123results about How to "Reduce distributed capacitance" patented technology

The invention discloses a transformer core for an inverter power supply, raw material components comprising C, Si, B, (Nb, Sb, V, Mo, Ta, Cr and W), Cu and the balance Fe are put into a vacuum furnace based on a ratio to be refined, the temperature of liquid steel is 1500DEG C, argon is introduced, sprayed and cast on a high rotating speed copper roller, and water is cooled by differential movement, thus obtaining a low magnetostriction amorphous alloy strip with the length of 20-26 micrometers, the strip is wound into a transformer core and heat treatment is carried out at 530DEG C, the temperature is kept for 2-4 hours, thus crystallizing the alloy and obtaining a nano-crystalline core of a low magnetostriction coefficient lambda s; a direct current magnetic field is applied at the same time of keeping and reducing the temperature during the heat treatment; the position of the nano-crystalline core is changed radically, a compressive stress is applied, the stress is eliminated, and the nano-crystalline core recovers until no adhesion exists between lamellas of the whole core; and two side ends of the nano-crystalline core are respectively coated with an unstressed glue layer, and then the surface of the whole nano-crystalline core is coated with an epoxy resin insulating layer for reducing noise. The transformer core which is ideal at present has good noise reduction effect.

The invention discloses an unmanned aerial vehicle multiplex video switching device. According to the multiplex video switching device, a main control unit is controlled with a thumb wheel switch or an industrial personal computer so as to cause the main control unit to drive a multiplex switching unit, so the input not only can be switched to the output, and but also can be outputted to different output channels according to a certain time sequence, and a power amplification circuit is designed in the circuit for video output signals at the same time, so the distributed capacitance can be effectively reduced, the circuit board area can be reduced and the operation of the whole system is more stable. The multiplex switching unit of the invention adopts a eight-channel video high-speed multiplexing chip produced by the MAX company, the switching time is 40ns, and compared with a multiplex mechanical switch of a passive switching device, the large contact noise problem occurring in the switching process does not exist, and the poor contact problem also does not exist.

The embodiment of the invention discloses a two-channel coil antenna and a device applying the two-channel coil antenna, relating to the technical field of antenna and solving the technical problem that cross coupling of two coil antennae is strong in the two-channel coil antenna in the prior art. The two-channel coil antenna in the embodiment comprises a flexible or non flexible medium substrate, a first conductor layer and a second conductor layer are respectively correspondingly arranged on a first surface and a second surface of the medium substrate; the first conductor layer and the second conductor layer are all composed of coils, wherein projection of the coil of the first conductor layer along the normal direction of the plane where the first conductor layer is located and projection of the coil of the second conductor layer along the normal direction of the plane where the second conductor layer is located are mutually separate. The embodiment of the invention is mainly applied to scene of transmitting and receiving signals.

The invention discloses an MEMS integration method. The method comprises steps of: first etching an MEMS area groove, manufacturing a CMOS circuit in an area outside the groove and completing all IC technologies except metal interconnection; then precipitating an IC protective layer and manufacturing an MEMS structure in the groove by employing an MEMS surface sacrificial layer technology; then etching to form lead wire apertures of the IC area, precipitating and imaging the metal to form metal interconnection; finally using photoresist to protect the area outside the groove, removing a sacrificial layer and releasing an MEMS movable structure to obtain a monolithic integration chip. The invention employs MEMS-IC-MEMS intersect manufacturing technology to complete MEMS and IC monolithic integration, reduces height difference between the MEMS structure and the IC through the groove, and reduces pressure of the integration technology on photolithography; meanwhile, technology adjustment avoids metal shedding and improves technology quality and yield.

The invention discloses a radar pulse modulator for modulating direct-current high voltage into various time intervals and various frequencies. A signal receiving module is connected with a pulse generator through a serial interface circuit, the output of the pulse generator is respectively connected with a first driving circuit and a second driving circuit, the outputs of the first driving circuit and the second driving circuit are respectively connected to the primary coil end of a pulse transformer, the outputs of high-voltage power supplies of the first driving circuit and the second driving circuit are respectively connected with an MOSFET branch module and an IGBT branch module, and the MOSFET branch module and the IGBT branch module are in parallel connected and then connected with the input of a branch switching controller; and an FPGA chip of the pulse generator is respectively and externally connected with a parallel output interface, a parallel input interface, a program memory, a switching control switch and a trigger pulse switch. The radar pulse modulator can conveniently control the preheating time of a transmitter, the pulse widths and the repetition frequencies of trigger pulse, restrain the same frequency interference, and obtain better wave forms during a high voltage modulating process; in addition, the driving circuits have faster on-off speed and higher voltage and power capacity.

The invention discloses a bus differential protection method and device using a self-synchronization technology. The method comprises the steps that three-phase instantaneous current at each interval protection installation position connected with a bus is collected, and the break variable of each interval three-phase instantaneous phase current is calculated in real time; the break variable of each interval three-phase instantaneous phase current is compared with a fault determining start threshold value to determine whether a fault exists; if the fault does not exist, returning to the previous step is carried out, otherwise a next step is carried out; in a fault moment detection process, according to the fault moment calculated at each interval, the three-phase current sampling value of the interval fault moment is marked and sent to a protection device; the protection device calculates the differential amount and the braking amount of bus protection of each section; according to the comparison of the differential amount and the braking amount, a bus differential protection criteria is combined to determine a fault section; if bus fails, the failed bus is selected, and the failed bus is removed by protection action; and if bus not fails, protection gets back after a period of time.

The invention discloses a charge testing method in a plasma environment and a testing system. The testing system comprises a chip integrated with MEMS (Micro-electromechanical Systems) and CMOS, and a testing circuit, wherein the chip includes a testing unit consisting of a bi-material cantilever beam temperature-sensitive structure and a structure capable of acquiring plasma density based on electrostatic suction principle; a strain resistor is used as the testing means for acquiring the deformation of the temperature-sensitive structure and a charge collection structure; and the testing circuit is used for measuring the change of the strain resistor. During charge testing, the accumulated charges are tested preliminarily; then, the released charges are re-measured to obviate the influence of an interference factor while only keeping the change influence; and the charge accumulation amount can be calculated. The system can real-time monitor the accumulation amount and the distribution of charges in the time and space domains by using a plurality of testing units arranged in an array manner, thereby providing the possibility for real-time online measurement of the plasma influenceon devices.

The invention belongs to the technical field of the semiconductor laser driving circuit, and specifically relates to a pulse driving circuit based on a vertical cavity surface emitting laser. The structure circuit comprises a vertical cavity surface emitting laser, energy storage units, a switch unit, a driving chip, a current detection unit, a charge current-limiting unit, and an input-output interface; the components are integrated on one circuit board; a light-emitting surface electrode of the vertical cavity surface emitting laser is connected to a circuit board, the energy storage units are distributed around the vertical cavity surface emitting laser, and the switch unit is located on a back of the circuit board located by the vertical cavity surface emitting laser; the energy storage units, the vertical cavity surface emitting laser, the current detection unit and the switch unit form a discharge loop through circuit board via holes. By utilizing the dual-layer structure of thevertical cavity surface emitting laser and the circuit board multilayer circuit structure, the pulse discharge loop can be integrated in the 180-DEG space around the laser, the structure is simple, the distribution parameter is controllable, and the narrow pulse large current parameter is easy to produce, thereby obtaining the laser narrow pulse with high peak power.

The invention discloses a distributed direct current independent power supply system which breaks up a whole direct current power supply system into parts, reasonably divides the direct current power supply system into a plurality of independent operating direct current power supply subsystems, and is arranged to be nearby electricity utilization equipment. The distributed direct current independent power supply system comprises a communication bus, a master control system, a plurality of independent direct current power supply subsystems, a plurality of box-type packaged parallel-connection battery packs, at least one charging unit and at least one monitoring unit, wherein the master control system and the plurality of independent direct current power supply subsystems are respectively connected with the communication bus. Each direct current power supply subsystem comprises a plurality of sections of direct current buses connected with a feeder line terminal unit, and every two sections of adjacent direct current buses are connected through a switch and are allocated. The output ends of the battery packs are respectively connected to the direct current buses through the switches. The at least one charging unit is used for charging all the battery packs and supplies electricity to the direct current buses in hot spare mode. The at least one monitoring unit is connected onto the communication bus, measures and upwards transmits signals of the direct current power supply subsystems to the master control system and receives power grid electricity utilization information of the master control system.

The invention discloses a novel PFC inductor, which comprises a combined magnetic core, an insulating fixture and a flat copper wire. The combined magnetic core comprises two matched sub-magnetic cores, and the two sub-magnetic cores are fixedly connected with each other. The insulating fixture comprises a first insulating paper, a steel strip and a second insulating paper, wherein the first insulating paper, the steel strip and the second insulating paper are sleeved on the outside of the combined magnetic core from the inside and the outside in turn; Flat cop wire is vertically wound aroundtwo sub-magnetic cores and an insulate fixture; The present application also provides a method for preparing a novel PFC inductor. After one layer of flat copper wire is vertically wound, the invention is assembled on two sub-magnetic cores, which is convenient to operate. The two sub-magnetic cores are fixedly connected into a combined magnetic core correspondingly, and the flat copper wire formsa complete coil. The PFC inductance distribution capacitance is reduced, the efficiency is improved, and the heat dissipation effect of the PFC inductance is also increased.

The invention relates to a rotary transformer with relatively small output common ground error, which is composed of a stator and a rotor and exists in two structural forms, namely, segmental type andintegral type. The stator comprises a stator case, a stator iron core and a stator winding wound thereon, and the rotor comprises a rotor shaft sleeve, a rotor iron core and a rotor winding wound the reon, wherein two phase windings of the rotor winding and/or stator winding are all formed by the alternate arrangement of a circular coil assembly and a concentric coil assembly; and the circular coil assembly and the concentric coil assembly under the two poles of the two phase windings are both symmetrically arranged. The capacitance of the rotary transformer is greatly reduced due to the alternative distribution of the output windings, and the output common ground quadrature error and null voltage are also greatly reduced, thus lowering the system angle measurement error, improving the system precision, and simultaneously widening the excitation frequency application range of the rotary transformer, satisfying the application requirements of certain special systems on high excitation frequency and small output common ground error of the rotary transformer.

The invention discloses a transformer. A layer of first coil serving as a primary coil, a layer of second coil serving as a secondary coil, a layer of third coil serving as a primary coil, a layer of fourth coil serving as a secondary coil and a layer of fifth coil serving as a primary coil are wound in the axial direction of a framework, and shielding layers are arranged between the first coil and the second coil, between the second coil and the third coil, between the third coil and the fourth coil and between the fourth coil and the fifth coil respectively. According to the transformer, the winding structure of the primary coil, the secondary coil, another primary coil, another secondary coil and another primary coil is adopted, gaps between the primary coils and the secondary coils are greatly reduced, and leakage inductance is greatly reduced. Meanwhile, total magnetic field intensity of the gaps between the primary coils and the secondary coils is lowered, the total energy of a primary winding space magnetic field and the total energy of a secondary space magnetic field are greatly reduced, and leakage inductance is further reduced and is almost 2-4% of primary inductance. Due to the fact that the leakage inductance is reduced, loss of the transformer and voltage loss are greatly reduced.

The invention discloses a high voltage supply technology used for industrial electrostatic precipitation, comprising a three-phase AC voltage regulating circuit (I), a three-phase step-up transformer (II), a 12-pulse rectifier circuit (III), a current limiting circuit (IV), etc. The three-phase, electrostatic field-generating power supply apparatus is applied between a corona wire and an electrode plate of an electrostatic precipitator, realizing the aim of purifying certain medium in the flue gas, such as dust, fine particles, etc. in flue gas through the electrostatic adsorption effect of the generated electrostatic field. The goal of voltage-regulating is obtained by adjusting a silicon controlled rectifier conduction angle of three-phase AC input, which is the controlling way of the power supply. The output produced by the step-up transformer is rectified into a direct current high voltage through the 12-pulse rectifier and the direct current high voltage is applied on the electrostatic precipitator through a current-limiting circuit. Compared with a traditional power supply apparatus of the electrostatic precipitator, the power supply apparatus of the invention has advantages of high efficiency, large power, lower noise, less impact on an electrical network and fewer harmonic waves, which is more suitable for the industrial purifying and processing of large amount of flue gas.

The invention provides paint capable of shielding a chromatic circle inductor and a process for coating the chromatic circle inductor. The paint capable of shielding the chromatic circle inductor is characterized by comprising the following materials in percentage by mass: 25-50% of chromatic circle inductor paint, 20-55% of soft magnetic ferrite magnetic powder, 10-30% of liquid curing agent and 10-30% of diluent; the manufacturing method for the paint capable of shielding the chromatic circle inductor and the process for coating the chromatic circle inductor comprise the steps of coating for two times by using the paint capable of shielding chromatic circle inductor, and then coating for two times by using the paint capable of shielding chromatic circle inductor. The paint capable of shielding the chromatic circle inductor and the process for coating the chromatic circle inductor have the advantages that interference on other parts caused by leakage flux generated in operating of the chromatic circle inductor can be effectively shielded; the cost of the coating can be greatly reduced; the inductance value can be increased; the self-resonance frequency is increased; and the paint is mainly suitable for packaging of the chromatic circle inductor.

The invention relates to a method for manufacturing a winding wire, which comprises the steps of: drawing a copper rod with a diameter of phi 3mm to be between phi 0.10 and phi 0.19mm through a wire drawing machine to obtain a copper conductor; then performing annealing and painting to obtain an enameled wire; and then extruding polyester insulation resin outside the enameled wire through a single-screw extruder to obtain the winding wire. Compared with the prior art, the method is simple; and an obtained winding wire product can replace conventional enameled wires to be applied to transformers and high-frequency winding coils to ensure that the transformers and the high-frequency winding coils have compact structures and reduced cost.

The invention discloses a coiling method for an annular inductor. The coiling method includes the steps that an annular magnetic core is evenly divided into four coiling regions, a copper wire is symmetrically folded, one end of the copper wire is clockwise coiled around the annular magnetic core, and the other end of the copper wire is anticlockwise coiled around the annular magnetic core; the copper wire is flatly and densely coiled in the four coiling regions to form four copper coil sets, and gaps are reserved between the copper coil sets of the adjacent coiling regions. Compared with the prior art, the copper wire is symmetrically folded, the two ends are coiled around the annular magnetic core, the four coiling regions are formed on the annular magnetic core, the copper wire is flatly and densely coiled around the coiling regions, the gaps are reserved between the adjacent coiling regions for obviously partitioning, and the method is called 'a quadrant coiling method'; the coiling method can be suitable for copper wire coiling of the difference module inductor and the PFC inductor, the defects that existing coiling methods are low in efficiency and poor in electromagnetic interference resistance are overcome, the resistance of the inductor is obviously increased, the distributed capacitance of the inductor is small, and coiling working efficiency is high.

A high frequency magnetic field treatment device comprises high-frequency source and high frequency magnetic field radiator. High frequency magnetic field radiator comprises a parallel-plate capacitor, a group of radiant coil with both ends respectively fixed at two sets of pole plates of capacitor and tuned at high working frequency. Coil can be single line loop or multiple same wire loops parallel connected by capacitor plate through several coils. As the coil inductance of radiator is small, it can generate high efficient large caliber high frequency magnetic field used for diathermic heating treatment including tumor heat treatment.

The present invention provides a post-CMOS integrated method for threshold presetting. According to the method, a threshold drift magnitude introduced by a MEMS pre-estimating process is adopted to adjust a doping concentration of a CMOS process in an IC process to increase threshold symmetry of a MOS transistor after the post-CMOS process. According to the method, threshold drift defect is subjected to conversion utilization, special low-stress material production equipment is not required, MEMS movable structure and IC monolithic integration requirements can be met, and threshold symmetry of the MOS transistor of the integrated circuit portion can be ensured.

The invention relates to a method for manufacturing a tinned winding wire. The method comprises the following steps: firstly, drawing a copper bar with a diameter of 3 millimeters by a drawbench to make a thin copper bar, performing annealing and then tinning the copper bar to obtain a tinned copper conductor; secondly, extruding and cladding two layers of polyphenylene sulfide insulating layers on the outside of the tinned copper conductor in turn by a three-head extruder; and thirdly, extruding and cladding a polyamide resin insulating layer on the outside of the two polyphenylene sulfide insulating layers. Compared with the prior art, the method of the invention is simple, and the heat resistant grade of the product obtained reaches F grade (155 DEG C). Transformers and high-frequency winding coils which adopt the tinned winding wire of the invention are safe, reliable and highly stable; the leakage inductance and the distributed capacitance are obviously reduced; and the high-frequency characteristics and the anti-interference performance of the transformer are obviously improved.