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kraemer kraus electrical components refer to electronic components that generate resonant frequencies. Common types include quartz crystal resonators and ceramic resonators. They serve the function of generating frequencies and are characterized by stability and good anti-interference performance, making them widely used in various electronic products. The frequency accuracy of quartz crystal resonators is higher than that of ceramic resonators, but their cost is also higher. Resonators primarily serve a frequency control function; all electronic products involving frequency transmission and reception require resonators. Based on their physical form, resonators can be classified into two types: through-hole and surface-mount.

kraemer kraus electrical component applications

The basic circuits of analog integrated circuits include current sources, single-stage amplifiers, filters, feedback circuits, and current mirror circuits. Higher-level basic circuits composed of these include operational amplifiers and comparators. Even higher-level circuits include switched-capacitor circuits, phase-locked loops, and ADC/DAC. Based on the response relationship between output and input signals, analog integrated circuits can be divided into two major categories: linear integrated circuits and nonlinear integrated circuits. The response between the output and input signals of the former is usually linear; the shape of the output signal is similar to that of the input signal, only amplified by a fixed coefficient. In contrast, the response of the output signal to the input signal in nonlinear integrated circuits exhibits a nonlinear relationship, such as square or logarithmic relationships, hence they are called nonlinear circuits. Common nonlinear circuits include oscillators, timers, and phase-locked loop circuits. Typical applications of analog integrated circuits are shown in the figure below. External natural signals collected by various sensors (temperature, humidity, optical, piezoelectric, acoustic-electric) or antennas are preprocessed by analog circuits and converted into suitable digital signals for input into digital systems. Signals processed by the digital system are then post-processed by analog circuits and converted into analog signals such as sound, images, and radio waves for output.

kraemer kraus electrical component composition

Transformer components include the core assembly (core, windings, insulation, leads), transformer oil, tank and cooling device, voltage regulation device, protection devices (moisture absorber, safety air duct, gas relay, oil conservator, and temperature measuring device, etc.), and outlet bushings. Specific composition and functions: (1) The core is the main magnetic circuit part of the transformer. It is usually made of stacked hot-rolled or cold-rolled silicon steel sheets with high silicon content and surfaces coated with insulating varnish. The core is divided into two parts: the core column and the yoke. The core column is fitted with windings, while the yoke is used to close the magnetic circuit. (2) The winding is the circuit part of the transformer, wound using double-silk-insulated flat wire or enamel-coated round wire. The basic principle of a transformer is electromagnetic induction. Taking a single-phase two-winding transformer as an example to explain its basic working principle: when voltage is applied to the primary winding, current flows, generating alternating magnetic flux in the core. This flux is called the main flux. Under its influence, electromotive forces are induced in the windings on both sides, ultimately driving the transformer's regulation device.

kraemer kraus electrical component principles

When a high-frequency current passes through a conductor, it generates an electric field and a magnetic field in the surrounding space. Based on the distribution characteristics of the electromagnetic field in space, it can be divided into the near zone, intermediate zone, and far zone. Let R be the distance from a point in space to the conductor. The region where R ﹤﹤ λ/2π is called the near zone. In this zone, the electromagnetic field is closely linked to the current and voltage in the conductor. The region where R ﹥﹥ λ/2π is called the far zone. In this region, the electromagnetic field can leave the conductor and propagate through space. Its changes lag behind the current and voltage on the conductor by a certain period. At this point, the propagated electromagnetic wave is no longer directly linked to the current and voltage on the wire. The electromagnetic field in this region is called the radiation field. It must be pointed out that when the length of the wire L is much smaller than the wavelength λ, radiation is very weak. When the length of the wire L increases to be comparable to the wavelength, the current on the wire increases significantly, thereby forming stronger radiation. Transmitting antennas utilize this property of the radiation field, allowing transmitted signals to radiate fully into space after passing through the transmitting antenna. How can a conductor become an effective radiating system? Here, we first analyze the situation on a transmission line. On a parallel two-wire transmission line, to ensure energy transmission without radiation, the structure of the two wires must be symmetrical. The magnitude of the current at corresponding points on the lines must be equal and opposite in direction, and the distance between the two wires<π. To effectively radiate the electromagnetic field, this symmetry of the transmission line must be broken. Methods such as separating the two conductors at a certain angle or removing one side can break the conductor's symmetry and produce radiation. By separating the open-circuit transmission line or the conductor at a distance of π/4 from the terminal in a straight line, the current on the terminal conductor becomes in-phase rather than anti-phase. This causes the radiation fields of this conductor segment at spatial points to superimpose in phase, constituting an effective radiation system. This is the simplest and most basic unit antenna, known as a half-wave dipole antenna, with a characteristic impedance of 80Ω. After electromagnetic waves are radiated from the transmitting antenna, they propagate in all directions. If a symmetric dipole is placed in the direction of electromagnetic wave propagation, an induced electromotive force will be generated on the antenna dipole under the action of the electromagnetic wave. If the antenna is connected to receiving equipment at this time, a high-frequency current will be generated at the input end of the receiving equipment. In this way, the antenna acts as a receiver, converting electromagnetic waves into high-frequency current. That is, the antenna serves as a receiving antenna. The quality of reception depends not only on the strength of the radio waves but also on the directivity of the antenna and the matching between the half-wave symmetric dipole and the receiving equipment.

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