42 results about "Energy trapping" patented technology

A piezoelectric energy captor enabling to capture energy and store energy effectively consists of piezoelectric beam formed by two layers of piezoelectric ceramic plates and intermediate sandwich layer, electrode prepared by plating metal silver on ceramic plate, inductance coil with control switch, bridge type of rectifier, rectifying capacitor, Cuk type of dc-dc converter formed by transistor switch and electric inductance as well as diode, filtering capacitor for stabilizing charge current, and energy storing battery.

An energy trapping type piezoelectric filter having a minimal surface area comprises a first and second identical piezoelectric substrates 10a and 10b being laid one on the other to form a multilayer structure, each having a first surface provided with a pair of oscillatory electrodes 11 and 12 arranged vis-a-vis relative to each other and a capacitor electrode 14 which is connected to one of the oscillatory electrodes 12, the other oscillatory electrode 11 being electrically connected to an input/output connection terminal 13 also arranged on the first surface, and a second surface provided with a common electrode 16 arranged oppositely relative to said pair of oscillatory electrodes 11 and 12 and a capacitor electrode 17 arranged opposite to said capacitor electrode 14, the capacitor electrode 17 and the common electrode 16 being electrically connected to each other, the pair of oscillatory electrodes 11 and 12 and the common electrode 16 forming an oscillating section V, the capacitor electrodes 14 and 17 forming a coupling capacitor C1 (C2). The energy trapping type piezoelectric filter further may comprise a shield electrode means 19 and 34 for any electromagnetic coupling of a pair of input/output electrodes and/or terminals.

The invention provides an intelligent type MPPT (maximum power point tracking) wind energy controller which comprises a slip form extremum search module and a blur parameter setting module, wherein the parameter of the slip form extremum search module is adjusted according to the output of the blur parameter setting module; the slip form extremum search module comprises a comparing unit, a switching unit and two integrators, and the blur parameter setting module comprises a fuzzy controller; and the parameter of the switching unit is set by the output of the fuzzy controller, and the input of the fuzzy controller is a power tracking error e and wind speed V of a wind power system. The wind energy controller provided by the invention can provide an optima rotation rate reference value for realizing maximize wind energy trapping of the wind power system, and can effectively restrain the neighbouring system disturbance of a maximum power.

To provide an elastic wave device that is small sized and in which a frequency fluctuation due to a change with time hardly occurs, and an electronic component using the above elastic wave device. A trapping energy mode portion 2 provided in an elastic wave waveguide 10 made of an elastic body material excites a second elastic wave being an elastic wave in an energy trapping mode by a specific frequency component included in a first elastic wave being an elastic wave in a zero-order propagation mode propagated from a first propagation mode portion 4, and a cutoff portion 3 provided in a peripheral region of the trapping energy mode portion 2 has a cutoff frequency being a frequency higher than that of the second elastic wave. A second propagation mode portion mode-converts the second elastic wave leaked through the cutoff portion to a third elastic wave being the elastic wave in the zero-order propagation mode to propagate the third elastic wave.

The invention relates to an energy trapping device, in particular to a piezoelectric energy trapping device, which comprises a piezoelectric bimorph cantilever, a rectifying circuit, a direct current (DC)-DC regulation circuit, an energy storage element and a conducting wire, wherein an alternating current which is generated by the piezoelectric bimorph cantilever is converted into a DC through the rectifying circuit; and the DC which is obtained by impedance matching of the DC-DC regulation circuit supplies power to a load. By regulating the duty ratio of a metal oxide semiconductor field effect transistor (MOSFET) in the DC-DC regulation circuit, the average input resistance of a DC converter can be regulated, so that the impedance matching of piezoelectric energy trapping elements is realized, and the output power of the piezoelectric energy trapping device is improved.

The invention discloses a composite nonlinear energy trapping vibration damper. Two nonlinear tracks of the composite nonlinear energy trapping vibration damper are separately crossed in the X direction and the Y direction. A tubular track in the X direction is arranged on a bottom layer, and a tubular track in the Y direction is arranged on an upper layer. When two balls separately roll in respective pipes, reactive force which is compounded theoretically can point to an optional direction in a three-dimensional space, and complicated vibration damping requirements for the vibration damper inwork can be met. Stopping covers which are fixedly provided with high-damping rubber are separately mounted at two ends of each track, and thus, energy dissipation during impacting is enhanced. In addition, a permanent magnet is embedded in the balls, and when the balls roll in the pipes, a movable magnetic field can be formed. When the movable magnetic field is intersected with the metal pipes,mutual cutting of a magnetic induction line and a conductor is caused, thus, eddy current is generated in the metal pipes, electromagnetic force generated by the eddy current can be equivalent to a viscous damping, and thus, energy is dissipated by an electromagnetic effect.

To provide an elastic wave device that is small sized and in which a frequency fluctuation due to a change with time hardly occurs, and an electronic component using the above elastic wave device. A trapping energy mode portion 2 provided in an elastic wave waveguide 10 made of an elastic body material excites a second elastic wave being an elastic wave in an energy trapping mode by a specific frequency component included in a first elastic wave being an elastic wave in a first or higher-order propagation mode propagated from a first propagation mode portion 4, and a cutoff portion 3 provided in a peripheral region of the trapping energy mode portion 2 has a cutoff frequency being a frequency higher than that of the second elastic wave. A second propagation mode portion mode-converts the second elastic wave leaked through the cutoff portion to a third elastic wave being the elastic wave in the propagation mode to propagate the third elastic wave.

The invention discloses a novel piezoelectric quartz wafer with a dual-convex structure. The novel piezoelectric quartz wafer comprises a central member (1), a protection frame (2) and connection parts (3), wherein a die cavity is formed in the protection frame (2); the top surface of the central member (1) is provided with a boss I (4); the bottom surface of the central member (1) is provided with a boss II (5); straight slots A (6) are formed between the two long edges of the protection frame (2) and the two long edges of the central member (1); straight slots B (7) are formed between the two short edges of the protection frame (2) and the two short edges of the central member (1); the straight slots A (6) are communicated with the straight slots B (7); and the connection parts (3) are arranged in any straight slot B (7). The invention has the beneficial effects that small-sized quartz wafers can be produced in batches; parasitic vibration generated on edges is weakened; the energy trapping effect in the center of the quartz wafer can be enhanced; the machining accuracy is increased; and the consistence of a product is improved greatly.

The invention discloses a piezoelectric energy trapping and detecting method based on external forced vibration. According to the method, by means of adoption of a beam and slab structure and a simple support supporting mode, energy trapping for piezoelectrics is achieved by forced vibration. The method includes: firstly, converting forced vibration mechanical energy into alternating-current signals according to a piezoelectric effect; then, utilizing a full-bridge rectification circuit for rectifying the alternating-current signals; finally, utilizing a capacitance filtering circuit for achieving stable direct current output. According to design, a switching circuit with a light-emitting diode and an oscilloscope is provided for achieving qualitative and quantitative detection of an energy trapping process. The piezoelectric energy trapping and detecting method based on external forced vibration has the advantages that detection is simple, convenient and accurate, energy trapping is simple and stable in supporting, dependency on vibration frequencies of external vibration sources is weak, and the method is promising in application prospect on the aspect of self-energy-supply of low-energy-consumption electronic devices.

High-yield fabrication methods are provided for making quartz resonators having thicknesses ranging from one micrometer to several hundred micrometers and thus covering the frequency range from HF to UHF. Plasma dry etching is used to form arbitrary resonator geometries. The quartz resonator structure and the through-quartz vias are formed concurrently. The method includes bonding a quartz device wafer to a quartz handle wafer with a temporary adhesive. Mesa structures formed by plasma dry etching enable the resonators to achieve high-Q operation with energy trapping/mode confinement. A thermo-compression bond integrates the quartz resonators to a host wafer (e.g., an oscillator ASIC) to form oscillators. Silicon cap wafers are bonded over the resonators to the ASIC to provide wafer scale hermetic encapsulation of the quartz oscillators.

The invention belongs to the technical field of luminescent materials and particularly relates to erbium ion sensitized upconversion phosphor as well as a preparation method and an application thereof. According to the upconversion phosphor, NaLuF4 is taken as a substrate, Tm<3+> and Ho<3+> are taken as energy trapping centers, and Er<3+> is taken as sensitization ions and activation ions. Er<3+>is taken as the sensitization ions and the activation ions simultaneously in a high Er<3+> doping manner, and red upconversion luminescence with high impurity can be obtained. Doping concentration ofEr<3+> can be reduced by adopting Tm<3+> and Ho<3+> as the energy trapping centers simultaneously, so that the probability of concentration quenching is reduced effectively, and red upconversion luminescence with high purity, high intensity and high red-green ratio is realized more easily. The preparation process of the upconversion phosphor is simple, short in period, easy to operate, pollution-free and suitable for large-scale production, and equipment cost is low. The obtained upconversion phosphor has broad application prospect in the fields of bioimaging, solar cells, solid lasers, devicedisplay and the like.

The invention provides a preparation method and application of silicon-carbon quantum dots. The preparation method of the silicon carbon quantum dots (SiCDs) comprises the following steps: firstly, dissolving citric acid and cysteine in deionized water, carrying out ultrasonic dissolution, and carrying out nitrogen bubbling; injecting 3-aminopropyltriethoxysilane into the nitrogen-saturated precursor solution, transferring the obtained solution into a stainless steel autoclave with a polytetrafluoroethylene lining, and conducting incubation for 2 h at the temperature of 200 DEG C; and after cooling to room temperature, purifying the obtained mixture through a dialysis bag to obtain a SiCDs solution. According to the invention, an off-on fluorescence sensor is ingeniously designed by applying the SiCDs to detect the Vc, the fluorescence of the SiCDs can be quenched by Fe<3+> through IFE and PET, the Vc can recover an energy trap caused by a redox reaction and -NH2/-OH exposure, and the new strategy based on the off-on of the effective fluorescence can be used for detecting the Vc.

The invention discloses a QCM (quartz crystal microbalance) sensor with high-quality factor and high-quality sensitivity. A resonant bottom plate with an inverted desk type circular groove in a single surface is adopted, the quality of the peripheral region (a circular ring-shaped platform) of the circular groove of the resonant bottom plate is improved, the layout of an upper metal electrode comprising a circular ring-shaped electrode covering the surface of the circular ring-shaped platform and a circular electrode covering the surface of the circular groove is adopted, and the circular ring-shaped electrode is communicated with the circular electrode through metal conductors, so that an energy trapping effect and an energy concentration effect are improved and the quality factor of the QCM sensor is improved. Meanwhile, the purpose of improving the quality sensitivity of the QCM sensor is achieved by reducing the thickness of partial effective resonant region.

The invention provides a sliding electrostatic energy trapping device for human heart beating. The energy trapping device is applied to the collecting of the energy of human heart beating. The energytrapping device comprises two energy trapping parts and an attachment part. The energy trapping part comprises an inner substrate, an outer substrate and a dielectric material layer arranged on the surface of the substrate. The dielectric material layers on the inner and outer substrate surfaces are in contact with each other and have opposite polarities. The dynamic signals of heart beating are transmitted to the energy trapping units through the attachment unit, so that friction occurs between the dielectric material layers on the surface of the inner and outer substrates, positive and negative charges are generated respectively, and potential energy is formed and input to the implantable electronic equipment. The invention has the advantages of long service life, easy integration with other processing processes and high energy conversion rate.

The invention discloses a piezoelectric quartz crystal wafer with a single convex structure. The piezoelectric quartz crystal wafer comprises a central component (1), a protecting frame (2) and a connecting part (3). A cavity is arranged in the protecting frame (2); the central component (1) is arranged in the cavity; a boss (4) is arranged at the top surface of the central component (1); through grooves A (5) are formed among the two long sides of the protecting frame (2) and the two long sides of the central component (1); through grooves B (6) are formed among the two short sides of the protecting frame (2) and the two short sides of the central component (1); the through grooves A (5) are communicated with the through grooves B (6). The connecting part (3) is arranged at any one of the through groove B (6). The piezoelectric quartz crystal wafer of the invention has the following benefits: the piezoelectric quartz crystal wafer of the invention could be used for performing batch production to the small quartz crystal wafer, weakening parasitic vibration generated by the edge, and strengthening energy trapping effect of the centre of the quartz crystal wafer, thereby improving working accuracy and greatly improving consistency of the product.

The embodiment of the invention discloses a surface acoustic wave resonator and a filter. The resonator comprises a supporting layer, an energy trap layer, a temperature compensation layer, a piezoelectric layer and an interdigital transducer layer which are sequentially stacked, the interdigital transducer layer comprises a plurality of interdigital transducers, the material of the piezoelectric layer comprises X-40Y lithium niobate, the acoustic bulk wave propagation velocity of the support layer is greater than the acoustic surface wave propagation velocity of the piezoelectric layer, and the energy trap layer is used for capturing parasitic charges on the surface of the support layer to improve the Q value of the acoustic surface wave resonator. According to the embodiment of the invention, the piezoelectric layer and the supporting layer of the resonator are improved, and the speed of transmitting sound waves by X-40Y lithium niobate is relatively high, so that the working frequency of the resonator is greatly improved and reaches 5G and more than 5G; the acoustic bulk wave propagation speed of the supporting layer is greater than that of the surface acoustic wave propagation speed of the piezoelectric layer, energy is limited on the surface, and bulk wave leakage is avoided, so that the device loss is reduced; the energy trap layer can improve the Q value to enhance the stability of the surface acoustic wave resonator.

A piezoelectric resonator for suppressing energy, thickness shear, the piezoelectric substrate (1) having a width W set equal to or less than about 0.7mm, and satisfying the following expressions (a) and (c) or (b) and (c ): (a)(b)(c). Among them, T represents the thickness of the piezoelectric substrate; k is 1/2; f _osc is equal to fa(1-α); f _osc Represents the oscillation frequency of the resonator; fa represents the anti-resonance frequency of the resonator; fr represents the resonant frequency of the resonator; α is a constant; n represents a positive integer.