a control voltage to the drive element to generate the drive current through inputting a reference voltage; and a switch section for shutting down the reference voltage when the driven element is not driven so that the control voltage decreases to a level not to generate the drive current.

A constant output signal can be achieved by controlling a gain variable amplifier 2 based on a level of an output signal which is derived by variably amplifying a receiving signal S1 (input signal). An AGC output signal S11 is detected by a detector circuit 3, then a detected voltage signal S7 is converted into a digital signal by an A / D converter 4 to output it to a CPU 5. Then, the CPU 5 generates a control signal S8 based on the detected voltage signal S7, then an A / D converter 6 converts the control signal S8 into the analogue signal, and then the signal is sent out to the gain variable amplifier 2 to execute gain control. At this time, an RSSI detector portion 9 detects an RSSI signal S10 corresponding to a transmitting signal level from the receiving signal S1, and then the CPU 5 sends out the control signal S8 stored at the time of preceding execution of the gain control when the RSSI signal S10 is reduced below a predetermined threshold value S12. In the weak received electric field strength, the control voltage for the gain variable amplifier is prevented reduction, and the proper automatic gain control can be made possible to thus achieve the good receiving characteristics.

The invention discloses a flexible liquid crystal thin film and a preparation method thereof and belongs to the technical field of liquid crystal. The flexible liquid crystal thin film is divided into five layers, wherein the lowest layer is a black light absorption coating; and a lower transparent electrode layer, an interface layer, a liquid crystal layer and an upper transparent electrode layer are arranged on the black light absorption coating in turn. The preparation method comprises the following steps of: preparing the upper transparent electrode layer with display patterns, preparing the interface layer, preparing a liquid crystal box, filling liquid crystal and preparing the liquid crystal thin film. The invention has the advantages that: the preparation process is simple and is suitable for large-area display application; by the prepared flexible liquid crystal thin film, the bistable control of cholesteric liquid crystal is realized by utilizing an interface stabilization mode, the control voltage is reduced, and the film has rich colors; and moreover, a conductive electrode is treated by an etching technology, and a flexible pattern liquid crystal thin film is prepared.

A circulator with at least three ports (p1, p2, p3) comprises two identical electromechanical micro-switches of the series type (MEMS1, MEMS2) formed on the same substrate, a first micro-switch being disposed in order to allow the transmission of a radiofrequency or microwave signal from an input port (p1) to a port (p2) designed to be connected to an antenna, a second micro-switch being disposed in order to allow the signal transmission between the port (p2) designed to be connected to an antenna and said output port. Application to a radiofrequency or microwave telecommunications system.

An apparatus comprising one or more series transistor network elements and a plurality of shunt circuits. The series transistor network may be configured to generate an output signal in response to (i) an input signal, (ii) a first bias signal, and (iii) a plurality of variable impedances. The plurality of shunt circuits may each be configured to generate a respective one of the variable impedances in response to a second bias signal. The output signal may have an attenuation that is equal to or less than the input power. The amount of the attenuation may be controlled by the first bias signal and the second bias signal. The series transistor elements and the plurality of shunt circuits may be configured as two or more transistors each having two or more gates.

A gate drive unit includes a measurement unit, a multi-resistive driving device, and a processing unit. The measurement unit measures a voltage across main terminals of a power switch. The driving device includes plural individually controllable resistive elements. The processing unit controls a control voltage applied to a control electrode of the power switch to activate the power switch. The processing unit individually activates or deactivates the resistive elements of the multi-resistive driving device to change which of the resistive elements at least partially conducts the control voltage to the power switch at different times responsive to the voltage across the main terminals representing a short circuit event. The processing unit changes which of the resistive elements are activated or deactivated to control a rate at which the control voltage decreases.

A low control voltage switch utilizing a plurality of field effect transistors (FETs) having a total of six gates to allow the switch to operate at a low control voltage without the need to increase device periphery or die size. Feed-forward capacitors connected between the gate and source of an uppermost FET and the gate and drain of a lowermost FET are used to reduce signal distortion and improve the linearity and harmonic noise rejection characteristics of the FETs within the switch and thus lower the harmonics of the switch.

The invention discloses a micro-ring resonant cavity tunable optical filter based on liquid crystal slit waveguides. The micro-ring resonant cavity tunable optical filter comprises a substrate, a first straight waveguide, a second straight waveguide, a micro-ring waveguide, a first electrode, a second electrode and an upper wrapping layer. The first straight waveguide and / or the second straight waveguide are / is internally provided with slit structures or a slit structure, the first straight waveguide and the second straight waveguide are respectively arranged on the upper surface of the substrate, a slit structure is arranged in the micro-ring waveguide, the micro-ring waveguide is arranged on the substrate and located between the first straight waveguide and the second straight waveguide, the first electrode is arranged in an inner circular ring region of the micro-ring waveguide, and the second electrode is arranged in an outer circular ring region of the micro-ring waveguide. The first straight waveguide, the second straight waveguide, the micro-ring waveguide, the first electrode and the second electrode are respectively covered with the upper wrapping layer, and the slit structures are filled with the upper wrapping layer. The micro-ring resonant cavity tunable optical filter has the advantages of being low in control voltage, large in resonant wavelength tuning range and simple in structure.

Provided is a probe self-damping method applied to fast scanning atomic force microscopy. According to the method, a ZnO film is machined on the back of a probe of an atomic force microscope by a dry etching method, and adjustable external damping is introduced to the probe by controlling the ZnO film to generate stress based on the inverse piezoelectric effect of the ZnO film so as to adjust the elastic coefficient of the probe and improve the first oscillation frequency of the prob. Thus, the probe is enabled to be applied to fast scanning atomic force microscopy, and self-excited oscillation of the probe in the process of fast scanning is eliminated.

A method to improve characteristics of PIN diode switches, attenuators, and limiters via the control of nodal signal voltages by local impedance control.

The invention discloses a luminescent device with illumination and communication double functions. The luminescent device sequentially comprises a substrate layer, a buffer layer, an n-type layer, a quantum well layer, a p-type layer and a transparent electrode layer, wherein the n-type layer is used for generating electrons; the quantum well layer is compounded with electron holes; the p-type layer is used for generating holes; and a plurality of communication luminous chip core particles for forming a circular structure and a plurality of illumination chip core particles are deposited on the substrate layer. By the chip core particles in the circular structure, the electron holes of the quantum well layer compounded with the electron holes are evenly compounded to reach high compound rate, therefore, the technical effects of high speed and wide band of the device are reached; meanwhile, the chip core particles form the circular structure; the area and the volume of the chip core particles are reduced; and the response rate of the device is improved.

The invention discloses a liquid crystal aberration correcting method without wavefront detection. A used system comprises a liquid crystal aberration corrector, an image acquisition module, a convolutional neural network module and a grayscale conversion module. The specific method is as follows: the liquid crystal aberration corrector is used as an executing mechanism to correct distorted wavefront of received light; the image acquisition module is responsible for receiving light beams after liquid crystal correction, and acquiring the light beams as light spot images; after large-amount light spot data training, the convolutional neural network module is used for carrying out fitting according to the light spot images acquired by an imaging system to obtain Zernike coefficients corresponding to light spots; and finally, the grayscale conversion module is used for converting the Zernike coefficients obtained by fitting into grayscale values and controlling the liquid crystal aberration corrector to correct an aberration.

Area: OpticsOptical element with Braggs phase grating that consists of electro-optical material or is embedded in an additional layer. The Braggs phase grating is designed as a series of periodically applied elevations and indentations of the waveguide's surface, coated with one layer of the compensating material and one layer of the electrically isolating material, along the propagation of light. The phase grating is equipped with a means of generating a spatially inhomogeneous, aperiodic, external electrical field.Area of the InventionThe invention belongs to the physical area of optics and, in fact, to the optics methods and facilities for spectral filtering of optical radiation. This is based on electro-optical crystals and is to be used to produce narrow-band filters with a broad wave spectrum of changeover to wavelength, and for production of selective optical attenuators and modulators of light and optical equalisers.Description of the InventionThe object of the invention is, on the one hand, the production of optical elements in an integral optical design that have a multifunctional use (tuneable optical filters, selective optical attenuators and modulators, optical switches and optical equalisers), and which possess a high spectral selectivity, a broad wavelength band of tuneability, great dynamics, and a low tendency toward cross-talk. A further aim of this invention was to develop a process for control of the aforementioned filters that makes it possible to electrically control the profile of the transfer function, the location of the transfer function's maximum, the number of channels to be selected, and compensation of phase distortion, while using a relatively low control voltage, and with a high tuneability and switching speed.The task in hand is resolved by a large number of inventions that are related by one joint intention.

The invention relates to an electron source and an X ray source using the electron source. The electron source is provided with at least two electron emission regions; each electron emission region is provided with multiple micro electron emission units; each micro electron emission unit comprises a base layer, an insulated layer located on the base layer, a gate layer located on the insulated layer, an opening located in the gate layer and an electron emitter fixed on the base layer and corresponding to the opening; the micro electron emission units in the same electron emission region are electrically connected for emitting electrons at the same time or not emitting electrons at the same time, and different electron emission regions are electrically isolated.

A structure is provided which facilitates manufacturing of a flat type image display element which includes electrodes capable of enhancing the display efficiency with an extremely small control electrode current using a cathode material which can obtain a sufficient intensity of electron emission in a low electric field. A structure is provided in which control electrodes and cathodes are formed substantially on a the plane on a first panel, while control electrode lines which electrically connect the control electrodes of a plurality of pixels are not included in the plane which is parallel to a phosphor screen panel and includes the cathodes and the control electrodes.

The invention concerns a bistable device comprising a liquid crystal material, aligning means, which orient the liquid crystal to provide two stable or metastable textures, means for applying electric signals enabling to switch between the two textures, a polarizer (10) associated with the front surface of the device, placed inside or outside same, a reflective, specular or diffusing element, placed on the rear surface of the liquid crystal, inside or outside the device, allowing light to pass through the device twice and to return towards the observer or towards additional optical elements, and a compensator (20), placed between the polarizer and the reflective element, with an optical retardation dcDeltanc close to lambda0 / 4.

The invention relates to an MEMS (micro-electromechanical system) variable capacitor with a linear C-V (capacitance-voltage) characteristic and a low-stress double-lever structure. The MEMS variable capacitor is characterized in that a lower polar plate, driving electrodes and anchor points are arranged on a dielectric substrate, two ends of an upper polar plate are fixedly supported on the anchor points by the aid of torsion beams, the middle of the upper polar plate corresponds to the lower polar plate, and the ends of the upper polar plate correspond to the driving electrodes; when linear additional voltages are exerted on the driving electrodes, the ends of the upper polar plate move downwardly, the middle of the upper polar plate moves upwardly, and a capacitance value between the upper polar plate and the lower polar plate is decreased; when the linear additional voltages stop being exerted on the driving electrodes, an initial horizontal state of the upper polar plate is restored via torsion elastic force of the torsion beams, the outer ends of the upper polar plate move downwardly to drive the upper polar plate to move upwardly, the distance from the upper polar plate to the lower polar plate is increased, and the capacitance value C is linearly decreased along with increase of a voltage value. The MEMS variable capacitor has the advantages that the initial distance from the upper polar plate to the lower polar plate is decreased owing to a stepped structure of the middle of the upper polar plate, so that an initial capacitance value is increased, the capacitance variation range is enlarged, and stress generated by deformation when the upper polar plate moves can be released advantageously.

The invention discloses real-time zooming intelligent glasses based on a viewpoint positioning technology. The intelligent glasses comprise a glasses main body, lenses, a power supply device and a zooming control part, wherein two lenses of the intelligent glasses are liquid crystal zoom lenses, and the zooming control part comprises a central processing driving module, a viewpoint positioning device, an image acquisition mini lens and a zoom driving module. The zooming degree of the liquid crystal lenses can be adjusted in real time according to the eye use condition of a user, it is guaranteed that the lenses are just in the lowest degree needed for clear view, it is guaranteed that the eyes are always in the relaxed state of long-distance vision, and vision recovery and correction can be induced by adjusting the initial degree to enable the eyes to be in the micro under-correction state. The whole appearance of the glasses is consistent with that of traditional glasses, the eyesightcan be improved under the condition that normal eye use is not influenced, the glasses are suitable for people with myopia and hyperopia, people with normal eyesight can avoid asthenopia through wearing the glasses, and myopia is prevented.

In an injection molding machine, a control instruction value change unit decreases a control instruction value for each axis when a power outage is detected by a power outage detection unit and returns the control instruction value for each axis to an original value when a power recovery is detected by the power outage detection unit.

A clock and data recovery (CDR) circuit employing zero-crossing linearizing (ZCL) technique. The circuit including a voltage controlled oscillator (VCO), an inject-locked divider (ILD), a variable delay unit, a linearized loop, a bang-bang loop, and a loop filter (LP). The differential clock generated by VCO passes through ILD for frequency dividing and variable delay unit to generate 8-phase clocks. Then using these clocks, the PDs over-sample the input data, followed by synchronization and logic operation to control the CPs output current pulses. These currents filtered by LP control the VCO to finish the loop. The circuit recovers 4 channel data and corresponding clocks of the input with low power broken-down and preferable jitter performance and locking property.