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cab Produkttechnik electrical components are devices that convert alternating current into direct current, and can be used in power supply units and for detecting radio signals, etc. Rectifiers can be made from vacuum tubes, ignitrons, solid-state silicon semiconductor diodes, mercury arcs, etc. Conversely, a device that converts direct current into alternating current is called an "inverter". In standby UPS, it is only necessary to charge the battery, not to supply power to the load, so there is only a charger. In double-conversion UPS, this device supplies power to the inverter and also charges the battery, so it is called a rectifier/charger. A rectifier is a rectification device; simply put, it is a device that converts AC to DC. It has two main functions: first, to convert alternating current into direct current, which is then filtered and supplied to the load or to the inverter; second, to provide charging voltage to the battery. Therefore, it also acts as a charger.

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SMD inductors are electromagnetic induction components wound with insulated wire. They belong to commonly used inductor components. Function of SMD inductors: passing DC and blocking AC is a simple description; they isolate and filter AC signals, or form resonant circuits with capacitors, resistors, etc. Function of tuning and frequency-selecting inductors: an inductor coil connected in parallel with a capacitor can form an LC tuned circuit. Any current in the circuit through an SMD inductor generates a magnetic field, and the magnetic flux of this field acts on the circuit. When the current passing through the SMD inductor changes, the DC voltage potential generated in the SMD inductor will oppose the change in current. When the current through the inductor coil increases, the self-induced electromotive force generated by the inductor coil is opposite to the direction of the current, opposing the increase in current, while converting part of the electrical energy into magnetic energy stored in the inductor; when the current through the inductor coil decreases, the self-induced electromotive force is in the same direction as the current, opposing the decrease in current, while releasing stored energy to compensate for the decrease in current. Therefore, after inductive filtering, not only are the ripples in load current and voltage reduced and the waveform smoothed, but the conduction angle of the rectifier diode also increases. Inductor function 1: Color-ring inductors have a current-blocking effect: the copper core in the color-ring inductor coil always opposes changes in the current in the coil. Color-ring inductors impede the alternating current used in the circuit; the magnitude of this impedance is called inductive reactance XL, measured in ohms. Its relationship with inductance L and AC frequency f is XL=2πfL. Color-ring inductors are mainly classified into high-frequency choke coils and low-frequency choke coils. Inductor function 2: Color-ring inductors have tuning and frequency-selection functions: a color-ring inductor connected in parallel with an electrolytic capacitor can form an LC tuned circuit. At resonance, the inductive reactance and capacitive reactance of the circuit are equal in magnitude but opposite in direction, meaning the natural oscillation frequency f0 of the circuit equals the frequency f of the non-AC signal, so the inductive and capacitive reactances of the loop are also equal. The usage frequency of color-ring inductors is generally not very high, and color-ring inductors used in circuits are generally quite stable. Inductor function 10: The main uses of color-ring inductors include signal screening, noise filtering, current stabilization, and suppression of electromagnetic interference. The basic function of color-ring inductors is charging and discharging, but many circuit phenomena derived from this basic charging and discharging action give color-ring inductors various different applications. Today, color-ring inductors are widely used by customers; although small, their role cannot be underestimated.

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Like ordinary diodes, light-emitting diodes (LEDs) are composed of a PN junction and also exhibit unidirectional conductivity. When a forward voltage is applied to an LED, holes injected from the P region into the N region and electrons injected from the N region into the P region recombine with electrons in the N region and holes in the P region, respectively, within a few micrometers near the PN junction, producing spontaneous radiation fluorescence. The energy states of electrons and holes differ in different semiconductor materials. The amount of energy released when electrons and holes recombine varies; the more energy released, the shorter the wavelength of the emitted light. Commonly used are diodes that emit red, green, or yellow light. The reverse breakdown voltage of an LED is greater than 8 volts. Its forward volt-ampere characteristic curve is very steep, so a current-limiting resistor must be connected in series during use to control the current through the diode. The core part of an LED consists of a wafer made of P-type semiconductor and N-type semiconductor. Between the P-type semiconductor and the N-type semiconductor is a transition layer called the PN junction. In the PN junction of certain semiconductor materials, when injected minority carriers recombine with majority carriers, excess energy is released in the form of light, thereby directly converting electrical energy into light energy. When a reverse voltage is applied to the PN junction, minority carriers are difficult to inject, so no light is emitted. When it is in forward operating state (i.e., a forward voltage is applied across its terminals), current flows from the LED anode to the cathode, and the semiconductor crystal emits light of different colors from ultraviolet to infrared; the intensity of the light is related to the current.

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To obtain information from the external world, humans must rely on their sensory organs. However, relying solely on human sensory organs is far insufficient for studying natural phenomena and laws, as well as for their functions in production activities. To adapt to this situation, sensors are required. Therefore, it can be said that sensors are an extension of the human five senses, also known as electronic senses. With the advent of the new technological revolution, the world has begun to enter the information age. In the process of utilizing information, the primary issue to address is acquiring accurate and reliable information, and sensors are the main channel and means for obtaining information in the fields of nature and production. In modern industrial production, especially in automated production processes, various sensors are used to monitor and control various parameters in the production process, ensuring that equipment operates in a normal or optimal state and that products achieve the best quality. Therefore, it can be said that without numerous high-quality sensors, modern production would lose its foundation. In basic discipline research, sensors hold an even more prominent position. The development of modern science and technology has entered many new fields: for example, observing the vast universe spanning thousands of light-years on a macro scale, observing the particle world as small as fm on a micro scale, observing celestial evolution spanning hundreds of thousands of years vertically, and instantaneous reactions as short as s. In addition, various extreme technology studies have emerged, playing an important role in deepening the understanding of matter, exploring new energy sources, and developing new materials, such as ultra-high temperature, ultra-low temperature, ultra-high pressure, ultra-high vacuum, ultra-strong magnetic fields, and ultra-weak magnetic fields. Obviously, it is impossible to obtain a large amount of information that human senses cannot directly access without appropriate sensors. Many obstacles in basic scientific research lie first in the difficulty of obtaining object information, and the emergence of some new mechanisms and high-sensitivity detection sensors often leads to breakthroughs in these fields. The development of some sensors is often the pioneer of interdisciplinary development. Sensors have long penetrated into extremely broad fields such as industrial production, space exploration, ocean detection, environmental protection, resource surveys, medical diagnosis, bioengineering, and even cultural relic preservation. It is no exaggeration to say that from the vastness of space to the expansiveness of the ocean, and even various complex engineering systems, almost every modern project relies on various types of sensors.

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