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Registered Member #1935
Joined: Sun Jan 25 2009, 04:42AM
Location:
Posts: 2
Hello everyone
I've decided to build a ZVS flyback driver recently. Anyway, I'm trying to buy all the components I can from one site (mouser.com). I've found all the parts so far except for a bipolar capacitor with the proper values.
My question: can I use two polar capacitors instead of one bipolar one? I've read some posts on other sites suggesting that this can be done. However, the way to do this is rarely explained or consistent with other sites/posts. I haven't found any posts on this site handling this situation.
It seems most of the posts I read say that two polar capacitors in series, with reversed polarities, works. However, some people say that the capacitance will still be divided and some say it wont.
Registered Member #1935
Joined: Sun Jan 25 2009, 04:42AM
Location:
Posts: 2
Wow Thank you so much Shaun. I looked on that site for about an hour for something like that. I fail pretty hard.
Anyway, I'd still like to know, out of curiosity, about using 2 polar capacitors instead of 1 bipolar one. How is it done? How does it affect capacitance?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I don't know which capacitor do you mean, but if it's the 0.68uF resonant one, then using two antiparallel electrolytics for it will surely result in an instant explosion...
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well, polar capacitors do not like to be charged in reverse at all. They are not rated for voltage reversal, and i am sure repeated 10-20% would asplode them. BTW the physically larger, the better, as it can dissipate heat better.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
One way of making a bipolar cap from two electrolytic caps is by putting them back to back. This is only good for things like DC blocking for small signal levels. That's all really...
Registered Member #567
Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
Actually, I fail to see how two bipolar caps would work in a LC tank circuit at all.
A tank circuit depends on power 'sloshing' from the inductor to the capacitor, yes? Now, if you have two bipolar capacitors, say energy from the inductor goes into cap A. Now, for a normal tank circuit, the voltage would then reverse. That wouldn't work for antiparallel capacitors as far as I can see.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
The polar caps wouldn't be in anti parallel if it would stand the high currents in a tank circuit. They would be put in series with either the negative or the positive connected to each other.
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bipolar capacitors -- two polar capacitors?
