Aluminum electrolytic capacitor
marked on the body of the volume and pressure, these two parameters is very important, is the most basic content choose capacitance.
In actual capacitance type selection, fast to current change places with a large capacity of capacitance, but not the capacity is 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.
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、200 v、250 v、400 v、450 v、475 v、500 v、600 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.
Also, pay attention to a problem is the 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.
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