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The role of filter capacitor in power supply rectification

Source: Company Dynamics Editor: PingShang Click: Release time: 2021-01-29 10:17:01

    Filter capacitor play a very important role in switching power supplies to filter out AC components. Make the output DC smoother. And for precision circuits, parallel

The combination of capacitor circuits can improve the working effect of the filter capacitor. Low-frequency filter capacitor are mainly used for mains filtering or filtering after transformer rectification.

The electro-induced is 50Hz; and the high frequency filter capacitor mainly works in the filtering after the switching power supply is rectified, and its working frequency is several thousand Hz to tens of thousands Hz.

    The filter capacitor plays a very important role in the switching power supply. How to choose the filter capacitor correctly, especially the choice of the output filter capacitor, is ten per engineering and technical personnel.

Points of concern. Common electrolytic capacitor used in 50 Hz power frequency circuits have a pulsating voltage frequency of only 100 Hz, and the charging and discharging time is on the order of milliseconds. To get

With a smaller pulsation coefficient, the required capacitance is as high as hundreds of thousands of microfarads. Therefore, the goal of ordinary low-frequency aluminum electrolytic capacitor is to increase the capacitance, and the capacitance and loss of the capacitor

The tangent value of the consumption angle and the leakage current are the main parameters to distinguish its pros and cons.

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