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36. How to choose the DC power supply filter capacitor?

In Electronic Infomation Category: 3 | on November 25,2011

Filter capacitor in the switching power supply plays a very important role, the right choice filter capacitor, especially the choice of the output filter capacitor is every engineering and 36 datasheet and technical personnel are very concerned about. 50 Hz frequency circuits used in common electrolytic capacitors, the ripple voltage frequency of only 100 Hz, charge and 36 price and discharge time is orders of magnitude of milliseconds. For smaller ripple factor, the required electrical capacity of up to hundreds of thousands of microfarads, the general low-frequency electrolytic capacitors of the main objective is to increase the capacitance, capacitor capacitance, loss tangent and 36 suppliers and leakage current is to identify their advantages and disadvantages of the main parameters. The switching power supply output filtering electrolytic capacitor, the sawtooth voltage and frequency up to tens of kilohertz, or even tens of megahertz, then the capacitance is not the main indicators to measure the merits of the standard high-frequency electrolytic capacitors is the "impedance a frequency "characteristics of the work required in switching power supply there should be a low frequency equivalent impedance, while working for the semiconductor devices produced by high-frequency spikes have a good filtering effect. Ordinary low-frequency electrolytic capacitors in the 10 kH beginning to show emotional about it, switching power supply can not meet the requirements. The dedicated high-frequency switching power supply electrolytic capacitors with four side, both ends of cathode aluminum capacitor leads as positive and negative ends of aluminum as the negative leads, respectively. Current from the four-terminal capacitor into a positive side, after an internal capacitor, and then from the other end of the flow is negative

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