34results about How to "Small distribution parameter" patented technology

The invention discloses an epoxy support used for installing a drawer-type power supply module. The support comprises a square shell 1 formed by epoxy plates. A lower surface of shell 1 is provided with a high pressure porcelain bottle 2. The several epoxy plates are vertically installed in the shell 1. An epoxy plate A4, an epoxy plate B9, an epoxy plate C10, an epoxy plate D11, an epoxy plate E12 and an epoxy plate F13 are included. A transformer 3 is installed on the epoxy plate A4 located at a center position in the shell 1. The plurality of transformers are installed on the epoxy plate A4 located at the center position in the shell 1. Copper bars 5 are installed on two sides of the epoxy plate A4 through an insulation support component 6. The transformer 3 provides power through the copper bars 5. Epoxy strips 14 are installed on the epoxy plate B9, the epoxy plate C10, the epoxy plate E12, the epoxy plate F13 and left and right epoxy plates of the shell 1. Power supply modules can be installed on the epoxy strips 14.

The invention relates to a moisture content measuring device based on a plug-in capacitive sensor. The moisture content measuring device comprises a capacitance sensor, a signal processing unit, an effective value measuring unit and a calculating unit. The capacitive sensor includes an excitation and measuring electrode as an excitation electrode and a measuring electrode, and two protection electrodes fixed above and below the excitation and measuring electrode. The signal processing unit comprises a front amplifier, a coaxial cable, an AC signal generator and a differential amplifier. A negative input end of the front amplifier is connected to the excitation and measuring electrode in the capacitive sensor through a coaxial cable signal line. A positive input end of the front amplifier is connected to the AC signal generator and is connected to the two protection electrodes in the capacitive sensor, a shielding layer of the coaxial cable and a negative input end of the differential amplifier. A standard resistor and a capacitor are connected in parallel and are connected to the negative input end and an output end of the front amplifier. The output end of the front amplifier is connected to a positive input end of the differential amplifier.

The invention provides an electromagnetic interference-prevention power regulation circuit integrated module and an installation method thereof. The electromagnetic interference-prevention power regulation circuit integrated module comprises a copper-coated ceramic substrate and power regulation circuit components and also comprises a shell, wherein the power regulation circuit components are arranged on the copper-coated ceramic substrate, the copper-coated ceramic substrate and the power regulation circuit components are arranged in the shell, the copper-coated ceramic substrate comprises aceramic layer at a bottom layer and a copper-coated layer at an upper layer, the shell comprises a shell body, an upper cover plate and lead terminals, the shell body wraps bottom surfaces and peripheries of the copper-coated ceramic substrate and the power regulation circuit components, the upper cover plate covers the top of the shell body, and the lead terminals are used for connecting the interior and the exterior of the shell body. The electromagnetic interference-prevention power regulation circuit integrated module has the beneficial effects that a power regulation circuit with relatively serious electromagnetic interference is completely sealed in the shell, the distribution parameter of a power device interconnection loop is reduced, and the electromagnetic radiation of the powerregulation circuit is effectively shielded; and with the adoption of a material with favorable heat conductivity, the thermal resistance between a power semiconductor component and the whole structureis reduced.

The invention discloses a coplanar electrode analog photoelectric detector chip and a manufacturing method thereof. The coplanar electrode analog photoelectric detector chip comprises an epitaxial wafer and an ohm contact layer formed on the rear surface of the epitaxial wafer; the epitaxial wafer comprises a substrate, a buffer layer, an absorption layer, a transition layer, a top layer, a passivation layer, a doped photosensitive area, a limiting channel, an antireflective transition film layer, a P-type electrode metal layer and an N-type electrode metal layer; the top layer is a n-type III-V top layer with at least three elements; the doped photosensitive area is circular; the limiting channel is semi-circular and surrounds the doped photosensitive area. The manufacturing method of the coplanar electrode analog photoelectric detector chip is simple in process and high in finished product rate; the coplanar electrode analog photoelectric detector chip manufactured by the method has the characteristics of low distortion, low dark current, high linearity, high responsibility, high reliability and the like.

An insulation ageing test device of frequency conversion high voltage pulse equipment is prepared as connecting output end of pulse generator to primary edge of high voltage boosting transformer with its secondary edge being connected to wire in insulation sleeve, applying 300H2 to lkH2, 1kH2 to 5kH2 , 5kH2 to 10k H2 and 10k H2 to 20k H2 as operation frequency of high voltage boosting transformer alternately, connecting said boosting transformer to output of pulse generator for outputting square wave to meet requirements of insulation ageing test.

The invention discloses a method for manufacturing a sheet-type alloy foil resistor, which belongs to the technical field of alloy foil resistors. The uniform hexamethyldisilazane process is used to improve the adhesion of the photoresist and effectively reduce the side engraving of the foil. Corrosion, using the aging process to improve reliability, so that the manufactured alloy foil resistance value has high precision, small temperature coefficient of resistance, within a wide range of temperature coefficient, automatic compensation of temperature coefficient is realized, the tracking temperature coefficient is extremely small, low noise, stable High performance, good high-frequency characteristics, fast response, small distribution parameters, can be used in precision measurement, digital-to-analog conversion, aviation and navigation inertial navigation systems, computer interface circuits and some systems with special requirements, suitable for large-scale promotion.

A marine active antenna waterproof radio frequency connector, which includes a base (11), a first insulator (3) and a contact (1), characterized in that the boss end of the first insulator (3) is inserted into the base (11 ), one end surface of the first insulator (3) with a boss is against the surface of the base (11), and the rod of the contact (1) extends into the base through the through hole on the first insulator (3) In (11), the second insulator (6) and the locking device for fixing the rod of the contact (1) located in the base (11) are successively set on the rod of the contact (1) located in the base (11). A nut (8), with a solder piece (9) fixed on the end surface of the rod of the contact (1) located in the base (11); the other end of the contact (1) is provided with an inner The inner threaded hole (20) connected with the screw rod and the outer thread (16) matched with the inner thread (15) on the screw cover (17) of the fixed antenna (14). The invention can be widely used in the waterproof electrical connection of various outdoor electronic products, while keeping the small distributed electrical parameters of the contacts to the ground.

The invention discloses a single-turn inductive pulse transformer. The pulse transformer is characterized in that a circular iron core is arranged in a casing, and connectors are arranged on the two sides of the casing to be connected with high and low ends of the pulse transformer respectively. A copper plate is arranged on a base, and screws for mounting a primary power module are arranged on the two sides. The pulse transformer has the advantages that the primary circuit voltage is low, the high end is hidden inside, and the insulation cost is low; the casing is used as the single-turn primary coil, so that complex winding processes are prevented, the pulse transformer distribution parameter is small, and the pulse output waveform is close to an ideal waveform, so that the power transmission efficiency is high; the primary wire turn lead-out end is inserted and pulled through the connectors, so that the pulse transformer is convenient to dismount and mount; the modular design is used, so that the structure is simple, oil cooling is not needed, the size is small, the cost is low, and multi-group serial connection stacking is facilitated.

The invention discloses a lateral light incidence type PIN photoelectric detector chip and a manufacturing method thereof. The PIN photoelectric detector chip comprises a substrate, a buffer layer, an absorption layer, a transition layer, a top layer, a contact layer, composite passivation layers, a first protection layer, a negative electrode, a positive electrode, a doped active region and an antireflection film, wherein the substrate is provided with a light incidence surface; the antireflection film is formed on the light incidence surface; an inverted V-shaped corrosion groove is formed in the bottom of the substrate, opposite to the doped active region, and is provided with a first side wall and a second side wall; the first side wall and the bottom surface of the substrate form an angle of 45 degrees; the first protection layer is a polyimide protection layer with low dielectric constant; the contact layer, the top layer, the transition layer and the composite passivation layer at the absorption layer form a P-type table surface; the composite passivation layer at the buffer layer forms an N-type table surface; both the P-type table surface and the N-type table surface are concentric with the doped active region.

The invention relates to a measuring circuit for moisture content and mineralization degree based on a plug-in impedance sensor. The measuring circuit is used for measuring moisture content and mineralization degree in an oil-water two-phase flow pipeline. The measuring circuit comprises an impedance sensor, a signal processing unit, a demodulation unit and a calculating unit; the impedance sensorcomprises an exciting measuring electrode and two protecting electrodes; the exciting measuring electrode is simultaneously served as an exciting electrode and a measuring electrode; the protecting electrodes are fixed above and under the impedance sensor; the signal processing unit comprises a front-end amplifier, a coaxial cable, an alternating current signal generator and a differential amplifier; a negative input end of the front-end amplifier is connected with the exciting measuring electrode in the impedance sensor through a coaxial cable signal wire; a positive input end of the front-end amplifier is connected with the alternating current signal generator and meanwhile is connected with the two protecting electrodes in the impedance sensor, a shielding layer of the coaxial cable and the negative input end of the differential amplifier; a standard resistor is connected with the negative input end and output end of the front-end amplifier; the output end of the front-end amplifier is connected with the positive input end of the differential amplifier.

The invention relates to a high-power self-cooled thyristor valve and a vehicle for assembling the same. The invention is characterized in that: a single-phase thyristor valve body comprises two thyristor valve string, and insulating tension rods, flanges, radiating fins, high-potential trigger plates, energy-taking magnetic rings, high-voltage energy-transmitting cables and a plurality of retaining nuts which are symmetrically distributed; every two thyristors are in positive and negative parallel connection with each other through flexible cables on the radiating fins to form a thyristor valve unit; a plurality of thyristor valve units form a thyristor valve string through parallel connection and upright stacking; radiating fins are pressed between each layer of thyristor valve units atintervals; the two thyristor valve strings form a single-phase thyristor valve through positive and negative parallel connection; both ends of the insulating tension rods are respectively fastened between an upper flange and a lower flange through the retaining nuts; the high-voltage energy-transmitting cables are connected to the inside of the thyristor valve body through the energy-taking magnetic rings of the high-potential trigger plates; the single-phase thyristor valve body inputs and outputs current through two moving contacts; the two moving contacts and the thyristor valve body are fixed together through copper bars which are fixed on the upper end and the lower end of the insulating tension rods through the flanges; and annealed copper sheets which are communicated with the radiating fins are arranged on the copper bars.