ALLKABEL electrical components Germany ALLKABEL model ALLKABEL price

ALLKABEL electrical component is a sensor resistor whose resistance value changes with temperature. According to different temperature coefficients, it is divided into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance value of a positive temperature coefficient thermistor increases as the temperature rises, while the resistance value of a negative temperature coefficient thermistor decreases as the temperature rises; both belong to semiconductor devices.

ALLKABEL electrical component function

The main function of ferrite beads is to eliminate RF noise present in transmission line structures (circuits). RF energy is an AC sinusoidal component superimposed on the DC transmission level, where the DC component is the required useful signal. To eliminate this unwanted signal energy, chip ferrite beads are used to act as high-frequency resistors (attenuators). Ferrite beads have high resistivity and permeability, equivalent to a resistor and inductor in series, but both resistance and inductance values vary with frequency. They offer better high-frequency filtering characteristics than ordinary inductors, presenting resistive behavior at high frequencies, thus maintaining high impedance over a relatively wide frequency range to improve FM filtering effects. Inductors can be used for power supply filtering. The circuit symbol for a ferrite bead is that of an inductor, but the model number indicates the use of a ferrite bead. In terms of circuit function, ferrite beads and inductors operate on the same principle, differing only in frequency characteristics. The DC component is the required useful signal, whereas RF RF energy is useless electromagnetic interference transmitted and radiated along the line. To eliminate this unwanted signal energy, chip ferrite beads are used to act as high-frequency resistors (attenuators), allowing DC signals to pass while filtering out AC signals. Ferrite beads have high resistivity and permeability, equivalent to a resistor and inductor in series. In the circuit, the wire simply passes through it. High-frequency current is dissipated as heat within it; its equivalent circuit is an inductor and a resistor in series, with both component values proportional to the length of the ferrite bead. Some ferrite beads have multiple holes; passing the wire through them increases component impedance (proportional to the square of the number of passes through the bead). Ferrite beads can not only be used in power circuits to filter high-frequency noise (suitable for DC and AC outputs) but are also widely used in other circuits.

ALLKABEL electrical component applications

Inductors mainly serve functions such as filtering, oscillation, delay, and wave trapping in circuits, as well as signal selection, noise filtering, current stabilization, and suppression of electromagnetic interference. The most common role of an inductor in a circuit is to form an LC filter circuit together with a capacitor. Capacitors have the characteristic of 'blocking DC and passing AC,' while inductors have the function of 'passing DC and blocking AC.' If DC electricity accompanied by many interference signals passes through an LC filter circuit, the AC interference signals will be converted into thermal energy by the inductor and consumed. When the relatively pure DC current passes through the inductor, the AC interference signals within it are also converted into magnetic induction and thermal energy. Higher frequencies are more easily impeded by the inductor, thereby suppressing higher-frequency interference signals. Inductors have the characteristic of blocking AC while allowing DC to pass smoothly; the higher the frequency, the greater the coil impedance. Therefore, the main functions of inductors are to isolate and filter AC signals, or to form resonant circuits with capacitors, resistors, etc.

ALLKABEL electrical component applications

The most basic application of ordinary thyristors is controlled rectification. The familiar diode rectifier circuit belongs to uncontrolled rectification circuits. If diodes are replaced with thyristors, a controlled rectification circuit can be formed. Taking the simplest single-phase half-wave controlled rectification circuit as an example, during the positive half-cycle of the sinusoidal AC voltage U2, if the gate of VS receives no trigger pulse Ug, VS cannot conduct. Only when U2 is in the positive half-cycle and a trigger pulse Ug is applied to the gate externally, the thyristor is triggered into conduction. Drawing its waveforms (c) and (d), voltage UL appears across the load RL only when the trigger pulse Ug arrives. If Ug arrives early, the thyristor conducts earlier; if Ug arrives late, the thyristor conducts later. By changing the arrival time of the trigger pulse Ug at the gate, the average value UL of the output voltage across the load can be adjusted. In electrical engineering technology, half a cycle of AC is often defined as 180°, called the electrical angle. Thus, in each positive half-cycle of U2, the electrical angle experienced from zero value to the instant the trigger pulse arrives is called the control angle α; the electrical angle during which the thyristor conducts in each positive half-cycle is called the conduction angle θ. Clearly, both α and θ are used to represent the conduction or blocking range of the thyristor during the half-cycle when it withstands forward voltage. By changing the control angle α or conduction angle θ, the average value UL of the pulsed DC voltage across the load is changed, achieving controlled rectification. Low-power plastic-packaged bidirectional thyristors are typically used in sound-and-light-controlled lighting systems. Rated current is less than 6A. Large and medium-power plastic-packaged and metal-can thyristors are typically used in power-type controlled voltage regulation circuits, such as adjustable-output DC power supplies. High-power high-frequency thyristors are typically used in industry, such as in high-frequency melting furnaces.

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