marx electrical components Germany marx model marx price

marx electrical components are fuses that can be operated multiple times, known in Japan as permanent fuses. Immediately after interrupting an overload or short-circuit current, the fusible element automatically restores to its original state. The housing is made of austenitic stainless steel, with a beryllium oxide ceramic core embedded in the center. The space between the stainless steel and the ceramic core is filled with glass to seal and secure the ceramic core. The fine pores in the ceramic core are filled with metallic sodium as the fusible element, and the void behind the piston is filled with argon gas to compress the metallic sodium. Under normal operating conditions, current can enter from lead terminal A, pass through the metallic sodium in the fine pores of the ceramic core, conduct to the stainless steel housing, and exit via output terminal B. When a short-circuit current passes through the fuse, it rapidly heats the metallic sodium in the fine pores of the ceramic core, causing it to change from a solid to a high-temperature, high-pressure plasma vapor. The resistivity increases rapidly, thereby strongly limiting the short-circuit current and interrupting it instantly. At the end of the interruption, the metallic sodium vapor immediately returns to liquid and solid states, while the argon gas pushes the piston again to compress the metallic sodium, re-establishing the circuit connection.

marx electrical component principle

1, Emitter injects electrons into the base region: Power supply Ub is applied across the emitter junction via resistor Rb. The emitter junction is forward-biased, causing the majority carriers (free electrons) in the emitter region to continuously cross the emitter junction into the base region, forming the emitter current Ie. Simultaneously, majority carriers in the base region diffuse toward the emitter, but since their concentration is much lower than that of the emitter carriers, this current can be neglected; thus, the emitter junction current is considered primarily an electron flow. 2, Diffusion and recombination of electrons in the base region: After entering the base region, electrons initially accumulate near the emitter junction, gradually forming an electron concentration gradient. Driven by this gradient, the electron flow diffuses through the base region toward the collector junction and is pulled into the collector region by the collector junction's electric field, forming the collector current Ic. A very small portion of electrons (due to the thin base region) recombine with holes in the base. The ratio of the diffused electron flow to the recombined electron flow determines the transistor's amplification capability. 6, Collector collects electrons: Due to the large reverse voltage applied externally to the collector junction, the electric field force generated by this reverse voltage prevents electrons in the collector region from diffusing into the base region and simultaneously pulls electrons diffusing near the collector junction into the collector region, thereby forming the main collector current Icn. Additionally, minority carriers (holes) in the collector region undergo drift motion, flowing into the base region to form the reverse saturation current, denoted by Icbo. Its value is very small but exceptionally sensitive to temperature.

marx electrical component features

1, The function of a varactor diode is based on the principle of variable capacitance across the PN junction. It is a semiconductor device used as a variable capacitor in high-frequency tuning, communication, and other circuits. Varactor diodes are reverse-biased diodes; changing the reverse bias voltage across the PN junction changes the junction capacitance. The higher the reverse bias voltage, the lower the junction capacitance. The relationship between reverse bias voltage and junction capacitance is nonlinear. 6, Graphical representation of the relationship between varactor diode capacitance and reverse bias voltage: (a) Increasing reverse bias causes capacitance to decrease; (b) Decreasing reverse bias causes capacitance to increase. The capacitance tolerance range defines the specified capacitance range for a varactor diode. Datasheets typically display the minimum, nominal, and maximum values, which are often plotted on graphs.

marx electrical component applications

The most basic application of a standard thyristor is controlled rectification. The familiar diode rectifier circuit is an uncontrolled rectifier circuit. Replacing the diode with a thyristor creates a controlled rectifier circuit. 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 there is no input trigger pulse Ug at the gate of VS, VS will not conduct. The thyristor is triggered into conduction only when U2 is in the positive half-cycle and a trigger pulse Ug is applied to the gate. Plotting its waveforms (c) and (d), voltage UL appears across the load RL only when the trigger pulse Ug arrives. 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, half a cycle of AC power is often defined as 180°, referred to as the electrical angle. Thus, in each positive half-cycle of U2, the electrical angle elapsed from zero 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 represent the conduction or blocking range of the thyristor during the half-cycle where it withstands forward voltage. By changing the control angle α or the conduction angle θ, the average value of the pulsed DC voltage UL across the load is altered, achieving controlled rectification. Low-power plastic-packaged bidirectional thyristors are commonly used in sound-and-light-controlled lighting systems. Rated current is less than 4A. Medium and high-power plastic-packaged and metal-can thyristors are typically used in power-type controlled voltage regulation circuits, such as adjustable DC output power supplies. High-power, high-frequency thyristors are commonly used in industrial applications, such as high-frequency melting furnaces.

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