Ta-da! - sci.electronics.design

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sci.electronics.design
Message from discussion Ta-da!
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NNTP-Posting-Date: Mon, 08 Oct 2012 13:35:31 -0500
Date: Mon, 08 Oct 2012 14:35:31 -0400
From: Phil Hobbs <pcdhSpamMeSensel...@electrooptical.net>
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Subject: Re: Ta-da!
References: <j4u578pv9jifi32umd9nqahhreu5uo8sko@4ax.com> <c3v5789cftjd0dnad9ci1gp6kp8sr7hk0e@4ax.com> <260693263371406980.559847address_is-invalid.invalid@shawnews>
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On 10/08/2012 12:39 PM, Ralph Barone wrote:
> Jim Thompson<To-Email-Use-The-Envelope-I...@On-My-Web-Site.com>  wrote:
>> On Mon, 08 Oct 2012 09:06:13 -0700, John Larkin
>> <jjlar...@highNOTlandTHIStechnologyPART.com>  wrote:
>>
>>> On Mon, 08 Oct 2012 08:24:23 -0700, Jim Thompson
>>> <To-Email-Use-The-Envelope-I...@On-My-Web-Site.com>  wrote:
>>>
>>>> On Mon, 08 Oct 2012 08:12:21 -0700, John Larkin
>>>> <jjlar...@highNOTlandTHIStechnologyPART.com>  wrote:
>>>>
>>>>> On Mon, 08 Oct 2012 07:42:02 -0700, Jim Thompson
>>>>> <To-Email-Use-The-Envelope-I...@On-My-Web-Site.com>  wrote:
>>>>>
>>>>>> On Sun, 07 Oct 2012 21:01:44 -0700, John Larkin
>>>>>> <jjlar...@highNOTlandTHIStechnologyPART.com>  wrote:
>>>>>>
>>>>>>> On Sun, 07 Oct 2012 20:45:01 -0700, Jim Thompson
>>>>>>> <To-Email-Use-The-Envelope-I...@On-My-Web-Site.com>  wrote:
>>>>>>>
>>>>>>>> On Sun, 07 Oct 2012 19:26:05 -0700, John Larkin
>>>>>>>> <jjlar...@highNOTlandTHIStechnologyPART.com>  wrote:
>>>>>>>>
>>>>>>>>> On Sun, 07 Oct 2012 18:21:58 -0700, Jim Thompson
>>>>>>>>> <To-Email-Use-The-Envelope-I...@On-My-Web-Site.com>  wrote:
>>>>>>>>>
>>>>>>>>>> On 08 Oct 2012 01:09:30 GMT, Jim Mueller<wrongn...@nospam.com>  wrote:
>>>>>>>>>>
>>>>>>>>>>> On Sun, 07 Oct 2012 15:59:17 -0700, Jim Thompson wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Critiques, suggestions welcome...
>>>>>>>>>>>>
>>>>>>>>>>>> http://www.analog-innovations.com/SED/CAP_Dropper-type_Supply.pdf
>>>>>>>>>>>>
>>>>>>>>>>>> Sand in air ignored.
>>>>>>>>>>>> 		
>>>>>>>>>>>>                                          ...Jim Thompson
>>>>>>>>>>>
>>>
>>>
>>> ==============look here =======================
>>>
>>>>>>>>>>> Your simulation doesn't include your power input source, presumably a
>>>>>>>>>>> rectifier, based on your label.
>>>>>>>>>>
>>>>>>>>>> Full-wave rectified, straight off AC line.  +VRECT to -VDC
>>>>>>>>>
>>>>>>>>> You didn't show the Vrect waveform. What pulls it down? A bridge
>>>>>>>>> rectifier without some pulldown can't keep sloshing charge into/out of
>>>>>>>>> the current limiting capacitor.
>>>>>>>>>
>>>>>>>>> Replace Vrect with a floating AC supply and a bridge rectifier, and it
>>>>>>>>> won't work.
>>>>>>>>
>>>
>>>>>>>> Says the fraud.  There's lots of pulldown... it's a PFC supply.
>>>
>>> ==============look here =======================
>>>
>>>
>>>>>>>> 		
>>>>>>>>                                         ...Jim Thompson
>>>>>>>
>>>>>>> Is the PFC supply on all the time? If so, what is this circuit needed
>>>>>>> for? It certainly can't be used to start up the PFC, if it needs the
>>>>>>> PFC for pulldown.
>>>>>>
>>>>>> Yep.  I think the Chinese are fudging on me.  They show me waveforms
>>>>>> with a worst case trough no higher than about 10V off of -VDC.  I've
>>>>>> asked a New Zealander (in HK, they sort of speak English :-) to run a
>>>>>> storage scope view from t=0.  I will likely just halve the cap and
>>>>>> pick off from a phase... I'm already on the "hot side" any way.
>>>>>> 		
>>>>>>                                         ...Jim Thompson
>>>>>
>>>>> You call me a fraud! Clearly you didn't think this through. Looks like
>>>>> I saved your cookies again. I really should stop doing that.
>>>>>
>>>>> What's weird is that I pointed out this problem last week, and you're
>>>>> just now catching on to it.
>>>>
>>>> I was spending my time refining the control for the TRIAC.
>>>>
>>>>>
>>>>> It's rare for the unloaded output of a bridge rectifier to look
>>>>> anything like abs(sin(w*t)).
>>>>
>>>> The Chinese assured me, and sent a scope photo.  The bridge load
>>>> capacitance is only 100nF... and there's a whole lot of shit hanging
>>>> on there that's "defined" to me only as a block.
>>>>
>>>> But, indeed, your nudging raised my concerns, which is why I've
>>>> requested a look-see by an English-speaking buddy.
>>>>
>>>> Which nudging, in normal _discussion_ is great.  But your intent seems
>>>> only to be an asshole.
>>>> 		
>>>>                                         ...Jim Thompson
>>>
>>> Look at the conversation highlighted above. I pointed out the pulldown
>>> problem without personal comment. You replied by calling me a fraud.
>>
>> OK.  My apologies.  How about we limit ourselves to strictly
>> electronics from now on?
>> 		
>>                                          ...Jim Thompson
>
> I for one would like to see this. Of all the possible things I can learn
> from you two, new ways to insult people is pretty low on the usefulness
> index.

They aren't even new.  They're strictly from the sixth grade, except for 
replacing "momma" with "wife".

Cheers

Phil Hobbs
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