39 results about "Sensistor" patented technology

An electrically operated scented wax holder that forms a receptacle for receiving unmelted blocks of wax which are heated to the melting point and thereafter maintained at a safe temperature by a temperature-regulated electrical heating element. The wax receptacle is removable mounted on a base section that houses a positive temperature coefficient (PTC) thermistor which has a transition temperature substantially higher than the melting point of the wax to insure that the wax is rapidly melted, but substantially below the temperature that would constitute a danger to a human who might touch the exterior surface of the warmer, or constitute a fire hazard. The heating element is preferably placed in thermal contact with a contact pad having high thermal conductivity that is in turn placed closely adjacent to the wax receptacle, thereby efficiently transferring heat from the electrically operated temperature regulated heating element to the wax in the receptacle. A switch is positioned to de-energize the heating element whenever the wax receptacle is removed from the base section, and a visible pilot light is illuminated whenever the heating element is energized.

Disclosed are a positive temperature coefficient material, a preparation method thereof, a positive temperature coefficient thermistor including the positive temperature coefficient material and a preparation method thereof. The material is a product formed by a mixture through melting; the mixture comprises resin, conductive filling, non-conductive filling, promoter and cross-linking agent, wherein, the mixture also comprises additives; and the additives are selected from silicon dichloride, sodium fluoride and carbon tetrachloride. The positive temperature coefficient material is provided with good stability and the output power of the positive temperature coefficient material is slowly attenuated along with the increase of the switching movement times, so that the thermistor prepared with the positive temperature coefficient material is provided with good room temperature resistance stability and PTC intensity stability after the thermistor is frequently used.

A motor includes a casing and a holder which support a rotation shaft. A concave groove is formed in the holder near the inner periphery of the holder. The concave groove accommodates a positive temperature coefficient thermistor functioning as an overcurrent protection device. A tapered cutout surface is formed on the outer wall of the holder so that the cutout surface is inclined at 45 degrees with respect to a line passing through the rotation shaft and the groove portion of the holder has a maximum length of the holder in its axis direction. A multi-direction input device includes these two motors functioning as driving sources to provide a force feedback to an operation lever. The first and second motors are disposed such that lines passing through their rotation shafts are orthogonal to each other and cutout surfaces are opposed to each other with an intersection of the lines therebetween.

The invention relates to a macromolecular positive temperature coefficient thermosensitive resistor which comprises a sheet core, metal foils adhering on two sides of the sheet core, and sheet or lead-shaped metal electrodes welded on outer surfaces of the metal foils; the core is blended by macromolecule polymer, conductive fillings, inorganic fillings and processing material which are distributed according to weight percentage as follows: 35-65% of macromolecule polymer, 35-65% of conductive fillings, 0-20% of inorganic fillings and 0.1-5% of processing material. The invention is characterized in that the macromolecular positive temperature coefficient thermosensitive resistor has low cost; ball grinder pre-mixing process is employed in the technique to improve evenness of room-temperature resistance value of the macromolecular positive temperature coefficient thermosensitive resistor and uniformity of resistance lift after performing current resisting, voltage resisting and the like, thereby improving rate of pass of the product.

A microwave sintering method of posiode and special hardware belong to the preparation method field of electronic heating element. The microwave sintering method comprises the following art procedures: a posiode green ware body of the series of barium titanate made by the prior art is placed into a crucible and a sintering special thermal insulator, and then the whole is placed into a micro-wave oven to sinter; the sintering procedure is that the speed of temperature rise is controlled between 5 degrees per minute and 100 degrees per minute, after the temperature is up to 1100 degrees to 1300 degrees, the whole is kept at a constant temperature for 5 to 60 minutes, and then the whole is cooled down to the room temperature at the cooling rate of 3 to 30 degrees per minute; the special hardware is a sintering special thermal insulator arranged in the micro-wave oven body, the sintering special thermal insulator comprises a fibre thermal insulator in the outer layer and a thermal insulator in the sub outer layer; a fibre insulation ball packed layer is arranged between the thermal insulator in the sub outer layer and the crucible in the inner layer. The invention is of short cycle of sintering art, good quality of products and high rate of finished products, thereby improving the production benefit and saving energy sources.

The invention relates to a method for manufacturing a thermosetting positive temperature coefficient thermistor and conductive adhesive therewith. The method comprises the following steps of: coating conductive adhesive on one side of a metal foil, eliminating solvent by roasting for 120-600 seconds at 120-200 DEG C to obtain a conductive semi-solid sheet, and controlling the gelation time of the semi-solid sheet at 170 DEG C hot plate/70-110 seconds; oppositely superposing and sticking two semi-solid sheets with the same size at the conductive adhesive coating surfaces and carrying out hot pressing and full solidifying to form a solid sheet; and cutting the solid sheet into chips with proper size, welding conductive pins on the surfaces of the metal foils of the chips to obtain the thermosetting positive temperature coefficient thermistor. The method induces a semi-solid sheet manufacturing procedure, so that the controllability of semi-solid epoxide resin is enhanced, and finished product with low electrical resistivity, good uniformity and excellent reliability can be obtained by combining semi-solidifying degree and the hot press process.

A semiconductor ceramic includes a Ba_mTiO₃-based composition, as a main component, having a perovskite structure represented by general formula A_mBO₃, wherein part of Ba constituting the A site is replaced with Na, Bi, Ca, and a rare-earth element having an ionic radius smaller than that of the Na; the content of the rare-earth element when the total number of moles of the elements constituting the A site is 1 mole is 0.0005 to 0.015 on a molar basis; and the content of the Ca when the total number of moles of the elements constituting the A site is 1 mole is 0.05 to 0.20 (preferably 0.125 or more and 0.175 or less) on a molar basis. A PTC thermistor includes a component body 1 formed of the semiconductor ceramic. Accordingly, high reliability is achieved even if an alkali metal element is present.

The disclosed manufacture method for high-resistance multicrystal sensistor in high-voltage IC comprises: using the non-silicatized in-situ doped-arsenic multicrystal grid material as the resistance element; etching the high-resistance area and the grid; finally, taking the thermal process after material sedimentation. This invention can obtain 1000omega block resistance element.

The invention provides a compressor starting circuit which comprises a positive temperature coefficient thermistor PTC, a bidirectional thyristor TR1, a triggering circuit and a control circuit, wherein the positive temperature coefficient thermistor PTC is connected with a T1 end of the bidirectional thyristor TR1; the positive temperature coefficient thermistor PTC and a G end of the bidirectional thyristor TR1 are respectively connected with the triggering circuit; and the triggering circuit and a T2 end of the bidirectional thyristor TR1 are respectively connected with the control circuit. The invention further provides a refrigerator. The compressor starting circuit and the refrigerator which are provided by the invention have the beneficial effects of solving the problem of power consumption of the starting circuit after a compressor of the refrigerator is started up, and implementing zero power consumption.

A semiconductor ceramic includes a Ba_mTiO₃-based composition, as a main component, having a perovskite structure represented by general formula A_mBO₃. The molar ratio m between the A site and the B site satisfies 1.001≦m≦1.01. Part of Ba constituting the A site is replaced with Bi, Ca, a rare-earth element, and Na. The molar content of the Ca when the total number of moles of the elements constituting the A site is 1 mole is 0.05 to 0.20 (preferably 0.125 to 0.175). A PTC thermistor includes a component body formed of the semiconductor ceramic. Accordingly, there is provided a lead-free semiconductor ceramic that substantially does not contain lead and that has desired PTC characteristics and high reliability.

The invention relates to a production technology of an exciter coil. The production technology comprises the following steps: 1) using NMN composite insulation paper to cover an insulation layer outside the stainless steel pipe of an exciter, binding one layer of mica tape outside NMN, tightly binding a heat-shrinkable belt to the outside of the mica tape; 2) binding 5-15 layers of polyester inferior amine lacquered wires outside the heat-shrinkable belt, wherein one layer of imine film is placed between each two adjacent polyester inferior amine lacquered wires and one layer of alkali-free glass tape is covered outside the outermost polyester inferior amine lacquered wires; 3) distributing three sections of coils outside the stainless steel pipe of the exciter, electrically connecting the coils in series, sleeving varnished cloth pipes outside the series wires of the coils, placing a sensistor on the outer layer of the middle coil to obtain a semi-finished product; and 4) soaking the entire semi-finished product in ET-90A insulating varnish once, wherein varnish is avoided to enter in the stainless steel pipe of the exciter during soaking. The prepared product has good insulating property, excellent electrical properties and long service life.

The purpose of the present invention is to provide: a semiconductor ceramic having excellent pressure resistance; and a positive temperature coefficient thermistor element produced using the semiconductor ceramic. A semiconductor ceramic, which constitutes a component base (11) of a positive temperature coefficient thermistor element (1), contains a compound represented by the general formula (Ba1-(x+y+z)/100Cax/100Sry/100Smcz/100)TiO3 (wherein Smc represents an agent capable of making materials semiconductive) as the main component, and is characterized in that Mn is contained in an amount of t part by mole relative to 100 parts by mole of the main component, x, y and t fulfill the relationship represented by the formulae 2.500 <= x <= 20.000, 0.000 <= y <= 5.000, 2.500 <= x+y <= 20.000 and 0.030 <= t <= 0.150, and z is equal to or greater than an amount of the agent for making materials semiconductive (Smc) at which the specific resistance becomes minimum in a curve that is defined by x, y and t and shows the relationship between the amount of the agent for making materials semiconductive (Smc) and the specific resistivity.

The invention provides a polymer-based positive temperature coefficient thermistor composite material and a preparation method and application thereof. The polymer-based positive temperature coefficient thermistor composite material comprises a polymer matrix and a conductive agent, wherein the mass ratio of the polymer matrix to the conductive agent is 1: 40-1: 1. By adjusting the content of the monomer in the composite material, the initial action temperature of the PPTC safety electrode is regulated and controlled. The invention also provides a lithium ion battery based on the PPTC safety electrode, and the lithium ion battery can completely pass a safety test. According to the method disclosed by the invention, the initial action temperature of the PPTC material can be adjusted according to actual requirements, and exemplarily, the melting point temperature of PVDF is about 160 DEG C under general conditions, and according to the method disclosed by the invention, the initial action temperature of the PVDF-based PPTC material can be adjusted to 110-150 DEG C.

The invention discloses a server BIOS flash memory chip protection circuit and a server. The circuit comprises a chip slot, the chip slot is provided with a power supply pin position and a grounding pin position, and the grounding pin position is grounded; a BIOS (Basic Input/Output System) flash memory chip, wherein the BIOS flash memory chip is inserted into the chip slot; a positive temperature coefficient thermistor, the first end of the positive temperature coefficient thermistor is connected with a power supply, and the second end of the positive temperature coefficient thermistor is connected with the power supply pin so as to supply power to the BIOS flash memory chip through the positive temperature coefficient thermistor. According to the scheme, the positive temperature coefficient thermistor is connected in series between the power supply pin of the chip slot and the power supply, so that overcurrent protection is realized when the BIOS flash memory chip is short-circuited, the BIOS flash memory chip is protected, the positive temperature coefficient thermistor does not need to be replaced repeatedly, the structure is simple, and excessive layout space is not occupied.

This invention relates to a process method for a positive temperature coefficient resistor (PTCR) with multiple lead-out ends and its products used in over current, over voltage and over temperature protection elements of electronic circuits. This invented product has three or more electrode regions outgoing three or more than three lead-out ends realizing almost stable current under different environment temperatures for a thermistor and different hold currents under a definite temperature.

The invention relates to a positive temperature coefficient thermistor composite material and a preparation method thereof. Immersing the prepared BaTiO3-based positive temperature coefficient thermistor porous ceramic chip into a mixed solution of hydrochloric acid, aniline and ammonium persulfate, stirring for 2-12 hours, after stirring is completed, taking out the porous ceramic chip immersed into the mixed solution, standing for 2-20 hours, washing with deionized water, drying, and grinding off a polyaniline film on the surface to obtain the BaTiO3-based positive temperature coefficient thermistor porous ceramic chip. The positive temperature coefficient thermistor composite material sheet is prepared. Ohmic contact electrodes are prepared on upper and lower parallel planes of the positive temperature coefficient thermistor composite material sheet for resistance and resistance temperature characteristic testing. The room temperature resistivity of the positive temperature coefficient thermistor composite material disclosed by the invention is obviously reduced, and meanwhile, the positive temperature coefficient thermistor composite material has a relatively high lift-to-drag ratio. And the application field and range of the positive temperature coefficient thermistor material are expanded.

The invention belongs to the field of lightning protection equipment, and discloses a surge protector with multi-channel protection. The surge protector is provided with two ends connected with an external circuit and is provided with a main channel and an auxiliary channel which are connected between the two ends in parallel, surge passing through the two ends flows through the main channel and the auxiliary channel at the same time,a first varistor is arranged on the main channel, a second varistor and a third varistor which are connected in series are arranged on the auxiliary channel, the surge resistance of the first varistor is higher than that of the second varistor and that of the third varistor , and the surge impact resistance of the third varistor is higher than that of the second varistor ; and a positive temperature coefficient thermistor arranged in the thermal protection structure is thermally coupled with a thermal tripping structure through the structure. The surge is discharged through the main channel and the auxiliary channel, and the purpose of fixed-point failure is achieved according to different current density distribution, so that the surge discharge resistance of the auxiliary channel is reduced, and the production cost is reduced.