brother electrical components Germany brother model brother price

brother electrical components are instruments used to transform voltage. However, the purpose of a transformer in transforming voltage is to facilitate the transmission of electrical energy, so its capacity is large, generally calculated in kilovolt-amperes or megavolt-amperes; whereas the purpose of a voltage transformer in transforming voltage is mainly to supply power to measuring instruments and relay protection devices, to measure the voltage, power, and electrical energy of the line, or to protect valuable equipment, motors, and transformers in the line when a fault occurs. Therefore, the capacity of a voltage transformer is very small, generally only a few volt-amperes or tens of volt-amperes, with a maximum not exceeding one thousand volt-amperes.

brother electrical component parameters

1. Stable voltage refers to the stable voltage value generated across the terminals when the Zener diode passes the rated current. This value changes slightly with different operating currents and temperatures. Due to differences in manufacturing processes, the stabilization voltage of Zener diodes of the same model is not completely consistent. 2. Reverse leakage current refers to the current value passing through the Zener diode when it generates a stable voltage. Below this value, although the Zener diode can still stabilize voltage, the stabilization effect will deteriorate; above this value, as long as the rated power loss is not exceeded, it is allowed, and the stabilization performance will be better, but it will consume more electrical energy. 3. Dynamic resistance refers to the ratio of the change in voltage across the Zener diode to the change in current. This ratio changes with different operating currents; generally, the larger the operating current, the smaller the dynamic resistance. 4. Rated power consumption is determined by the allowable temperature rise of the chip, and its value is the product of the stable voltage and the maximum allowable current. 5. The temperature coefficient means that if the temperature of the Zener diode changes, its stable voltage will also undergo slight changes. The relative change in voltage across the tube caused by a temperature change of 1℃ is the temperature coefficient (unit: %/℃). Generally speaking, a stabilization voltage below 6V belongs to Zener breakdown, and the temperature coefficient is negative; the temperature coefficient is positive. When the temperature rises, the depletion layer decreases. In the depletion layer, the valence electrons of atoms rise to higher energy levels, and a smaller electric field strength can excite valence electrons from atoms to produce Zener breakdown, so its temperature coefficient is negative. Avalanche breakdown occurs when the depletion layer is wider and the electric field strength is lower. An increase in temperature increases the vibration amplitude of lattice atoms, hindering the movement of carriers. In this case, only by increasing the reverse voltage can avalanche breakdown occur, so the voltage temperature coefficient of avalanche breakdown is positive. For occasions with high requirements for power supply, two Zener diodes with opposite temperature coefficients can be connected in series for compensation. Due to mutual compensation, the temperature coefficient is greatly reduced. 7. Reverse leakage current refers to the leakage current generated by the Zener diode under the specified reverse voltage.

brother electrical component principle

A crystal diode is a p-n junction formed by p-type semiconductor and n-type semiconductor. A space charge layer is formed on both sides of its interface, and a built-in electric field is established. When there is no external voltage, it is in an electrical equilibrium state because the diffusion current caused by the carrier concentration difference on both sides of the p-n junction is equal to the drift current caused by the built-in electric field. When there is a forward voltage bias from the outside, the mutual cancellation effect of the external electric field and the built-in electric field increases the diffusion current of carriers, causing a forward current. When there is a reverse voltage bias from the outside, the external electric field and the built-in electric field are further strengthened, forming a reverse saturation current within a certain range of reverse voltage that is independent of the reverse bias voltage value. When the applied reverse voltage reaches a certain level, the electric field strength in the space charge layer of the p-n junction reaches a critical value, producing a carrier multiplication process. This generates a large number of electron-hole pairs, resulting in a large reverse breakdown current, known as the diode breakdown phenomenon.

brother electrical component applications

The wire and cable products adopted in power systems mainly include overhead bare wires, busbars (busbars), power cables (plastic cables, oil-paper power cables (basically replaced by plastic power cables), rubber-sheathed cables, overhead insulated cables), branch cables (replacing some busbars), magnet wires, and electrical equipment wires and cables for power equipment. The wire and cable products used for information transmission systems mainly include telephone cables, television cables, electronic cables, RF cables, fiber optic cables, data cables, magnet wires, power communication cables, or other composite cables. Except for overhead bare wires, almost all other products in this part have applications, but mainly power cables, magnet wires, data cables, and instrument cables.

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