Peter Electronic electrical components Germany Peter Electronic model Peter Electronic price

Peter Electronic electrical components are commonly used temperature-sensing elements in temperature measurement instruments. They directly measure temperature and convert the temperature signal into a thermoelectric EMF signal, which is then converted into the temperature of the measured medium by an electrical instrument (secondary instrument). The external shapes of various thermocouples often differ significantly depending on requirements, but their basic structures are largely similar, typically consisting of main parts such as hot electrodes, insulating protective tubes, and terminal blocks. They are usually used in conjunction with display instruments, recording instruments, and electronic regulators. In industrial production processes, temperature is one of the important parameters that need to be measured and controlled. In temperature measurement, thermocouples are widely used. They have many advantages, such as simple structure, ease of manufacturing, wide measurement range, high accuracy, low inertia, and output signals that are easy to transmit over long distances. In addition, since a thermocouple is a passive sensor that does not require an external power supply during measurement, it is very convenient to use. Therefore, it is often used to measure the temperature of gases or liquids inside furnaces and pipes, as well as the surface temperature of solids.

Peter Electronic electrical component principle

Light emission principle of laser diodes: The P-N junction in a laser diode is formed by two doped gallium arsenide layers. It has a parallel-end structure, parallel to a mirror at one end (highly reflective surface) and a partially reflective surface at the other. The wavelength of the emitted light is directly related to the length of the junction. When the P-N junction is forward-biased by an external voltage source, electrons move through the junction and recombine as in a conventional diode. When electrons recombine with holes, photons are released. These photons strike atoms, causing more photons to be released. As the forward bias current increases, more electrons enter the depletion region, leading to the emission of more photons. Eventually, some photons drifting randomly within the depletion region strike the reflective surfaces perpendicularly and are reflected back along their original paths. The reflected photons are again reflected from the other end of the junction. This movement of photons from one end to the other occurs continuously multiple times. During the photon movement, due to the avalanche effect, more atoms release more photons. This process of reflection and generation of increasing numbers of photons produces a very intense laser beam. Each photon generated in the emission process described above is identical to other photons in energy level, phase relationship, and frequency. Therefore, the emission process yields a laser beam of a single wavelength. To generate a laser beam, the current of the laser diode must exceed a certain threshold level. Currents below the threshold level force the diode to behave as an LED, emitting incoherent light.

Peter Electronic electrical component parameters

(1) Nominal capacitance is the capacitance value marked on the capacitor. However, there is a deviation between the actual capacitance of a capacitor and its nominal capacitance. The accuracy class corresponds to the permissible error. General capacitors commonly use classes I, II, and III, while electrolytic capacitors use classes IV, V, and VI to indicate capacitance accuracy, selected according to the application. The capacitance value of an electrolytic capacitor depends on the impedance presented when operating under AC voltage. The capacitance value changes with variations in operating frequency, temperature, voltage, and measurement method. The unit of capacitance is F (farad). Since a capacitor is a "container" for storing electric charge, the issue of "capacity" size arises. To quantify the ability of a capacitor to store electric charge, the physical quantity known as capacitance is defined. A capacitor can only store electric charge under the influence of an applied voltage. Different capacitors may store different amounts of charge under the same voltage. Internationally, it is uniformly specified that when a DC voltage of 1 volts is applied to a capacitor, the amount of charge it can store is defined as the capacitance of that capacitor (i.e., the charge per unit voltage), denoted by the letter C. The basic unit of capacitance is the farad (F). (2) Rated voltage is the maximum DC voltage that can be continuously applied to the capacitor at the minimum and rated ambient temperatures. If the operating voltage exceeds the voltage rating of the capacitor, the capacitor will break down, causing damage. In practice, as the temperature rises, the voltage rating will decrease. (3) Insulation resistance. When a DC voltage is applied across a capacitor, a leakage current is produced. The ratio of the voltage to the leakage current is called the insulation resistance. For small capacitors, the value mainly depends on the surface condition of the capacitor. Generally, the higher the insulation resistance, the better. (4) Loss. The energy consumed by heat generation per unit time in a capacitor under the action of an electric field is called loss. Loss is related to the frequency range, dielectric material, conductivity, and the resistance of the metallic parts of the capacitor. (12) Frequency characteristics. As the frequency increases, the capacitance of general capacitors tends to decrease. When a capacitor operates below its resonant frequency, it behaves capacitively; when it exceeds its resonant frequency, it behaves inductively, meaning it is no longer a capacitor but an inductor. Therefore, it is essential to avoid operating capacitors above their resonant frequency.

Peter Electronic electrical component structure

A bipolar transistor consists of three differently doped semiconductor regions: the emitter region, the base region, and the collector region. In an NPN type transistor, these regions are N-type, P-type, and N-type semiconductors, respectively, whereas in a PNP type transistor, they are P-type, N-type, and P-type semiconductors, respectively. Each semiconductor region has a lead terminal, typically denoted by the letters E, B, and C for the emitter, base, and collector, respectively. The base is physically located between the emitter and the collector. It is made of lightly doped, high-resistivity material. The collector surrounds the base region. Since the collector-base junction is reverse-biased, it is difficult for electrons to be injected from here into the base region, resulting in a common-base current gain of approximately 1, while the common-emitter current gain achieves a larger value. From the simplified cross-sectional diagram of a typical NPN-type bipolar transistor on the right, it can be seen that the area of the collector junction is larger than that of the emitter junction. In addition, the emitter has a relatively high doping concentration. Under normal circumstances, the several regions of a bipolar transistor are not symmetric in physical properties or geometric dimensions. Assuming the transistor connected in the circuit is in the forward active region, if the connections of the collector and emitter in the circuit are swapped, the transistor will leave the forward active region and enter the reverse active region. The internal structure of the transistor determines that it is suitable for operation in the forward active region, so the common-base and common-emitter current gains in the reverse active region are much smaller than when the transistor is in the forward active region. This functional asymmetry is fundamentally due to the different doping levels of the emitter and collector. Therefore, in an NPN-type transistor, although both the collector and emitter are N-type doped, their electrical properties and functions are completely non-interchangeable. The emitter region has the highest doping concentration, the collector region is next, and the base region has the lowest doping concentration. In addition, the physical dimensions of the three regions also differ; the base region is very thin, and the collector area is larger than the emitter area. Due to this material structure of the bipolar transistor, a reverse bias can be provided for the collector-base junction, provided that this reverse bias is not so large as to damage the transistor. The purpose of heavy doping of the emitter is to increase the efficiency of electron injection from the emitter into the base region, thereby achieving the highest possible current gain. In the common-emitter configuration of a bipolar transistor, small changes in the voltage applied across the base and emitter terminals cause significant changes in the current between the emitter and collector. Utilizing this property, input current or voltage can be amplified. By treating the base of the bipolar transistor as the input terminal and the collector as the output terminal, this two-port network can be analyzed using Thévenin's theorem. Based on equivalent principles, the bipolar transistor can be regarded as a voltage-controlled current source or as a current-controlled voltage source. Furthermore, looking into the left side of the two-port network, the input impedance at the base is reduced to the base resistance, thus lowering the loading requirement on the preceding stage circuit.

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