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105PHB400K2H Film Capacitors: Application Field and Working Principle

105PHB400K2H film capacitors are a type of metalized polypropylene film capacitor. Manufactured by leading brand Yageo, this type of capacitor is primarily used for higher voltage AC Filter applications. The capacitors are characterized by their strong electrical insulation properties, self-healing ability and good insulation resistance.

Design

105PHB400K2H film capacitors are built with three parts: an outer housing, an inner metalized polypropylene film and two metalized plates for contacts. The capacitor also features four heat-resistant self-healing diodes that provide the self-healing function and enhanced dielectric absorption.

Application

The 105PHB400K2H film capacitors are used mainly in AC motor starting circuits, LED fluorescent light power supplies, inductive load applications, power supplies and inverters. The capacitors are also suitable for use as pre-charging capacitors in DC-DC converters, low voltage filter capacitors and various other applications.

Working Principle

105PHB400K2H film capacitors function like other types of capacitors, using the principle of electric fields to store and release electrical energy. When electric current flows into one of the plates (the anode), an electric field is created between the two plates, which attracts and stores opposite charges from the other plate (the cathode). When the current is stopped, the electric field is reversed, causing the stored energy to be released.

The self-healing function of the 105PHB400K2H film capacitors helps to prevent damage caused by arcing, by dissipating excess energy in the form of heat. Once the electric field is reversed, the diodes draw the excess energy away from the capacitor, preventing internal damage.

Conclusion

105PHB400K2H film capacitors are a popular choice for AC Filter applications, due to their strong electrical insulation properties, self-healing function and good insulation resistance. The capacitors are versatile and suitable for use in a variety of applications, including switching power supplies, DC converters, and LED light power supplies. The capacitors work by using the principle of electric fields to store and release electrical energy, with the self-healing diodes preventing damage caused by arcing.

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