Application and related requirements of metallized film capacitors | Focus on mid-to-high-end brand capacitor manufacturers

Metal film capacitors have excellent electrical characteristics, high stability and long life, and can meet a variety of different applications. At present, capacitor manufacturers have been continuously improving metal film capacitors to provide larger capacitors in a smaller package size. Capacitor manufacturers can optimize the characteristics of metal film capacitors by selecting appropriate dielectrics according to specific applications. For example, metal film capacitors show good characteristics in common applications, with high dielectric constant (making it the highest capacitance per unit volume in metal film capacitors), high insulation strength, self-healing characteristics and good temperature stability . Among all types of film capacitors, polyester capacitors achieve the best volumetric efficiency at a moderate cost, and are the most popular choice for DC applications such as decoupling, blocking, bypassing, and noise suppression. The capacitor made of metalized polypropylene film has low dielectric loss, high insulation resistance, low dielectric absorption and high dielectric strength. It is a long-lasting and space-saving solution, and its long-term stability is also very good. Great. These features make metalized polypropylene film capacitors an important choice for applications such as AC input filters, electronic ballasts, and buffer circuits. Polypropylene film capacitors can provide rated voltages of 400VAC or higher to meet the requirements of industrial three-phase applications and professional equipment. They can also be used in switching power supplies, frequency discrimination and filter circuits, as well as energy storage and sample and hold applications. In addition, AC and pulse capacitors can be optimized for applications with steep pulses, such as electronic ballasts, motor controllers, switched mode power supplies (SMPS), CRT televisions, and monitors or buffers. In these applications, a bimetallized polypropylene film structure with a low-loss dielectric is generally used, which can withstand high voltage and high pulse load applications under high frequency conditions.　　The principle of choosing film capacitors for product design is usually relatively simple. For example, the EMI filter in the power line power supply product adopts a common topology, and it is easy to select the capacitance value. There is no theoretical upper limit for the X capacitor placed between the main and neutral phases, but it is usually between 0.1 microfarad and 1.0 microfarad. The Y capacitor placed between the main or neutral line and the chassis ground needs to choose the smallest possible capacitance to minimize the leakage current flowing to the ground. For most designs, 4700pf is the most ideal. These devices must meet the safety and performance standards applicable to components connected to the mains, including UL94V-0, European ENEC standards and EN132400.　　 Generally, people need to select the appropriate capacitor technology and ensure that the package size and type meet the needs of the application.　　 Capacitance stability includes sufficient self-healing capacitance, which is a key performance criterion. After these requirements are met, special requirements, supply and logistics issues will become the main issues that need to be considered.

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