What are the common nouns related to electrolytic capacitors?
1. Anode (anode): The anode aluminum layer, which is the positive electrode of the electrolytic capacitor.
2. Cathode: The electrolyte layer. 3. Dielectric di: A layer of aluminum oxide attached to the surface of the aluminum layer. 4. Cathode Foil: Connects the electrolyte to the outer layer. This layer does not require oxidation during fabrication, but in practice it is naturally oxidized due to the easy oxidation of aluminum during the etching process. Oxide layer, this oxide layer can withstand a voltage of 1~2v.
5. Spacer paper: Isolation of the cathode and anode so that they are not directly shorted and adsorb a certain amount of electrolyte.
Is the non-polar capacitor the same as the non-polar electrolytic capacitor?
Most types of capacitors are non-polar, only the electrolytic capacitors have polarity, and among the electrolytic capacitors, there are very special non-polar electrolytic capacitors. Compared with ordinary capacitors, electrolytic capacitors have large capacity, low price, and small size, which are unmatched by other capacitors. However, electrolytic capacitors generally have polarities, and their operational reliability, withstand voltage, temperature resistance, and dielectric loss are not as good. Other capacitors. The so-called non-polar electrolytic capacitors actually pack two identical electrolytic capacitors back to back together. This type of capacitance loss, low reliability, low withstand voltage can only be used in a few applications where the requirements are not high.
What happens when there is a polarity capacitor reversed?
If the capacitance is small, the withstand voltage is very high, and the working voltage is low, the reverse connection does not show 啥; if the capacity is slightly larger (100UF or more), the withstand voltage is close to the working voltage, the capacitance will not exceed 10 minutes, and the bad The form of expression is: first drum, then blow, then burst.
If there is a polarity capacitor, the reverse connection will explode. Does it mean that it cannot be directly connected to the AC power supply?
Can not be connected to the AC power supply, because this polar capacitor design is used on the DC power supply for filtering, because this polar capacitor has a special substance inside, this material can not withstand the back pressure, if it is connected to the AC power Will reverse breakdown or explosion.
Why is the polarity of the capacitor reversed?
The internal structure of the polar capacitor is divided into a positive electrode, a dielectric layer and a negative electrode. The dielectric layer has the property of unidirectional conduction. Of course, after the reverse connection, the dielectric layer of the product does not function as an insulator, and the capacitor is naturally short-circuited.
Why is the resistivity small when the positive and negative electrodes of the electrolytic capacitor are connected?
The principle of electrolytic capacitors is concerned: when the positive electrode is connected, the positive electrode of the capacitor will form a very thin oxide film (alumina) as a dielectric; when the metal foil (positive capacitor) is connected to the negative electrode of the power supply, the H2 will be electrolyzed without An oxide film is formed, and the other electrode does not form an oxide film which can serve as a dielectric depending on the material.
Why can only use non-polar capacitors in pure AC circuits?
In a circuit in which a DC voltage is superimposed on an AC signal, and it is ensured that the lowest voltage after superposition does not become a negative value, a polar capacitor can be used. In the case of the same capacity, the volume and cost of the capacitor with polarity are much smaller than those of the non-polar capacitor. Therefore, the capacitor volume is a big contradiction when a large capacitance is required, and a non-polar capacitor can be used. In the occasion, it is natural to replace it with a polar capacitor, which not only solves the volume problem, but also has a much lower cost. Large capacitors can filter out AC signals above the lower frequency, while small capacitors can only filter out signals above the higher frequencies.