30results about How to "Stable capacitance value" patented technology

A variable capacitor device using MEMS or micromachining techniques wherein thin-films of materials are deposited, patterned and etched to form movable micromechanical elements on the surface of a substrate composed of either semiconductor, glass, metal, or ceramic material. In one embodiment of the present invention to achieve higher frequency performance as well as other benefits, the substrate is comprised of Low-Temperature Co-Fired Ceramics (LTCC). The variable capacitor is an electrostatically actuated micromechanical device and if fabricated on a LTCC multi-layered substrate material has continuous electrical connections through the layers. The same LTCC substrate material can also be used to enclose the device by selectively removing a portion of the upper substrate so as to form a cavity. The two substrates are then bonded together to enclose and protect the variable capacitor. An integrated circuit can be incorporation onto the multi-level substrate structure to enable a electronic closed-loop controlled variable capacitor module. The integrated circuit is flip-chip bonded at the bottom of the substrate structure with appropriate electrical connections between the integrated circuit and the MEMS variable capacitor device. A variation of the present invention utilizes a zipper actuation method wherein the tuning ratio of the variable capacitor is increased to very high levels. Yet another variation of the present invention utilizes a differential gap between the top and bottom electrodes such that the actuation electrodes do not physically contact one another. Yet another implementation of the present invention uses an extra set of electrodes or mechanical mechanism so as to lock the value of the capacitor indefinitely. Yet another implementation uses shaped actuation electrodes so as to linearize the relationship between the applied actuation voltage and the resultant capacitance of the device.

The inventionprovides a positive plate used for a lead-acid storage battery. The positive plate comprises an alloy plate grid and lead-acid layers coating two surfaces of the alloy plate grid, wherein the alloy plate grid is prepared from the following components in percentage by weight: 0.05-0.2% of calcium, 0.6-1.0% of tin, 0.01-0.05% of aluminum and the balance of lead;each lead-acid layer is mainly prepared from the following components in parts by weight: 950-1050 parts of lead powder, 100-110 parts of water and 90-100 parts of sulfuric acid in the specification of 1.4g/cm3. The lead-acid storage battery with the positive platehas the advantages of good heavy-current discharge stability, highlow-temperature start capacity, excellentanti-corrosion performance, longcirculating charge and discharge life and excellent comprehensive performance.

A variable capacitor device is disclosed in which the capacitive tuning ratio and quality factor are increased to very high levels, and in which the capacitance value of the device is tuned and held to a desired value with a high level of accuracy and precision using a laser micromachining tuning process on suitably designed and fabricated capacitor devices. The tuning of the variable capacitor devices can be performed open-loop or closed-loop, depending on the precision of the eventual capacitor value needed or desired. Furthermore, the tuning to a pre-determined value can be performed before the variable capacitor device is connected to a circuit, or alternatively, the tuning to a desired value can be performed after the variable capacitor device has been connected into a circuit.

The present invention provides a composite humidity sensitive material used for a capacitive humidity sensor and a sensor preparation method, the formula of the composite humidity sensitive material is as follows: mixing titanium oxide or barium titanate with barium strontium titanate in the mass ratio of 1:1-1:3 to obtain an initial functional ceramic material, mixing polyamide or polytetrafluoroethylene with the initial functional ceramic material in the mass ratio of 0.3wt%-0.5wt% to obtain a mixture; and mixing an inert metal with the mixture in the mass ratio of 15wt%-25wt%. A composite humidity sensitive film is prepared by an aerosol deposition technology from the composite humidity sensitive material, and the capacitive humidity sensor is prepared from the film by a semiconductor processing technology. The sensor has high precision, high stability, heat resistance, pollution prevention and high reliability.

The invention discloses a self-repairing method for a PT intelligent blocking device, and relates to the technical field of blocking devices. By redesigning a miniature capacitor plate circuit on an internal thin film of a main body capacitor of the PT intelligent blocking device, after a certain main body miniature capacitor in the miniature capacitor plate circuit is broken down, the main body capacitance value of the miniature capacitor plate circuit is kept stable; and when the capacitance value of the PT intelligent blocking device cannot be kept stable after the PT intelligent blocking device breaks down, the main body capacitance value of the broken-down PT intelligent blocking device is adjusted through an intelligent algorithm, and then the capacitance value of the PT blocking device can be kept stable all the time and cannot deviate. The problem that the capacitance value of a main body capacitance value in an existing PT intelligent blocking device drifts due to the fact that part of miniature capacitors inside are damaged is solved.

The invention discloses a preparation method of a graphene/poly(1,3,6,8-tetrathiophenepyrene) nano-scroll composite material. The method comprises the steps: mixing poly(1,3,6,8-tetrathiophenepyrene) and oxidized graphene, and preparing a nano-scroll structure through in-situ reduction, wherein the nano-scroll structure can serve as an electrode material of a supercapacitor. The invention relates to the preparation of the graphene/poly(1,3,6,8-tetrathiophenepyrene) nano-scroll composite material. The material serves as the electrode material of the supercapacitor, so a higher specific capacitance value can be obtained. The method is simple, and the working state is stable and reliable, so the method is worthy of being discloses and protected.

The invention discloses a cable foaming layer nitrogen charging control method and system, and the method comprises the steps: obtaining a detection image during the nitrogen charging of a core wire through X-ray flaw detection equipment in real time in the nitrogen charging process of the core wire processing of a cable; recognizing the foaming layer image of the cable in the detection image, calculating the uniformity of the foaming layer image during nitrogen charging, and adjusting the nitrogen charging speed according to the uniformity, so the thickness uniformity of the foaming layer can be moderate by intelligently controlling the nitrogen charging speed and air pressure, the capacitance value of the cable is stable, the transmission bandwidth and the transmission rate of the produced cable are ensured, and the stability of data transmission meets the technical requirements of high-speed transmission and information exchange, so that the produced cable has uniform transmission impedance.

The invention provides an electronic communication system for basketball fouls. The electronic communication system comprises a special basketball, and the surface of the special basketball is made of electroconductive rubber. The electronic communication system further comprises numbered sensing rings put on the wrists of players. Each sensing ring comprises a capacitor, wherein a first electrode of the capacitor is close to the skin of the human body, and a second electrode is not in contact with the skin of the human body. Each sensing ring further comprises a capacitance measuring module for the corresponding capacitor. After sensing a capacitance pulse, each capacitance measuring module sends a pulse signal containing the number of the sensing ring to a public judgment server in a competition venue through a wireless communication module in the sensing ring. The system can accurately judge the foul players causing out in time under the situation that the basketball is out, and the judgment difficulty can be greatly reduced.

The invention discloses a small-aperture capacitive electromagnetic flow sensor. The sensor comprises a shell, and a measuring guide pipe, a control device, an excitation circuit, an excitation coil,a signal electrode, a signal amplifier, a digital-to-analog converter and a power supply which are arranged in a cavity of the shell, wherein the excitation coil is arranged outside the measuring guide pipe, the excitation circuit is respectively connected with the excitation coil and the power supply, the measuring guide pipe is connected with the control device through the signal electrode, thesignal amplifier and the digital-to-analog converter. The sensor is advantaged in that the sensor belongs to a capacitive structure, the high-temperature co-fired multi-layer ceramic technology is creatively applied to the small-aperture measuring guide pipe, a capacitance value between a shielding layer and an electrode layer is stable and reliable, the induction capacitance value can be greatlyimproved, and compared with a capacitive measuring guide pipe with a conventional bonding electrode, the measuring guide pipe is higher in size precision, good in capacitance consistency, resistant tohigh temperature, resistant to vibration and resistant to corrosion.