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Main points of electrolytic capacitor selection
Jun 08, 2017

Rated voltage

Aluminum electrolytic capacitor body marked with capacity and pressure, these two parameters are very important, is the selection of capacitance of the most basic content.


In the actual capacitance selection, the change of the current speed of the place to use a larger capacity capacitance, but not the larger the better, first, the capacity of the increase, the cost and volume may rise, in addition, the larger the capacitor charge current is larger, the longer the charge time will be. These are the practical application selection to be considered.


Rated operating voltage: within the specified operating temperature range, the capacitance of long-term reliable work, it can withstand the maximum DC voltage. In the AC circuit, it is important to note that the maximum AC voltage value cannot exceed the DC operating voltage of the capacitor. The commonly used fixed capacitor operating voltage is 6.3V, 10V, 16V, 25V, 50V, 63V, 100V, 200V, 250V, 400V, 450V, 475V, 500V, 600V, 630V. Capacitance in the circuit to withstand the actual voltage can not exceed its pressure value.


In the filter circuit, the voltage resistance value of the capacitor should not be less than 1.42 times times the effective value of the AC. Another problem to pay attention to is the work voltage margin, generally more than 15%.


Let the capacitor's rated voltage have more Yu, can reduce the internal resistance, reduce leakage current, reduce the loss angle, increase life. Although the 48V working voltage uses 50V aluminum electrolytic capacitors for a short period of time will not be a problem, but the use of a long time, life can be reduced.


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