300W Resistive load?
in [Design]
|
From: Hammy on 17 Jul 2010 15:58 On Sat, 17 Jul 2010 12:43:46 -0700, Joerg <invalid(a)invalid.invalid> wrote: >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. Agreed I'd need about fifty bucks worth of them, which is more then I want to spend.
From: Baron on 17 Jul 2010 16:14 Hammy Inscribed thus: > On Sat, 17 Jul 2010 12:43:46 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >>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. > > > Agreed I'd need about fifty bucks worth of them, which is more then I > want to spend. How about a couple of yards of electric fire bar element. -- Best Regards: Baron.
From: Sjouke Burry on 17 Jul 2010 16:27 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. wire a few car headlights together, each is 50-70W.
From: krw on 17 Jul 2010 18:21 On Sat, 17 Jul 2010 09:56:36 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Martin Riddle wrote: >> "Joerg" <invalid(a)invalid.invalid> wrote in message >> news:8ae3skFnekU1(a)mid.individual.net... >>> Hammy wrote: >>>> On Sat, 17 Jul 2010 07:37:28 -0700, Joerg <invalid(a)invalid.invalid> >>>> wrote: >>>> >>>>> Hammy wrote: >>>>>> On Sat, 17 Jul 2010 07:00:35 -0700, Joerg <invalid(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. I already have a couple hundred clear 60W bulbs. I'll buy another couple of hundred by 2012, which is when the ban goes into effect. >Probably not quite. First, there'll be another election before then and >... well, we'll see. The ban was put in place BO. I doubt the Republicans will have the guts to turn that one around. >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 How about dual 30W filaments? Or perhaps 19/39(/58)? ;-) >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/E27-15W-100W-Gluehlampe-matt.html >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. Try buying a real toilet. Well, if you don't live near a Canuckistani HomeDespot.
From: Hammy on 17 Jul 2010 18:26
On Sat, 17 Jul 2010 17:21:39 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: [SNIP] >Try buying a real toilet. Well, if you don't live near a Canuckistani >HomeDespot. Yea we have Mohawks running bootleg booze and smokes across the lake and yanks smuggling toilets back the other way.;-) |