44results about How to "Change capacitance value" patented technology

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 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.

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 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 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 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 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 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.