Elfin electrical components Germany Elfin models Elfin prices

Elfin electrical components are devices that convert alternating current into direct current, and can be used in power supply units and for detecting radio signals, among other applications. Rectifiers can be made from vacuum tubes, ignitrons, solid-state silicon semiconductor diodes, mercury arcs, etc. Conversely, a device that converts direct current into alternating current is called an "inverter". In standby UPS systems, only battery charging is required without supplying power to the load, so only a charger is present. In double-conversion UPS systems, this device supplies power to the inverter and charges the battery, hence it is referred to as a rectifier/charger. A rectifier is a rectification device; simply put, it is a device that converts AC to DC. It has two main functions: first, to convert AC to DC, which after filtering is supplied to the load or to the inverter; second, to provide charging voltage to the battery. Therefore, it also serves as a charger.

Elfin electrical component structure

For rubber and plastic power cables, copper cores are preferred for use in power, lighting, and internal installation of electrical equipment; for large cross-section conductors, compacted stranded cores are recommended. Conductors for fixed installations generally adopt Class 1 or Class 2 conductor structures. Insulation materials generally include four types: natural styrene-butadiene rubber, polyvinyl chloride (PVC), polyethylene, and nitrile-PVC compounds. Heat-resistant power cables use PVC rated for 90 °C. Sheath materials generally include five types: PVC, cold-resistant PVC, ant-termite PVC, black polyethylene, and neoprene rubber. Black polyethylene and neoprene sheathed power cables are suitable for extreme cold resistance and outdoor overhead laying. In environments with external forces, corrosion, or humidity, power cables with rubber or plastic sheaths can be used. Rubber and plastic flexible power cables use copper cores with a flexible structure, composed of multiple single wires twisted together; flexible conductors generally adopt Class 5 or Class 6 conductor structures. Insulation materials generally include natural styrene-butadiene rubber, PVC, or soft polyethylene plastic. The cabling lay ratio multiplier is small. The outer protective layer uses cotton yarn braiding to prevent overheating and damage to the insulation layer. To facilitate use and simplify production processes, a three-core balanced structure is adopted, which saves production labor hours and improves production efficiency. For shielded insulated power cables, tinning of the conductor cores is permitted in certain occasions; the surface coverage density of the shielding layer must comply with standards or meet user requirements; the shielding layer should be braided or wrapped with tinned copper wire; if an extruded sheath is added over the shield, the shield may use soft round copper wire braiding or wrapping. To prevent internal interference between cores or pairs, individual phase shielding structures for each core (or pair) can be produced. General-purpose rubber-sheathed rubber power cables use copper flexible wire bundles with a flexible structure; paper wrapping is allowed on the surface of large cross-sections to improve bending performance. Insulation uses natural styrene-butadiene rubber, which has good aging resistance. The rubber for outdoor products uses neoprene or a neoprene-based mixed rubber formula. Mining rubber power cables use copper cores with a flexible structure, composed of multiple single wires twisted together: flexible conductors generally adopt Class 5 or Class 13 conductor structures. Insulation materials generally use rubber. The cabling lay ratio multiplier is small. Many products use metal braiding to uniform the electric field and improve the sensitivity display of insulation status. There is a thicker outer sheath, and color coding is applied underground in mines to help construction personnel understand the different voltage levels of the rubber power cables.

Elfin electrical component principle

Bipolar junction transistors are divided into two types by material: germanium and silicon. Each type has two structural forms: NPN and PNP. However, the most commonly used are silicon NPN and germanium PNP transistors. (Here, N means negative; N-type semiconductors are formed by adding phosphorus to high-purity silicon to replace some silicon atoms, generating free electrons for conduction under voltage stimulation. P means positive, where boron is added to replace silicon, creating numerous holes to facilitate conduction). Apart from different power supply polarities, their working principles are identical. Below, only the current amplification principle of NPN silicon transistors is introduced. An NPN transistor consists of 5 pieces of N-type semiconductor sandwiching one piece of P-type semiconductor. The PN junction formed between the emitter region and the base region is called the emitter junction, while the PN junction formed between the collector region and the base region is called the collector junction. The three leads are respectively called the emitter e, base b, and collector c. When the potential at point b is a few tenths of a volt higher than at point e, the emitter junction is forward-biased. When the potential at point C is several volts higher than at point b, the collector junction is reverse-biased, and the collector power supply Ec must be higher than the base power supply Eb. During transistor manufacturing, the majority carrier concentration in the emitter region is intentionally made greater than that in the base region. Additionally, the base region is made very thin, and impurity content is strictly controlled. Thus, once power is connected, due to the forward bias of the emitter junction, the majority carriers in the emitter region (electrons) and the majority carriers in the base region (holes) easily diffuse across the emitter junction toward each other. However, since the former's concentration is much higher than the latter's, the current passing through the emitter junction is basically an electron flow, known as the emitter electron current.

Elfin electrical component classification

Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, and more. They are all composed of single or multi-strand conductors and insulation layers, used to connect circuits, electrical appliances, etc. Cables can be divided into DC cables and AC cables according to the photovoltaic power station system, and are classified into DC cables and AC cables based on usage and operating environment.

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