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Registered Member #8247
Joined: Thu Nov 22 2012, 03:14AM
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Posts: 18
If I put two .1uF caps in series I get .05uF. What would be the point of that? Are the two caps in series able to sustain they're discharge longer then a single .05uF or something? I suspect I am missing something with caps in series.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Yes, they will withstand double the rated voltage. However, depending on the capacitor, you may also want to use balancing resistors across each capacitor to ensure the voltage shares equally between capacitors.
Registered Member #8247
Joined: Thu Nov 22 2012, 03:14AM
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Ok, thats what I thought. So when in series the capacitance potential drops (I consider it the current), and therefor the voltage increases because its inversely proportional.
So if I had two 100V .1uF caps in series the capacitance is .05uF but the voltage stored/coming from that "capacitor bank" initially is 200V, is that a correct way to think about it?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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The current will still be the same - its a series connection.
Only the voltage "rating" or capability of the capacitor increases. So instead of having a single capacitor that can handle 100V, you would have a single capacitor (albeit with half the capacitance BUT twice the ESR and ESL) that can handle 200V.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
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Posts: 4245
Ken Williams wrote ...
So if I had two 100V .1uF caps in series the capacitance is .05uF but the voltage stored/coming from that "capacitor bank" initially is 200V, is that a correct way to think about it?
You will be able to charge them to 200V, yes, but the capacitance is halved.
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Caps In Series Question
