engel electrical components Germany engel model engel price

engel electrical components are devices that convert optical signals into electrical signals. Their operating principle is based on the photoelectric effect. The photoelectric effect refers to the phenomenon where electrons in a material absorb photon energy when light strikes certain substances, resulting in corresponding electrical effects. Based on the different manifestations of the photoelectric effect, it is classified into three categories: external photoelectric effect, internal photoelectric effect, and photovoltaic effect. Photoelectric devices include phototubes, photomultiplier tubes, photoresistors, photodiodes, phototransistors, and solar cells. The performance and characteristic curves of photoelectric devices are analyzed.

engel electrical component characteristics

So-called dynamic characteristics refer to the output behavior of a sensor when the input changes. In practical applications, the dynamic characteristics of a sensor are often expressed by its response to certain standard input signals. This is because the sensor's response to standard input signals can be easily determined through experimental methods, and there is a certain relationship between its response to standard input signals and its response to arbitrary input signals; often, knowing the former allows inference of the latter. The most commonly used standard input signals are step signals and sinusoidal signals, so the dynamic characteristics of sensors are also commonly expressed by step response and frequency response.

engel electrical component applications

Semiconductor diodes are used in almost all electronic circuits. The use of semiconductor diodes in circuits can protect the circuit and extend circuit life. The development of semiconductor diodes has optimized integrated circuits and played a positive role in various fields. Diodes play many roles in integrated circuits, maintaining their normal operation. The following briefly introduces the role of diodes in the following four types of circuits. (1) Switching circuits: In digital and integrated circuits, the unidirectional conductivity of diodes is utilized to achieve circuit conduction or disconnection; this technology has been widely applied. Switching diodes can effectively protect circuits from damage due to short circuits and other issues, and can also realize the functions of traditional switches. Another characteristic of switching diodes is their fast switching speed, which is incomparable to traditional switches. (2) Limiter circuits: In electronic circuits, limiter circuits are commonly used to process various signals. They are used to selectively transmit part of the signal within a preset voltage level range. Most diodes can be used for limiting, but sometimes specialized limiter diodes are required, such as when protecting instruments. (3) Voltage regulator circuits: Zener diodes are typically used in voltage regulator circuits. They are junction-type silicon semiconductor diodes manufactured using special processes. These special diodes have high impurity concentrations and high charge density in the space charge region, making it easy to form a strong electric field. When the reverse voltage across the Zener diode reaches a certain value, the reverse current increases sharply, causing reverse breakdown. (6) Varactor circuits: Varactor diodes are commonly used in varactor circuits to achieve automatic frequency control, tuning, frequency modulation, and scanning oscillation.

engel electrical component principles

P-type semiconductors are formed by doping intrinsic semiconductors (a completely pure, structurally perfect semiconductor crystal) with a small amount of trivalent impurities, such as boron. Since boron atoms have only three valence electrons, they form covalent bonds with surrounding silicon atoms. Due to the lack of one electron, a vacancy is created in the crystal. When electrons in adjacent covalent bonds gain energy, they may fill this vacancy, turning the boron atom into an immobile negative ion, while the original silicon atom's covalent bond forms a hole due to the missing electron. However, the entire semiconductor remains neutral. In this type of P-type semiconductor, conduction is primarily via holes, which are the majority carriers, while free electrons are the minority carriers. The principle of N-type semiconductor formation is similar to that of P-type. Pentavalent atoms, such as phosphorus, are doped into the intrinsic semiconductor. After doping, they form covalent bonds with silicon atoms, generating free electrons. In N-type semiconductors, electrons are the majority carriers, and holes are the minority carriers. Therefore, doping trivalent and pentavalent impurities into two different regions of an intrinsic semiconductor forms P-type and N-type regions. Based on the characteristics of N-type and P-type semiconductors, it is known that a concentration difference of electrons and holes appears at their junction. Electrons and holes diffuse from areas of high concentration to areas of low concentration, disrupting the electrical neutrality at the original junction. PN junction unidirectional conductivity: When a forward voltage V is applied externally to the PN junction, the equilibrium state of the PN junction is broken under the influence of this external electric field. Holes in the P region and electrons in the N region move toward the PN junction. Holes neutralize negative ions in the P region of the PN junction, and electrons neutralize positive ions in the N region of the PN junction, thereby narrowing the PN junction. As the external electric field increases, diffusion motion further intensifies, and drift motion weakens. When the external voltage exceeds the threshold voltage, the PN junction acts as a resistor with very low resistance, meaning the PN junction is conducting.

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