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assa abloy electrical components: names for circuit boards include ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, printed wiring boards, PCB boards, aluminum substrate boards, high-frequency boards, thick copper boards, impedance boards, PCB, ultra-thin printed wiring boards, ultra-thin circuit boards, and printed (copper etching technology) circuit boards. Circuit boards miniaturize and visualize circuits, playing an important role in the mass production of fixed circuits and optimizing appliance layouts. Circuit boards may be referred to as printed wiring boards or printed circuit boards. Flexible printed wiring boards and flexible circuit boards are highly reliable, highly flexible printed circuit boards made with polyimide or polyester film as the base material. They feature high wiring density, light weight, thin profile, and good bendability.) and rigid-flex boards—the emergence and development of FPC and PCB have spurred the new product category of rigid-flex boards. Therefore, rigid-flex boards are circuit boards formed by combining flexible printed wiring boards and rigid printed wiring boards through lamination and other processes according to relevant process requirements, resulting in a board with both FPC characteristics and PCB characteristics.

assa abloy electrical component parameters

The main parameters of potentiometers include nominal resistance, rated power, resolution, sliding noise, resistance variation characteristic, wear resistance, zero-position resistance, and temperature coefficient. 1. Rated power: the maximum power allowed to be dissipated across the two fixed terminals of a potentiometer is its rated power. Note that the rated power is not equal to the power between the center tap and a fixed terminal. The rated power of a potentiometer refers to the maximum power allowed to be consumed under long-term continuous load at the specified rated temperature in DC or AC circuits when the atmospheric pressure is 87~107kPa. 2. Nominal resistance: the nominal resistance value marked on the product, with series similar to those of resistors. 3. Tolerance class: the error range between the measured resistance and the nominal resistance allows for errors of 20%, 10%, 5%, 2%, and 1% depending on the precision class. The precision of precision potentiometers can reach 0.1%. 5. Resistance variation law: refers to the relationship between resistance change and the rotation angle (or sliding travel) of the wiper contact. This relationship can take any functional form; common types include linear, logarithmic, and reverse logarithmic (exponential). In use, linear potentiometers are suitable as voltage dividers; reverse logarithmic (exponential) potentiometers are suitable as volume controls in radios, tape recorders, phonographs, and televisions. If a replacement of the same type is unavailable during maintenance, a linear type may be used as a substitute, but a logarithmic type is not recommended. Logarithmic potentiometers are only suitable for tone control, etc.

assa abloy electrical component classification

Generator classifications include: (1) Generators are divided into DC generators and AC generators; (2) AC generators are divided into synchronous generators and asynchronous generators (rarely used); (3) AC generators can also be divided into single-phase generators and three-phase generators. There are many types of generators. By principle, they are divided into synchronous generators, asynchronous generators, single-phase generators, and three-phase generators. By generation method, they are divided into steam turbine generators, hydroelectric generators, diesel generators, gasoline generators, etc. By energy source, they are divided into thermal power generators, hydropower generators, etc.

assa abloy electrical component structure

A bipolar junction transistor consists of three differently doped semiconductor regions: the emitter region, the base region, and the collector region. In NPN type transistors, these regions are N-type, P-type, and N-type semiconductors, respectively, while in PNP type transistors, 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 and 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 10, while the common-emitter current gain achieves a larger value. From the cross-sectional diagram of this 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. Additionally, the emitter has a relatively high doping concentration. Under normal circumstances, the 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, swapping the connections of the collector and emitter in the circuit will move the transistor out of the forward active region into the reverse active region. The internal structure of the transistor determines its suitability 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 NPN-type transistors, 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 level, followed by the collector region, while the base region has the lowest doping level. Furthermore, the physical dimensions of the three regions 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 to the collector-base junction, provided that this reverse bias is not excessive enough 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 cause significant changes in the current between the emitter and collector. Utilizing this property allows for the amplification of input current or voltage. 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 viewed as a voltage-controlled current source or as a current-controlled voltage source. Additionally, 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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