Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
[marked-for-tagline]

idea: add, search, annotate, link, view, overview, recent, by name, random

meta: news, help, about, links, report a problem

account: browse anonymously, or get an account and write.

user:
pass:
register,


                                 

50 KHz power mains supply in homes

for induction cooking purposes
  (+1, -2)
(+1, -2)
  [vote for,
against]

This will be in addition to existing 50/60 Hz supply. Induction cookers can be made economically since they will contain a just a simple coil.
VJW, Dec 11 2010

40-50kHz lighting ballast http://www.nvc-ligh...howCPt.Aspx?ID=1451
Good for avoiding 50-60Hz hum [csea, Dec 12 2010]

[link]






       Pros/ cons? Not really an idea unless there are other applications. This isn't the MilliBakery.   

       The existing infrastructure is optimized for 50 or 60Hz for lots of good reasons.
csea, Dec 11 2010
  

       well, it's the most dangerous frequency to use. I can't think of any other reasons.
WcW, Dec 11 2010
  

       //Pros/ cons?//   

       //Induction cookers can be made economically //   

       Significant portion of an induction cooker is high power oscillator which will essentially be taken away from all household induction cookers and put into a central place. Thus less maintenance. economical manufacturing.   

       //most dangerous frequency to use.// pl. explain
VJW, Dec 11 2010
  

       I know too little about these things, but are you suggesting a mains supply of that frequency? If so, wouldn't that necessitate a separate set of powerlines, generators and so forth, or you'd just be putting some sort of thingamajig outside the house somewhere. Also, where does the heat start? Does that frequency inherently heat wires? If so, that sounds dangerous.
nineteenthly, Dec 11 2010
  

       // most dangerous frequency to use //   

       The ideal frequency for inducing cardiac fibrillation in homo sapiens is 55 - 56 Hz. Conventional AC mains is near enough the most lethal AC frequency possible.   

       Using 50 or 60 kHz actually makes a lot of sense.   

       To support existing appliances, all that is needed is a "smart" bridge rectifier that down-switches the HF to LF. Easily done - single chip solution.   

       And if you forget the gismo ? Don't worry. The device simply won't work.   

       Some switch mode power supplies won't bother at all about this.
8th of 7, Dec 11 2010
  

       So, we should change the entire national power supply so that induction cookers can be made more cheaply.   

       Hmmm.   

       Better, surely, to convert to a petahertz system, thereby making lightbulbs cheaper.
MaxwellBuchanan, Dec 11 2010
  

       Actually it does not have to be just induction cooker but anything that heats up really. e.g. iron, hair dryer, heater, geyser, etc.
VJW, Dec 11 2010
  

       What about using 2.4GHz?
Ian Tindale, Dec 11 2010
  

       At 50 KHz, I think human body does not feel electrical shock.
VJW, Dec 12 2010
  

       But it could receive Radio Luxemburg.   

       The reactance in the transmission would give huge volt drops. If coax cable was used, then you would need to tap off at precise intervals, and the load and source impedances should match for best power transfer.
Ling, Dec 12 2010
  

       Beleive it or not, this is being considered for cars and potentially at a later date aircraft. Already it can be used for lighting - see Juice Technology - www.juicetechnology.co.uk.   

       The idea for cars and more so for aircraft, is that higher frequency allows smaller magnetic components - transformers and inductors. Also, as such devices are so small, more of them can be used, allowing isolating breaks (magnetically coupled) to be placed more often and thus have a high level of immunity from noise.   

       A big negative is any sub harmonics of the 50kHz humm would be seriously annoying. Especially to other people's pets and kids. Thinking about that, scrub the negative out...
saedi, Dec 12 2010
  

       Doubles as a "mosquito"-style deterrent as used in shopping centres.
nineteenthly, Dec 12 2010
  

       Pass it to an antenna via a resistive microphone and you'got a industrial grade radio station transmitting AM .
VJW, Dec 12 2010
  

       I worked for many years in a audio product design / development facility where the lighting was driven by 50kHz a/c, so as to avoid interference with sensitive audio equipment. Ballasts are commonly available for such purposes. [link]
csea, Dec 12 2010
  

       This is outside of my E field (ho, ho), but aren't transmission line losses dependent on frequency? As I remember, different transmission media have different dominating loss effects, but 'skin effect' is definitely due to HF, and there should be some kind of loss effect due to transmission line capacitance.   

       There's also the fact that 60Hz might be a lot easier (cheaper) to generate than something that is 3 orders of magnitude higher.
Jinbish, Dec 12 2010
  
      
[annotate]
  


 

back: main index

business  computer  culture  fashion  food  halfbakery  home  other  product  public  science  sport  vehicle