Frequency characteristics of film capacitors compared to electrolytic capacitors

The amount that any capacitor consumes under the action of electric field force. Generally, the amount of heat consumed by a capacitor per unit time under the action of electric field force is called the loss of the capacitor, which is expressed by active power. However, the active power cannot explain the quality of the capacitor's loss characteristics, so we use the loss tangent value to accurately represent the capacitor's loss characteristics. High frequency loss is an important index of film capacitors, and it directly affects the reliability of the whole machine. At present, many electronic instruments use a higher switching frequency, about 10KHZ. This requires that the product has good performance at high frequencies, but it is difficult to achieve for electrolytic capacitors.

The changes of the capacitance of a film capacitor and an electrolytic capacitor with frequency in a greenhouse were measured through experiments. The capacitance of the electrolytic capacitor gradually decreases with increasing frequency, while the film capacitor is basically unchanged. At the same time, the dielectric loss angle tangent of the two kinds of capacitors in the greenhouse was measured as a function of frequency, and the conclusion was that the loss of the electrolytic capacitor increased sharply with the increase of frequency, but the capacitance of the film capacitor changed only slightly. It can be seen in the comparison process that the film capacitor has a wide operating frequency range, low frequency loss, and good frequency characteristics.

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