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Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
When designing an MMC capacitor I know that when you put capacitors in series the voltage rating increases but does this effect the peak and RMS current ratings? If so how? I will be using CDE capacitors from either series 942C (http://www.cde.com/catalogs/942C.pdf) or 940C (http://www.cde.com/catalogs/940C.pdf), more likely 942C. If I do use the 942C series, I will be using the 2000VDC rated ones. Thank you.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
since they are in series the current for all is the same for one. if they were in paralell the current rating would be the number of caps times the rating of one but the voltage rating is for one if all. all the caps have to have the same amount if capacitance. thats how big DRSSTC have large MMC banks using series parallel arangments
Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
teravolt wrote ...
since they are in series the current for all is the same for one. if they were in paralell the current rating would be the number of caps times the rating of one but the voltage rating is for one if all. all the caps have to have the same amount if capacitance. thats how big DRSSTC have large MMC banks using series parallel arangments
I am now designing another coil and rereading your reply to my post, I realized that I do not fully understand the information you provided. Do you mean that if a have a string made of capacitors rated at, for example purposes, 10 amps each, no matter how many capacitors are in the string the string will be rated 10 amps peak? And for strings in parallel the current rating would be 10 (assuming the answer to the previous question is yes) times the number of strings in paralell? Thanks for clarifying this for me!
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Think of caps as batteries, they are very similar in that fact that:
If you connect batteries (or capacitors) in series you increase there voltage rating example: If you connect 2 12v batteries in series you will now have a 24V battery but, at the same current rating. The same goes for caps if you connect 2 2000V caps in series you will make a 4000V cap and there current rating will stay the same.
If you connect batteries (or capacitors) in parallel you increase there amp/hour (capacitance) rating example: If you connect 2 12v 10ah batteries in parallel you will now have a 20ah battery but it will still be 12v. The same goes for caps if you connect 2 2000V 1uF caps in parallel you will now have a 2uF cap but it will still have a voltage rating of 2000v.
So basically you series caps till you get the correct voltage rating, then you parallel strings of caps till you get the correct capacitance rating.
Registered Member #2677
Joined: Mon Feb 08 2010, 03:06AM
Location: Palo Alto, California, USA
Posts: 64
Goodchild wrote ...
Think of caps as batteries, they are very similar in that fact that:
If you connect batteries (or capacitors) in series you increase there voltage rating example: If you connect 2 12v batteries in series you will now have a 24V battery but, at the same current rating. The same goes for caps if you connect 2 2000V caps in series you will make a 4000V cap and there current rating will stay the same.
If you connect batteries (or capacitors) in parallel you increase there amp/hour (capacitance) rating example: If you connect 2 12v 10ah batteries in parallel you will now have a 20ah battery but it will still be 12v. The same goes for caps if you connect 2 2000V 1uF caps in parallel you will now have a 2uF cap but it will still have a voltage rating of 2000v.
So basically you series caps till you get the correct voltage rating, then you parallel strings of caps till you get the correct capacitance rating.
Thanks for that. The battery analogy is an interesting and ingenious way of looking at the problem:-)
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MMC Capacitor Current Ratings
