JENSEN Jensen NOS Aluminium foil Руководство по эксплуатации онлайн [22/23] 778569

- I need large capacitances in my circuit; can I parallel connect the fire pole capacitors to

increase the capacitance and at the same time maintain the advantageous filter/suppression

effect?

Yes you can and what is more you can also parallel connect two pole capacitors to the four

pole ones and by this mean reuse your old two pole capacitor and in meantime take advantage

of the four pole capacitors filter and suppression effect.

When you connect the four pole capacitors in parallel, on the classical way by connecting one

capacitor’s positive input to the others positive inputs, the positive output to the others

positive output and so on, you are not only getting the capacitance multiplied but at the same

time the direct current resistance reduced, as the resistance of the foils are also parallel

coupled.

It is very advantageous when you need high DC current flow on the capacitor bank.

INPUT + OUTPUT

By parallel coupling of the four pole capacitors, their filter/suppression effect is fully

maintained. It means that the transfer impedance corresponds to the capacitance value you

have achieved by parallel coupling of two or more four pole capacitors.

For example 10.000 µF 40 V four pole capacitors transfer impedance is about 1.3 mΩ (check in

the table on the datasheet). When two of them are parallel coupled the capacitance is the

double, about 20.000 µF and the transfer impedance is about 0,9 mΩ, almost same as the

transfer impedance of a 22.000 µF 40 V capacitor seen in the table. In case of parallel coupling

of three pieces of the same type, the transfer impedance decreasing to about 0,7 mΩ and so

on.

The filter/suppression effect is fully maintained but the DC resistance is multiplied when you

parallel couple four pole electrolytics by connecting the first capacitors positive output to

seconds positive input and the first’s negative output to the seconds negative input and so on

if you want connect more capacitors.

+ +

INPUT OUTPUT INPUT OUTPUT

- -

This method has both advantages and disadvantages. The disadvantage is coming from the

fact that the DC current must flow trough both the anode and cathode foil of all capacitors you

connect in parallel. The DC resistance could be up to a few ohms, when coupling three or more

capacitors in parallel by this way. The loss coming from this source together with losses caused

by the ripple will be so high that this coupling method could be considered as unacceptable in

most of the applications.