300W Resistive load?
in [Design]
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From: Martin Riddle on 17 Jul 2010 13:05 "John Ferrell" <jferrell13(a)triad.rr.com> wrote in message news:35n346lece4mj5a8mvmmegjsg4dei7heuj(a)4ax.com... > Small electric heater with switch able power level. > > I don't know about now, but in the distant past hardware stores sold > heating elements that screwed into porcelain light sockets. The > intended use was for chicken incubators. > > On Sat, 17 Jul 2010 09:36:24 -0400, Hammy <spam(a)spam.com> wrote: > >>What is something cheap and simple that can be used to dissapate 300W >>on a 200Vdc bus. I'm trying to think of something I could maybe pick >>up at a local homedepot or similiar. >> >>I need a 300W load to test out my PFC. > John Ferrell W8CCW Used these before for a 5KW load. Ceramic Cone heaters, can also get them straight vs cone. example: <http://www.akinsun.com/Accessories4.html> Cheers
From: mpm on 17 Jul 2010 15:02 On Jul 17, 11:56 am, Joerg <inva...(a)invalid.invalid> wrote: > Martin Riddle wrote: > > "Joerg" <inva...(a)invalid.invalid> wrote in message > >news:8ae3skFnekU1(a)mid.individual.net... > >> Hammy wrote: > >>> On Sat, 17 Jul 2010 07:37:28 -0700, Joerg <inva...(a)invalid.invalid> > >>> wrote: > > >>>> Hammy wrote: > >>>>> On Sat, 17 Jul 2010 07:00:35 -0700, Joerg <inva...(a)invalid.invalid> > >>>>> wrote: > > >>>>>> Hammy wrote: > >>>>>>> What is something cheap and simple that can be used to dissapate > >>>>>>> 300W > >>>>>>> on a 200Vdc bus. I'm trying to think of something I could maybe > >>>>>>> pick > >>>>>>> up at a local homedepot or similiar. > > >>>>>>> I need a 300W load to test out my PFC. > >>>>>> Light bulbs? Two in series and then as many of those in parallel > >>>>>> as needed. > >>>>> Sounds good one 60W bulb is about 200 ohms. ... > >>>> At 200V each bulb gets only 100V so the resistance will be a little > >>>> lower. You could measure that if it must be precise. > >>> I don't need high precision if I can test at even 80% rated load and > >>> maybe do some pulse test and off course use a CT to check the input > >>> current I'll be happy. > > >> Well, just wanted to mention that because when at undervoltage the > >> bulbs > >> will present a higher load. Also, when you start any kind of converter > >> from zero they will almost look like a short initially. Same if you > >> connect a cold bulb (cold filament) to a running converter. It's not > >> like a power resistor. > > >>>>> ... I'll look around for some small cheap bulb mounts. > >>>> You can also solder to them. If careful they can later still be used > >>>> for > >>>> their intended purpose. But make sure you place them onto a heat > >>>> resistant surface during the test :-) > >>> Your taking all the fun out of this :-) > > >> The fun might come back when connecting the cold bulbs not two by two, > >> but all at once. Tchk ... *POOF*. > > >>>> Good news is you may not even have to drive all the way to Home > >>>> Depot. > >>>> Supermarkets also have a variety of them. Of course, then your wife > >>>> might hand you a lengthy "while you are there anyhow" list and you > >>>> don't > >>>> get to look at all the new power tools, barbecues and stuff. Man's > >>>> toy > >>>> store ... > >>> We call that a honey do list here.;-) > > >> Nah, a honey-do list isn't grocery shooping, it's when the missus > >> wants > >> you to get that tree stump out over yonder, and it's 105F :-) > > >> -- > > > Better pick up extra incandescent bulbs, comes 2014, you wont be able to > > get them here in the US. > > Probably not quite. First, there'll be another election before then and > ... well, we'll see. > > Then the ban extends down to 40W AFAIK. I am sure some clever business > will start selling 39W light bulbs. The basic idea seems to come from > Poland: > > http://mojapolskadomowa.blox.pl/resource/zarwka99w.jpg > > A gray market might also develop. In Germany where 100W bulbs have been > banned long since they are still happily selling them: > > http://www.lampenwelt.de/Leuchtmittel/Gluehlampen/E27-Gluehlampen/E27... > > As for frosted ones which were particularly frowned upon by regulators > the page states "Bei Lampenwelt.de erhalten Sie matte Glühlampen noch > aus größeren Restbeständen. Lieferung sofort ab Lager solange der Vorrat > reicht!" which means " ... frosted light bulbs from large overstock. > Prompt delivery as long as stock lasts!". For some reason it must have > lasted more than a year by now :-) > > Ban, compliance, two different things it seems. > > -- > Regards, Joerg > > http://www.analogconsultants.com/ > > "gmail" domain blocked because of excessive spam. > Use another domain or send PM.- Hide quoted text - > > - Show quoted text - Yeah.... and then we'll have to deal with all the advertising hype for those "innovative" companies that come up with a 39.9 W bulb and claim some benefit derived therefrom. I wonder if this is how that extra 9/10th of a cent per gallon we pay at the gas pump came into being..??? :)
From: Joerg on 17 Jul 2010 15:29 mpm wrote: > On Jul 17, 11:56 am, Joerg <inva...(a)invalid.invalid> wrote: >> Martin Riddle wrote: >>> "Joerg" <inva...(a)invalid.invalid> wrote in message >>> news:8ae3skFnekU1(a)mid.individual.net... >>>> Hammy wrote: >>>>> On Sat, 17 Jul 2010 07:37:28 -0700, Joerg <inva...(a)invalid.invalid> >>>>> wrote: >>>>>> Hammy wrote: >>>>>>> On Sat, 17 Jul 2010 07:00:35 -0700, Joerg <inva...(a)invalid.invalid> >>>>>>> wrote: >>>>>>>> Hammy wrote: >>>>>>>>> What is something cheap and simple that can be used to dissapate >>>>>>>>> 300W >>>>>>>>> on a 200Vdc bus. I'm trying to think of something I could maybe >>>>>>>>> pick >>>>>>>>> up at a local homedepot or similiar. >>>>>>>>> I need a 300W load to test out my PFC. >>>>>>>> Light bulbs? Two in series and then as many of those in parallel >>>>>>>> as needed. >>>>>>> Sounds good one 60W bulb is about 200 ohms. ... >>>>>> At 200V each bulb gets only 100V so the resistance will be a little >>>>>> lower. You could measure that if it must be precise. >>>>> I don't need high precision if I can test at even 80% rated load and >>>>> maybe do some pulse test and off course use a CT to check the input >>>>> current I'll be happy. >>>> Well, just wanted to mention that because when at undervoltage the >>>> bulbs >>>> will present a higher load. Also, when you start any kind of converter >>>> from zero they will almost look like a short initially. Same if you >>>> connect a cold bulb (cold filament) to a running converter. It's not >>>> like a power resistor. >>>>>>> ... I'll look around for some small cheap bulb mounts. >>>>>> You can also solder to them. If careful they can later still be used >>>>>> for >>>>>> their intended purpose. But make sure you place them onto a heat >>>>>> resistant surface during the test :-) >>>>> Your taking all the fun out of this :-) >>>> The fun might come back when connecting the cold bulbs not two by two, >>>> but all at once. Tchk ... *POOF*. >>>>>> Good news is you may not even have to drive all the way to Home >>>>>> Depot. >>>>>> Supermarkets also have a variety of them. Of course, then your wife >>>>>> might hand you a lengthy "while you are there anyhow" list and you >>>>>> don't >>>>>> get to look at all the new power tools, barbecues and stuff. Man's >>>>>> toy >>>>>> store ... >>>>> We call that a honey do list here.;-) >>>> Nah, a honey-do list isn't grocery shooping, it's when the missus >>>> wants >>>> you to get that tree stump out over yonder, and it's 105F :-) >>>> -- >>> Better pick up extra incandescent bulbs, comes 2014, you wont be able to >>> get them here in the US. >> Probably not quite. First, there'll be another election before then and >> ... well, we'll see. >> >> Then the ban extends down to 40W AFAIK. I am sure some clever business >> will start selling 39W light bulbs. The basic idea seems to come from >> Poland: >> >> http://mojapolskadomowa.blox.pl/resource/zarwka99w.jpg >> >> A gray market might also develop. In Germany where 100W bulbs have been >> banned long since they are still happily selling them: >> >> http://www.lampenwelt.de/Leuchtmittel/Gluehlampen/E27-Gluehlampen/E27... >> >> As for frosted ones which were particularly frowned upon by regulators >> the page states "Bei Lampenwelt.de erhalten Sie matte Gl�hlampen noch >> aus gr��eren Restbest�nden. Lieferung sofort ab Lager solange der Vorrat >> reicht!" which means " ... frosted light bulbs from large overstock. >> Prompt delivery as long as stock lasts!". For some reason it must have >> lasted more than a year by now :-) >> >> Ban, compliance, two different things it seems. >> >> -- >> Regards, Joerg >> >> http://www.analogconsultants.com/ >> >> "gmail" domain blocked because of excessive spam. >> Use another domain or send PM.- Hide quoted text - >> >> - Show quoted text - > > Yeah.... and then we'll have to deal with all the advertising hype for > those "innovative" companies that come up with a 39.9 W bulb and claim > some benefit derived therefrom. > > I wonder if this is how that extra 9/10th of a cent per gallon we pay > at the gas pump came into being..??? :) > Or the $999.95 laptop. It's all about making a buck :-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Tim Williams on 17 Jul 2010 15:37 Get a few of these. Junk or surplus preferred, but hell, they're pretty cheap new. http://www.alliedelec.com/search/productdetail.aspx?SKU=8954935 Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms "Hammy" <spam(a)spam.com> wrote in message news:59c3469ooo0uve3t1be9bkfepoqu06a2u3(a)4ax.com... > What is something cheap and simple that can be used to dissapate 300W > on a 200Vdc bus. I'm trying to think of something I could maybe pick > up at a local homedepot or similiar. > > I need a 300W load to test out my PFC.
From: Joerg on 17 Jul 2010 15:43
Tim Williams wrote: > Get a few of these. Junk or surplus preferred, but hell, they're pretty cheap new. > > http://www.alliedelec.com/search/productdetail.aspx?SKU=8954935 > $10 is cheap? That's more than a six-pack of the good stuff. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |