1. Rated voltage, peak voltage

The voltage waveform applied to the DC capacitor has a DC part and an AC part. The sum of the maximum voltage of the DC part and the peak voltage of the AC part should not exceed the rated DC voltage value during use.

2. Frequency

Capacitors are affected by frequency, especially the relationship between the capacitor's allowable current and frequency. Because when the frequency continues to increase, the effective cross-sectional area of the electrode and wire decreases inversely proportional to the square root of the frequency, that is, skin effect occurs, and the metal resistance of the capacitor is greatly increased, that is, the equivalent series resistance increases, which often results in internal Excessive heat causes failure.

3. Capacity

 When the capacitance is particularly large or the voltage is particularly high, several capacitors are often used in parallel or in series. At this time, it is necessary to pay attention to the wiring between the capacitors to be as short as possible to reduce the inherent inductance.

Fourth, the ambient temperature

The higher the operating environment temperature of the capacitor, the higher the failure rate, and the shorter the service life. Especially when the temperature exceeds the upper limit category, due to accelerated aging of the medium, product heat and sealing damage, etc., will accelerate the failure of the capacitor.

5. Humid environment and changes in air pressure

When the capacitor is used in a situation where the air pressure changes rapidly, or the capacitor is in a humid environment for a long time, the package casing should be quite strong, and no moisture can enter the insulating medium to deteriorate the performance of the capacitor.

6. Rated current, peak current

The rated current and peak current directly affect the professional design of the capacitor.