Capacitors made of metal films have 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. These features make metalized polypropylene film capacitor
s 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. 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 this product to provide greater capacitance in a smaller package size. Capacitor manufacturers can optimize the characteristics of metal film capacitors by selecting the appropriate dielectric according to the specific application. For example, polyester film shows 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. In addition, AC and pulse capacitors can be optimized for applications with steep pulses, such as electronic ballasts, motor controller 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 selecting metal film capacitors when designing products 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 select the smallest possible capacitance to minimize the leakage current to the ground.
In an age when electrolytic capacitor is increasingly important, the researchers believe manufacturers should pay close attention to their results.
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electrolytic capacitor offers the opportunity for improved manufacturing and product’s data collection, as well as direct feedback, enabling companies to better understand their consumer base and respond accordingly.