Dec. 15, 2021
Film capacitors are capacitors in which metal foil is used as an electrode, and plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate are overlapped from both ends and then wound into a cylindrical structure. Many people don't know how the loss of film capacitors is generated. This article will discuss on this topic.
Film capacitors are widely used because of their high insulation resistance, wide frequency response, and non-polarity. Therefore, film capacitors are often used in circuits such as integrated circuit boards, analog circuits, and so on. Especially in terms of signal cross-connection, the performance is superior. Compared with other media, the film capacitor has small dielectric loss and wide frequency response, which can ensure that the signal will not change during transmission.
The loss of film capacitors is generally divided into dielectric loss and metal loss. Dielectric loss is generally the loss caused by dielectric leakage current and dielectric polarization. Metal loss is generally the contact resistance between the plate and the pin, the contact plate resistance, and the pin resistance. In order to control the loss of the film capacitor, it is necessary to control the above factors, which mainly depends on the manufacturing process of the film capacitor.
Another possibility is that the contact resistance between the thin film electrode and the sprayed metal layer is too large. The main factors affecting this contact resistance are the process of spraying gold and the choice of spraying gold materials. Using DC voltage during the withstand voltage test will increase the contact resistance.
The loss of the film capacitor is generated in the way the above content mentioned, so it is very important to choose a regular manufacturer. Good film capacitor manufacturers can reduce unnecessary troubles. Dongguan Zhixu Electronic Co., Ltd. (also JYH HSU(JEC)) have complete models of guaranteed quality.
JEC has passed ISO9001:2015 quality management system certification; JEC safety capacitors (X capacitors and Y capacitors) and varistors have passed national certifications of the main industrial powers across the world; JEC ceramic capacitors, film capacitors and super capacitors are in compliance with environmental protection indicators.
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