Size of dc CAP

[Emadshaaban1987]

Hi folks
A ac to dc system 40vdc used 3300 micro f 50VDC.
Beacuse of the lace of spare parts can i use 33000 100vVDC

 

[Comcokid]

No problem to use a higher voltage capacitor. Frequently done. When doing replacements on older equipment you often find the newer parts that fit properly are higher voltage. This is because new parts are improved over the old.

 

[MacGyverS2000]

Increased voltage rating is generally not an issue, but 3,300uF to 33,000uF is an order of magnitude jump in value and may be an issue... where is the capacitor in the system and what is it used for?

Dan - Owner

http://www.Hi-TecDesigns.com

 

[itsmoked]

What Dan said!

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Comcokid]

I didn't see the extra zero!

 

[IRstuff]

A trade to be considered; lower ripple from the higher capacitance or higher surge current from same.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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[waross]

The initial charging current may cause problems.
Or
It may be a typo.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[IRstuff]

This explains why the original capacitor isn't rated at 40V:

https://www.niccomp.com/resource/fi...Capacitors-Voltage-Derating-guide-Aug2016.pdf

Some amount of derating is necessary to account for reliability lifetime, etc.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

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[wattyeng]

Increased voltage rating - ok
Increased 10x microfarad rating - depends upon circuit application and config

I.Eng MIMMM MIET MIPowerE AIOSH

 

[waross]

Welcome to Eng-Tips wattyeng.

Bill
--------------------
"Why not the best?"
Jimmy Carter