Film capacitors and power capacitors are two different types of capacitors, which have some differences in structure, application range and performance. The following are the main differences between film capacitors and power capacitors:
1. Structure and manufacturing method:
Film capacitors: Film capacitors are composed of one or more layers of metal film and insulating dielectric film. The film can be a metal film (such as aluminum, zinc, tantalum, etc.) or a conductive polymer film (such as polyaniline). Film capacitors are made by stacking and combining thin films and encapsulating them in insulating materials.

Power capacitors: Power capacitors are usually composed of metal foils (such as aluminum foil) and dielectric layers (such as polypropylene film) stacked alternately. The metal foil and the dielectric layer form a capacitor structure through an electrolyte or coating. The structure of power capacitors is more complex and larger in size.

2. Capacitance range and application:
Film capacitors: The capacity range of film capacitors is usually small, generally between a few picofarads (pF) and a few hundred microfarads (μF). Film capacitors are often used in electronic equipment, such as electronic circuits, communication equipment, etc.
Power capacitors: The capacity range of power capacitors is usually large, ranging from a few microfarads (μF) to thousands of farads (F). Power capacitors are used in power systems, mainly for power factor correction, harmonic filtering and energy storage.
3. Working voltage and current capacity:
Film capacitors: Film capacitors are usually suitable for low to medium working voltage ranges, generally between a few volts and hundreds of volts. Its current capacity is small.
Power capacitors: Power capacitors can withstand higher working voltages, usually between hundreds of volts and thousands of volts. Its current capacity is large and can handle higher electrical power.
4. Temperature characteristics:
Film capacitors: Film capacitors usually have good temperature stability, and their capacitance values change less within a certain temperature range.
Power capacitors: The temperature characteristics of power capacitors are relatively general, and their capacitance values may fluctuate to a certain extent when the temperature changes.
5. Cost:
Film capacitors: Due to their relatively simple structure and relatively small capacity range, film capacitors have a low manufacturing cost.
Power capacitors: The manufacturing cost of power capacitors is relatively high due to their large capacity and complex structure.
Film capacitors or power capacitors need to be selected based on specific application needs and performance requirements. Film capacitors are suitable for low-power electronic devices, while power capacitors are mainly used in high-power power systems.