On Jun 24, 2005, at 5:42 PM, Will Matney wrote:
> David, I was going for 1000 V, and was thinking 1 kV so must have
> added it and didn't catch it. The graph on the website showed a 1000 V
> drop over the range of 0-1 ampere. About every power supply I've built
> using a transformer, with capacitor input, you can divide the no-load
> voltage by 1.12 or 1.13 (12-13%) and generally find the full load drop
> in voltage. That switching supply dropped by a third or about 30-35%
> if I recall after looking at it yesterday +/- 100 volts give or take.
> Take say 3500 Vdc using a standard HV transformer and a regulation of
> 13%, it would be 3097 Vdc where you can see it's about 303 volts. This
> 1000 volt drop would cause the plate resistance to swing all over the
> place I would think.
Correct, but most of the switcher supplies that I've seen have a
feedback loop that maintains output V with changes in load-I.
>
> Best,
>
> Will
>
>
>
>>
>> Will Matney wrote:
>>> David,
>>>
>>> You are correct on the regulation. A regular transformer type
>>> power supply when designed right will have a regulation
>>> somewherre around 11-14%. In the case of the switching supply, it
>>> looks like 30-35%. 1000 kV drop over 1 amp is a good bit of sag.
>>>
>>> Best,
>>>
>>> Will
>>
>> I would have thought that cause serious non-linearity problems on SSB.
>>
>>
>> Having gone to a switch mode design, I would have thought they used
>> some
>> feedback to keep the voltage constant. But it seems not. Given the
>> line
>> voltage will probably sag too at 2.5kV, you can rekon on over a kV
>> drop
>> in practice.
>>
>> I assume you mean 1kV sag, or 1000V, and not 1000kV !! Reminds me of a
>> lecturer I know who got fed up with the cleaners moving his equipment
>> that worked from 12V. So he decided to put a sign on it
>>
>> "Danger, 1200000 uV"
>>
>> Apparently nobody touched it any more.
>>
>>>
>>> ----- Original Message -----
>>> From: "David Kirkby" <david.kirkby@onetel.net>
>>> To: "amps@contesting.com" <amps@contesting.com>
>>> Subject: Re: [Amps] HV Switch Mode Power Supplies
>>> Date: Fri, 24 Jun 2005 00:39:13 +0100
>>>
>>>
>>>> Steve Thompson wrote:
>>>>
>>>>> Winfried Kriegl wrote:
>>>>>
>>>>>
>>>>>> http://www.wattsunlimited.com
>>>>>> have a 2500W SMPS. Works fine.
>>>>>
>>>>> Looks very nice.
>>>>
>>>> But look at the regulation (or lack of).
>>>>
>>>> http://wattsunlimited.com/_wsn/page3.html
>>>>
>>>>
>>>> --
>>>> David Kirkby,
>>>> G8WRB
>>>>
>>>> Please check out http://www.g8wrb.org/
>>>> of if you live in Essex http://www.southminster-branch-line.org.uk/
>>>>
>>>>
>>>> _______________________________________________
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>>>> Amps@contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>>
>>
>>
>> --
>> David Kirkby,
>> G8WRB
>>
>> Please check out http://www.g8wrb.org/
>> of if you live in Essex http://www.southminster-branch-line.org.uk/
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
> --
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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