Why does the CBB film capacitor visibly heat up when it operates?

Many capacitors work with a lot of heat, but there are some capacitors heat is not obvious, that for CBB film capacitors, when using it will not be obvious heat?

1, CBB film capacitors do heat, but the heat is not big.

Theoretically, the CBB capacitor does not heat up because it belongs to the energy storage element, and in theory it does not lose power when used, so it does not heat up. The ideal capacitor is not lossy, but this is only ideal, and in reality the capacitor has an equivalent resistance, which causes the ripple to produce a change in current on the equivalent resistance. When ripple voltage occurs at both ends of the capacitor, the voltage at both ends of the capacitor changes and a changing current is formed, even intermittent pulsation power, which causes the poles in the dielectric material of the capacitor to oscillate, thus generating heat and causing the capacitor to heat up.

So although in theory CBB film capacitors do not produce heat, but in fact will heat, but the heat will not be too large, heat is not very obvious, the life of the capacitor has little impact.

2, CBB film capacitor work why obvious heat?

Possible cause one: ripple current is too large, high pressure resistance, etc. , these are due to improper capacitive modeling, CBB film capacitor modeling error, may indeed lead to the capacitor work obvious heat.

Possible reason two: CBB thin film capacitors around other large heat-inducing electronic components, due to poor cooling, resulting in CBB capacitor temperature rise, which belongs to other electronic components caused by thermal conduction.

Possible reasons three: buy cheap and inferior CBB film capacitors, due to the reasons for the price war, many small factories without brand CBB capacitors will use inferior film, this film is easy to break through, the media aging speed is too fast, life is reduced, serious words will become hot breakdown, resulting in damage to capacitors. Therefore, to buy poor quality CBB capacitors may appear capacitors obvious heat, short life, easy to damage the phenomenon.