The polar capacitor has the same principle as the non-polar capacitor. It stores charge and discharges the charge. The voltage on the plate (here, the electromotive force of charge accumulation is called the voltage) cannot be mutated. The difference lies in the difference in the medium, the performance, the capacity, and the structure that lead to different usage environments and uses. On the other hand, according to the needs of production practice, people have experimented with the manufacture of capacitors with various functions to meet the normal operation of various electrical appliances and the operation of new equipment. With the development of science and technology and the discovery of new materials, better and more diverse capacitors will continue to emerge. A, different media What is the medium? To put it bluntly, it is the material between the two plates of the capacitor. Most of the polar capacitors use electrolytes as the dielectric material, and usually have the same capacitance as the polar capacitor. In addition, different electrolyte materials and processes produce polar capacitors with the same volume capacity. There is also a close relationship between pressure resistance and the use of dielectric materials. Non-polar capacitor dielectric materials are also many, mostly metal oxide film, polyester and so on. Due to the reversible or irreversible properties of the medium, the use environment of polar and non-polarized capacitors is determined. Second, the performance is different Performance is the requirement of use, and the maximization of demand is the requirement of use. If the power section of the TV is filtered with a metal oxide film capacitor, the capacitance and withstand voltage of the filter are required. I am afraid the chassis can only install a power supply. Therefore, only polar capacitors can be used as filters, and polar capacitors are irreversible. That is, the positive electrode must be connected to the high potential terminal, and the negative electrode must be connected to the low potential terminal. General electrolytic capacitor above 1 microfarad, do coupling, decoupling, power supply filtering and so on. Non-polarity capacitors are mostly below 1 microfarad and participate in resonance, coupling, frequency selection, current limiting, and so on. Of course, there are also large-capacity and high-voltage proofing devices, which are mostly used for reactive power compensation, motor phase-shifting, and variable-frequency power supply shifting. There are many types of non-polarity capacitors, which are not repeated one by one. Third, the capacity is different It has already been said that the same volume of capacitor media varies in capacity and is not repeated one by one. Fourth, the structure is different In principle, regardless of the discharge of the tip, what shape of the capacitor is required to use the environment can be. The commonly used electrolytic capacitors (with polar capacitors) are round and rarely used. Non-polarity capacitor shapes vary. Like tube shape, deformed rectangle, piece shape, square shape, round shape, combination square shape and round shape, etc., see where it is used. Of course, there are intangible ones. Here, invisible refers to the distributed capacitance. For distributed capacitors in high-frequency and intermediate-frequency devices must not be ignored. Fifth, the use of the environment and use In the maintenance, the above may be encountered. In order to understand the profound things in a simple way, you must try to figure it out on your own. This is just a guide, please correct me. Because of the relationship between its internal materials and structure, the capacity of a polar capacitor (such as aluminum electrolytic) can be very large, but its high-frequency characteristics are not good, so it is suitable for power filtering and other occasions, but there are good high-frequency characteristics Polarity capacitor - tantalum electrolysis, it is relatively high price; The nonpolar capacitor has a small size, low price, and high frequency characteristics, but it is not suitable for large capacity. Like ceramic capacitors, monolithic capacitors, and polyethylene (CBB) capacitors, ceramic capacitors are generally used in high-frequency filtering and oscillating circuits. The magnetic capacitor is a capacitor whose ceramic material is a meson and burns a silver layer on the surface as an electrode. Magnetic capacitor has stable performance. Loss, leakage is very small, suitable for high frequency and high voltage circuit applications. In general, the insulating material between the two electrodes of the capacitor and the large dielectric constant (such as ferroelectric ceramics and electrolyte) are suitable for making large-capacity and small-sized capacitors, but the loss is also large. Low dielectric constant (such as ceramic) loss, suitable for high frequency applications.
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