issendorff electrical components Germany issendorff model issendorff price

issendorff electrical components are photodetectors that convert light into current or voltage signals depending on the mode of use. The die typically uses a PN junction with photosensitive characteristics, which is highly sensitive to changes in light, exhibits unidirectional conductivity, and changes its electrical properties with different light intensities; therefore, the current in the circuit can be changed by varying the light intensity. Photodiodes are also called photoelectric diodes. Photodiodes are similar in structure to semiconductor diodes; their die is a PN junction with photosensitive characteristics and has unidirectional conductivity, therefore a reverse voltage must be applied during operation. When there is no illumination, there is a very small saturated reverse leakage current, i.e., dark current, at which point the photodiode is cut off. When exposed to light, the saturated reverse leakage current increases significantly, forming a photocurrent that varies with the intensity of the incident light. When light irradiates the PN junction, it can generate electron-hole pairs in the PN junction, increasing the density of minority carriers. These carriers drift under reverse voltage, causing the reverse current to increase. Therefore, the current in the circuit can be changed by varying the light intensity.

issendorff electrical component principle

The thermistor will remain in a non-tripped state for extended periods; when the ambient temperature and current are in the c region, the heat dissipation power of the thermistor is close to its heat generation power, so it may or may not trip. For a given ambient temperature, the tripping time of the thermistor decreases sharply as the current increases; at relatively higher ambient temperatures, the thermistor has a shorter tripping time and lower holding and tripping currents. The PTC effect refers to a material exhibiting the PTC effect, i.e., the positive temperature coefficient effect, where the resistance of the material increases with rising temperature. For example, most metallic materials exhibit the PTC effect. In these materials, the PTC effect manifests as a linear increase in resistance with temperature, which is commonly referred to as the linear PTC effect. Nonlinear PTC effect: Materials undergoing a phase transition exhibit a phenomenon where resistance increases sharply by several to more than ten orders of magnitude over a narrow temperature range, known as the nonlinear PTC effect. Many types of conductive polymers exhibit this effect, such as polymer PTC thermistors. These conductive polymers are very useful for manufacturing overcurrent protection devices. Polymer PTC thermistors are used for overcurrent protection and are often referred to as resettable fuses (hereinafter referred to as thermistors). Due to their unique positive temperature coefficient resistance characteristics, they are highly suitable as overcurrent protection devices. Thermistors are used in series in circuits, similar to conventional fuses. During normal circuit operation, the thermistor temperature is close to room temperature and its resistance is very low, so it does not impede current flow when connected in series. However, when an overcurrent occurs due to a fault, the increased heat generation causes the thermistor's temperature to rise. When the temperature exceeds the switching temperature, the resistance increases dramatically, rapidly reducing the circuit current to a safe value. After the thermistor trips, the current in the circuit is significantly reduced; t is the tripping time of the thermistor. Due to the good design flexibility of polymer PTC thermistors, their temperature sensitivity can be adjusted by changing their switching temperature (ts), allowing them to provide both overtemperature and overcurrent protection. They are suitable for overcurrent and overtemperature protection of lithium-ion and nickel-metal hydride batteries. Influence of ambient temperature on polymer PTC thermistors: Polymer PTC thermistors are direct-heating, step-type thermistors. Their resistance change process is related to their own heat generation and dissipation conditions; therefore, their holding current, tripping current, and tripping time are influenced by ambient temperature.

issendorff electrical component classification

Terminal blocks can be divided into European-style terminal block series, plug-in terminal block series, transformer terminal blocks, building wiring terminals, fence-style terminal block series, spring-style terminal block series, DIN rail-mounted terminal block series, wall-through terminal block series, optocoupler terminal block series, various ring terminals, tubular terminals, terminal blocks, copper strips, iron strips, etc. Modes of use include plug-in, fence-style, spring-style, DIN rail-mounted, wall-through, and fuse terminals.

issendorff electrical component characteristics

Under normal circumstances, the actual static characteristic output of a sensor is a curve rather than a straight line. In practical work, to enable instruments to have uniformly scaled readings, a fitted straight line is often used to approximately represent the actual characteristic curve. Linearity (non-linear error) is a performance indicator of this degree of approximation. There are various methods for selecting the fitted straight line. For example, the theoretical straight line connecting the zero-input and full-scale output points can be used as the fitted straight line; or the theoretical straight line that minimizes the sum of squared deviations from each point on the characteristic curve can be used as the fitted straight line, which is called the least squares fitted straight line.

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