Why does the CBB film capacitor generate heat when working?

Many capacitors generate a lot of heat when working, but some capacitors do not generate heat obviously. So for CBB film capacitors, will they generate heat obviously when in use?

1. CBB film capacitors do generate heat, but not much.

Theoretically speaking, the CBB capacitor will not generate heat because it is an energy storage component. In theory, no power loss will occur when it is used, so it will not generate heat.An ideal capacitor has no loss, but this is only an ideal. In reality, capacitors have equivalent resistance, which causes the ripple to produce a changing current on the equivalent resistance.When ripple voltage appears across a capacitor, the voltage across the capacitor changes continuously, forming a changing current or even intermittent pulsating power, which causes the poles in the dielectric material of the capacitor to oscillate, thereby generating heat and causing the capacitor to heat up.

So although theoretically CBB film capacitors do not generate heat, they do generate heat in reality, but the heat generated is not too large and the heat is not extremely obvious, which has little effect on the life of the capacitor.

2. Why does the CBB film capacitor generate noticeable heat when working?

Possible reason one: The ripple current is too large, the withstand voltage is too high, etc. These are caused by improper capacitor shape. The wrong shape of CBB film capacitor may indeed cause the capacitor to heat up significantly when working.

Possible reason two: There are other electronic components with high heat generation around the CBB film capacitor. Due to poor heat dissipation, the temperature of the CBB capacitor rises. This is caused by heat conduction from other electronic components.

Possible reason three: You bought cheap and low-quality CBB film capacitors. Due to price wars, many small factories and unbranded CBB capacitors use low-quality films. This kind of film is easy to break down, the dielectric ages too quickly, and the lifespan is shortened. In severe cases, it will cause thermal breakdown, thus causing damage to the capacitor.Therefore, if you buy inferior CBB capacitors, the capacitors may become noticeably hot, have a short lifespan, and be easily damaged.