mk illumination electrical components German mk illumination model mk illumination price

mk illumination electrical components are surge absorbers/varistor assemblies. Due to the nonlinear resistance change with respect to voltage, they exhibit symmetry in both directions (positive and reverse). They respond to abnormal voltages on the line, absorbing most of the surge energy while suppressing the abnormal voltage to a safe range, thereby improving line safety and stability. In the standby state, the surge absorber (varistor) has very high impedance (several megohms) relative to the protected electronic components and does not affect the characteristics of the original circuit design. However, when an instantaneous surge voltage occurs (exceeding the breakdown voltage of the surge absorber), the impedance of the surge absorber drops low (to only a few ohms), causing a short circuit in the line, thereby protecting electronic products or more expensive components.

mk illumination electrical component function

Photoelectric switches can be used in various application scenarios. Avoid strong light sources; photoelectric switches generally operate stably under high ambient illumination. However, avoid aligning the sensor's optical axis directly with strong light sources such as sunlight or incandescent lamps. If the angle between the sensor (receiver) optical axis and the strong light source cannot be changed, install shading plates around the top of the sensor or fit a long shading tube. To prevent mutual interference: New photoelectric switches usually have automatic mutual interference prevention functions, so mutual interference is generally not a concern. However, for HGK series through-beam infrared photoelectric switches installed in several adjacent groups close together, mutual interference between neighboring groups should be prevented. The most effective way to prevent this interference is to cross-set the emitters and receivers. When there are more than 9 groups, increase the spacing between groups. Of course, using models with different operating frequencies is also a good method. For reflective photoelectric switches, an effective way to prevent mutual interference is to increase the spacing. The greater the detection distance, the larger the spacing should be; the specific spacing should be determined based on debugging conditions. Of course, models with different operating frequencies can also be used. Influence of mirror angle: When the detected object is glossy or encounters a smooth metal surface, the reflectivity is generally very high, acting like a mirror. Adjust the installation so that the optical axis is not perpendicular to the detected object to prevent malfunction. Eliminating background influence: When using reflective diffuse emitters and receivers, unstable detection may occur if the detected object is close to the background, or if the photoelectric switch or background is a smooth object with high reflectivity. Therefore, you can switch to distance-limited emitters and receivers, or eliminate the influence by moving away from the background, removing the background, painting the background matte black, or making the background rough and dark. Use of self-diagnosis function: During installation or use, minor issues such as slight optical axis deviation due to table or background influence, vibration, lens contamination, dust accumulation, external noise, or out-of-range ambient temperature may occur. These issues may cause the photoelectric switch to deviate from its stable operating zone. In such cases, the self-diagnosis function of the photoelectric switch can be used to trigger the green stable indicator light, alerting the user to make timely adjustments.

mk illumination 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 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, resulting in a common-base current gain of approximately 7, while the common-emitter current gain achieves a larger value. From the 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. Additionally, the emitter has a relatively high doping concentration. Under normal circumstances, the regions of a bipolar transistor are asymmetric in physical properties and 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; 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 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 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 loading requirements on the preceding stage circuit.

mk illumination electrical component principle

Photoelectric sensors generally consist of 2 parts: processing channels and processing elements. Their basic principle is based on the photoelectric effect, converting changes in the measured quantity into changes in optical signals, and then further converting non-electrical signals into electrical signals via photoelectric elements. The photoelectric effect refers to the phenomenon where light irradiating an object can be viewed as a stream of photons with certain energy bombarding the object. At this time, photon energy is transferred to electrons, with the entire energy of one photon being absorbed by one electron at once. After gaining the energy transferred by the photon, the state of the electron changes, thereby generating corresponding electrical effects in the irradiated object. The photoelectric effect is usually classified into 11 categories: (1) The phenomenon where electrons escape from the object surface under light irradiation is called the external photoelectric effect, such as in phototubes and photomultiplier tubes; (2) The phenomenon where the resistivity of an object changes under light irradiation is called the internal photoelectric effect, such as in photoresistors and phototransistors; (3) The phenomenon where an object generates an electromotive force in a specific direction under light irradiation is called the photovoltaic effect, such as in photocells. Photoelectric detection methods offer advantages such as high precision, fast response, and non-contact operation. Moreover, they can measure many parameters, and the sensor structure is simple and flexible. Therefore, photoelectric sensors are widely used in detection and control. Photoelectric sensors are key components for achieving photoelectric conversion in various photoelectric detection systems; they are devices that convert optical signals (visible and ultraviolet laser light) into electrical signals. Photoelectric sensors use photoelectric devices as conversion elements. They can be used to detect non-electrical physical quantities that directly cause changes in light intensity, such as light intensity, illuminance, radiation temperature measurement, and gas composition analysis. They can also be used to detect other non-electrical quantities that can be converted into changes in light intensity, such as part diameter, surface roughness, strain, displacement, vibration, speed, acceleration, as well as object shape and working status recognition. Photoelectric sensors feature non-contact operation, fast response, and reliable performance, so they are widely used in industrial automation devices and robots. The continuous emergence of new photoelectric devices, especially the birth of CCD image sensors, has opened a new chapter for the further application of photoelectric sensors.

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