Film capacitor is a type of organic dielectric capacitor. Film capacitor is an excellent capacitor because it has many excellent characteristics. Its main characteristics are as follows: no polarity, high insulation impedance, wide frequency response, and little dielectric loss. Based on the above advantages, film capacitors are widely used in analog circuits Film capacitors are mainly used in electronics, household appliances, communications, electric power, electrified railway, hybrid electric vehicles, power generation, solar power generation and other industries.