STROMPROPAGACE electrical components Germany STROMPROPAGACE model STROMPROPAGACE price

STROMPROPAGACE electrical component is a high-power electrical component, also known as a thyristor. It has the advantages of small size, high efficiency, and long service life. In automatic control systems, it can serve as a high-power drive device, enabling low-power control elements to control high-power equipment. It is widely used in AC/DC motor speed control systems, power regulation systems, and servo systems. Thyristors are divided into unidirectional thyristors and bidirectional thyristors. Bidirectional thyristors are also called triac bidirectional thyristors, abbreviated as TRIAC. A bidirectional thyristor is structurally equivalent to two unidirectional thyristors connected in reverse; this type of thyristor has bidirectional conduction capability. Its on/off state is determined by the gate G. Applying a positive pulse (or negative pulse) to the gate G can cause it to conduct in the forward (or reverse) direction. The advantages of this device are a simple control circuit and no reverse voltage withstand issue, making it particularly suitable for use as an AC contactless switch.

STROMPROPAGACE electrical component classification

1, fuse resistor: also called a fusible resistor, it serves the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes its power to exceed the rated power, it fuses like a fuse to disconnect the connected circuit. Fuse resistors generally have small resistance values and low power ratings. 8, sensitive resistor: refers to a resistor whose resistance value is sensitive to certain physical quantities (such as temperature, humidity, light, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance value of the sensitive resistor changes accordingly, presenting different resistance values. Based on sensitivity to different physical quantities, sensitive resistors can be classified into thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magnetoresistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductor materials, so these resistors are also called semiconductor resistors. The resistance value of a thermistor changes with temperature; a thermistor whose resistance decreases as temperature rises is a negative temperature coefficient (NTC) thermistor. NTC thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. A photoresistor's resistance value changes with the intensity of incident light; when incident light increases, the photoresistor's resistance decreases, and when incident light weakens, the resistance value increases.

STROMPROPAGACE electrical component applications

Metal waveguides and metal resonant cavities are widely used in the decimeter, centimeter, and longer millimeter wave bands. Since the cross-section of the waveguide and the dimensions of the resonant cavity are close to the wavelength, the small size of metal waveguides and resonant cavities makes them difficult to manufacture. It is even more impossible to apply metal waveguides or resonant cavities in the infrared or visible light bands, where wavelengths are on the micrometer scale. For this reason, dielectric waveguides and dielectric resonators have rapidly developed and gained widespread application. Although the dimensions of dielectric waveguides and dielectric resonators are also on a scale comparable to the wavelength, they are easy to fabricate into tiny sizes using microfabrication techniques. For example, optical fibers and optical waveguides with cross-sectional dimensions on the micrometer scale belong to dielectric waveguides. The field in a metal waveguide can be viewed as resulting from plane waves reflecting back and forth between conductor surfaces; similarly, the field in a dielectric waveguide can be viewed as resulting from total reflection of electromagnetic waves at dielectric interfaces. Therefore, a dense medium surrounded by a sparse medium forms a dielectric waveguide. In an ideal metal waveguide, the electromagnetic field forms a standing wave transversely, and outside the waveguide boundary, it approximates an ideal conductor with no electromagnetic field. In a dielectric waveguide, the electromagnetic field forms a standing wave transversely, but an electromagnetic field still exists outside the dielectric waveguide; it decays transversely and is called an evanescent field. In a metal waveguide filled with a homogeneous medium, the TE mode and TM mode can individually satisfy the short-circuit boundary conditions of the waveguide walls, so the TE mode and TM mode can always be separated, and both can propagate in the metal waveguide. When a metal waveguide is filled with two or more media, or partially filled with a dielectric, the electromagnetic field must satisfy not only the boundary conditions on the conductor walls but also the continuity conditions at the media interfaces. In the case of uniform filling with two or more media, only hybrid modes of TE and TM, known as HEM modes, can exist. After understanding the above content, one can further explore dielectric resonators. As early as 1939, the concept and theory of dielectric resonators were proposed, but due to the lack of suitable dielectric materials, this theory remained dormant for over 20 years without practical development. It was not until the 20th century, 60s, that the successful development of high-permittivity ceramics such as rutile ceramic (ε≈80100) brought dielectric resonators back into attention. However, the high temperature coefficient of rutile ceramic limited its practical application. In the 20th century, 70s, barium titanate and zirconium titanate ceramics were developed; their high permittivity, low loss, and low temperature coefficient made dielectric resonators practical. Dielectric resonators have advantages such as small size, light weight, high quality factor, and good stability. They are particularly suitable for application in microstrip circuits, microwave integrated circuits, and the millimeter wave band, receiving significant attention and rapid development. When the permittivity is very high, the interface between the dielectric and air approximates an open circuit, and the reflection coefficient of electromagnetic waves at the interface approaches 1. In this case, the surface of the dielectric resonator can be regarded as an open-circuit wall, i.e., a magnetic wall. Thus, the dielectric resonator becomes a closed system with homogeneous boundary conditions, i.e., an equivalent open-circuit wall (magnetic wall) resonant cavity.

STROMPROPAGACE electrical component classification

1. Classification by relay outline dimensions: (1) miniature relay, (2) sub-miniature relay, (3) small miniature relay. 2. Classification by relay load: (1) micro-power relay, (2) low-power relay, (3) medium-power relay, (4) high-power relay. 14. Classification by relay protection characteristics: (1) sealed relay: a relay with contacts and coils sealed inside a cover by welding or other methods, isolated from the surrounding medium, featuring a low leakage rate. (2) enclosed relay: a relay with contacts and coils protected by a housing (non-sealed). (3) open relay: a relay without a protective cover for contacts and coils. Among the above relays, electromagnetic relays and reed relays are the most commonly used in electronic fabrication.

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