Comparison of the characteristics of aluminum electrolytic capacitors and tantalum electrolytic capacitors
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- Time of issue:2020-06-22 10:02
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(Summary description)Aluminum electrolytic capacitors have a relatively large body, a large series resistance, a large inductance, and are sensitive to temperature. It is suitable for occasions where the temperature does not change much and the operating frequency is not high (not higher than 25kHz). It can be used for low frequency filtering (the parallel filtering effect of electrolytic capacitors at low frequencies is low frequency difference) Aluminum electrolytic capacitors have polarity, and the correct polarity must be ensured during installation, otherwise there is a danger of explosion.
Comparison of the characteristics of aluminum electrolytic capacitors and tantalum electrolytic capacitors
(Summary description)Aluminum electrolytic capacitors have a relatively large body, a large series resistance, a large inductance, and are sensitive to temperature. It is suitable for occasions where the temperature does not change much and the operating frequency is not high (not higher than 25kHz). It can be used for low frequency filtering (the parallel filtering effect of electrolytic capacitors at low frequencies is low frequency difference) Aluminum electrolytic capacitors have polarity, and the correct polarity must be ensured during installation, otherwise there is a danger of explosion.
- Categories:Industry News
- Author:
- Origin:
- Time of issue:2020-06-22 10:02
- Views:
Compared with aluminum electrolytic capacitors, tantalum electrolytic capacitors have obvious advantages in series resistance, inductance, and stability to temperature. However, its operating voltage is lower.
1.3 times of 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, it is the rated operating voltage +50V as the surge voltage. This is the voltage guaranteed by the manufacturer and can be allowed to withstand this in a short time. Voltage. When the capacitor is at a surge voltage, the current will be very large, usually 10 to 15 times the normal condition. If the time is too long, it will burst. Therefore, the general selection of aluminum capacitors should select a slightly higher voltage, the actual working voltage is preferably 70~80% of the nominal voltage.
Design experience of electrolytic capacitors:
1. The electrolytic capacitor in the filter circuit takes a voltage value of 1.2-1.5 times the peak value of the noise according to the specific situation, and does not depend on the rating value of the filter circuit;
2. There should be no pads and vias directly under the electrolytic capacitor. A
3. The electrolytic capacitor must not be in direct contact with the surrounding heating elements. A
The applicable guidelines for aluminum electrolytic capacitors are as follows:
4. Aluminum electrolytic capacitors are divided into positive and negative poles. No reverse voltage and AC voltage should be added. Non-polarized capacitors should be used where reverse voltage may occur. A
5. For places that require fast charging and discharging, aluminum electrolytic capacitors should not be used, and specially designed capacitors with long life should be selected. A
6. Should not use overload voltage
A. The sewing voltage after the DC voltage Yu Wenbo voltage is superimposed is lower than the rated value. A
B. When two or more electrolytic capacitors are connected in series, consider using balanced resistors so that the voltage on each capacitor is within its rated range. A
7. When designing the circuit board, it should be noted that there should not be any wiring on the upper end of the capacitor explosion-proof valve, and a gap of more than 2mm should be left. A
8. Electrolysis is also mainly chemical solvents and electrolytic paper is flammable, and the electrolyte is conductive. When the electrolyte contacts the pc board, it may corrode the circuit on the pc board. , Causing smoke or fire. Therefore, there should be no wiring below the electrolytic capacitor. A
9. When designing the circuit board to the back, make sure that the heating element is not close to the aluminum electrolytic capacitor or the electrolytic capacitor.
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