What are the causes of damage to film capacitors
2024-04-30 17:50:08
Under normal circumstances, the film capacitor life is absolutely very long, as long as the selection of the correct type, the use of the correct, it is definitely not easy to damage the electronic components on the circuit, but for a variety of reasons, some circuits used on the film capacitors are often damaged, what are the reasons for the damage of film capacitors?
Film capacitors
1, The circuit voltage is too high, resulting in film capacitors are breakdown.
Film capacitors are the most important parameter is the rated operating voltage, if the circuit voltage is too high, far more than the rated operating voltage of film capacitors, in the role of such a high voltage, film capacitors will occur inside the strong partial discharge and dielectric damage, and even lead to capacitor breakdown.
Secondly, you may also buy low-voltage film capacitors as high-voltage inferior film capacitors. As the market is now playing a serious price war, some manufacturers in order to make their capacitors more price competitive, will choose to use the low withstand voltage capacitor pretends to be a high withstand voltage capacitor, so there will be a capacitor's actual withstand voltage is not enough problems, but also easy to appear due to the voltage is too high and lead to the film capacitor is punctured.
2, The temperature is too high.
Film capacitors have its rated operating temperature, such as CBB's maximum withstand temperature is 105 ℃ (special reminder: there are still a large number of low-quality CBB capacitors on the market with a maximum withstand temperature of only 85 ℃), CL capacitor's maximum withstand temperature is 120 ℃ (low-quality maximum withstand temperature is 105 ℃). If film capacitors are operated for a long time at temperatures higher than their maximum allowable temperature, the thermal aging of the capacitor will be accelerated, and the life of the capacitor will be significantly shorter. On the other hand, in the installation and use of capacitors should pay special attention to the capacitor in the actual use of the working conditions of ventilation, heat dissipation and radiation problems, so that the capacitor in the operation of the heat generated can be emitted in a timely manner, so that you can prolong the service life of film capacitors.
3, Buy poor quality film capacitors lead.
Now the industry is too chaotic, in order to fight the price war, the quality of some manufacturers of capacitors has been completely no bottom line, they use the worst materials, production process is also able to save on the province, the design life of this capacitor is also about a year, if you buy poor quality film capacitors, it is also very easy to damage.