Reasons for the Failure of Filter Film Capacitors

Film capacitors are excellent capacitors due to their many excellent properties. It has high insulation resistance, excellent frequency characteristics (broad frequency response), and low dielectric loss. Based on the above advantages, film capacitors are widely used in analog circuits. Film capacitors have the function of filtering, so what are filtering film capacitors?

The filter film capacitor is a kind of energy storage device installed at both ends of the rectifier circuit to reduce the AC pulsation ripple coefficient and improve the smooth DC output. The filter circuit requires a large capacity of the energy storage capacitor. 

In all circuits that need to convert alternating current into direct current, setting filter film capacitors will make the working performance of the electronic circuit more stable, and also reduce the interference of the alternating ripple on the electronic circuit. It is found that the filter film capacitor fails during use, which is likely to be due to these reasons:

1) The product quality of the filter film capacitor itself, such as unqualified manufacturing process and materials, the marked capacitance does not match the actual capacitance, and the aging caused by long use time will cause burnout.

2) The influence of the external environment, such as installation in a place with poor heat dissipation or close to a heat source, poor connection of capacitors, poor contact, etc., can also easily cause burnout.

3) Harmonic problem, harmonics make the filter film capacitor resonate, causing the capacitor to overcurrent and burn out.

There are other special reasons. It is necessary to analyze and judge the site where the filter film capacitor is burned out, and gradually investigate the cause of the failure. Sometimes small details may also be the cause of the burnout.

When choosing a film capacitor, you need to find a reliable manufacturer. JYH HSU (or Dongguan Zhixu Electronics) not only has full models of ceramic capacitors with guaranteed quality, but also offers worry-free after-sales. JEC factories has passed ISO9001:2015 quality management system certification; JEC safety capacitors (X capacitors and Y capacitors) and varistors have passed the certification of various countries; JEC ceramic capacitors, film capacitors and super capacitors are in line with low carbon indicators. Welcome to visit our official website: https://www.jeccapacitor.com