[AMPS] Ripple current ratings of high voltage caps.
km1h@juno.com
km1h@juno.com
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.
>> 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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