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What is aluminum electrolytic capacitor_the difference between aluminum electrolytic capacitor and t

HITS:90     DATE:2020-09-19 17:10:34    
With the development of social economy and the improvement of high-tech level, aluminum electrolytic capacitors and tantalum capacitors have become more and more popular in the daily lives of ordinary people, and they are inside the lighting fixtures. But in addition, many people don't understand their differences, and even confuse them. Aluminum electrolytic capacitors The aluminum electrolytic capacitor has a relatively large volume, a large series resistance, a large impedance angle, and is more sensitive to temperature. It is suitable for places where the temperature change is not large and the output power is not high (not higher than 25kHz). It can be filtered at low frequencies (in the case of high frequencies, the actual effect of series filtering of electrolytic capacitors is lower). Aluminum electrolytic capacitors are optically active, so you must ensure proper optical rotation during installation, otherwise there is a risk of explosion. Compared with aluminum electrolytic capacitors, tantalum electrolytic capacitors have significant advantages in terms of series resistance, impedance angle, and reliability to temperature. However, its operating voltage is relatively low. 1.3 times the rated current of the aluminum electrolytic capacitor is used as the pulse current of the power capacitor. When the working voltage is higher than 160V, the rated value of the working voltage is 50V as the pulse current. It is the working voltage guaranteed by the manufacturer and can be allowed in a short period of time. Undertake this working voltage. When the power capacitor is in the pulse current, the current will be very large, generally 10~15 times of all normal conditions, if the time is too long, it will burst. Therefore, in general, the working voltage of aluminum power capacitors should be selected slightly higher, and the specific working voltage is 70~80% of the nominal voltage. The difference between aluminum electrolytic capacitors and tantalum capacitors 1. The inside of the electrolytic capacitor is a paper-separated aluminum-platinum electric-grade rewinding machine, and the outside is covered with an aluminum shell filled with lithium battery electrolyte. Tantalum capacitors are based on tantalum (solid) as the key raw material, and there is no lithium battery electrolyte. 2. Under the premise of the same volume, the basic principle of the structure of the steel-making equipment determines that it has a larger volume and a small tantalum capacitor. 3. The ESR (equivalent circuit series resistance) of aluminum electrolytic capacitors is relatively large, and the ESR of tantalum capacitors is not large. 4. There is lithium battery electrolyte inside the aluminum electrolytic capacitor, which will swell when exposed to heat, and will explode if over temperature (the explosion-proof valve will open the explosion-proof valve and the liquid will leak), so the maximum temperature of the electrolytic capacitor is 105 degrees. , There is no liquid inside the tantalum capacitor, heat resistance, and no risk of liquid leakage. 5. The output power of electrolytic capacitors is very low, generally below 1KHZ, the main performance is better. After the frequency is high, the main performance is very high, while the high frequency characteristics of tantalum capacitors are better, and the frequency range covers the electrolytic capacitors. 6. Electrolytic capacitors can guarantee high voltage resistance. Common electrolytic capacitors (such as those used in switching power supply circuits) are above 400V, while tantalum capacitors are difficult to guarantee high voltage resistance. The general working voltage is around 10V, and the high voltage is 16V. Yes, no matter how high it is, it is very rare, especially the low and large space, and the compression resistance is lower. The largest 470UF I have seen is also 35V compression resistance, or customized by the military industry. 7. The raw materials and processing technology of electrolytic capacitors make it very susceptible to natural environmental temperature hazards, while the tantalum metal material of tantalum capacitors is very firm and stable. Sulfuric acid is recognized as an item with strong electrochemical corrosion and solubility. It can de-etch the foot, but sulfuric acid can basically not cause damage to tantalum. The melting point of tantalum is also very high. This type of reliability decision makes it very stable, and its main parameter characteristics are not easily affected by external temperature. 8. After the harmonic distortion current of the electrolytic capacitor exceeds the rated current, the greater risks are hot, explosion, and liquid leakage. After the harmonic distortion current of the tantalum capacitor exceeds the rated current, an explosion or fire will occur, and the tantalum capacitor is resistant to overcurrent. (Harmonic distortion current) The working ability is very poor, and it is easy to catch fire. It is the big disadvantage of tantalum capacitors. 9. Electrolytic capacitor processing technology is simple, the raw materials are very common, and the price is low. The raw material tantalum metal material of tantalum capacitor is a mineral resource that cannot be remanufactured. The composition of tantalum ore in the world is very limited, and because tantalum is heat-resistant, corrosion-resistant, and is produced It is also very difficult, so tantalum capacitors are more expensive. 10. There are many comparisons at other levels, and time is limited, and they are not listed one by one. As far as application is concerned, this difference is sufficient. Above is what aluminum electrolytic capacitors are_The difference between aluminum electrolytic capacitors and tantalum capacitors, I look forward to helping you all.



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