Lohmeier electrical components, German Lohmeier models, Lohmeier prices

Lohmeier electrical components include resistors, capacitors, inductors, diodes, transistors, field-effect transistors, thyristors, transformers, relays, sensors, etc. Electronic devices include analog circuits (operational amplifiers, comparators, signal conditioners), logic circuits (flip-flops, counters, decoders, registers, transceivers, NOT gates, AND gates, OR gates, NAND gates, NOR gates, XOR gates), microcontrollers, memory, digital potentiometers, signal conversion circuits (A/D converters, D/A converters, voltage-to-frequency converters), communication circuits (various interface circuits), and monitoring/reset circuits (power supply monitoring, program monitoring), among countless others.

Lohmeier 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 terminal lead, 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 junction is reverse-biased, it is difficult for electrons to be injected from here into the base region. This results in a common-base current gain of approximately 2, while the common-emitter current gain achieves a larger value. From the simplified 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. Furthermore, the emitter has a relatively high doping concentration. Under normal circumstances, the various 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 cause the transistor to 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; therefore, 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, followed by the collector region, while the base region has the lowest doping concentration. Additionally, 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 applied to the collector 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 terminals cause significant changes in the current between the emitter and collector. Utilizing this property allows for the amplification of input current or voltage. 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 viewed 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 load requirement on the preceding stage circuit.

Lohmeier electrical component functions

The self-induced electromotive force in an inductor coil always opposes changes in the current within the coil. The inductor coil impedes alternating current; 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. Inductors are mainly classified into high-frequency choke coils and low-frequency choke coils. An inductor coil connected in parallel with a capacitor forms an lc tuned circuit. When the natural oscillation frequency f0 of the circuit equals the frequency f of the AC signal, the inductive reactance and capacitive reactance of the loop are equal. Consequently, electromagnetic energy oscillates back and forth between the inductor and the capacitor; this is the resonance phenomenon of the lc loop. At resonance, the inductive and capacitive reactances are equal in magnitude but opposite in phase, resulting in minimum total impedance and maximum current in the loop (for an AC signal where f="f6"). The lc resonant circuit has frequency selection capability, allowing it to select AC signals of a specific frequency f.

Lohmeier electrical component characteristics

LED lamps are light-emitting diodes (LEDs) that use solid-state semiconductor chips as the light-emitting material. Compared with traditional lamps, LED lamps are energy-efficient, environmentally friendly, and offer good color rendering and response speed. (1) Energy efficiency is the most prominent feature of LED lamps in terms of energy consumption; the energy consumption of an LED lamp is one-tenth that of an incandescent lamp and one-quarter that of an energy-saving lamp. This is a major advantage of LED lamps. As people increasingly prioritize energy conservation and environmental protection, this energy-saving characteristic has led to widespread application and popularity of LED lamps. (2) They can operate in high-speed switching states. When walking on the street, one observes that screens or displays composed of LED elements change rapidly, indicating that LED lamps can perform high-speed switching. In contrast, ordinary incandescent lamps cannot achieve such operating states; excessive switching directly causes filament breakage. This is another important reason for the popularity of LED lamps. (3) Environmental friendliness: LED lamps do not contain any heavy metals such as mercury, whereas fluorescent lamps do, highlighting the environmental advantage of LED lamps. Given the current emphasis on environmental protection, more people are willing to choose eco-friendly LED lamps. (4) Fast response speed is another outstanding feature of LED lamps; they react quickly. As soon as power is connected, the LED lamp lights up immediately. Compared with commonly used energy-saving lamps, the response is faster; traditional bulbs often require a long time to illuminate a room, lighting up only after fully heating up. (5) Compared with other light sources, LED lamps are "cleaner." The term "clean" does not refer to the cleanliness of the lamp surface or interior, but rather that the lamp is a cold light source, generating little heat and thus not attracting insects that are attracted to light and heat. This is particularly relevant in summer in rural areas, where there are many insects. Some insects are naturally heat-seeking; incandescent and energy-saving lamps generate heat after prolonged use, which attracts these insects. This inevitably brings pollutants onto the lamp surface, and insect excrement can dirty indoor environments. However, as LED lamps are cold light sources, they do not attract insects, thereby avoiding insect excrement. Thus, LED lamps are "cleaner." Semiconductor light-emitting diodes have a wide range of applications, low power consumption, long service life, and are low-carbon and environmentally friendly. In China, semiconductor LEDs are widely used; many lighting fixtures in residential homes use them, most streetlights use LED lamps as the light source, and some road lighting combines solar technology to save substantial electrical energy. Photodiodes can be classified by material into aluminum gallium arsenide photodiodes, aluminum gallium phosphide photodiodes, gallium phosphide photodiodes, and aluminum arsenide photodiodes.

Weidou Intelligent Technology specializes in selling German Lohmeier connectors, Lohmeier switches, Lohmeier relays, Lohmeier controllers, Lohmeier plugs, Lohmeier sensors, Lohmeier resistors, Lohmeier capacitors, Lohmeier buses, Lohmeier modules, Lohmeier cables, Lohmeier power supplies, Lohmeier interfaces, Lohmeier gateways, and Lohmeier circuit breakers. Lohmeier products are original imports from Germany. Customers are welcome to inquire and place orders.