Regarding electrolytic capacitors, I believe you don't know much about it, except that what you have talked about before is only the core material of the product, the electrolyte. So today I want to talk to you about other technical characteristics of electrolytic capacitors, such as temperature, pressure, and standard requirements for capacitance, etc., so that you can have a clear understanding of electrolytic capacitors, so let’s not say much. Let me talk about these in detail.

First of all, I believe you have guessed it, and that is temperature. Basically, all component products cannot avoid the influence of temperature, so the temperature range that can be adapted has also become an important factor in distinguishing between various capacitors. The acceptable temperature range for electrolytic capacitors is between -50 and 100 degrees Celsius, and the voltage threshold that can withstand is about 2UF. The pressure refers to the pressure range that the device and the product can bear together after the electrolytic capacitor is installed. The general threshold is probably between 2KP-4KP. Be careful not to exceed this value, or the product will be damaged. Although the capacity is also a direct factor to directly judge the quality of the capacitor, there is a theoretical threshold for all products, and the capacity of the product must not exceed 20% of the rated value. And the range of change must be controlled within 5% to ensure the stability of the product. After all, only stability can make the product exert its full effect.

How to see the parameters of electrolytic capacitors?

An electrolytic capacitor is a type of capacitor. The positive electrode is a metal foil, and the metal oxide film next to the positive electrode is a dielectric. The cathode is composed of conductive materials, electrolytes and other materials. Electrolytic capacitor is one of the important components of switching power supply. Generally speaking, the equivalent circuit of an electrolytic capacitor is basically a series connection of an ideal capacitor, parasitic inductance and equivalent series resistance.

1. Nominal capacitance and allowable deviation

The nominal capacitance is the capacitance marked on the capacitor. The deviation between the actual amount of the capacitor and the nominal capacitance is called the error, and the accuracy is called the accuracy within the allowable deviation range.

2. Rated voltage

The maximum effective value of DC voltage continuously applied to the capacitor at the lowest temperature and rated temperature is mostly marked on the capacitor shell. If the working voltage exceeds the capacitor's withstand voltage, it will cause permanent damage.

3. Insulation resistance

The ratio of capacitor voltage to leakage current. It is related to the dielectric constant of the medium, the thickness of the medium, and the area of the medium.

4. Loss

The energy consumed by the capacitor due to heat is divided into two types, dielectric loss and metal loss, which are usually expressed by the loss tangent value.

5. Frequency characteristics

As the frequency increases, the capacitance of a general capacitor decreases.

With the miniaturization of electronic equipment, more electrolytic capacitors need to have better frequency characteristics, lower ESR, lower impedance, lower ESL, higher withstand voltage performance, and lead-free. In the future, electrolytic capacitors may be like this develop.