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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.
40-50kHz lighting ballast
http://www.nvc-ligh...howCPt.Aspx?ID=1451
Good for avoiding 50-60Hz hum [csea, Dec 12 2010]
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Pros/ cons? Not really an idea unless there are other applications. This isn't the MilliBakery. |
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The existing infrastructure is optimized for 50 or 60Hz for lots of good reasons. |
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well, it's the most dangerous frequency to use. I can't think of any other reasons. |
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//Induction cookers can be made economically // |
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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. |
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//most dangerous frequency to use.//
pl. explain |
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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. |
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// most dangerous frequency to use // |
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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. |
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Using 50 or 60 kHz actually makes a lot of sense. |
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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. |
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And if you forget the gismo ? Don't worry. The device simply won't work. |
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Some switch mode power supplies won't bother at all about this. |
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So, we should change the entire national power supply so
that induction cookers can be made more cheaply. |
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Better, surely, to convert to a petahertz system, thereby
making lightbulbs cheaper. |
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Actually it does not have to be just induction cooker
but anything that heats up really. e.g. iron, hair
dryer, heater, geyser, etc. |
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At 50 KHz, I think human body does not feel
electrical shock. |
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But it could receive Radio Luxemburg. |
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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. |
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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. |
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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. |
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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... |
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Doubles as a "mosquito"-style deterrent as used in shopping centres. |
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Pass it to an antenna via a resistive microphone and
you'got a industrial grade radio station transmitting
AM . |
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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] |
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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. |
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There's also the fact that 60Hz might be a lot easier (cheaper) to generate than something that is 3 orders of magnitude higher. |
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