STIEBELELTRON electrical components Germany STIEBELELTRON model STIEBELELTRON price

STIEBELELTRON electrical components are one of the earliest types of electrical signal amplification devices. The cathode electron emission part, control grid, accelerating grid, and anode (plate) leads, enclosed in a glass container (usually a glass tube), are soldered 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. Early applications included electronic products such as televisions, radios, and amplifiers. Later, 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 coefficients are still used as audio power amplification devices (in Hong Kong, vacuum tube power amplifiers are referred to as "tube amps").

STIEBELELTRON electrical component functions

Control high power, capable of controlling hundreds of kilowatts. Using power transistors as switches has many advantages, primarily ease of turn-off and fewer required auxiliary components. Fast switching allows operation at high frequencies. Transistor compounding (Darlington) and parallel connection are effective methods to increase transistor switching capability. In such high-power circuits, the main problem is wiring. High switching speeds can generate significant interference voltages even on short connection lines. Simple and optimized base drive results in high performance. The base drive circuit not only drives the power transistor but also protects it, known as "non-centralized protection" (as opposed to centralized protection). Functions of integrated drive circuits include: turning the power switch on and off, monitoring auxiliary supply voltage, limiting maximum and minimum pulse widths, thermal protection, and monitoring the switch's saturation voltage drop.

STIEBELELTRON electrical component structure

The structure and materials of new high-voltage Schottky diodes differ from traditional Schottky diodes. Traditional Schottky diodes are formed by metal-semiconductor contact. Metals such as aluminum, gold, molybdenum, nickel, and titanium can be used, while the semiconductor is typically silicon or gallium arsenide. Since electrons have higher mobility than holes, N-type semiconductor material is selected as the substrate to achieve good frequency characteristics. To reduce the junction capacitance of the Schottky diode and increase the reverse breakdown voltage without causing excessive series resistance, a high-resistance N- thin layer is usually epitaxially grown on an N+ substrate. As is well known, metal conductors contain a large number of conduction electrons. When metal contacts a semiconductor (with a distance on the order of atomic size), the Fermi level of the metal is lower than that of the semiconductor. At the sub-levels corresponding to the conduction band inside the metal, the electron density is lower than that in the semiconductor conduction band. Therefore, after contact, electrons diffuse from the semiconductor to the metal, causing the metal to become negatively charged and the semiconductor positively charged. Since metal is an ideal conductor, negative charge is distributed only within a thin layer on the surface with atomic-scale thickness. For N-type semiconductors, donor impurity atoms that lose electrons become positive ions and are distributed over a larger thickness. The result of electron diffusion from the semiconductor to the metal forms a space charge region, a built-in electric field, and a potential barrier, with the depletion layer located only on the N-type semiconductor side (the entire barrier region falls on the semiconductor side). The direction of the built-in electric field in the barrier region points from the N-type region to the metal. As thermionic emission increases the built-in field, the drift current opposite to the diffusion current increases, eventually reaching dynamic equilibrium and forming a contact potential barrier between the metal and the semiconductor, known as the Schottky barrier. When the external voltage is zero, the electron diffusion current equals the reverse drift current, achieving dynamic equilibrium. When forward bias is applied (positive voltage to the metal, negative voltage to the semiconductor), the built-in field weakens, the barrier on the semiconductor side lowers, and a forward current flows from the metal to the semiconductor. When reverse bias is applied, the built-in field strengthens, the barrier height increases, and a small reverse current flows from the semiconductor to the metal. Therefore, SBD, like PN junction diodes, is a nonlinear device with unidirectional conductivity.

STIEBELELTRON electrical component characteristics

Under normal circumstances, the actual static characteristic output of a sensor is a curve rather than a straight line. In practical work, to enable instruments to have uniformly scaled readings, a fitted straight line is often used to approximately represent the actual characteristic curve. Linearity (non-linear error) is a performance indicator of this approximation. There are various methods for selecting the fitted straight line. For example, the theoretical straight line connecting the zero input and full-scale output points can be used as the fitted line; or the theoretical line that minimizes the sum of squared deviations from each point on the characteristic curve can be used, known as the least squares fitted line.

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