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Trisil
Trisil is a trade name for a thyristor surge protection device, an electronic component designed to protect electronic circuits from overvoltage. Unlike a transient voltage suppression diodes, such as Transil, Trisil acts as a crowbar device, switching ON when the voltage across it exceeds its breakover voltage. Overview A Trisil is bidirectional, behaving the same way in both directions. It is principally a voltage-controlled triac without gate. The behavior of a Trisil is similar to a SIDAC, but unlike SIDAC, Trisil devices are commonly used to protect circuits from overvoltage.They act faster and can handle more current. In 1982, the only manufacturer was Thomson SA; a successor company, ST Microelectronics continues to make the devices. This type of crowbar protector is widely used to protect telecom equipment from lightning-induced transients and power line-induced currents. Other manufacturers of similar devices include Bourns (TISP) and Littelfuse (SIDACtor). Instead ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transil
A transient-voltage-suppression (TVS) diode, also transil, transorb or thyrector, is an electronic component used to protect electronics from voltage spikes induced on connected wires. Description The device operates by shunting excess current when the induced voltage exceeds the avalanche breakdown potential. It is a clamping device, suppressing all overvoltages above its breakdown voltage. It automatically resets when the overvoltage goes away, but absorbs much more of the transient energy internally than a similarly rated crowbar device. A transient-voltage-suppression diode may be either unidirectional or bidirectional. A unidirectional device operates as a rectifier in the forward direction like any other avalanche diode, but is made and tested to handle very large peak currents. A bidirectional transient-voltage-suppression diode can be represented by two mutually opposing avalanche diodes in series with one another and connected in parallel with the circuit to be p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thyristor
A thyristor (, from a combination of Greek language ''θύρα'', meaning "door" or "valve", and ''transistor'' ) is a solid-state semiconductor device which can be thought of as being a highly robust and switchable diode, allowing the passage of current in one direction but not the other, often under control of a gate electrode, that is used in high power applications like inverters and radar generators. It usually consists of four layers of alternating P- and N-type materials. It acts as a bistable switch (or a latch). There are two designs, differing in what triggers the conducting state. In a three-lead thyristor, a small current on its gate lead controls the larger current of the anode-to-cathode path. In a two-lead thyristor, conduction begins when the potential difference between the anode and cathode themselves is sufficiently large (breakdown voltage). The thyristor continues conducting until the voltage across the device is reverse-biased or the voltage is removed (b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overvoltage
In electrical engineering, overvoltage is the raising of voltage beyond the design limit of a circuit or circuit element. The conditions may be hazardous. Depending on its duration, the overvoltage event can be transient—a voltage spike—or permanent, leading to a power surge. Explanation Electronic and electrical devices are designed to operate at a certain maximum supply voltage, and considerable damage can be caused by voltage that is higher than that for which the devices are rated. For example, an electric light bulb has a wire in it that at the given rated voltage will carry a current just large enough for the wire to get very hot (giving off light and heat), but not hot enough for it to melt. The amount of current in a circuit depends on the voltage supplied: if the voltage is too high, then the wire may melt and the light bulb burn out. Similarly other electrical devices may stop working, or may even burst into flames if an overvoltage is delivered to the circ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SIDAC
The DIAC (diode for alternating current) is a diode that conducts electrical current only after its breakover voltage, VBO, has been reached momentarily. Three, four, and five layer structures may be used. Behavior is similar to the voltage breakdown of a TRIAC without a gate terminal. When breakdown occurs, internal positive feedback (impact ionization or two transistor feedback) ensures that the diode enters a region of negative dynamic resistance, leading to a sharp increase in current through the diode and a decrease in the voltage drop across it (typically full switch-on takes a few hundred nanoseconds to microseconds). The diode remains in conduction until the current through it drops below a value characteristic for the device, called the ''holding current'', IH. Below this threshold, the diode switches back to its high-resistance, non-conducting state. This behavior is bi-directional, meaning typically the same for both directions of current. Most DIACs have a three- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crowbar (circuit)
A crowbar circuit is an electrical circuit used for preventing an overvoltage or surge condition of an AC power supply unit from damaging the circuits attached to the power supply. It operates by putting a short circuit or low resistance path across the voltage output (Vo), like dropping a Crowbar (tool), crowbar across the output terminals of the power supply. Crowbar circuits are frequently implemented using a thyristor, TRIAC, trisil or thyratron as the shorting device. Once triggered, they depend on the current (electricity), current-limiting circuitry of the power supply or, if that fails, the blowing of the line fuse (electrical), fuse or tripping the circuit breaker. The name is derived from having the same effect as throwing a crowbar over exposed power supply terminals to short the output. Example In the following example crowbar circuit, the LM431 adjustable Zener_diode, zener regulator controls the gate of the TRIAC. The Voltage_divider, resistor divider of R1 and R2 p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TRIAC
A TRIAC (triode for alternating current; also bidirectional triode thyristor or bilateral triode thyristor) is a three-terminal electronic component that conducts current in either direction when triggered. The term TRIAC is a genericized trademark. TRIACs are a subset of thyristors (analogous to a relay in that a small voltage and current can control a much larger voltage and current) and are related to silicon controlled rectifiers (SCRs). TRIACs differ from SCRs in that they allow current flow in both directions, whereas an SCR can only conduct current in a single direction. Most TRIACs can be triggered by applying either a positive or negative voltage to the gate (an SCR requires a positive voltage). Once triggered, SCRs and TRIACs continue to conduct, even if the gate current ceases, until the main current drops below a certain level called the holding current. Gate turn-off thyristors (GTOs) are similar to TRIACs but provide more control by turning off when the gate s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomson SA
Vantiva SA (formerly Technicolor SA, Thomson SARL, Thomson SA, and Thomson Multimedia) is a French multinational corporation that provides technology products and services for the communication, media and entertainment industries. Headquartered in Paris, Vantiva also maintains offices in Rennes (France), Beijing (China), Seoul (South Korea), Chennai (India), Edegem (a suburb of Antwerp, Belgium), Norcross (U.S), and Manaus (Brazil). The company was originally known as Thomas Multimedia and rebranded as Technicolor SA on January 27, 2010, adopting the name of its U.S. film technology subsidiary. In September 2022, Technicolor Creative Studios was spun off as a separate entity (now known as Technicolor Group), and the remaining company rebranded as Vantiva. Vantiva is organized into three divisions: * Connected Home: Manufactures broadband modems and Android TV set-top boxes * HomeSight: Offers remote care and monitoring services in clients’ homes. * Smart Spaces: Provid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ST Microelectronics
STMicroelectronics NV (commonly referred to as ST or STMicro) is a European multinational semiconductor contract manufacturing and design company. It is the largest of such companies in Europe. It was founded in 1987 from the merger of two state-owned semiconductor corporations: ''Thomson Semiconducteurs'' of United States/France and ''SGS Microelettronica'' of Italy. The company is incorporated in the Netherlands and headquartered in Plan-les-Ouates, Switzerland. Its shares are traded on Euronext Paris, the Borsa Italiana and the New York Stock Exchange. History ST was formed in 1987 by the merger of two government-owned semiconductor companies: Italian SGS Microelettronica (where SGS stands for ''Società Generale Semiconduttori'', "General Semiconductor Company"), and French ''Thomson Semiconducteurs'', the semiconductor arm of Thomson. SGS Microelettronica originated in 1972 from a previous merger of two companies: * ATES (Aquila Tubi e Semiconduttori), a vacuum tube ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Littelfuse
Littelfuse, Inc. is an American electronics manufacturing company headquartered in Chicago, Illinois. The company primarily produces circuit protection products (fuses) but also manufactures a variety of switches, automotive sensors and, through its subsidiary Zilog, microprocessors. Littelfuse was founded in 1927. In addition to its Chicago, Illinois, world headquarters, Littelfuse has more than 40 sales, distribution, manufacturing and engineering facilities in the Americas, Europe and Asia. Littelfuse is the developer of AutoFuse, the first blade-type automotive fuse. History Early history Edward V. Sundt founded Littelfuse in 1927 in Chicago Illinois as Littelfuse Laboratories. Prior to founding Littelfuse, Sundt had worked for General Electric and Stewart-Warner, where he found diagnostic equipment frequently experienced electrical failure. Sundt developed Littelfuse's first product, a small protective fuse, to regulate current in diagnostic equipment and prevent electrical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zener Diode
A Zener diode is a type of diode designed to exploit the Zener effect to affect electric current to flow against the normal direction from anode to cathode, when the voltage across its terminals exceeds a certain characteristic threshold, the ''Zener voltage''. Zener diodes are manufactured with a variety of Zener voltages, including variable devices. Some types have an abrupt, heavily doped p–n junction with a low Zener voltage, in which case the reverse conduction occurs due to electron quantum tunnelling in the short distance between p and n regions. Diodes with a higher Zener voltage have more lightly doped junctions, causing their mode of operation to involve avalanche breakdown. Both breakdown types are present in Zener diodes with the Zener effect predominating at lower voltages and avalanche breakdown at higher voltages. Zener diodes are used to generate low-power stabilized supply rails from higher voltages and to provide reference voltages for circuits, especially sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solid State Switches
Solid is a state of matter where molecules are closely packed and can not slide past each other. Solids resist compression, expansion, or external forces that would alter its shape, with the degree to which they are resisted dependent upon the specific material under consideration. Solids also always possess the least amount of kinetic energy per atom/molecule relative to other phases or, equivalently stated, solids are formed when matter in the liquid / gas phase is cooled below a certain temperature. This temperature is called the melting point of that substance and is an intrinsic property, i.e. independent of how much of the matter there is. All matter in solids can be arranged on a microscopic scale under certain conditions. Solids are characterized by structural rigidity and resistance to applied external forces and pressure. Unlike liquids, solids do not flow to take on the shape of their container, nor do they expand to fill the entire available volume like a gas. Muc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
