Aluminum electrolytic capacitors have large volume, large series resistance, large inductive reactance, and sensitivity to temperature. It is suitable for occasions with little change in temperature and low operating frequency (not higher than 25kHz). It can be used for low-frequency filtering (low frequency deviation of parallel filtering of electrolytic capacitors at high frequencies). Aluminum electrolytic capacitors have polarity. The correct polarity must be ensured during installation, otherwise there is a danger of explosion.

Compared with aluminum electrolytic capacitors, tantalum electrolytic capacitors have obvious advantages in series resistance, inductive reactance, and temperature stability. But its operating voltage is lower.

1.3 times the rated voltage of the aluminum electrolytic capacitor is used as the surge voltage of the capacitor. When the operating voltage is higher than 160V, the rated working voltage is +50V as the surge voltage. This is the voltage guaranteed by the manufacturer and can be tolerated in a short time. Voltage. When the capacitor is in a surge voltage, the current will be very large, usually 10 to 15 times that of normal conditions. If it is too long, it will burst open. Therefore, the general selection of aluminum capacitors should be selected slightly higher voltage, the actual working voltage is 70~80% of the nominal voltage is appropriate.

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