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performance in light electrical components are Schottky barrier diodes named after their inventor, Dr. Schottky. Schottky barrier diodes are not made using the principle of forming a PN junction by contact between P-type semiconductor and N-type semiconductor, but rather using the principle of a metal-semiconductor junction formed by contact between metal and semiconductor. Therefore, Schottky barrier diodes are also called metal-semiconductor (contact) diodes or surface barrier diodes; they are a type of hot-carrier diode.

performance in light electrical component classification

Thyristors have multiple classification methods: (1) Classification by turn-off, turn-on, and control methods: Thyristors can be divided into conventional thyristors, bidirectional thyristors, reverse-conducting thyristors, gate turn-off thyristors, BTG thyristors, temperature-controlled thyristors, and light-controlled thyristors, among others. (2) Classification by pins and polarity: Thyristors can be divided into two-pin thyristors, three-pin thyristors, and four-pin thyristors based on their pins and polarity. (3) Classification by package form: Thyristors can be divided into three types based on their package form: metal-packaged thyristors, plastic-packaged thyristors, and ceramic-packaged thyristors. Among these, metal-packaged thyristors are further divided into bolt-type, flat-type, round-case type, and others; plastic-packaged thyristors are divided into two types: with heat sink and without heat sink. (4) Classification by current capacity: Thyristors can be divided into three types based on current capacity: high-power thyristors, medium-power thyristors, and low-power thyristors. Typically, high-power thyristors mostly use metal case packaging, while medium- and low-power thyristors mostly use plastic or ceramic packaging. (5) Classification by turn-off speed: Thyristors can be divided into conventional thyristors and high-frequency (fast) thyristors based on their turn-off speed. (6) Zero-crossing triggering - generally for power regulation, i.e., triggering when the phase of the sinusoidal AC voltage crosses zero; triggering must occur at the zero-crossing point to conduct the thyristor. (7) Non-zero-crossing triggering - the thyristor can be triggered to conduct regardless of the phase of the AC voltage; common is phase-shift triggering, i.e., changing the output percentage by changing the conduction angle (phase angle) of the sinusoidal AC voltage.

performance in light electrical component performance

The performance of fiber optic connectors includes optical performance, as well as considerations for interchangeability, repeatability, tensile strength, temperature, and mating cycles. 1. Optical performance: The main requirements for the optical performance of fiber optic connectors are insertion loss and return loss, which are the two most basic parameters. Insertion loss, also known as connection loss, refers to the loss of effective optical power in the link caused by the introduction of the connector. The lower the insertion loss, the better; it is generally required to be no greater than 0.5dB. Return loss refers to the connector's ability to suppress the reflection of optical power in the link; its typical value should be no less than 25dB. For connectors in practical applications, the ferrule surface undergoes specialized polishing treatment, which can increase the return loss, generally to no less than 45dB. 2. Interchangeability and repeatability: Fiber optic connectors are universal passive devices. For the same type of fiber optic connector, they can generally be combined arbitrarily and reused multiple times, with the additional loss introduced thereby generally being less than 0.2dB. (3) Tensile strength: For assembled fiber optic connectors, the tensile strength is generally required to be no less than 90N. (4) Temperature: General requirements state that fiber optic connectors must operate normally within a temperature range of -40oC to +70oC. (5) Mating cycles: Most fiber optic connectors used can withstand more than l009 mating cycles.

performance in light electrical component classification

Fuses can be divided into high-voltage fuses and low-voltage fuses based on operating voltage. Based on the protected object, they can be divided into fuses for protecting transformers and general electrical equipment, fuses for protecting voltage transformers, fuses for protecting power capacitors, fuses for protecting semiconductor components, fuses for protecting motors, and fuses for protecting household appliances, among others. Based on structure, they can be divided into open-type, semi-enclosed, cartridge, and expulsion fuses. Open-type fuses have a simple structure, with the fusible element completely exposed to the air and supported by porcelain pillars without a base, suitable for low-voltage outdoor use. They produce significant noise and light in the atmosphere when interrupting current. Semi-enclosed fuses have the fusible element mounted on a porcelain frame, inserted into a porcelain box with metal sockets at both ends, suitable for low-voltage indoor use. The noise and light produced during current interruption are contained by the porcelain box. In cartridge fuses, the fusible element is installed inside the fuse body. It is then inserted into a base or directly connected into the circuit for use. The fuse element is a fully sealed insulating tube with metal caps or contact blades at both ends. If the insulating tube of this type of fuse is filled with quartz sand, it has a current-limiting effect when interrupting current, greatly improving the breaking capacity, hence it is also called a high-breaking-capacity fuse. If the tube is evacuated, it is called a vacuum fuse. If the tube is filled with SF6 gas, it is called an SF6 fuse, aimed at improving arc-extinguishing performance. Since quartz sand, vacuum, and SF6 gas all have good insulation properties, this type of fuse is suitable for both low-voltage and high-voltage applications. Expulsion fuses have the fusible element installed in an insulating tube made of solid gas-generating material. The solid gas-generating material can be electrical anti-white cardboard or organic glass material, among others. When short-circuit current passes through the fusible element, it melts immediately, producing an electric arc. The high-temperature arc causes the solid gas-generating material to rapidly decompose, producing a large amount of high-pressure gas, which expels the ionized gas and electric arc from both ends of the tube, emitting intense noise and light, and extinguishing the arc when the AC current crosses zero, thereby interrupting the current. The insulating tube is usually mounted on an insulating support to form the complete fuse assembly. Sometimes the upper end of the insulating tube is designed to be movable, detaching and dropping immediately after current interruption; this type of expulsion fuse is commonly known as a drop-out fuse.

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