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79results about How to "Has an isolation effect" patented technology

Bidirectional tri-path turn-on high-voltage ESD protective device

ActiveCN102983133ACorrection for weak robustnessCorrection speedSolid-state devicesSemiconductor devicesHigh pressurePolysilicon gate
The invention provides a bidirectional tri-path turn-on high-voltage ESD (Electro-Static Discharge) protective device which can be used in an on-chip IC (Integrated Circuit) high-voltage ESD protective circuit. The bidirectional tri-path turn-on high-voltage ESD protective device comprises a P minus substrate, an N plus buried layer, a left N-type epitaxy, a right N-type epitaxy, a drifting area, a high-voltage P trap, a drain region, a source region, a polysilicon gate, a positive pole contact area and a negative pole contact area, wherein the drifting area, the high-voltage P trap, the drain region, the source region and the polysilicon gate form an NLDMOS (laterally diffused metal oxide semiconductor) structure, and the positive pole contact area, the N plus buried layer, the high-voltage P trap and the source region form a positive SCR (semiconductor control rectifier)structure, so that two high-voltage ESD current discharge paths are formed to improve secondary striking current of the device and reduce the turn-on resistance and trigger voltage; and the negative pole contact area, the left N-type epitaxy, the high-voltage P trap, the N plus buried layer and the drain region form a reverse SCR structure to form a reverse high-voltage ESD current discharge path. The current paths of the two SCR structures are longer, so that the maintaining voltage of the device can be improved, bidirectional discharge of ESD current can be realized, and the device has bidirectional ESD protection function.
Owner:铜陵汇泽科技信息咨询有限公司

Preparation method for high performance butadiene-styrene-isoprene powder polymer

The invention adopts a direct coagulation method for preparation of a high performance butadiene-styrene-isoprene powder polymer. The method comprises the following steps: dispersion of a carbon nanotube: a step of adding the carbon nanotube and water into a high-speed disperser and carrying out stirring to allow the carbon nanotube to be uniformly dispersed; preparation of graft latex: a step of successively adding water, styrene-butadiene latex, an emulsifier and a molecular weight regulator into a polymerization kettle, carrying out nitrogen displacement, adding isoprene, carrying out stirring and heating, adding an initiator and carrying out polymerization to prepare the graft latex; and coagulation for formation of powder: a step of successively adding the graft latex, water and the carbon nanotube into a coagulation kettle, carrying out stirring and heating, adding a release agent, a flocculating agent and a coagulating agent and carrying out curing, washing, dehydration and drying to obtain the powder polymer. The prepared powder polymer has the following performances: a powder particle size of 0.5 to 0.8 mm; isoprene content in PSBIR of 20 to 40%; Mooney viscosity ML(1+4)<100 DEG C> of 50 to 70; 300% stress at definite elongation of 18 to 25 MPa; tensile strength of no less than 27.0 MPa; elongation at break of no less than 560%; antistatic resistance of 106 to 109 omega; and electrization voltage of less than 100V.
Owner:PETROCHINA CO LTD

Preparation method of powdered acrylonitrile-butadiene rubber with high performance

A preparation method of a powdered acrylonitrile-butadiene rubber with high performance comprises steps of: dispersing of carbon nanotubes: adding carbon nanotubes and water in a high-speed disperser, and stirring to evenly disperse the carbon nanotubes; preparation of a rapid polymerization latex: adding water, acrylonitrile and an emulsifier into a polymerization kettle, after confirmation of no leakage, adding butadiene, a crosslinking agent, an initiator and a molecular weight regulator for polymerization; and when the conversion rate reaches a certain level, adding a terminator to obtain a fast polymerization acrylonitrile-butadiene latex; and condensation into a powder: adding the acrylonitrile-butadiene latex, water, carbon nanotubes, a separant, a flocculant and a coagulant into a coagulation tank; curing, washing, dehydrating and drying to obtain the powdered acrylonitrile-butadiene rubber. The prepared acrylonitrile-butadiene rubber slurry has the following properties: pH of 7-10, Mooney viscosity of ML (1+4) 100 DEG C 60-110, structure gel of 75%-85%, and acrylonitrile-butadiene rubber mechanical stability of less than 1.0%; and the powdered acrylonitrile-butadiene rubber has the following properties: powder particle size of 0.6-1.0 mm, acrylonitrile content of 40%-55%, ash content no more than 1.0, volatile matter no more than 1.0, and powdered ratio no less than 95%.
Owner:PETROCHINA CO LTD

Paste water-based isolation agent, preparation method and application method thereof

ActiveCN104987519AHigh gum contentImprove thixotropyCoatingsWater basedDissolution
The invention discloses a paste water-based isolation agent, a preparation method and an application method thereof thereof. The paste water-based isolation agent comprises the following components by mass: 3-5 parts of an inorganic powder additive, 0.1-1.0 part of an anionic surfactant, 0.5-5.5 parts of a nonionic surfactant, 5-10 parts of a thixotropic agent, 0.2-2.0 parts of a thickener, 0.1-0.5 part of a defoaming agent, and 60-100 parts of deionized water. The preparation method consists of: mixing water with the surfactants, conducting stirring dissolving, adding the inorganic powder additive, and adding the defoaming agent dropwise, adding the thixotropic agent and thickener in batches, stirring the materials fully, and performing grinding to a homogeneous phase, thus obtaining the isolation agent. And the application method includes: during use, preparing the isolation agent into a water solution according to a mass ratio of 1:3-15, adding the water solution into a water cooling groove of a rubber slice to realize isolation agent coating at the same time of water cooling, and then carrying out rod hanging drying and stacking. The paste water-based isolation agent provided by the invention has the advantages of easy water dissolution, no toxicity, no smell, simple process and low cost, and almost has no effect on the subsequent processing performance of rubber.
Owner:江苏益路昇新材料有限公司

Isolated human body impedance detection circuit and detection method thereof

The invention discloses an isolated human body impedance detection circuit and a detection method thereof. The isolated human body impedance detection circuit comprises a pulse generator, a data processing unit, a data display unit, one or more treatment electrodes, and one channel or two impedance acquisition units. The output end of the pulse generator is connected to the input end of the treatment electrode, an acquisition input of the impedance acquisition unit is also respectively connected to the output of the treatment electrode, and the acquisition output of the impedance acquisition unit is connected to the input of the data processing unit. The invention also discloses a detection method, which is characterized in that a voltage trigger signal and a current trigger signal are obtained through one or more voltage detection electrodes and detection points where the current detection electrode contacts the human body; the voltage trigger signal and the current trigger signal arerespectively pre-processed, and then sent to the data processing unit for calculation. The isolated human body impedance detection circuit can perform human body impedance detection, guarantees the effect of electroporation, can achieves the effect of monitoring ablation in real time, and reduces the volume and weight of the detection equipment circuit.
Owner:SHANGHAI UNIV OF MEDICINE & HEALTH SCI

Car charger and control method thereof

The invention relates to a car charger and a control method thereof. The car charger comprises a controller, an alternating-current / direct-current transformer and a two-way direct-current transformer,which are separately connected to the controller, and a car battery which is connected to the two-way direct-current transformer, wherein the controller is used for obtaining first voltage control parameters according to first preset voltage and first feedback voltage output on the alternating-current / direct-current transformer while the alternating-current / direct-current transformer is connectedto an alternating-current source, stabilizing the current output voltage value as first preset voltage by controlling the alternating-current / direct-current transformer according to the first voltagecontrol parameters, and charging the car battery through control over the two-way direct-current transformer; and the controller is further used for obtaining second voltage control parameters according to second preset voltage and second feedback voltage output on the two-way direct-current transformer while the alternating-current / direct-current transformer is connected to the load, and stabilizing current output voltage value as second preset voltage by controlling the two-way direct-current transformer according to the second voltage control parameters, and charging the load by controlling the alternating-current / direct-current transformer.
Owner:BYD CO LTD

Novel high-temperature-resistant low-smoke flame-retardant composite cable material and preparation method thereof

The invention discloses a novel high-temperature-resistant low-smoke flame-retardant composite cable material. The novel high-temperature-resistant low-smoke flame-retardant composite cable material is prepared from the following raw materials in parts by weight: 90-92 parts of high density polyethylene, 15-17 parts of deca-brominated diphenyl ether, 7-9 parts of antimonous oxide, 2-3 parts of metallocene polyethylene, 2-3 parts of nano magnesium hydroxide, 4-5 parts of cyclohexane, 0.2-0.3 part of gamma-aminopropyl triethoxy silane, 6-8 parts of epoxy resin glue, 10-12 parts of poly 4-methyl-1-pentene, 7-9 parts of silicon carbide, 3-5 parts of clay, 2-3 parts of tribasic lead sulphate, 2-3 parts of Tween 80, 5-6 parts of carbon fibers and a right amount of water. The novel high-temperature-resistant low-smoke flame-retardant composite cable material has the advantages that after a series of processing steps are carried out, the carbon fibers, clay and epoxy resin glue are compatible and then are added into the base material high density polyethylene, so that strength of the product can be improved, and weight is light; the epoxy resin glue is added and compounded with poly 4-methyl-1-pentene, so that temperature class can be improved; and the novel high-temperature-resistant low-smoke flame-retardant composite cable material is resistant to high temperature and breakdown, low-smoke and flame-retardant and can be used for manufacturing an automotive cable and the like.
Owner:安徽吉安特种线缆制造有限公司

A method of transmitting data in one direction

The invention discloses a method for unidirectional transmission of data, which comprises the following steps: a sending end loads the data to be transmitted into a light wave and emits the data to betransmitted, and propagates the same to a receiving end; an isolation device arranged on the optical path between the transmitting end and the receiving end passes the light wave propagated from thetransmitting end to the receiving end, the isolation device is not powered on, and the light wave propagated from the receiving end to the transmitting end can be prevented from passing through; and the receiving end receives the propagated light wave and demodulates the data. An optical path between the sending end and the receiving end is provided with the isolation device, the isolation deviceis capable of passing a light wave propagating from the transmitting end to the receiving end, while preventing the light wave propagated from the receiving end to the transmitting end from passing through, thus ensuring the unidirectional transmission of data between the transmitting end and the receiving end, and the isolation device is not powered on, has isolation function to the electric signal, and can avoid the situation of reverse breakdown caused by the voltage overload.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1

Package of single transposition winding

The invention discloses a package of a single transposition winding. The package of the single transposition winding comprises a spacing strip which is of a belt shaped structure and arranged at the bottom part of the transposition winding, wherein the spacing strip is arranged along the length direction of the transposition winding; net wrapping belts are arranged around the transposition winding and the spacing strip in a manner of obliquely coiling and wrapping the peripheries of the transposition winding and the spacing strip; a protecting belt is arranged at the outer parts of the net wrapping belts in a manner of obliquely coiling and wrapping the peripheries of the net wrapping belts; a tearing line is arranged between the net wrapping belts and the protecting belt along the length direction of the transposition winding; one head of the tearing line is arranged at the outer part of the package. Compared with the prior art, the package of the single transposition winding has the advantages that the transposition winding is packed through the spacing strip, the net wrapping belts and the protecting belt, so that the transposition winding is insulated, radiating, damp-proof and durable, and as a result, the transposition winding can be coiled with each other and stored for a long time; in addition, the transposition winding is conveniently transported in outdoor, and moreover, the potential risk in the use of the transposition winding can be avoided.
Owner:SUZHOU SHENGBAIWEI PACKAGE EQUIP

Voltage control circuit and electric control permanent magnet controller

The invention discloses a voltage control circuit. The voltage control circuit comprises a boost circuit module, a capacitor energy storage circuit module, a first relay module and a second relay module; the boost circuit module is connected with a direct-current power supply; the capacitor energy storage circuit module is connected with the boost circuit module in series; the first relay module can be connected with the capacitor energy storage circuit module and the boost circuit module, so that the capacitor energy storage circuit module is enabled to be in a charging state, or, the first relay module can be connected with the capacitor energy storage circuit module and the second relay module, so that the capacitor energy storage circuit module is enabled to be in a discharge state; and the second relay module is connected with a load and at least can enable the capacitor energy storage circuit module to output forward or reverse current to the load. The invention further providesan electric control permanent magnet controller adopting the voltage control circuit. The electric control permanent magnet controller has the advantages of small size, accurate control and the like.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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