Application characteristics of different material film capacitors

Film capacitors have excellent electrical properties, high stability and long life, and can be used in a variety of applications. Capacitor manufacturers are continually improving this product to provide greater capacitance in smaller package sizes. The editor wants to talk about the application and characteristics of the two material film capacitors, let's take a look!

Thin film capacitors with low dielectric loss, high dielectric resistance, low dielectric absorption and good dielectric strength are a long-lasting and space-saving solution with long-term stability. These characteristics make polypropylene film capacitors an important choice for applications such as AC input filters, electronic ballasts, and snubber circuits. Polypropylene film capacitors are available in rated voltages of 400VAC or higher to meet the requirements of industrial three-phase applications and specialized equipment. They can also be used in switching power supplies, qualification and filter circuits, and energy storage applications.

Polyester film capacitors exhibit good characteristics in common applications, have high dielectric constants (making them high capacitance per unit volume in film capacitors), high dielectric strength, self-healing characteristics, and good temperature stability characteristics. In all types of film capacitors, polyester film capacitors achieve volumetric efficiency at moderate cost and are a popular choice for DC applications such as decoupling, blocking, bypassing and noise suppression. In addition, AC and pulse capacitors can be optimized for applications where steep pulses are present, such as electronic ballasts, motor controller switching power supplies (SMPS), CRT televisions and displays or buffers. These applications typically employ a polypropylene film structure with a low loss dielectric that can withstand high voltage and high pulse load applications at high frequencies.