32results about How to "Increase the output amplitude" patented technology

A display apparatus is disclosed. The display apparatus includes a display panel, a piezoelectric vibration unit attached to a rear surface of the display panel, and a member attached to at least oneof a rear surface of the piezoelectric vibration unit and a portion of the rear surface of the display panel that surrounds the piezoelectric vibration unit. The display apparatus includes a display panel, a damping member attached to a rear surface of the display panel, and a piezoelectric vibration unit attached to a rear surface of the damping member.

The invention relates to a multi-position automatic detection system of an intelligent power distribution terminal and a detection method of the multi-position automatic detection system. The system comprises a test module, an analog quantity signal output unit, a switch quantity unit, a multi-position detection work bench, a direct-current power supply, an alternating current power supply and a data management module. According to the invention, comprehensive and automatic function and performance test of the power distribution terminal device is achieved; tests in multiple aspects of communication, telemetering, remote communication, remote control, influence quantity and reclosure of the power distribution terminal are related; automation degree is high; test efficiency is high; and safety is high.

The invention relates to a short-wave pre-and-post-selector, which comprises a digital control circuit, transmitting-receiving switching circuits, band switching circuits, frequency hopping filters, a decoder, a broadband low noise amplifier and a receiving protection circuit, wherein the digital control circuit is electrically connected with an external short-wave radio station control unit through a control interface; serial codes sent by the short-wave radio station control unit are received by the digital control circuit and converted into parallel tuning codes respectively used for controlling the frequency hopping filters, the band switching circuits and the transmitting-receiving switching circuits so as to realize transmission on carrier signals different in frequency point and rapidly perform switching on carrier frequencies of useful signals; the transmitting-receiving switching circuits comprise a first transmitting-receiving switching circuit, a second transmitting-receiving switching circuit, a third transmitting-receiving switching circuit and a fourth transmitting-receiving switching circuit; the band switching circuits comprise a first band switching circuit and a second band switching circuit; the frequency hopping filters comprise a first frequency hopping filter and a second frequency hopping filter. The short-wave pre-and-post-selector disclosed by the invention has the advantages of being reasonable in structure, stable and reliable to use, strong in anti-jamming capability, low in cost, simple to control, fast in frequency hopping speed, low in power consumption, small in bottom noise and the like.

The invention discloses a composite array magnetoelectric transducer adopting a magnetostriction and piezoelectric material of a poly-energy accumulator, which consists of a fixing rod and a plurality of variable amplitude resonance structures, wherein the resonance frequencies of the variable amplitude resonance structures are different; the gravity center of each variable amplitude resonance structure is fixed on the fixing rod, the fixing directions of the variable amplitude resonance structures are same, and longitudinal gravity center lines of the variable amplitude resonance structure are on the same straight line; and each device is insulated with others. The invention has the technical effect of providing a magnetoelectric transducer which can broaden the output frequency band width, improve the output amplitude and reduce the energy conversion loss.

The invention discloses a reconfigurable microwave receiver front-end based on a micro-electro-mechanical microwave power sensor, wherein the self detection function of an online-type MEMS (Micro Electro Mechanical System) microwave power sensor is adopted to convert microwave power, which is partially coupled by an MEMS membrane bridge, into direct current level, the direct current level applies online control to a preprocessor capable of attenuation and amplification so that the output of the front-end keeps stable when an MEMS microwave antenna receives too large or too small microwave signals, and simultaneously, the effect of protecting a low noise amplifier to prevent the low noise amplifier from overloading is achieved when the MEMS microwave antenna receives super large microwave signals suddenly; furthermore, a single microwave receiver front-end can work within a plurality of frequency bands through the MEMS microwave antenna and an MEMS adjustable wave filter, thereby the way that the traditional single microwave receiver front-end achieves the above function by a relatively complex AGC (Automatic Gain Control) module is replaced and the defect of single operating mode is overcome; and the front-end based on the MEMS technology has the characteristics of lower loss and small volume, etc.

The invention discloses a micro dynamic pressure generator based on liquid-gas pressure conversion and a working method of the micro dynamic pressure generator, belonging to the technical field of metering and testing. The micro dynamic pressure generator based on the liquid-gas pressure conversion is mainly composed of a vibration table controller, a vibration table body, a vibration table surface, a variable volume hydraulic cavity, a piston, a piston sleeve and a gas pressure chamber; the vibration table controller is connected with the vibration table body; the vibration table body is fixed on the vibration isolation foundation and is vertically fixedly connected with the vibrating table surface, and the vibrating table body pushes the vibrating table surface to move up and down; the variable volume hydraulic cavity is fixedly arranged on the vibration table surface. The invention also discloses a working method of the micro dynamic pressure generator based on liquid-gas pressure conversion. According to the micro dynamic pressure generator, the pressure amplitude generated by the micro dynamic pressure generator in medium and high frequency can be improved, and the influence of lateral displacement and vibration of the vibration table surface on the life of the piston can be reduced or eliminated. The micro dynamic pressure range means that the pulsating pressure of 0.1kPato 10kPa can be generated in an environment of absolute pressure of 20kPa to 300kPa.

The invention discloses a solid-state switch-based high-voltage pulse generator. The generator comprises an input power supply, a fast-closing tube of a circuit, at least one group of solid-stage switch module, a load resistor and a load capacitor, wherein one end of the fast-closing tube of the circuit is connected to a positive electrode of the input power supply, the other end of the fast-closing tube of the circuit is connected to an input end of the at least one group of solid-state switch, an output end of the at least one group of solid-state switch is connected to a negative electrodeof the input power supply, the solid-state switch module comprises an energy storage capacitor, an upper switch and a lower switch, and the upper switch and the lower switch are connected in series and then are connected in parallel with the energy storage capacitor; when only one group of solid-state switch module exists, one end of the load capacitor is connected between the upper switch and thelower switch of the solid-state switch module, and the other end of the load resistor is connected in series with the load capacitor and then is connected to a negative electrode of the input power supply; and when more than one group of solid-state switch modules exist, different solid-state switch modules are connected in parallel, and a protection diode is connected in series between input ends of adjacent solid-state switch modules.

A magnetic sensor includes a substrate, and a pattern forming region on the substrate, the pattern forming region having a substantially quadrangle shape. The pattern forming region includes a magnetic detection element pattern that includes a plurality of linear parts arranged parallel to each other at a predetermined inclination angle to two sides of the quadrangle shape, and a plurality of turning parts configured to alternately connect both end portions in a longitudinal direction of adjacent linear parts of the plurality of linear parts. The magnetic detection element pattern further includes a first pattern, and a second pattern with a resistance change ratio less than the first pattern. An area of the magnetic detection element pattern is less than an area of the pattern forming region in a plane view.