45results about How to "Change capacitance value" patented technology

The invention discloses a capacitance humidity sensor with temperature drift compensation and a making method thereof. The sensor main body adopts the surface micro-mechanical machining technology to form an isolation layer on a semiconductor substrate and a humidity sensing cantilever and upper and lower electrodes on the isolation layer, wherein a first humidity sensitive material layer, a humidity isolation layer and a second humidity sensitive material layer are piled up on the humidity sensing cantilever from bottom to top; and the upper electrode is covered on the lower surface of the first humidity sensitive material layer and forms sensitive capacitance with the lower electrode. When the ambient humidity changes, the size changes of the first humidity sensitive material layer and the second humidity sensitive material layer are different, so as to enable the humidity sensing cantilever to be deformed and then the upper electrode to be deformed, as a result, the capacitance between the upper and the lower electrodes is changed, and the change of the capacitance value can represent the change of the ambient temperature. When the ambient temperature changes, if the size changes of the two humidity sensitive material layers of the humidity sensing cantilever are the same, the effect of phase drift compensation is achieved, and the capacitance humidity sensor with the temperature drift compensation has the outstanding property of low temperature drift.

The invention discloses a phase-locked loop frequency synthesizer which is characterized in that the phase-locked loop frequency synthesizer comprises a phase-frequency phase discriminator, a charge pump, a low-pass filter, a broadband differential LC oscillator provided with a capacitor array of a control switch, a multimode frequency divider and a controller which is used for a self-adapting frequency regulating curve; the analogue signal control end of the broadband differential LC oscillator is connected with an output signal Vctrl of the low-pass filter, and the digital signal control end thereof is connected with the output end of the controller. The phase-locked loop frequency synthesizer further comprises a 3-order full digital Sigma-delta modulator provided with a three-bit quantizer. The phase-locked loop frequency synthesizer can realize fractional frequency division, and the output frequency signals thereof can be continuously changed at a wide range, and the precision of the frequency spectrum is high.

The present invention provides a time-to-digital converter which comprises the following components: a coarse detecting circuit, an interface circuit and a fine detecting circuit, wherein the coarse detecting circuit finally realizes time-to-digital convection in a large input range by means of counter through designing a delay line to an annular member and multiplexing a judging unit as a delaying unit. The interface circuit is used for transmitting a time allowance which is generated by the coarse detecting circuit to the fine detecting circuit. The fine detecting circuit realizes high-precision time-to-digital convection with adjustable precision through adjusting a gate oxide capacitor of a field effect transistor and fixing the frequency difference between two oscillators in a differential annular oscillator to a fixed small value. Overall, through the three modules, the time-to-digital converter of the invention can perform high-precision large-range convection on the time interval through a relatively small area expenditure.

The present invention discloses a full flexible passive pressure sensor based on microdroplet, and a manufacturing method thereof, and a detection method thereof. The full flexible passive pressure sensor based on the microdroplet comprises: two layers of conductive electrodes forming an induction cavity, a sensing liquid drop dropping into the induction cavity, sensor coils arranged at two sidesof the induction cavity, interval layers arranged in the sensor coils, and flexible covering films covering the conductive electrodes and the sensor coils, wherein the induction cavity is internally provided with a space used for expanding the sensing liquid drop. Under the external load effect, flexible covering films of the sensor are bent and deformed to compress the sensing liquid drop in thesensor to be expanded all around so as to change the capacitance value of the device; and moreover, corresponding change of the resonant frequency is converted to signals which can be detected by an external electromagnetic coupling coil, and the sensor is high in sensitivity, reliable in repeatability, high in stability, convenient to detect and high in detection precision.

The invention discloses an on-chip integrated broadband linearizer based on a variable capacitor, and belongs to the technical field of microwave and millimeter wave monolithic circuits. A linearizedcircuit control module is used for controlling a direct-current voltage drive provided for a reflective pre-distortion signal generator and a cold-mode pHEMT transistor compensation correction circuit, so as to adjust the size of the generated linearized signal. Then, a reflective pre-distortion signal generator and a cold mode pHEMT transistor compensation correction circuit are combined; the pre-distortion signals are generated and compensated, pre-distortion linearized signals are finally generated to counteract nonlinearity of the power amplifier, and the reflective pre-distortion signal generator and the cold mode pHEMT transistor compensation correction circuit are matched with a low-loss matching module to further reduce insertion loss. According to the broadband linearizer, the problem that a traditional linearizer cannot be applied to a broadband is solved, and the bandwidth is better broadened. The filter has the characteristics of low insertion loss, wide application bandwidth, compact structure and remarkable linearization improvement.

The online RC high-temperature smoke moisture device comprises: a RC humidity sensor with a macromolecular film capacitor humidity sensor and a temperature sensor and a heater (Hr) connected to a heating temperature controller, a high-frequency oscillation circuit with input end connected to said humidity sensor and output end connected to the following conversion circuit, a frequency / voltage conversion circuit to output voltage signal direct proportioned to water content and connect to the following compensation circuit and take zero point full scale calibration by a calibration circuit, a smoke compensation treatment circuit, and a current-to-voltage conversion circuit. Wherein, directed outputting the calibrated signal or through the current-to-voltage conversion circuit to display device. This invention ensures the precision and reliability to meet practical application request.

A water level detection system comprises a water containing device, a first slide rheostat, a sensor, a frequency-to-voltage converter, a comparison circuit and an indicating module, where the water containing device comprises a water tank, a floating block floating on the water surface of the water tank and a connecting part connected with the floating block; the first slide rheostat is connected with the connecting part; the sensor is connected with the first slide rheostat; the frequency-to-voltage converter is connected with the sensor; the comparison circuit is connected with the frequency-to-voltage converter; the indicating module is connected with the comparison circuit; the floating block is used for being driven by rising and falling of the water level to drive a slide end of the first slide rheostat to move so as to change the voltage of the sensor; the sensor is used for changing the capacitance according to changes of the voltage so as to change the voltage output by the frequency-to-voltage converter; the comparison circuit is used for comparing the voltage output by the frequency-to-voltage converter with a reference voltage so as to determine whether the indicating module is to be started or not.

The invention discloses a microstrip circular polarized antenna and a work frequency adjusting device and method thereof. The antenna comprises a grounding board, a medium substrate, a radiation paster and a variable capacitor, wherein the medium substrate is arranged on the grounding board, the radiation paster is pasted on the medium substrate and is applied to an equivalent capacitor or inductor to separate the tuning frequency of a degenerated orthogonal mode, the variable capacitor is connected with the radiation paster, and the variable capacitor is used for adjusting the center frequency of the antenna. The antenna is advantaged in that through applying different offset voltages to the variable capacitor, a capacitance value of the variable capacitor is changed, and adjustment on the work frequency of the antenna is realized.

The invention discloses a capacitive temperature sensor and a using method thereof. The capacitive temperature sensor is composed of a temperature sensing bag, a capillary tube, a bellows, a base, a temperature sensing working medium, a capacitor left electrode plate and a capacitor right electrode plate; the base is an L-shaped plate structure; a semi-circular groove is opened on a vertical plate; one end of the bellows is fixedly connected in the semi-circular groove, and the capillary tube and the temperature sensing bag are fixedly connected in order outwardly; the other end of the bellowsis overhanging on a horizontal plate of the base, and the end surface of the bellows is fixedly connected to the capacitor left electrode plate; the capacitor right electrode plate is vertically andfixedly connected to the base with a gap from the capacitor left electrode plate; and the communicating bellows, capillary tube and temperature sensing bag are filled with the same temperature sensingworking medium. The capacitive temperature sensor has the advantages of a simple structure, convenient operation during a using process, a small system error, a low economic cost, and double improvement of energy saving and safety.

The invention provides a liquid crystal display panel which comprises an array substrate and a color film substrate. The array substrate is provided with substrate routing and multiple gate pole chip on films, the surface of the color film substrate is provided with a common electrode layer which covers the substrate routing area and is of a hollowed-out structure, and then the area of the common electrode layer projected on the array substrate fringe area is reduced, so that a capacitance value between the common electrode layer and the substrate routing is adjusted. The liquid crystal display panel and the display device have the advantages that for the liquid crystal display panel, the capacitance value between the common electrode layer and the substrate routing is changed through the hollowed-out structure of the common electrode layer, a capacitance value difference is offset, and the technical problem that due to the fact that a difference caused by the capacitance value difference exists in voltage input into the panel, the display phenomenon of being poor in horizontal block is solved.

The invention discloses a frequency modulation screw rod structure used for a cavity filter. The frequency modulation screw rod structure can be disposed on the cover plate of the cavity filter, and is fixedly connected with the cover plate of the cavity filter, and comprises a screw rod; a coupling disc connected with the screw rod; and a resonant rod, which can be fixedly disposed in the housing of the cavity filter. The axis of the screw rod is parallel to the axis of the coupling disc, and a certain distance is arranged between the axis of the screw rod and the axis of the coupling disc. The invention also discloses the cavity filter. By adopting the cavity filter and the frequency modulation screw rod structure thereof, the debugging operation can be reduced, and the screw types can be reduced; the adjusting range can be increased, and the filter debugging efficiency can be increased.

Disclosed is a capacitive pressure sensor, applicable to the field of sensors. The capacitive pressure sensor includes a substrate and a cover plate. The substrate includes a top layer, a bottom layerand an insulation layer, the lower surface of the bottom layer is provided with a groove, a lid groove, so that the groove forms a vacuum cavity, and a varistor film is formed on the groove bottom ofthe groove, wherein the top layer is provided with a movable interdigital capacitor and a fixed interdigital capacitor which are staggered and arranged at an equal distance from each other, the movable interdigital capacitor is bonded to the varistor film through an insulating layer positioned directly below the movable interdigital capacitor, and the insulating layer directly below the fixed interdigital capacitor is suspended between the bottom layer and the fixed interdigital capacitor. The embodiment of the invention also discloses a preparation method of a capacitive pressure sensor anda pressure measuring device. When the varistor film is deformed, the area of the movable interdigital capacitance relative to the fixed interdigital capacitance can be changed, thereby changing the capacitance value, and exhibiting a good linear output. At the same time, the vacuum sealing property is good, and the lead-out of the electrode in the vacuum cavity can be avoided.

The invention provides a MOS structure used for a packaging level reliability test. An equivalent circuit is characterized in that a grid electrode, a drain electrode, a source electrode and a substrate are connection points; the source electrode and the substrate are connected so as to be served as an equipotential point; a capacitor is added between the drain electrode and the substrate so that the capacitor is parallel to an output capacitor CDS of a tested MOS. The invention also provides a manufacturing method of the MOS structure used for the packaging level reliability test. A process of an original MOS structure is used. The capacitor is added in the tested MOS structure. An active region is taken as a lower pole plate. A gate oxide layer is used as a medium. A polycrystal is taken as an upper pole plate. A contact hole and metal in the original MOS process are used to make the upper pole plate of the capacitor be connected with the drain electrode of the MOS structure, and the lower pole plate be connected with the substrate of the MOS structure. Parallel connection with the original output capacitor CDS of the MOS structure is realized so as to change a capacitance value of an actual output capacitance, which means that an impressed frequency is changed and a condition of generating resonance with a power frequency (50Hz) can not be satisfied. Therefore, a final purpose of avoiding generating the resonance during the reliability test is reached.

The invention provides a position sensor and a changeable capacitance module of the same. The position sensor comprises the changeable capacitance module and a circuit board. The changeable capacitance module comprises a baseplate and a dielectric coupling substance, wherein the baseplate comprises a baseplate body, a grounding electrode and two power source electrodes; the grounding electrode and the two power source electrodes are disposed on the baseplate body; the power source electrodes are disposed on the other side at an interval; the dielectric coupling substance and the two power source electrodes are set at an interval and the dielectric coupling substance is used to move along an action path. When the dielectric coupling substance moves along the action path, covering conditions for the dielectric coupling substance to cover the two power source electrodes and the grounding electrode will be changed. When a power source supplies power to the two power source electrodes in an alternating manner, a pair of alternating capacitance values sensed by a capacitance sensing circuit will vary with changes of the covering position, so that a relative position of the dielectric coupling substance on the action patch and the circuit board can be defined. According to the invention, the capacitance value is changed through changes of the covering rate of electrode coverage of the dielectric coupling substance.

The invention discloses a fluorescent lamp dimming circuit and an operating method thereof. The dimming circuit comprises a main circuit, an auxiliary power supply module, a singlechip control module and a driving module. An input power supply Vac is connected with input of the auxiliary power supply module, output of the auxiliary power supply module is connected with power input ends of the singlechip control module and the driving module, the singlechip control module samples input voltage of the main circuit, voltage across both ends of a fluorescent lamp and voltage across both ends of a first capacitor, input of the driving module is connected with a driving signal end of the singlechip control module, and output of the driving module is connected with four switching tubes in the main circuit. The operating method is that a singlechip controls on-off of the four switching tubes according to requirements in adjusting the brightness of the fluorescent lamp so as to change the capacitance across both ends of the first capacitor, thereby changing the voltage across both ends of the fluorescent lamp. The fluorescent lamp dimming circuit and the operating method thereof are mainly used for adjusting the fluorescent lamp under the condition that the power is very low so as to enable the fluorescent lamp not to be completely turned off.

The invention discloses a pressure sensor and a preparation method of the pressure sensor. The pressure sensor comprises a first substrate and a second substrate, wherein a first electrode and a second electrode which are mutually independent are arranged on the first substrate; a public electrode is arranged on the second substrate; orthographic projection of the first electrode and the orthographic projection of the second electrode on the second substrate both are at least partially overlapped with the orthographic projection of the public electrode on the second substrate; a fluid medium is packaged between the first substrate and the second substrate, the first electrode can form a first capacitor with the fluid medium and the public electrode, the second electrode can form a second capacitor with the fluid medium and the public electrode, and the fluid medium can flow between the first capacitor and the second capacitor under the action of an external force. The sensor provided by the invention cannot generate abrasion of devices, cannot cause a problem of reduction of service life of the devices, meanwhile, devices used for the sensor are simple, so, production cost is reduced.

The invention relates to a car brake pad abrasion thickness detecting structure and a car brake pad active returning structure. A first end of a first rod body of the car brake pad abrasion thicknessdetecting structure is fixedly connected with a first pole plate, a second end of a second rod body is fixedly connected with a second pole plate, a second end of the first rod body is fixedly connected with a first brake pad on a first side of a brake disc, and a second end of the second rod body is fixedly connected with a second brake pad on a second side of the brake disc. When the car brake pad abrasion thickness detecting structure is used for car braking, due to the thickness abrasion of the first brake pad and / or the second brake pad, the rotating angles of the first rod body and the second rod body are changed, the opposite area between the first pole plate and the second pole plate is changed, and therefore the capacitance values of the first pole plate and the second pole plateare changed. Thus, the thickness abrasion loss of the first brake pad and / or the second brake pad can be judged according to the capacitance values of the first pole plate and the second pole plate, and the effect of detecting the thickness abrasion loss of the first brake pad and / or the second brake pad in real time is realized.

The invention relates to a pressure sensor and a preparation method thereof. The sensor comprises a dielectric layer, and a first electrode layer and a second electrode layer which are arranged on twoopposite sides of the dielectric layer, wherein the dielectric layer comprises a base body layer and a plurality of pore channels distributed in the base body layer, the pore channels are communicated with the outside so that air in the pore channels can be exhausted and sucked in, and piezoelectric film layers are further attached to the pore walls of the pore channels. According to the pressuresensor, through combination of the holes and the piezoelectric film layers, the detection sensitivity is higher. Meanwhile, the invention further provides a preparation method of the pressure sensor,and the preparation method is simple and suitable for industrial production.

The invention discloses a variable capacitor and a production method thereof. The variable capacitor comprises a soft upper diaphragm, a separator and a soft lower diaphragm which are sequentially stacked, dielectric with a high dielectric constant is arranged between the upper diaphragm and the lower diaphragm, an upper circuit is arranged on one side of the upper diaphragm opposite to the dielectric, the head end of the upper circuit corresponds to the size and the position of the dielectric, a lower circuit is arranged on one side of the lower diaphragm opposite to the dielectric, the head end of the lower circuit corresponds to the size and the position of the dielectric, and the separator is arranged on the side face or the edge of the upper surface of the dielectric, so that the dielectric is separated from the head end of the upper circuit. As the dielectric is arranged between the two circuits, capacitance is changed by changing stress, initial capacitance is zero and is changed under the action of external force, and the variable capacitor is simple in structure and production process and high in reliability.

The invention discloses a combination switch which is used on an automobile. The combination switch is characterized in that a parallel plate capacitor is composed of two electrodes on a circuit control board, an insulation slide block can slide into a space between the two electrodes, the insulation slide block is connected with a deflector rod, the deflector rod drives the insulation slide block to slide between the two electrodes so as to change capacitance value of the parallel plate capacitor and measure the capacitance value, a function corresponding to the capacitance value of a current gear position of the deflector rod is achieved by correlating the capacitance value obtained through measurement with a preset function threshold, and functions of the combination switch can be achieved through a non-contact mode.

The invention relates to a performance test device of a mixed-type direct-current solid-state breaker, and belongs to the field of high voltage and large current experiments. The performance test device comprises a rectifier, a charging capacitor set, a high-speed camera, a displacement sensor, an oscilloscope, a high-voltage differential probe, a current divider and the like. By means of changes of the number of capacitors in series-parallel connection, a capacitance value of the capacitor set is changed. The high-speed camera is connected with a computer and is used for shooting the motion process of a quick mechanical switch contact and a pull rod in the switching-off and switching-on processes. The displacement sensor is used for measuring the motion speed of a quick mechanical switch pull rod and a contact. The current divider is used for measuring currents flowing through a discharging circuit, a power electronic branch circuit, a buffer and a voltage limiter. The high-voltage differential probe is used for testing the serial-connection voltage sharing effect of each power electronic component. The oscilloscope is used for displaying a test result. The performance test device meets requirements for different parameters in the development process of the mixed-type direct-current solid-state breaker and provides a quantization basis for work performance analysis.

The invention discloses a children seat ring, an intelligent toilet lid and an intelligent toilet, wherein the children seat ring is erected on a conventional seat ring of the intelligent toilet; theconventional seat ring is provided with a capacitance change induction device; the children seat ring is provided with a capacitance induction triggering part relative to the capacitance change induction device of the conventional seat ring; and the capacitance change rate of the capacitance change induction device reaches a trigger threshold when the distance from the capacitance induction triggering part to the capacitance change induction device is smaller than a preset distance. Due to the adoption of the children seat ring with the structure, the distance from the capacitance induction triggering part to the capacitance change induction device is smaller than the preset distance when children sit, so that the capacitance value of the capacitance change induction device is changed, thechange rate of the capacitance change induction device reaches the trigger threshold, and furthermore, a human body sitting induction function of the conventional seat ring is triggered.

The embodiment of the invention discloses a plasma inductance coil structure. The magnetic field intensity generated by a first part of an inductance coil is greater than the magnetic field intensity generated by a second part of the inductance coil, so that the inductance coil forms an asymmetric magnetic field. The projection of the first part of the first inductance coil in the preset plane and the projection of the second part of the second inductance coil in the preset plane in the at least two inductance coils are at least partially overlapped in the first direction so as to compensate the magnitude of the magnetic field intensity generated by the second part of the second inductance coil; meanwhile, the projection of the second part of the first inductance coil in the preset plane and the projection of the first part of the second inductance coil in the preset plane are at least partially overlapped in the first direction so as to compensate the magnitude of the magnetic field intensity generated by the second part of the first inductance coil; and at least one of the first capacitor electrically connected with the first inductance coil and the second capacitor electrically connected with the second inductance coil is an adjustable capacitor, so that the phenomenon of non-uniform etching is solved.

The invention discloses a frequency modulation screw rod structure used for a cavity filter. The frequency modulation screw rod structure can be disposed on the cover plate of the cavity filter, and is fixedly connected with the cover plate of the cavity filter, and comprises a screw rod; a coupling disc connected with the screw rod; and a resonant rod, which can be fixedly disposed in the housing of the cavity filter. The axis of the screw rod is parallel to the axis of the coupling disc, and a certain distance is arranged between the axis of the screw rod and the axis of the coupling disc. The invention also discloses the cavity filter. By adopting the cavity filter and the frequency modulation screw rod structure thereof, the debugging operation can be reduced, and the screw types can be reduced; the adjusting range can be increased, and the filter debugging efficiency can be increased.

The invention discloses a capacitive pressure sensor, which is suitable for the sensor field. It includes a substrate and a cover plate. The substrate includes a top layer, a bottom layer and an insulating layer. So that the groove forms a vacuum cavity, and the bottom of the groove forms a pressure-sensitive film, and the top layer is provided with a movable interdigital capacitor and a fixed interdigital capacitor, which are arranged staggered and equidistant from each other, and the movable interdigital capacitor passes through. The insulating layer directly under it is attached to the pressure-sensitive film, and the insulating layer directly under the fixed interdigital capacitor is suspended between the bottom layer and the fixed interdigital capacitor. The embodiment of the present invention also discloses a preparation method and a pressure measurement device of a capacitive pressure sensor. When the pressure-sensitive film is deformed by force, the facing area between the movable interdigital capacitor and the fixed interdigital capacitor can be adjusted. It has good linear output, and at the same time, the vacuum tightness is good, which can avoid the extraction of electrodes in the vacuum cavity.

The invention provides a liquid crystal display panel which comprises an array substrate and a color film substrate. The array substrate is provided with substrate routing and multiple gate pole chip on films, the surface of the color film substrate is provided with a common electrode layer which covers the substrate routing area and is of a hollowed-out structure, and then the area of the common electrode layer projected on the array substrate fringe area is reduced, so that a capacitance value between the common electrode layer and the substrate routing is adjusted. The liquid crystal display panel and the display device have the advantages that for the liquid crystal display panel, the capacitance value between the common electrode layer and the substrate routing is changed through the hollowed-out structure of the common electrode layer, a capacitance value difference is offset, and the technical problem that due to the fact that a difference caused by the capacitance value difference exists in voltage input into the panel, the display phenomenon of being poor in horizontal block is solved.

The invention provides a wireless communicator. The wireless communicator comprises a first antenna, a second antenna, a processor, an adjusting unit and a matching circuit, wherein the processor is electrically connected with the adjusting unit, the adjusting unit is electrically connected with the first antenna through the matching circuit, and the processor is used for outputting high or low level according to strength of received signals of the second antenna so as to change or maintain circuit parameters of the adjusting unit, so that the adjusting unit and the matching circuit jointly adjust impedance of the first antenna. The wireless communicator can effectively improve isolation degree of the antenna.

The invention relates to frequency selection surfaces, in particular to an interelement strong coupling ultra-wide range-adjustable active frequency selection surface. A variable capacitance diode is directly loaded with bias voltage to change the capacitance value of the variable capacitance diode, and meanwhile interelement strong coupling is utilized for achieving moving of the whole structure in a resonance frequency ultra-wide range. A dielectric slab, metal layers, the variable capacitance diode and an inductor are arranged. The metal layers, the variable capacitance diode and the inductor are arranged on the front surface of the dielectric slab, the metal layers are vertical strip-shaped metal layers, the vertical strip-shaped metal layers are loaded with two horizontal strip-shaped metal layers with different lengths in the horizontal direction, and the distance between the vertical strip-shaped metal layers and the two horizontal strip-shaped metal layers with the different lengths is half of the length of the long strip-shaped metal layer in the two horizontal strip-shaped metal layers with the different lengths. The two horizontal strip-shaped metal layers with the different lengths are connected through the variable capacitance diode, the vertical strip-shaped metal layers are connected through the inductor, and the vertical strip-shaped metal layers are in seamless connection with the horizontal strip-shaped metal layers.

The invention discloses a capacitive touch panel. The framework comprises two axial electric conduction groups, wherein each electric conduction group consists of a plurality of electric conduction units connected by a conductor; the electric conduction groups of different axial directions are isolated by insulation materials; the adjacent electric conduction units of different axial directions generate an electric field and induction capacitance when a control signal is provided; and a touch position is detected. The capacitive touch panel provided by the invention furthermore comprises a plurality of suspension induction units, wherein each suspension induction unit is distributed between the adjacent electric conduction units. The suspension induction units can generate new induction capacitance without being connected by the conductor or providedwith signals, and the capacitive touch panel has the advantages that induction fields are evenly distributed and a touch induction area is enlarged.