Jul. 12, 2021
Film capacitors are capacitors in which metal foil is used as electrodes, and plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate are covered from both ends and then wound into a cylindrical structure. Based on the type of plastic film, film capacitors can be divided in to polyethylene capacitors (also known as Mylar capacitors), polypropylene capacitors (also known as PP capacitors), polystyrene capacitors (also known as PS capacitors) and polycarbonate capacitors.
Film capacitors have many functions, one of which is suppressing interference in power supply and battery circuits. In the circuit, generally X2 and Y1 safety capacitors are used more. The second is the resonant circuit. In an AC circuit with capacitor C, resistor R, and inductor L, the voltage at both ends of the circuit and the phase of the current in it are generally different.
If we adjust the power supply frequency or the parameters of the circuit components (L or C), we can make them the same phase, and the entire circuit appears purely resistive. The circuit reaching this state is called resonance. In the resonance state, the total impedance of the circuit reaches the extreme value or approximately reaches the extreme value. The role of the resistance-capacitance step-down circuit should not be underestimated. This circuit is currently widely used in the LED lighting industry. In the resistance-capacitance step-down scheme, the film capacitor becomes the main key component. The length of use time and performance directly affect the life of the LED lamp.
Film capacitors have many functions, and you must understand its withstand voltage and capacitance before purchasing. To purchase film capacitors, you should choose a regular manufacturer. A good manufacturer can reduce unnecessary troubles. Dongguan Zhixu Electronic Co., Ltd. (also JYH HSU(JEC)) has passed ISO9001:2015 quality management system certification. Its safety capacitors (X and Y series) and varistors have passed authoritative certifications of many countries and its ceramic capacitors and film capacitors are in line with environmental protection directives.
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Jul. 12, 2021
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Jul. 12, 2021
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