Aluminum electrolytic capacitor selection?

Electrolytic capacitor marked on the body of the volume and pressure, these two parameters is very important, is the most basic content choose capacitance. Rated voltage: the specified working temperature range, capacitance work reliably for a long time, it can withstand the largest dc voltage. In ac circuits, attention should be paid to the ac voltage of the maximum value cannot exceed the dc working voltage value of the capacitance. Commonly used with six fixed capacitor voltage. 3 v, 10 v, 16 v, 25 v, 50 v, 63 v、100 v、250 v、400 v、500 v、630 v。 Capacitance in circuit actually bear the pressure value of voltage can't exceed it. In the filter circuit, capacitance pressure value not less than 1 of ac RMS. 42. Also, pay attention to a problem is a problem of working voltage margin, generally in more than 15%. Let the rated voltage of the capacitor with more margin, can reduce the internal resistance, to reduce the leakage current, reduce the loss Angle and increased longevity. Although say, 48 v working voltage using 50 v aluminum electrolytic capacitor short time there is no problem, but used for a long time, it may reduce service life. In actual capacitance type selection, electrolytic capacitor manufacturers recommendations, fast to current change places with a large capacity of capacitor, such as ox horn electrolytic capacitor, electrolytic capacitor or bolt capacity but not the bigger the better, first of all, increases capacity, cost and volume could increase, in addition, the greater the capacitance charging current, charging time will be longer. These are the actual application to consider in the selection.

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