Passive components for electronic circuits—polypropylene film capacitors 2

3、 Working principle

The working principle of polypropylene film capacitors is based on their ability to store charges. When voltage is applied to both ends of a capacitor, opposite charges accumulate on the electrodes, and the polypropylene dielectric prevents the charges from flowing directly, thereby storing energy.

4、 Identification method

The identification of polypropylene film capacitors usually includes capacitance value, withstand voltage value, tolerance, production date, and manufacturer identification. The capacitance value is generally represented by a combination of letters and numbers, such as "104" representing (10 times 10 ^ 4) pF, which is 0.1 μ F. diode

5、 Installation

When installing polypropylene film capacitors, the following points should be noted to ensure stable and reliable performance:

1. Correct polarity: Although most polypropylene film capacitors are non-polar, correct polarity installation is necessary in special types such as metalized polypropylene film capacitors. Ensure proper connection according to the manufacturer's instructions.

2. Avoid high temperatures: During installation, ensure that capacitors are kept away from heat sources such as resistors, transformers, etc., and avoid prolonged exposure to high temperatures, which may affect their performance and lifespan.

3. Mechanical stress: Avoid applying excessive mechanical stress to capacitors during installation, such as bending or compressing pins, as this may cause damage to the internal structure.

4. Prevent moisture: The installation environment should be kept dry to avoid a decrease in the insulation performance of capacitors caused by excessive humidity. When used in high humidity environments, special packaged capacitors can be selected to improve their moisture resistance.

5. Appropriate spacing: When installing on the circuit board, sufficient space should be ensured between capacitors to avoid interference and overheating between them.diode