614results about "Non-adjustable resistors" patented technology

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 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.

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 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 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 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 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.

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.

The utility model relates to a high-power box-type liquid-cooled brake resistor, the resistor takes away heat through cooling liquid, the resistor comprises a shell, a resistor unit and a mounting plate, the mounting plate is mounted in the shell, the resistor unit is mounted on the mounting plate, the resistor further comprises a water inlet, a water outlet, a water passing plate and a water channel, the water inlet and the water outlet are installed on the shell, the water passing plate and the water channel are installed inside the shell, the water channel is connected with the water passing plate, one end of the resistor unit is placed in the water channel, and the cooling liquid sequentially passes through the water inlet, the water passing plate, the water channel and the water outlet. According to the utility model, the water channel is arranged, the integrated flow guide (anti-backflow design) design is adopted in the shell, the cooling liquid passes through the tubular resistor from bottom to top, and the temperature controller and the pressure monitoring instrument are arranged, so that the heat dissipation function is exerted to the utmost extent; by arranging the reinforcing ribs, the pressure bearing capacity of the shell can be enhanced, and the deformation amount of the shell in the working pressure bearing process is reduced.

The invention relates to the technical field of resistance paste, and provides resistance paste and a preparation method thereof. Wherein the resistance paste comprises 75-105 parts of a conductive filler, 0.5-5 parts of a high-temperature heat-resistant agent, 5-15 parts of glass powder and 15-33 parts of an organic carrier; the conductive filler contains nano silver powder. According to the resistance paste provided by the invention, the added conductive filler serves as a core component of the resistance paste and is used for forming a continuous and compact conductive network, and the contained nano silver powder can remarkably reduce the sintering temperature of the resistance paste, promote the sintering compactness and enhance the adhesive force, so that the stability and reliability of a resistor are improved; the high-temperature heat-resistant agent has an extremely high heat-resistant temperature, so that the heat stability, the service life and the reliability of the resistor can be remarkably improved; the glass powder can improve the compatibility of the slurry and a base material, effectively prevents cracking and layering caused by sintering, and can form a more compact protection layer, thereby inhibiting silver oxidation and improving the corrosion resistance of the resistor.

To provide a resistor which can ensure insulation quality of a resistor element while reducing the number of components.SOLUTION: A resistor 100 comprises: a case 1; and a resistor element 2 having a resistor body 21 which is housed in the case 1, a pair of terminal parts 22 which are provided on the resistor body in such a manner that part of them protrudes from the case 1, and a resistor wire 23 which is wound around the resistor body 21. The resistor body 21 has: a winding core 211 around which the resistor wire 23 is wound; and a pair of terminal installation parts 212 each of which is provided on each of both ends of the winding core 211 so that each of the pair of terminal parts 22 may be installed. Each of the terminal installation parts 212 has a pair of first facing parts 212a each of which faces each of a pair of first peripheral walls 121 of the case 1. The winding core 211 has a pair of lateral flat surfaces 211a each of which faces each of the pair of first peripheral walls 121 and is recessed from each of the pair of first facing parts 212a.SELECTED DRAWING: Figure 7

The invention relates to a carbon composite ceramic linear resistor and a preparation method and application thereof. The preparation method of the carbon composite ceramic linear resistor provided by the invention comprises the following steps: uniformly mixing aluminum oxide, clay and nano carbon black to obtain mixed powder; determining the mass of the powder based on the volume of a mold cavity of a mold and the target density of the carbon composite ceramic linear resistor, accurately weighing the mixed powder according to the calculated mass of the powder, filling the mixed powder into the mold, and carrying out hot pressed sintering to obtain a sample; and carrying out surface treatment on the sample to obtain the carbon composite ceramic linear resistor. Compared with a carbon ceramic resistor disc sintered at normal pressure, the density and porosity of the resistor disc are accurately controlled through fixed mold hot pressing, the resistivity is accurately controlled, the preparation method is simple, the cost is low, the yield is remarkably increased, and the carbon ceramic resistor disc is favorably put into actual industrial production.

This chip resistor is provided with a ceramic substrate, two electrodes that are disposed on the ceramic substrate, and a resistor that electrically connects the two electrodes. The ceramic substrate comprises a base material that contains a sintered body of ceramic particles (A) and a covering that contains a sintered body of α-alumina particles (B). The covering covers at least a part of the surface of the base material. The average particle diameter of the α-alumina particles (B) is smaller than the average particle diameter of the ceramic particles (A). The ceramic substrate has a support surface, the support surface-side surface of the base material is covered with the covering, and the resistor overlaps the support surface.

To improve the moisture resistance reliability of a multilayer electronic component.SOLUTION: A multilayer electronic component 100 includes a dielectric layer 111, internal electrodes 121 and 122 disposed alternately with the dielectric layer, connection parts P1a and P2a disposed on third and fourth surfaces facing each other in a second direction of a main body 110 with a hexahedron shape, and external electrodes 131 and 132 including band parts P1b and P2b extending to a part of first and second surfaces facing each other in a first direction from the connection parts. The external electrodes are formed of base alloy layers 131a and 132a disposed in the band parts and containing a Cu-Ag alloy, lower electrode layers 131b and 132b containing Cu, and upper electrode layers 131c and 132c containing Ag and glass.SELECTED DRAWING: Figure 3

A temperature measuring device according to an embodiment of the present invention comprises: a power input unit; a thermistor electrically connected to the power input unit; a first resistor connected in series with the thermistor; and a second resistor connected in parallel with the thermistor.

A resistor includes a substrate, a first electrode, a resistive layer, a second electrode, and an insulating layer. The substrate surface has a first side and a second side opposite to each other in a first direction. The first electrode is arranged on the surface of the substrate and comprises a first end portion located on the first side and a first extending portion which is connected with the first end portion and extends towards the second side. The resistive layer is disposed on the first electrode. The second electrode is arranged on the resistance layer and comprises a second end portion located on the second side and a second extending portion which is connected with the second end portion and extends towards the first side. The insulating layer is disposed on the second electrode and covers the first extension portion, the resistive layer and the second extension portion. The resistor has a trench pattern extending in a first direction, the trench pattern extending through the insulating layer, the second electrode, and the resistive layer on a normal to the substrate. The resistor can help to control the resistance value and improve the yield.

To provide a manufacturing method of a multilayer electronic component capable of suppressing the occurrence of short circuits between internal electrodes, and deformation of a dielectric green sheet.SOLUTION: A manufacturing method of a multilayer electronic component comprises the steps of: arranging, at a first gap g1 on a first dielectric green sheet 211, first internal electrode patterns including a first main part 221a and a first convex part 221b that is thicker than the first main part, and applying a first dielectric paste 211' to the first gap to form a first sheet S1; forming a second sheet S2 in a similar manner; and alternately arranging the first and second sheets to form a laminated bar, and cutting the laminated bar, and forming external electrodes. Therein in the step of forming the laminated bar, the first sheet is arranged so that the first dielectric paste faces downward in a lamination direction, and the second sheet is arranged so that the second dielectric paste faces upward in the lamination direction.SELECTED DRAWING: Figure 4

This application relates to the field of thermistor materials technology, specifically disclosing a high resistivity, low B-value thermistor material, a chip resistor, and a method for preparing the same. The high resistivity, low B-value thermistor material provided in this application comprises a base material and 2-10% by weight of additives; the base material comprises Mn3O4, Co3O4, SrO, ZnO, and TiO2 in a weight ratio of (10-40):(5-15):(20-60):(5-10):(1-15); the additives comprise CaO, Fe2O3, and SiC in a weight ratio of (5-20):(10-50):(9-35); this application also provides a chip resistor made using the above-mentioned thermistor material. The chip resistor obtained in this application has high resistivity and a low B-value, which can meet the requirements for use in negative temperature coefficient thermistors.