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

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.

Provided is an ultrasonic horn, the output amplitude of which can be significantly increased. An ultrasonic horn includes an input-side end section that has an input surface that receives ultrasonic vibration, and an output-side end section having an output surface that outputs ultrasonic vibration to a sheet. The output-side end section has a dimension, in the length direction, over which a side edge portion of a front abdominal section and a side edge portion of a rear dorsal section can be welded in the longitudinal direction, and is branched in a width direction that is perpendicular to the length direction by a slit that extends in the length direction. A pair of surfaces of the output-side end section, positioned on both sides of the slit, functions as the output surface through which the ultrasonic vibration is output.

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 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 an adjustable high-voltage pulse generator applied to a mass spectrometer. The adjustable high-voltage pulse generator comprises a trigger pulse circuit, and two MOSFET high-voltage control circuits; the trigger pulse circuit comprises an external trigger circuit, an isolation circuit, and a CPLD control circuit, each MOSFET high-voltage control circuit comprises two groups of MOSFET drive circuits and drive power source thereof, two MOSFET combined circuits, one positive high-voltage input circuit, one negative high-voltage input circuit, two MOSEFT high-voltage output circuits, and an attenuation output circuit; each circuit is powered by a direct current power source. The high-voltage pulse generator disclosed by the invention is cheap in cost, reliable in performance, can be used for extracting ions and electrons in a pulse mode in the mass spectrometer, such as a flight time mass spectrometer system.

The invention discloses a method and device for testing a secondary system disturbance voltage of an extra high voltage substation and belongs to the field of power system substation electromagnetic compatibility. The method provided by the invention comprises the steps that a current injection point is connected with a positive end of an impulse current generator; a current backflow point is connected with a negative end of the impulse current generator; the impulse current generator passes a wave modulation resistor and a wave modulation inductor, then injects a current into the current injection point and measures a waveform of an impulse current; a control terminal controls a GPS satellite signal receiver to be connected with a collection card triggering channel, each test point is synchronously triggered and test information is collected; a position of a test backflow point of primary measurement is determined as the optimum backflow point; a disturbance voltage at a breaking partof a secondary cable is measured through utilization of a high voltage probe; the disturbance voltage measured by the high voltage probe passes a collection card and a photoelectric conversion deviceand is transmitted to the control terminal through utilization of a fiber, and the control terminal reads the disturbance voltage. According to the method and the device, workload of arranging lead wires when a test is carried out is reduced, and output amplitude of the impulse generator can be improved.

The invention discloses a multi-objective optimization method based on a genetic algorithm suitable for an MMC, which comprises the following steps: obtaining electrical parameters, obtaining capacitance value required by sub-module before optimization according to electrical parameters and set capacitance voltage maximum fluctuation rate epsilon; On the premise that the current level of the switching device is not improved before and after optimization, the constraint conditions of the bridge arm current before and after optimization are obtained. Based on the constraint conditions and electrical parameters, the Pareto solution set is obtained by genetic algorithm with the objective of minimizing the peak value of the bridge arm modulation voltage and the peak value of the capacitance voltage fluctuation of the sub-module. Taking the minimum peak value of bridge arm modulation voltage or the minimum peak value of capacitance voltage fluctuation of sub-module as the priority objective,the common-mode voltage injection amount and circulating current injection amount are determined from Pareto solution set, and the bridge arm modulation voltage after multi-objective optimization isobtained. Multi-objective optimization of MMC is realized. The present application utilizes genetic algorithms to obtain optimal common-mode voltage injection and circulating current injection volumes, thereby reasonably optimizing the MMC.

The invention discloses a pulse power supply based on an avalanche transistor Marx generator and an LTD circuit. The pulse power supply comprises M stages of LTD circuits comprising m partitions, wherein each partition comprises N stages of Marx circuits, each stage of Marx circuit comprises n avalanche transistors connected in series, a trigger unit is connected with a trigger input end of each stage of LTD circuit, and a high-voltage DC power supply 1 is connected with a charging loop of each stage of LTD circuit. The secondary side of the M-stage LTD circuit outputs high-voltage nanosecond pulses in series. According to the invention, by adopting the M-stage LTD circuit with m partitions, the output end of the Marx circuit of each partition is connected with the primary side of the LTD circuit of each stage, wherein the M-stage LTDs are connected to the secondary side in series to output high-voltage nanosecond pulses with the fast leading edge repetition frequency, and the output voltage of n avalanche tubes is greatly increased than that of single-stage Marx circuit of single-avalanche tube. In addition, the two ends of each avalanche transistor are connected in parallel with the voltage-sharing resistors with large resistance values for voltage sharing, so that uneven voltage division of the avalanche transistors is prevented, the output pulse is stable and efficient in voltage and current, and the conduction state of the avalanche transistors in each partition Marx circuit is greatly improved.

The invention discloses a CCD output node with a single-hole structure comprising an MOS tube grid, an MOS tube grid contact hole, a CCD output diode, a CCD output diode contact hole, a restoration filler and a restoration grid. The single-hole structure of the CCD output node is characterized in that: the MOS tube grid is overlapped with the CCD output diode to make the MOS tube grid contact hole be close combined with the CCD output diode contact hole, and a metal is arranged on the two contact holes, which communicates the MOS tube grid contact hole with the CCD output diode contact hole; the single-hole structure takes the two contact holes as a whole to be a new contact hole, resolves the problem of generating corresponding capacitance because of a certain distance existing between the two contact holes. The CCD output node with a single-hole structure has the advantages that: the output amplitude of the CCD is improved 15 percent than the general structure under the same condition, and an object can be imaged in weaker illumination.

The isolator includes a photodiode (first photodiode), a first and a second amplifier, and a carrier discharging circuit. The photodiode is an input element that converts an optical signal input from an LED (signal source) into an electrical signal, and outputs the electrical signal to the first amplifier. The first amplifier includes two bipolar transistors, and amplifies the electrical signal output by the photodiode. The first amplifier also includes three resistances, one of which is a feedback resistance. The second amplifier has a similar structure to that of the first amplifier. The carrier discharging circuit is connected to the base of the bipolar transistor in the first amplifier and to the base of the bipolar transistor in the second amplifier, so as to discharge, when the photodiode turns off, a carrier accumulated in these bases when the photodiode PD1 is on.

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.