FORMAT electrical components, German FORMAT models, FORMAT prices

FORMAT electrical components are products whose raw material molecular composition remains unchanged during factory processing; these are referred to as passive components. Passive components do not require an external power source. They include resistors, capacitors, and inductors. Circuit-type components include diodes and resistors; connection-type components include connectors, sockets, connecting cables, and printed circuit boards (PCB). Devices are products whose raw material molecular structure is altered during factory production and processing. Devices are classified into active devices and discrete devices. The main characteristic of active devices is that they generate or consume electrical energy and require an external power supply. Discrete devices are divided into bipolar junction transistors, field-effect transistors, thyristors, semiconductor resistors, and capacitors. shi

FORMAT electrical component features

LED lamps are light-emitting diodes (LEDs) that use solid-state semiconductor chips as the light-emitting material. Compared with traditional lamps, LED lamps are energy-efficient, environmentally friendly, and offer good color rendering and response speed. (1) Energy efficiency: The most prominent feature of LED lamps is their low energy consumption. The energy consumption of an LED lamp is one-tenth that of an incandescent lamp and one-quarter that of a compact fluorescent lamp. This is a major advantage of LED lamps. As people increasingly prioritize energy conservation and environmental protection, this energy-saving characteristic has led to widespread adoption and popularity of LED lamps. (2) High-speed switching capability: LED lamps can operate in high-speed switching states. When walking on the street, one can observe that screens or displays composed of LED elements change rapidly. This demonstrates that LED lamps can perform high-speed switching. In contrast, conventional incandescent lamps cannot operate in this manner. Frequent switching of incandescent lamps directly causes filament breakage. This is another important reason for the popularity of LED lamps. (3) Environmental friendliness: LED lamps do not contain mercury or other heavy metals, whereas fluorescent lamps do. This highlights the environmental advantage of LED lamps. Given the growing emphasis on environmental protection, more users prefer eco-friendly LED lamps. (4) Fast response time: Another notable feature of LED lamps is their rapid response. Upon power application, LED lamps illuminate immediately. Compared with conventional energy-saving lamps, which require considerable time to warm up and reach full brightness, LED lamps respond much faster. (5) Cleanliness: Compared with other light sources, LED lamps are "cleaner." This does not refer to surface or internal cleanliness, but rather to the fact that LED lamps are cold light sources. They generate minimal heat and do not attract insects that are drawn to light and heat. Especially in summer, rural areas have many insects. Some insects are naturally attracted to heat; incandescent and energy-saving lamps generate heat during operation, which attracts insects. This leads to pollutant accumulation on the lamp surface and indoor contamination from insect excrement. However, as cold light sources, LED lamps do not attract insects, thereby preventing such contamination. Thus, LED lamps are cleaner. Semiconductor light-emitting diodes have wide applications, low power consumption, long service life, and are low-carbon and environmentally friendly. In China, semiconductor LEDs are widely used; many residential lighting fixtures and most streetlights employ semiconductor LEDs. Some road lighting systems integrate solar technology to save substantial electrical energy. Photodiodes are classified by material into gallium aluminum arsenide photodiodes, aluminum gallium phosphide photodiodes, gallium phosphide photodiodes, and aluminum arsenide photodiodes.

FORMAT electrical component applications

The most basic application of a conventional thyristor is controlled rectification. The familiar diode rectifier circuit belongs to the category of uncontrolled rectifier circuits. If the diodes are replaced with thyristors, a controlled rectifier circuit can be formed. Taking the simplest single-phase half-wave controlled rectifier circuit as an example, during the positive half-cycle of the sinusoidal AC voltage U2, if no trigger pulse Ug is input to the gate of VS, VS still cannot conduct, only when U2 is in the positive half-cycle, and an external trigger pulse Ug is applied to the gate, the thyristor is triggered into conduction. Plot its waveforms (c) and (d), only when the trigger pulse Ug arrives, is there voltage UL output across the load RL. If Ug arrives earlier, the thyristor conducts earlier; if Ug arrives later, the thyristor conducts later. By changing the arrival time of the trigger pulse Ug at the gate, the average value of the output voltage UL across the load can be adjusted. In electrical engineering technology, half a cycle of AC power is often defined as 180°, called the electrical angle. Thus, During each positive half-cycle of U2, the electrical angle elapsed from the zero value to the instant the trigger pulse arrives is called the control angle α; the electrical angle during which the thyristor conducts within each positive half-cycle is called the conduction angle θ. Clearly, both α and θ are used to indicate the conduction or blocking range of the thyristor during the half-cycle when it is subjected to forward voltage. By changing the control angle α or the conduction angle θ, the average value of the pulsed DC voltage across the load is changed UL, achieving controlled rectification. Low-power plastic-packaged bidirectional thyristors are commonly used in sound- and light-controlled lighting systems. The rated current is less than 3A. Medium- and high-power plastic-packaged and metal-can packaged thyristors are commonly used in power-type controllable voltage regulation circuits, such as adjustable-output DC power supplies. High-power, high-frequency thyristors are commonly used in industrial applications, such as high-frequency melting furnaces.

FORMAT electrical component parameters

(1) Nominal capacitance: the capacitance value marked on the capacitor. However, the actual capacitance deviates from the nominal value; tolerance classes correspond to permissible errors. General capacitors commonly use classes I, II, and III, while electrolytic capacitors use classes IV, V, and VI to indicate capacitance precision, selected according to application. The capacitance of an electrolytic capacitor depends on the impedance presented under AC operating conditions; the value varies with operating frequency, temperature, voltage, and measurement method. The unit of capacitance is the F (farad). As a capacitor is a "container" for storing electric charge, its "capacity" must be defined. To quantify a capacitor's charge-storage capability, the physical quantity capacitance is established. A capacitor stores charge only under an applied voltage. Different capacitors may store different amounts of charge under the same voltage. Internationally, it is standardized that the charge stored by a capacitor when 1 volt DC is applied defines its capacitance (i.e., charge per unit voltage), denoted by the letter C. The base unit of capacitance is the farad (F). (2) Rated voltage: the maximum DC voltage that can be continuously applied to the capacitor at the minimum and rated ambient temperatures. If the operating voltage exceeds the capacitor's voltage rating, the capacitor will break down and be damaged. In practice, the voltage rating decreases as temperature rises. (3) Insulation resistance: When DC voltage is applied to a capacitor, a leakage current flows; the ratio of voltage to leakage current is the insulation resistance. For small capacitors, this value mainly depends on the surface condition; generally, higher insulation resistance is preferable. (4) Loss: The energy dissipated as heat per unit time in a capacitor under an electric field is called loss. Loss depends on frequency range, dielectric material, conductivity, and the resistance of the capacitor's metallic parts. (12) Frequency characteristics: As frequency increases, the capacitance of general capacitors tends to decrease. Below the resonant frequency, the capacitor behaves capacitively; above the resonant frequency, it behaves inductively, effectively acting as an inductor rather than a capacitor. Therefore, operation above the resonant frequency must be avoided.

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