Abstract:
An ESD protection device includes opposed electrodes in a ceramic base material and a discharge auxiliary electrode in contact with each of the opposed electrodes which is arranged so as to provide a bridge from the opposed electrode on one side to the opposed electrode on the other side, the discharge auxiliary electrode includes metallic particles, semiconductor particles, and a vitreous material, and bonding is provided through the vitreous material between the metallic particles, between the semiconductor particles, and between the metallic particles and the semiconductor particles. The metallic particles have an average particle diameter X of about 1.0 μm or more, and the relationship between the thickness Y of the discharge auxiliary electrode and the average particle diameter X of the metallic particles satisfies about 0.5≦Y/X≦ about 3.
Abstract translation:ESD保护装置包括陶瓷基材中的相对电极和与每个相对电极接触的放电辅助电极,其布置成提供从一侧的相对电极到另一侧的相对电极的桥, 放电辅助电极包括金属颗粒,半导体颗粒和玻璃质材料,并且通过金属颗粒之间,半导体颗粒之间以及金属颗粒和半导体颗粒之间的玻璃质材料提供接合。 金属颗粒的平均粒径X为约1.0μm以上,放电辅助电极的厚度Y与金属粒子的平均粒径X之间的关系为约0.5< 1lE; Y / X& 约3。
Abstract:
A device may include a metal-oxide varistor (MOV), wherein the MOV increases in temperature as a voltage applied across the MOV exceeds a rated voltage. The device may include a first conductor contacting the MOV and a second conductor contacting the MOV. The second conductor may be configured to disconnect from the MOV when the MOV reaches a threshold temperature. The device may include an enclosure to surround the MOV, the first conductor, and the second conductor, wherein the enclosure includes a non-conductive fluid to suppress arcing.
Abstract:
A composition of voltage switchable dielectric (VSD) material that comprises a concentration of core shelled particles that individually comprise a conductor core and a conductor shell, so as to form a conductor-on-conductor core shell particle constituent for the VSD material.
Abstract:
A metal oxide varistor integrally formed with a heat protection structure that will automatically go to open circuit in conditions of overheating due to sustained over-voltages. The metal oxide varistor integrally formed with a heat protection structure has a body, an insulation bracket, a number of terminals and a fuse. The insulation bracket is deposited on the body and has a number of slots. The fuse connects to the body and one of the terminals. The fuse is mounted one of the slots of the insulation bracket. The fuse reacts to the overheating timely and the melting fuse spreads quickly with the assistance of capillary action evolved by the slots of the insulation bracket to speed up the action to go to open circuit in against damage due to sustained over-voltages.
Abstract:
The present disclosure includes a varistor that protects a system from abnormal energy transients. The varistor has a core, a first electrode, a second electrode, a first electrical lead, and a second electrical lead. The core has a first flat side and a second flat side as well as opposing first and second outer side regions. The first electrode is deposited on a majority of the first flat side of the core and has a center region and an outer region. The second electrode is deposited on a majority of the second flat side of the core and has a center region and an outer region. The first electrical lead is attached to the outer region of the first electrode at a first attachment point. The second electrical lead is attached to the outer region of the second electrode at a second attachment point. The first attachment point is adjacent to the first outer side region of the core and the second attachment point is adjacent to the second outer side region of the core. The invention also includes a method of making such a varistor.
Abstract:
The manufacturing method for an electroceramic component (1), for example a varistor (1), comprises a laser irradiation of a part (5; 6) of the surface of an electroceramic body (2) before a metallization (3; 4) is applied to the part (5; 6) of the surface. By means of the laser irradiation it is possible to produce a micro-roughness and/or a chemical modification of the surface which permits good adhesion of the metallization, and it is possible to reduce or eliminate areas of unevenness or waviness of that part (5; 6) of the surface of the electroceramic body (2) which is to be metallized. In addition, improved transverse conductivity can be produced, by virtue of which a low contact resistance and a very homogeneous current distribution is achieved, in particular near to the metallization (3; 4). In addition it is possible to remove residues which originate in particular from a sinter support or from the application of a passivation layer. After the laser irradiation, the electroceramic body advantageously has a border (9) which adjoins the part (5; 6) of the surface and which is not laser-irradiated. The laser beam can advantageously be pulsed and focused.
Abstract:
Metal oxide varistors (MOVs) are employed in surge protection devices, such as overvoltage protection devices, between a pair of signal lines and ground to reduce the capacitive imbalance introduced by the overvoltage protector, thereby improving higher frequency transmissions over twisted-pair telephone lines. The MOVs are sorted into subgroups having a capacitive tolerance of no more than about 1.0 picofarad. MOVs with asymmetrical electrodes can also be sorted to reduce both the capacitance and the capacitive tolerance of the MOVs. The sorted MOVs can then be electrically connected in parallel with a gas discharge tube on each signal line to produce an overvoltage protection device, for example a station protector for use at a customer premises, having a capacitive imbalance that does not exceed about 1.3 picofarads. The use of asymmetrical electrodes reduces the capacitance of the sorted MOVs to less than about 30 picofarads.
Abstract:
The present invention relates to making sensors by cutting pieces from a boule or ingot of a metal oxide single crystal. The sensors produced are also described.
Abstract:
The invention is a MOV based surge arrester that uses MOVs manufactured from a recently patented process. These new technology MOVs are significantly more uniform in their composition, resulting in more uniform performance. Each MOV is packaged by placing it between a pair of contact plates, preferably manufactured from aluminum. This packaging significantly increases the surface area between the contact plates and the MOVs. Wiring is minimized. Also, the use of the metal plates increases the ability of a surge suppresser to remove the heat generated in severe over-voltage situations. The preferred embodiment teaches conductor wires soldered to a disk in a grid pattern. The grid pattern provides a low empedance connection and prevents failure of the MOV at a lower than expected voltage. Grid patterns can include spiral, serpentine S, and square patterns.
Abstract:
Composite materials which contain small particles of metal or metal oxide an oxide matrix are prepared by a process which comprises a) subjecting (1) one or more metal compounds and (2) one or more bifunctional compounds which contain at least one group capable of complexing the metal and at least one group which forms an inorganic network during the polycondensation, and if appropriate (3) one or more network-forming agents which are capable of polycondensation to the conditions of a complexing reaction and hydrolytic polycondensation by the sol-gel process in a liquid reaction medium, compounds (1), (2) and (3) being soluble in the reaction medium, and b) oxidizing the resulting polycondensate to form a composite material which contains small metal oxide particles with the very narrow particle size distribution in an oxide matrix, and if appropriate c) reducing the metal oxide particles of the resulting composite material to the metal. These composite materials are used as catalysts and in electrical or electronic components.