LUXART electrical components, German LUXART models, LUXART prices

LUXART electrical components are among the earliest devices for amplifying electrical signals. The cathode electron-emitting part, control grid, accelerating grid, and anode (plate) lead, enclosed in a glass container (typically a glass tube), are welded to the tube base. An electric field is used to inject electrons into the control grid in a vacuum to modulate the signal, and different parameter signal data after signal amplification or feedback oscillation are obtained at the anode. Initially applied in electronic products such as televisions, radios, and loudspeakers, they were gradually replaced by amplifiers and integrated circuits made from semiconductor materials, but in some high-fidelity audio equipment, vacuum tubes with low noise and high stability factors are still used as audio power amplification devices (in Hong Kong, vacuum tube power amplifiers are referred to as "tube amps").

LUXART electrical component classification

(1) Point-contact diodes have a small PN junction contact area, cannot pass large forward currents or withstand high reverse voltages, but offer good high-frequency performance, making them suitable for use in high-frequency detection circuits and switching circuits. (2) Surface-contact diodes have a large PN junction contact area, can pass larger currents, and can withstand higher reverse voltages, making them suitable for use in rectifier circuits. (3) Planar diodes have a small PN junction area when used as switching transistors in pulse digital circuits, and a larger PN junction area when used for high-power rectification. (4) Zener diodes are a special type of surface-contact silicon semiconductor diode that provides voltage stabilization. The main difference between zener diodes and ordinary diodes is that zener diodes operate in the reverse breakdown state of the PN junction. By implementing process measures during manufacturing and limiting the magnitude of the reverse current during use, it is ensured that the zener diode will not be damaged by overheating in the reverse breakdown state. Unlike general diodes, the reverse breakdown of a zener diode is reversible; as long as the current does not exceed the allowable value for the zener diode, the PN junction will not overheat and fail. When the external reverse voltage is removed, the zener diode restores its original performance, so zener diodes have good repetitive breakdown characteristics. (5) Photodiodes, also known as photosensitive diodes, have a glass window on their casing to facilitate light reception. Their characteristic is that when light irradiates the PN junction, free electrons and holes are generated in pairs, increasing the concentration of minority carriers in the semiconductor. Under a certain reverse bias voltage, this causes the reverse current to increase. Therefore, the reverse current increases linearly with increasing light intensity. When there is no light illumination, the volt-ampere characteristics of the photodiode are the same as those of an ordinary diode. As light-controlled components, photodiodes can be used for various object detection, photoelectric control, and automatic alarm applications. When manufactured as large-area photodiodes, they can serve as an energy source and are called solar cells. In this case, they do not require an external power supply and can directly convert light energy into electrical energy. (6) Light-emitting diodes are solid-state semiconductor display devices that directly convert electrical energy into light energy, abbreviated as LED. Similar to ordinary diodes, light-emitting diodes are also composed of a PN structure. The PN junction of a light-emitting diode is encapsulated in a transparent plastic shell, with shapes including square, rectangular, and circular. Light-emitting diodes have advantages such as low drive voltage, small operating current, strong resistance to vibration and shock, small size, high reliability, low power consumption, and long service life, and are widely used in signal indication circuits. In electronic technology, commonly used numeric displays operate on principles opposite to those of photodiodes. When a light-emitting diode is forward-biased and current passes through it, it emits light, which is the result of energy release when electrons and holes recombine directly. Its spectral range is relatively narrow, and its wavelength depends on the basic material used.

LUXART electrical component characteristics

The main characteristics of circuit breakers include: rated voltage; rated current; tripping current setting ranges for overload protection and short-circuit protection; rated short-circuit breaking capacity, etc. Rated ultimate short-circuit breaking capacity refers to the ability of a low-voltage circuit breaker to operate normally again and break this short-circuit current one more time after interrupting the maximum three-phase short-circuit current at the output terminal of the circuit breaker; the circuit breaker does not guarantee whether it can normally connect and disconnect thereafter. Rated service short-circuit breaking capacity refers to the ability of the circuit breaker to normally break multiple times when the maximum three-phase short-circuit current occurs at its output terminal. The rated service short-circuit breaking capacity is a breaking current value lower than the rated ultimate short-circuit breaking current. Generally speaking, circuit breakers with three-stage protection functions—long-time delay for overload, short-time delay for short-circuit, and instantaneous action for short-circuit—can achieve selective protection, and most main lines (including the output terminals of transformers) use them as main protection switches. Circuit breakers without short-circuit short-time delay functionality (having only two-stage protection: long-time delay for overload and instantaneous action for short-circuit) cannot provide selective protection and can only be used on branch circuits. "Marine Electrical Engineering" points out that for circuit breakers with three-stage protection, emphasis is placed on their service short-circuit breaking capacity value, while for circuit breakers used on branch lines, it must be ensured that they have sufficient ultimate short-circuit breaking capacity values. A common bias is to prefer larger ratings rather than appropriately sized ones, under the assumption that larger is safer. However, selecting excessively large ratings causes unnecessary waste. Therefore, there is no need for circuit breakers on branch lines to blindly pursue high service short-circuit breaking capacity indicators. For circuit breakers used on main lines, they must not only meet the requirements for rated ultimate short-circuit breaking capacity but also satisfy the requirements for rated service short-circuit breaking capacity. A circuit breaker is a basic low-voltage electrical appliance with overload, short-circuit, and undervoltage protection functions, capable of protecting lines and power sources. The main technical indicators are rated voltage and rated current. Circuit breakers have different functions depending on the application, with many varieties and specifications, and numerous specific technical indicators. Free tripping of circuit breakers: If the protection action connects the tripping circuit at any moment during the closing process of the circuit breaker, the circuit breaker can reliably disconnect completely; this is called free tripping. Circuit breakers with free tripping ensure that if a short-circuit fault occurs during closing, they can disconnect rapidly, avoiding the expansion of the accident scope.

LUXART electrical component principles

In chemical batteries, the direct conversion of chemical energy into electrical energy relies on spontaneous oxidation-reduction and other chemical reactions occurring inside the battery, with these reactions taking place at two electrodes respectively. The negative electrode active material consists of reducing agents with more negative potentials and stable in the electrolyte, such as active metals like zinc, cadmium, and lead, as well as hydrogen or hydrocarbon compounds. The positive electrode active material consists of oxidizing agents with more positive potentials and stable in the electrolyte, such as metal oxides like manganese dioxide, lead dioxide, and nickel oxide, oxygen or air, halogens and their salts, oxyacids and their salts, etc. The electrolyte is a material with good ionic conductivity, such as aqueous solutions of acids, bases, and salts, organic or inorganic non-aqueous solutions, molten salts, or solid electrolytes. When the external circuit is open, although there is a potential difference (open-circuit voltage) between the two poles, there is no current, and the chemical energy stored in the battery is not converted into electrical energy. When the external circuit is closed, current flows through the external circuit under the action of the potential difference between the two electrodes. Meanwhile, inside the battery, since there are no free electrons in the electrolyte, charge transfer must accompany oxidation or reduction reactions at the interface between the active materials of the two electrodes and the electrolyte, as well as mass transfer of reactants and reaction products. Charge transfer in the electrolyte is also accomplished by ion migration. Therefore, normal charge transfer and mass transfer processes inside the battery are necessary conditions for ensuring normal electrical energy output. During charging, the directions of charge transfer and mass transfer processes inside the battery are exactly opposite to those during discharge; electrode reactions must be reversible to ensure the normal progress of reverse mass transfer and charge transfer processes. Therefore, reversibility of electrode reactions is a necessary condition for constituting a storage battery. This is the basic thermodynamic relationship between battery electromotive force and battery reaction, and also the basic thermodynamic equation for calculating battery energy conversion efficiency. In practice, when current flows through the electrodes, the electrode potential deviates from the thermodynamically balanced electrode potential; this phenomenon is called polarization. The greater the current density (current passing through per unit electrode area), the more severe the polarization. Polarization is one of the important causes of battery energy loss. There are three causes of polarization: (1) Polarization caused by the resistance of various parts within the battery is called ohmic polarization; (2) Polarization caused by the hindrance of the charge transfer process in the electrode-electrolyte interface layer is called activation polarization; (3) Polarization caused by sluggish mass transfer processes in the electrode-electrolyte interface layer is called concentration polarization. Methods to reduce polarization include increasing the electrode reaction area, reducing current density, raising the reaction temperature, and improving the catalytic activity of the electrode surface.

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