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[AMPS] Ripple current ratings of high voltage caps.

To: <amps@contesting.com>
Subject: [AMPS] Ripple current ratings of high voltage caps.
From: km1h@juno.com (km1h@juno.com)
Date: Sat, 6 Mar 1999 17:35:01 -0500


On Sat, 6 Mar 1999 20:00:31 +0200 "John Fielding" <johnf@futurenet.co.za>
writes:
>
>HI Rich - from Nichicon catalog for the GQ series, the leakage current 
>for a 470uF @ 450V
>should be less than 1380uA to remain in spec.  Probably a worst case 
>but over 1mA still
>seems a bit high.  And leakage current is temperature dependent 
>increasing as temperature
>goes up.  For comparison the 85C series (LQ etc) have the same leakage 
>current specs. 
>BTW the spec is for a capacitor having the rated voltage applied for 5 
>mins, measurement
>is taken after the 5 mins.  How does this compare with the CDE parts?  


Go on-line and see for yourself. There is simply too much data to belabor
the reflector much longer.

73  Carl  KM1H




>We see very little
>US component data here, mostly Japanese and European, would be 
>interesting to compare the
>various manufacturers.
>
>John   ZS5JF
>
> 
>
>----------
>> From: Rich Measures <measures@vc.net>
>> To: km1h@juno.com; amps@contesting.com
>> Subject: Re: [AMPS] Ripple current ratings of high voltage caps.
To: <amps@contesting.com>
>> Date: 06 March 1999 01:31
>> 
>> 
>> 
>> 
>> >
>> >
>> >>>Hope this of some interest as I feel that spending $$ 
>un-necessarily on 
>> >>>105C rated capacitors to end up with less ripple current 
>capabilty is a 
>> >>pointless fact.
>> >>>
>> >>Ä  However, comparing a ripple-current rating for 105 deg C with a 
>
>> >>ripple current rating for 85 degrees C is hardly valid.   My guess 
>is that 
>> >>105 deg C capacitors are going to last longer in a typical anode 
>supply.  
>> >>
>> >>-  later, John
>> >>
>> >>
>> >>Rich...
>> >
>> >I have to agree with Rich on this one !
>> >
>> >I can not speak for Nichicon but the life and derating curves for 
>the CDE
>> >380 85c and 381 105c series show a much longer expected life span 
>when
>> >both are run at 85c. Even at 45c the 105 c cap has a significant 
>edge.
>> >
>> >Further, at equivalent 85c temperatures, the ripple ratings are 
>almost 
>> identical.
>> >
>> >IMO, in an anode supply of an amp in the 1200W or higher category 
>the
>> >105c cap will make both life and economical sense.
>> >
>> ?  amen, Carl.  I have replaced plenty of 85 deg C rated 
>electrolytics.  
>> I have replaced no 105 deg C rated electrolytics.  
>> 
>> >Personally, I would not want to use the ALL Electronics specials in
>> >anything much above a SB-200 size amp without running temp and 
>leakage
>> >tests.
>> >
>> ?  Agreed.  Anything over 250uA of leakage at the rated V is 
>suspect.  
>> Also, capacitors that are slow to reform are showing signs of aging. 
> 
>> 
>> 
>> 
>> Rich...
>> 
>> R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  
>> 
>> 
>> --
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>
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