Metal film capacitor
s 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 metallized 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 unit volume capacitance in metalized film capacitors), high insulation strength, self-healing characteristics and good temperature stability Sex. 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 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. For most designs, 4700pf is the most ideal. These devices must meet the safety and performance standards applicable to the components connected to the mains. 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. Miniaturization of capacitor products-including obtaining higher capacitance, retention voltage, insulation and isolation characteristics, and other key electrical parameters in a smaller package, allowing engineers to design In terms of flexibility. As the package size shrinks, the lead-free trend has become the focus of attention. Appropriate devices are emerging, enabling new products to meet upcoming specifications. For example, the 339X2 series of new compact, lead-free EMI suppression metal film capacitors meets these requirements. The capacitance value ranges from 1.0nF to 4.7uF, the package size is smaller, and the pitch is reduced to 7.5mm. In addition, the height and thickness of 339X2 capacitors below 100nF are 1-2mm lower than the former. Usually, engineers need to quickly complete the design of EMI filters, ballasts, buffers and power supplies, and rarely have relations with capacitor manufacturers. In general, for high value-added products, designers need to devote themselves to perfecting the distinctive features of the product, including special molds, capabilities, stylish appearance, or long battery life. Sometimes product designers and capacitor manufacturers need to customize solutions to meet special challenges, such as application requirements, meeting special market requirements, or passing specific tests, and so on. These may include: providing specific capacitance values u200bu200bin other package sizes, shrinking packages for space-constrained applications (such as filtering of automotive AC power supplies), or using integrated passive device (IPD) technology to incorporate filters or system functional modules. If the expected output is large enough to make this technology feasible, IPD can save space and unit product cost. The development trend of metallized film capacitors to surface mount has been established, and X and Y type voltage suppression devices may adopt this technology in the future.
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