VARTA electrical components German VARTA models VARTA prices

VARTA 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.

VARTA electrical components classification

The classification of inductor coils commonly used in circuits is roughly as follows: Classification by inductance form: fixed inductors, variable inductors. Classification by magnetic core material: air-core coils, ferrite coils, iron-core coils, copper-core coils. Classification by operating nature: antenna coils, oscillator coils, choke coils, trap coils, deflection coils. Classification by winding structure: single-layer coils, multi-layer coils, honeycomb coils, close-wound coils, spaced-wound coils, self-supporting coils, honeycomb coils, random-wound coils.

VARTA electrical components applications

Light-emitting diodes are widely used in many fields. The following outlines their main applications: (1) Applications in electronic products: In electronic products, light-emitting diodes are generally used as backlight sources for screens or for display and lighting applications. From large LCD TVs and computer monitors to media players MP3, MP4, and mobile phones, light-emitting diodes are used as screen backlights. (2) Applications in automobiles and heavy machinery: Light-emitting diodes are widely used in automobiles and heavy machinery. Turn signals, interior lighting, instrument panel lighting, headlights, indicator lights, brake lights, tail lights, and other components in automobiles and heavy mechanical equipment utilize light-emitting diodes. This is mainly because light-emitting diodes offer fast response times and long service life (the lifespan of light-emitting diodes is generally longer than that of automobiles and heavy machinery). (3) Applications in coal mines: Due to characteristics such as high efficiency, low energy consumption, long lifespan, and high luminous intensity compared to ordinary light-emitting devices, light-emitting diodes are used in miners' lamps and underground lighting equipment. Although not yet fully popularized, they will soon see widespread adoption, and light-emitting diodes will replace ordinary light-emitting devices in coal mine applications. (5) Urban decorative lighting: In today's bustling commercial era, neon lights are an important symbol of urban prosperity, but they have many drawbacks, such as insufficient lifespan. Therefore, replacing neon lights with light-emitting diodes offers many advantages. Compared to neon lights, light-emitting diodes not only have a longer lifespan but also feature energy savings, simple drive and control, and maintenance-free operation. The replacement of neon lights by light-emitting diodes is an inevitable trend in the development of lighting equipment.

VARTA electrical components principle

Like ordinary diodes, light-emitting diodes are composed of a PN junction and also possess unidirectional conductivity. When a forward voltage is applied to a light-emitting diode, holes injected from the P region into the N region and electrons injected from the N region into the P region recombine with electrons in the N region and holes in the P region, respectively, within a few micrometers near the PN junction, producing spontaneous radiation fluorescence. The energy states of electrons and holes differ in different semiconductor materials. The amount of energy released when electrons and holes recombine varies; the more energy released, the shorter the wavelength of the emitted light. Commonly used are diodes emitting red, green, or yellow light. The reverse breakdown voltage of a light-emitting diode is greater than 9 volts. Its forward volt-ampere characteristic curve is very steep, so a current-limiting resistor must be connected in series during use to control the current through the diode. The core part of a light-emitting diode is a chip composed of P-type semiconductor and N-type semiconductor. Between the P-type semiconductor and the N-type semiconductor there is a transition layer called the PN junction. In the PN junction of certain semiconductor materials, when injected minority carriers recombine with majority carriers, excess energy is released in the form of light, thereby directly converting electrical energy into light energy. When a reverse voltage is applied to the PN junction, minority carriers are difficult to inject, so no light is emitted. When it is in forward operating state (i.e., forward voltage is applied across its terminals), current flows from the LED anode to the cathode, and the semiconductor crystal emits light of different colors from ultraviolet to infrared; the light intensity is related to the current.

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