888results about "Non-adjustable resistors" patented technology

The present invention provides: a copper alloy material which has a volume resistivity within a desired range, has a thermal electromotive force against copper having a small absolute value, and has a temperature coefficient of resistance of 0 or a negative number having a small absolute value over a wide temperature range from a normal temperature (for example, 20° C) to a high temperature (for example, 150° C); and a resistive material for resistors, a resistor, a material for heating elements, and a heating element, each using said copper alloy material.　This copper alloy material has an alloy composition that contains from 7.0% by mass to 17.0% by mass of Mn, from 0.1% by mass to 3.0% by mass of Ni, and from 1.0% by mass to 5.0% by mass of Al, with the balance being made up of Cu and unavoidable impurities. The resistive material for resistors and the material for heating elements are composed of this copper alloy material. The resistor comprises this resistive material for resistors. The heating element comprises this material for heating elements.

The invention discloses a carbon ceramic composite conductive microsphere, a ceramic resistor and a preparation method, and belongs to the technical field of production of special materials of electrical equipment, and the method comprises the following steps: sequentially dipping porous mullite in a precursor solution of carbon and slurry containing carbon black, and carrying out drying treatment and carbon burying sintering to obtain the carbon ceramic composite conductive microsphere; the preparation method comprises the following steps: preparing a ceramic raw material, performing vacuum-assisted centrifugal impregnation on the ceramic raw material and slurry consisting of a binder in pug consisting of the ceramic raw material and a surfactant, sequentially performing drying and glue discharging treatment, primary isostatic pressing forming and air pressure sintering, cooling to room temperature, and performing mechanical treatment and electrode spraying to obtain the ceramic resistor. Impregnation improves the dispersibility and uniformity of the carbon material in the porous mullite to form a continuous conductive path, the carbon black-containing slurry improves the conductivity of the ceramic resistor, carbon-buried sintering generates in-situ carbon with abundant types, the combination of carbon and a ceramic interface is promoted, and the oxidation resistance, mechanical properties and electrical properties of the ceramic resistor are improved.

The utility model relates to the technical field of resistors, in particular to an anti-vulcanization moisture-resistant thick-film resistor. According to the technical scheme, the resistor comprises an aluminum oxide ceramic substrate, a resistor body is printed on the upper surface of the aluminum oxide ceramic substrate, front electrodes are printed at the two ends of the resistor body, extending parts of the two ends of the resistor body are covered with the front electrodes, back electrodes are printed on the lower surface of the aluminum oxide ceramic substrate, and the aluminum oxide ceramic substrate is provided with side electrodes. The front electrode, the back electrode and the side electrode are all silver electrodes, a nickel electrode is arranged outside the silver electrodes, a tin electrode is arranged outside the nickel electrode, and a first anti-vulcanization layer is arranged between the silver electrode and the nickel electrode at the two ends of the resistor body. A second anti-vulcanization layer is arranged between the nickel electrode and the tin electrode at the two ends of the resistor body, and a first protective layer and a second protective layer are arranged on the surface of the resistor body.

The invention discloses a thin film resistor device and a preparation method thereof. The preparation method comprises the following steps: forming a second insulating layer on a first metal interconnection layer and an exposed first insulating layer; forming a thin-film resistor structure in a partial region of the upper surface of the second insulating layer; forming a third insulating layer on the thin-film resistor structure and the exposed upper surface of the second insulating layer; forming a first contact hole extending from the upper surface of the third insulating layer to the first metal interconnection layer, and filling the first contact hole with first contact metal; forming a second metal interconnection layer on the upper surface of the third insulating layer; forming a fourth insulating layer on the second metal interconnection layer and the exposed third insulating layer; and forming a second contact hole extending from the upper surface of the fourth insulating layer to the second metal interconnection layer and a third contact hole extending from the upper surface of the fourth insulating layer to the thin-film resistor structure, and filling second contact metal and third contact metal in the second contact hole and the third contact hole respectively. According to the thin film resistor device and the preparation method thereof, the stability of the device can be improved.

Systems, apparatuses, and methods relate to modular resistor grid assemblies having a “black box” resistance. The modular resistor grid assemblies include a first plurality of first resistor plates having a first thickness disposed within a first housing. The first housing has a first input and output terminal. The first resistor plates provide a target electrical resistance between the first input output terminal. A second plurality of second resistor plates having a second thickness smaller than the first thickness is disposed within a second housing. The second housing has a second input and output terminal. The second resistor plates provide the target electrical resistance between the second input and output terminal. The first and second housing interchangeably couple to a resistive braking system. The first plurality includes a first number of first resistor plates, and the second plurality includes a second number of second resistor plates less than the first number.

According to the chip resistor and the preparation method thereof, the laser wire cutting grooves adjacent to the left electrode and the right electrode are formed in the resistance layer through laser cutting, the resistance value of the resistor can be accurately adjusted and controlled, the manufacturing precision and consistency of the resistor are improved, the laser cutting mode is optimized through diagonal cutting, and the production efficiency is improved. The laser wire cutting groove is limited at the diagonal position and is adjacent to the front electrode, and the heat effect of the resistor is correspondingly controlled, so that the heat dissipation performance is improved; according to the chip resistor, through a multi-layer protection structure formed by the first protection layer made of the glass material and the second protection layer made of the epoxy resin material, the invasion of moisture, chemical corrosion and mechanical damage is effectively prevented, the service life of the resistor in a severe environment is remarkably prolonged, and particularly, through the third protection layer made of the resin silver material, the service life of the resistor is prolonged. The anti-corrosion performance of the electrode part is enhanced, so that the resistor can keep stable electrical performance during long-time work.

The present invention belongs to the technical field of lightning protection of power transmission lines, and in particular, relates to a method for limiting lightning overvoltage of a direct-current power transmission line. By means of using operation date of a line itself, lightning current monitoring data, and parameters of an environment where the line is located, a line dynamic operation function curve and a line lightning-protection performance function curve are both corrected to obtain a more realistic voltage difference, thus achieving reliable protection actions and state sensing of a lightning arrester on the line. An apparatus for limiting a lightning overvoltage of a direct-current power transmission line is further provided in the present invention to cooperate with the implementation of the method.

An overvoltage protection device having a casing with an internal space, an earth branch, a positive branch, and a negative branch that join. The device also has an earth connector, n1 positive connectors, n1 being greater or equal to 3, and n2 negative connectors, n2 being greater than or equal to 3.

Provided are a thin-film resistor and a circuit board. The thin-film resistor comprises a substrate layer and a first resistor layer, wherein at least one side surface of the substrate layer has several protrusions; the first resistor layer is located on the side surface of the substrate layer that has the protrusions; the ratio of the surface area of the side surface of the substrate layer that has the protrusions to the projection area of the substrate layer is 1.3-10; and the first resistor layer is located on the side surface of the substrate layer that has the protrusions, and is configured in the same shape as the substrate layer. The above definitions improve the uniformity of the first resistor layer deposited on a surface of the substrate layer, thereby improving the sheet-resistance uniformity of the first resistor layer, facilitating the preparation of an embedded resistor having relatively high precision, and facilitating the performance of a circuit board and even an electronic element.

The invention relates to the technical field of resistance paste, and provides resistance paste and a preparation method thereof, and the resistance paste comprises 70-112 parts of a conductive phase material, 0.1-3 parts of a temperature coefficient regulator, 0.1-2 parts of a thermal expansion coefficient regulator, 0.1-5 parts of a sintering activator, 2-5 parts of glass powder, and 14-41 parts of an organic carrier. According to the resistance paste provided by the invention, the conductive phase material serves as a core component and is used for forming a continuous and compact conductive network; the temperature coefficient regulator controls the resistance temperature coefficient of the resistance paste, so that the resistance paste can keep the resistance value stable in a wider temperature range; the thermal expansion coefficient regulator reduces the thermal expansion coefficient of the resistance paste, so that the resistance paste is compatible with a base material, and the problem of cracking after sintering caused by overlarge thermal expansion coefficient is avoided; the sintering activator reduces the sintering temperature of the resistance paste, promotes diffusion and rearrangement among particles, improves the sintering density, improves the combination between the paste and a base material, and improves the stability and reliability of a resistor body.

The utility model relates to the technical field of resistors, in particular to a chip resistor, which comprises a PCB (printed circuit board), a resistor body and a protective layer arranged on the surface of the resistor body, electrodes are fixed on two sides of the top of the PCB and are symmetrically distributed, clamping heads are arranged at two ends of the resistor body, the clamping heads are movably connected with the electrodes, and the protective layer is arranged on the surface of the resistor body. A quick release mechanism is arranged between the electrode and the clamping head, a protection mechanism is arranged on the surface of the PCB, a ventilation groove is formed in the surface of the PCB, protruding parts are fixed to the two sides of the clamping head, a groove is formed in the inner side of the electrode, and the protruding parts are connected with the groove in a clamped mode; according to the utility model, the resistor body can be quickly fixed on the PCB through the buckles at the two sides, the resistor body and the PCB can be conveniently disassembled and assembled, the adverse effect of welding on maintenance and replacement is avoided, the service life of the resistor is prolonged, the protective cover at the top can physically protect the resistor body, and the safety of the resistor body is improved.

The utility model provides a leveled resistor element, which comprises a substrate, a resistor layer and an electrode layer, solves the problems of impedance increase and abnormal product characteristics caused by improper joint of an interface between the electrode layer and the resistor layer, and comprises the following steps of: after the electrode layer process is finished, forming the resistor layer on the substrate; and laser or grinding is utilized to eliminate the height difference of the interface and process the discontinuous structure of the outline of the electrode layer.

Embodiments of the present disclosure provide a surge protector and a surge protection apparatus. The surge protector comprises: a housing comprising a line pin and a ground pin; a surge protection component accommodated in the housing and coupled to the ground pin, wherein the surge protection component has a width less than a height and a length to form a flat shape; and a tripping assembly, comprising: a fuse component arranged in the housing and entirely located at one side of the surge protection component in the height direction; and a separate component coupled between the fuse component and the surge protection component via an elastic component and adapted to be moved to a tripping position when the solder is melted.

The present invention relates to a current sensing resistor (1) for measuring a current (I), the current sensing resistor (1) comprising two connection members (2, 3), a resistive element (4), a pair of voltage sensing contacts (8-19) for measuring a voltage drop across the resistive element (4), and at least one notch (20) in at least one of the connection members (2, 3), the notch (20) surrounding the voltage sensing contacts (8-19) and preventing current from flowing beyond the notch (20). The present invention provides a plurality of pairs of voltage sensing contacts (8-19) arranged in series in the direction of current flow.

The invention relates to the technical field of resistors, in particular to a high-performance heat dissipation load unit which comprises an air duct, a motor fixed to the air duct, a rotating shaft installed on an output shaft of the motor, a supporting disc fixed to the rotating shaft and a plurality of supporting fan blades fixed to the supporting disc in a spaced mode in the circumferential direction. The air duct is provided with an external liquid groove, and the outer end part of each supporting fan blade is provided with an external leading-out terminal inserted into the external liquid groove; the air duct is provided with an internal liquid receiving groove; an inner leading-out terminal inserted into the inner liquid receiving groove is arranged at the inner end part of each supporting fan blade; the supporting fan blades are insulators, and the two ends of the resistance wire of each supporting fan blade are connected with the outer leading-out terminal and the inner leading-out terminal of the corresponding supporting fan blade respectively, so that the resistance wires are electrically conducted through the conductive liquid. Compared with an existing load, the heat dissipation effect is good, the wind resistance is low, and the requirement for a draught fan is lowered. Whether the group of resistance wires are used or not can be adjusted by changing whether the external leading-out terminals are immersed into the conductive liquid in the external liquid tank or not, so that the power of the whole resistor unit can be adjusted.

A frame terminal 8 is bent so that its cross-sectional shape is an S-shape, and such that separation distances L1, L2 and L3 in a horizontal direction between an uppermost portion and a lowermost portion, in the vertical direction, of an end portion side face 21a of a resistance element 8 built into a mold divider 1, and a part substantially midway between an uppermost point and a lowermost point thereof, and the parts of the surface of the frame terminal 6 that correspond to these parts in the horizontal direction satisfy the relation L1>L2≥L3. As a result, in the mold divider 1, a space which is to be filled with a joining material and which has a non-uniform separation distance is formed between the frame terminal 6 and the end portion side face 21a, thereby making it possible to ensure the bonding strength between the resistance element 8 and the frame terminal 6.

The invention discloses a film platinum resistor temperature sensor, which comprises an aluminum oxide insulating substrate, a titanium film, a platinum film resistor layer, a protective layer, a platinum metal lead and encapsulating slurry, the titanium thin film is deposited on the surface of the aluminum oxide insulating substrate, the platinum thin film resistance layer is deposited on the surface of the titanium thin film, the protection layer is deposited on the surface of the platinum thin film resistance layer, the platinum metal lead is welded on a bonding pad on the platinum thin film resistance layer, and the packaging slurry is coated on the protection layer and the platinum thin film resistance layer. According to the invention, the platinum film temperature sensor with high precision, good consistency, wide temperature measurement range and strong stability is obtained through arrangement and allocation of a multi-layer structure.

The invention belongs to the technical field of production of special materials for electrical equipment, and provides a carbon ceramic resistor and a preparation method and application thereof in view of problems existing in the prior art. Composite conductive particles are uniformly dispersed in a ceramic matrix of the carbon ceramic resistor; the composite conductive particles comprise conductive carbon and aluminum oxide and are provided with hierarchical pores; the conductive carbon is constructed in the hierarchical porous composite conductive particles, and the dispersion of the carbon material is adjusted into the dispersion and distribution of the composite conductive particles in the ceramic matrix, so that the carbon material is more uniformly distributed in the carbon ceramic resistor; the phenomenon that conductive filler is prone to agglomeration due to the fact that a conductive carbon material is directly mixed with a ceramic material in a traditional method is avoided, meanwhile, due to the existence of aluminum oxide, interface bonding of the composite conductive particles and the ceramic matrix is tighter, and the overall conductive performance, strength and stability of the carbon ceramic resistor can be improved.

The present invention provides: a copper alloy material which has excellent press punchability, has a volume resistivity within a desired range, has a thermal electromotive force against copper having a small absolute value, and has a temperature coefficient of resistance of 0 or a negative number having a small absolute value over a wide temperature range from a normal temperature (for example, 20° C) to a high temperature (for example, 150° C); and a resistive material for resistors, a resistor, a material for heating elements, and a heating element, each using said copper alloy material.　This copper alloy material has an alloy composition that contains from 7.0% by mass to 17.0% by mass of Mn, from 0.1% by mass to 3.0% by mass of Ni, and from 1.0% by mass to 5.0% by mass of Al, with the balance being made up of Cu and unavoidable impurities, and has a Vickers hardness (HV) within the range of 105 to 250. The resistive material for resistors and the material for heating elements are composed of this copper alloy material. The resistor comprises this resistive material for resistors. The heating element comprises this material for heating elements.

The invention discloses a composite metal foil, a metal-clad laminated board and a circuit board. The composite metal foil includes: a resistive layer; the resistance layer has a temperature coefficient, and the activation energy of the resistance layer is 0.6-9.2 * 10 <-2 > eV. According to the embodiment of the invention, heating monitoring and even feedback adjustment of the electronic component can be realized, and the thermal management precision is high.

The invention discloses a graphite ceramic resistor doped with carbon nanotubes, which comprises a graphite ceramic matrix, and the graphite ceramic matrix is internally provided with uniformly dispersed carbon nanotubes. The preparation method of the carbon nanotube-doped graphite ceramic resistor comprises the following steps: S1, preparing raw materials; s2, dispersing the carbon nano tube; s3, mixing and forming; s4, sintering; and S5, post-processing. The carbon nanotubes are doped in the graphite ceramic matrix, so that the electrical conductivity, thermal stability and mechanical strength of the resistor are remarkably improved, the problem that an existing graphite ceramic resistor is unstable in performance in high-temperature, high-pressure and corrosive environments is solved, and the preparation method is simple, low in production cost, suitable for industrial large-scale production and suitable for industrial large-scale production. The cable is suitable for high-temperature, high-pressure and corrosive environments, such as the fields of high-speed rails, subways, rail transit equipment, high-voltage power transmission and transformation and the like.

The embodiment of the invention provides a surge protector and a surge protection device. The surge protector comprises: a housing comprising a line pin and a grounding pin; a surge protection component accommodated in the housing and coupled to the ground pin, the surge protection component having a width smaller than a height and a length so as to be flat; the tripping assembly comprises a fusing part which is arranged in the shell and is integrally positioned on one side of the surge protection part in the height direction, and the fusing part is coupled to the circuit pin and is electrically connected to the surge protection part through solder; and a separating member coupled between the fusing member and the surge protection member via an elastic member and adapted to move to a tripping position when the solder melts. According to the surge protector disclosed by the embodiment of the invention, the tripping assembly and the surge protection component are arranged up and down along the height direction, so that the height space of the module is fully utilized, the occupation of the width space is reduced, and the formation of the ultrathin surge protector is facilitated.

The invention relates to a multi-element high-entropy oxide thermal sensitive ceramic, a thermistor and a preparation method and application of the multi-element high-entropy oxide thermal sensitive ceramic, oxides with different valence states are used as initial raw materials, a binary spinel phase powder material is synthesized in advance, and then ball-milling mixing, grinding, calcining, cold isostatic pressing forming and sintering are performed to obtain the high-entropy oxide thermal sensitive ceramic. The thermistor is obtained through the thermal sensitive ceramic, the thermistor has obvious NTC (Negative Temperature Coefficient) characteristics at-75 DEG C to 75 DEG C, and the electrical property parameters of the thermistor are as follows: B25 / 50 is equal to 3600K to 4900K, rho25 is equal to 1.95 * 10 < 4 > omega.cm to 6.13 * 10 < 6 > omega.cm, and the aging drift rate is less than or equal to 0.05% when the thermistor is aged at 125 DEG C for 500h. The thermal sensitive ceramic and the thermistor are stable in performance and good in consistency, the electrical performance parameters of the thermal sensitive ceramic and the thermistor can be regulated and controlled by adjusting the type of the binary spinel phase powder material, and the thermal sensitive ceramic and the thermistor are suitable for manufacturing the thermistor for ocean temperature measurement.

The invention provides a buried resistor, a manufacturing method thereof and a printed circuit board. The manufacturing method comprises the following steps: providing an inner-layer substrate; cutting the inner-layer substrate, laminating a thin dry film on the surface of one side of the copper layer of the inner-layer substrate, performing first patterning treatment, etching to remove the copper layer and the resistive layer which are not protected by the thin dry film after the first patterning treatment, and stripping the thin dry film to obtain a first semi-finished product; pressing a thick dry film on the surface of one side of the copper layer of the first semi-finished product, then carrying out second patterning treatment, then etching to remove the copper layer which is not protected by the thick dry film after the second patterning treatment, and stripping the thick dry film to obtain a second semi-finished product; and depositing a layer of solder resist ink at the etched part of the copper layer of the second semi-finished product to enable the solder resist ink to cover the exposed resistive layer, then performing resistance inspection, and then laminating a high-frequency material layer on the surface of the solder resist ink to obtain the buried resistor. According to the invention, the protection of the buried resistor and the effective control of the resistance value of the buried resistor are realized.

The invention belongs to the technical field of production of special materials for electrical equipment, and provides a carbon ceramic resistor containing a continuous conductive interlayer and a preparation method and application of the carbon ceramic resistor containing the continuous conductive interlayer. The hierarchical pore structure is filled with the continuous ceramic filling layer and the continuous carbon conductive layer, and the continuous carbon conductive layer is located between the continuous ceramic support body and the continuous ceramic filling layer to form an interlayer, so that the conductive carbon material can be uniformly dispersed in the ceramic support body, and the phenomenon of non-uniform dispersion and distribution of the carbon material is solved; therefore, the continuous carbon conductive layer is continuously penetrated in the ceramic support body to form a three-dimensional conductive network structure.

An apparatus is provided. The apparatus includes a first resistor stack having a first temperature coefficient. The apparatus also includes a second resistor stack coupled to the first resistor stack having a second temperature coefficient different than the first temperature coefficient. The apparatus further includes a measurement circuit associated configured to determine a temperature of the apparatus based on a differential between a first voltage across the first resistor stack and a second voltage across the second resistor stack and determine a set of resistances of a field-effect transistor (FET) that is coupled to the apparatus based on additional differentials between additional voltages across the first resistor stack and the second resistor stack.

The invention belongs to the technical field of production of special materials for electrical equipment, and particularly relates to a ceramic resistor containing a continuous conducting layer and a preparation method and application thereof. According to the preparation method provided by the invention, the conductive material is deposited in the fibrofelt supporting layer by adopting vacuum impregnation-air pressure sintering, then the ceramic material is deposited in the supporting layer containing the conductive layer by adopting vacuum impregnation-air pressure sintering, and all the structural layers are continuously communicated to form the novel ceramic resistor. According to the invention, the fibrofelt is used as the supporting layer, and the carbon nanotubes can be uniformly and continuously dispersed through in-situ generation of the carbon nanotubes in the supporting layer, so that a conductive channel is formed, and the resistivity is effectively reduced; meanwhile, the fiber felt is impregnated with ceramic mixed slurry and is subjected to air pressure sintering, so that the apparent porosity can be effectively reduced, and the volume density is increased. Therefore, the ceramic resistor prepared by the invention has good electrical properties, excellent mechanical properties and good use stability, and is suitable for industrial application as a closing resistor material.

The utility model is applicable to the technical field of resistor production, and provides a precision sampling alloy resistor, which comprises a carrier and four pins, two pins are respectively arranged on two sides of the carrier, a gap is formed between the two pins on the same side, and the four-pin structure enables the alloy resistor to have more stable support, can better bear the load of current, and is more stable in performance. The stability and the reliability of the system are improved; one of the two pins on the same side is used for connecting a current lead, the other pin is used for connecting a voltage sampling lead, meanwhile, a four-wire detection circuit is adopted, two current leads are used for transmitting current, and the other two voltage sampling leads are used for measuring voltage, so that the influence of lead resistance on current measurement can be eliminated, and the sampling precision is improved.

A laminated ceramic electronic component capable of improving bias characteristics while maintaining ferroelectricity. [Solution] The multilayer ceramic electronic component has a core portion and a shell portion covering the core portion, and has a dielectric layer containing a plurality of crystal grains in which calcium is dissolved in the shell portion and the calcium concentration in the shell portion is 10 times or more higher than the calcium concentration in the core portion, the dielectric layer being sandwiched between internal electrodes containing nickel or copper as a main component, and an external electrode electrically connected to the internal electrode.

This ceramic substrate is provided with a base material that contains a sintered body of ceramic particles and a coating that contains a sintered body of alpha-alumina particles. The coating covers at least a part of the surface of the base material. The average particle diameter of the alpha-alumina particles is smaller than the average particle diameter of the ceramic particles.