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Old 4th October 2010, 06:15 PM   #1
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Default Four pole (Jenssen) Capacitor question

What happens if you charge a four pole capacitor with a lower voltage on the input than rated? Is the output still the rated voltage?

Thx
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Old 4th October 2010, 06:24 PM   #2
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Do you mean a four section electrolydic capacitor for power supply application? If so the voltage ratings on all sections must be at, or higher that what you are trying to replace.
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Old 4th October 2010, 06:26 PM   #3
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Yes, for power supply usage. But I was just wondering theoretically, if you put 12V on the 2 input poles of a Jensen four-pole, and it's rated 63V - do you get 12V on the output as well then?

I just have basic knowledge of electronics, I'm just curious about this.
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Old 4th October 2010, 08:31 PM   #4
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by Yves Smolders View Post
What happens if you charge a four pole capacitor with a lower voltage on the input than rated? Is the output still the rated voltage?
No
Quote:
Originally Posted by Yves Smolders View Post
... if you put 12V on the 2 input poles of a Jensen four-pole, and it's rated 63V - do you get 12V on the output as well then?
Yes

Power supply smoothing capacitors do not make the voltage higher or lower. They just smooth it to get rid of noise, ripple, spikes etc.

The capacitors voltage rating is the maximum voltage allowed.
So a capacitor rated 63V can be used for 12V (or 25V or 40V etc) but not e.g. 70V or 100V.

This is important - if too high a voltage is applied to an electrolytic capacitor, it can explode and cause damage or injury.

Regards - Godfrey
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Old 7th October 2010, 04:38 AM   #5
qusp is offline qusp  Australia
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yes, I think more research is in order before you even TOUCH a power supply
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