Use film capacitors to pay attention to current and voltage

In recent years, the development of film capacitors has been quite fast. In the electronics, home appliances, telecommunications, electric power, electrified railways, hybrid vehicles, wind power, solar power and many other industries, film capacitors can be seen, thanks to its There are many kinds of different types and characteristics, and the range of use is different. It is mainly divided into power supply electromagnetic interference capacitors, polypropylene film capacitors, polyester film capacitors, film foil capacitors, foil capacitors, and polyphenylene sulfide. Capacitors, etc. But one thing that they have figured out is that they need to pay attention to the current and voltage when they are used.

The choice of film capacitor depends on the high voltage applied during operation and is affected by factors such as the applied voltage waveform, current waveform, frequency, ambient temperature (capacitor outer surface temperature), ambient humidity, and capacitance. Before use, please check whether the voltage waveform, current waveform and frequency at both ends of the capacitor are within the rated value of the selected capacitor.

When an alternating current or pulse voltage is applied across the capacitor, due to the loss of the capacitor, the alternating current or pulse current through the capacitor causes the capacitor to heat itself to generate a temperature rise, and thermal breakdown occurs under severe conditions with the risk of smoke and fire. . Therefore, the capacitor usage conditions are not only controlled by the rated voltage but also by the rated current. The rated current is considered to be the pulse current and continuous current (usually expressed as peak or control) determined by the breakdown mode. It is necessary to confirm that both currents are within the allowable range of the capacitor.

Pay attention to the current and voltage when using a film capacitor. It is important to choose a suitable capacitor to avoid machine error and damage and avoid accidents.