GROMELLE electrical components Germany GROMELLE model GROMELLE price

GROMELLE electrical component is a photodetector that converts light into current or voltage signals depending on the mode of use. The die typically uses a photosensitive PN junction, which is highly sensitive to changes in light, exhibits unidirectional conductivity, and changes its electrical characteristics with varying light intensity; therefore, the current in the circuit can be varied by adjusting the light intensity. Photodiodes are also called photoelectric diodes. Photodiodes are similar in structure to semiconductor diodes; their die is a photosensitive PN junction with unidirectional conductivity, so a reverse voltage must be applied during operation. In the absence of light, there is a very small saturated reverse leakage current, known as 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 generates electron-hole pairs in the PN junction, increasing the density of minority carriers. These carriers drift under the reverse voltage, causing the reverse current to increase. Therefore, the current in the circuit can be varied by adjusting the light intensity.

GROMELLE electrical component function

In DC circuits, capacitors act as open circuits. A capacitor is a component capable of storing electric charge and is one of the most commonly used electronic components. Starting with the structure of a capacitor: the simplest capacitor consists of two end plates and an insulating dielectric in between (including air). When energized, the plates become charged, creating a voltage (potential difference); however, due to the insulating material in between, the entire capacitor does not conduct electricity. However, this situation holds only under the premise that the capacitor's critical voltage (breakdown voltage) is not exceeded. We know that any material is relatively insulating; when the voltage across a material increases to a certain level, the material can conduct electricity. We call this voltage the breakdown voltage. Capacitors are no exception; once a capacitor breaks down, it is no longer an insulator. However, at the secondary school level, such voltages are not encountered in circuits, so capacitors operate below the breakdown voltage and can be regarded as insulators. However, in AC circuits, the direction of current changes over time according to a specific functional relationship. The charging and discharging process of a capacitor takes time; during this period, a changing electric field forms between the plates, and this electric field is also a function that varies with time. In fact, current passes through the capacitor in the form of an electric field.

GROMELLE electrical component principle

In power generation, transformation, transmission, distribution, and consumption lines, current magnitudes vary widely, ranging from a few amperes to tens of thousands of amperes. To facilitate measurement, protection, and control, it is necessary to convert these to a more uniform current. Additionally, voltages on lines are generally high, making direct measurement very dangerous. Current transformers serve the functions of current transformation and electrical isolation. For pointer-type ammeters, the secondary current of current transformers is mostly at the ampere level. For digital instruments, the sampled signal is generally at the milliampere level. The secondary current of miniature current transformers is at the milliampere level, primarily serving as a bridge between large transformers and sampling. Miniature current transformers are also referred to as 'instrument current transformers.' ('Instrument current transformer' implies precision current transformers with multiple current ratios used in laboratories, generally for extending instrument ranges.) Current transformers operate on the principle of electromagnetic induction, similar to transformers; transformers transform voltage, whereas current transformers transform current. The winding of the current transformer connected to the measured current is called the primary winding; the winding connected to the measuring instrument is called the secondary winding. The ratio of the primary winding current I1 to the secondary winding I12 current of the current transformer is called the actual current ratio K. The current ratio of the current transformer when operating at rated current is called the rated current ratio of the current transformer, denoted by Kn.

GROMELLE electrical component principle

Like ordinary diodes, light-emitting diodes consist of a PN junction and also exhibit unidirectional conductivity. When a forward voltage is applied to a light-emitting diode, 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 diodes emit red, green, or yellow light. The reverse breakdown voltage of a light-emitting diode is greater than 14 volts. Its forward V-I characteristic curve is very steep, so a current-limiting resistor must be connected in series to control the current through the diode. The core part of a light-emitting diode is a chip composed of P-type semiconductor and N-type semiconductor. Between the P-type semiconductor and the N-type semiconductor, there 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), and current flows from the LED anode to the cathode, the semiconductor crystal emits light of various colors from ultraviolet to infrared; the light intensity is related to the current.

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