prysmian electrical components Germany prysmian model prysmian price

prysmian electrical component is a varactor diode, also known as a "variable reactance diode," made using the characteristic that the junction capacitance of a PN junction under reverse bias changes with the applied voltage. As the reverse bias voltage increases, the junction capacitance decreases; conversely, it increases. The capacitance of a varactor diode is generally small, with a maximum value ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, such as serving as a variable capacitor in the tuning circuit of a television receiver. Main parameters include: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, center reverse bias voltage, nominal capacitance, capacitance variation range (in picofarads), and cutoff frequency.

prysmian electrical component principle

It mainly consists of an LC circuit composed of capacitors and inductors, generating free oscillation through the mutual conversion of electric field energy and magnetic field energy. To sustain oscillation, an amplifier circuit with positive feedback is required. LC oscillators are further divided into transformer-coupled and three-point oscillators. Many applications use quartz crystal oscillators, and there are also LC oscillators composed of integrated operational amplifiers. Since device parameters cannot be perfectly identical, the states of the two transistors change at the moment of power-on. This change becomes increasingly strong due to positive feedback, leading to a quasi-stable state. During the quasi-stable period, the other transistor gradually charges through the capacitor and then conducts or cuts off, causing the state to flip and reach another quasi-stable state. This cycle repeats to form oscillation.

prysmian electrical component principle

A photodiode is a semiconductor device that converts optical signals into electrical signals. Its core part is also a PN junction. Compared with ordinary diodes, the structural difference is that the PN junction area is made as large as possible to facilitate the reception of incident light, the electrode area is made as small as possible, and the junction depth of the PN junction is very shallow, generally less than 2 micrometers. Photodiodes operate under reverse voltage. When there is no light, the reverse current is very small, called dark current. When illuminated, photons carrying energy enter the PN junction and transfer energy to bound electrons in covalent bonds, causing some electrons to break free from the covalent bonds, thereby generating electron-hole pairs, known as photogenerated carriers. Under the action of reverse voltage, they participate in drift motion, significantly increasing the reverse current. The greater the light intensity, the larger the reverse current. This characteristic is called "photoconductivity." The current generated by a photodiode under general illumination is called photocurrent. If a load is connected in the external circuit, the load receives an electrical signal, which changes correspondingly with the light. Photodiodes are widely used photosensitive devices in electronic circuits. Like ordinary diodes, photodiodes have a PN junction. The difference is that the photodiode housing has a transparent window to receive light irradiation, achieving photoelectric conversion. The text symbol in circuit diagrams is generally VD.

prysmian electrical component classification

1, fuse resistor: Also known as a fusing 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 melts like a fuse, disconnecting the connected circuit. Fuse resistors generally have low resistance values and low power ratings. 2, sensitive resistors: These refer to resistors whose resistance values are 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 of a thermistor changes with temperature; if the resistance decreases as temperature rises, it is a negative temperature coefficient (NTC) thermistor. NTC thermistors are widely used and can be further divided into standard NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. A photoresistor's resistance changes with the intensity of incident light; when incident light increases, the resistance of the photoresistor decreases, and when incident light weakens, the resistance increases.

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