Alternating Current, the next evolution in Vaping?

GDay all

Being a Boilermaker / Welder I am aware of the advantages of AC current in a thermal process. In particular "high frequency" AC. It got me thinking.......... (Uh-oh)

AC would be an advantage in increasing the life of a coil. 2/3 of the heat in a DC circuit always resides at the positive side of the resistance. This would mean the + side of the coil will always be heated more.
With an AC the + is always swapping, so even distribution of heat /wear / flavor on the coil.

Most people are familiar with frequency or Hz (back and forth cycle) of AC. Most appliances operate at the stock 50Hz some appliances increase it to 120Hz plus depending on the use.
In welding, machines can increase the frequencies to up to 3000Hz plus creating an intense, concentrated area of heating, helping to lift oxides and impurities. Making difficult to weld metal such as Aluminium or Stainless much easier.
I thought the for practicality for a vaping application would be an easier vape of %100 VG and maintenance of the flavor which is currently diminished by %100VG. It may also prevent "caking" of the coil.

SO...........

Sound feasible, Could this be done?

Cheers Bob

 

your premise is flawed, 90% of the heat maybe at the positive electrode when welding as you are dealing with a non linear, reactive resistance. your arc is conducted by ions and electrons and the resistance is determined by the density of them.
a chunk of wire has an equal distribution throughout and the heat is even as well.
there is no hotspot.

 

Hi Bob, PWM mods *kinda* does AC by rapidly switching the power on/off at high frequency. Not AC though. Others with more electronic nouse than me will chime in and correct me if I'm wrong though

 

[YODA] So sure you are? Hmmmmm [/YODA]

Sorry for being flawed 8(



Yeh I am aware of that GT. But suppose the person who first thought of that was a goose noob too. lols

 

a series of experiments i have long intended to do is to try pwm at various low frequencys to see if it makes a difference. sub 10hz ..
ages ago i decided that ego works better than the same DC power and have been curious about it since.

 

lol, not a goose ..
another thing i want to try is to use an atty with AC with a boost circuit, only to improve efficiency though, no rectifier diode means another 0.25v or so getting to the atty.

i didn't say you where flawed, i said your premise was, i coukd see exactly where you got it from with the welding background, found it interesting too, i did not know that

was going to have another go at tigging last weekend, we got the dissapearing rod syndrome .. might explain it
its why the polarity change between tig and mig..

 

That'd be almost.comdible But I have nothing else useful to add, I figure you know way more than me in this area

 

Ya got the right electrode? Ali used Zirconiated Tungsten. Definately ACHF best for Ali.

Don't forget I'm not just thinking about the heat wear to coil but the benifits of AC, posibly HF for the VG liquid and coil clean.

You could also be real tricky and have a different voltage or time for each cycle back and forth. Constant PWM with out the on/off.

 

if any of you lot ever want to build a fuk wit you can have a blue print of my brain

 

Battery operated AC is possible, it just isn't practical. The energy lost in the conversion is too great to make it economically worthwhile.

 

i could make a boost mode device with an AC output with a higher efficiency than a DC one, you can eliminate the output rectifier which is always going to be a schottky diode with a forward voltage around the 0.2v mark.
It means a second winding and actually making a HF transformer instead of the traditional inductor, it would probably need a third small winding to provide feedback to a control circuit but its quite feasible to do and efficiency will be up over 90% with the right transformer.
The only losses are in the transformer and the switching FET, even PWM devices have a switching FET so it could be a quite efficient way to do it .. but I very much doubt that applying AC to an atty would make any difference than what DC does.

gtadmin mentioned once he thought DC converters where 90% efficient, I take it his experience is from the electric pushbike field with much larger currents, in those cases either the voltage is much higher so losing 0.25V in your output rectifier is less of a % in efficiency at 24v than it is at 3.7v, you b.comt chargers may even use active switching, where FETs are turned on and off to perform the final rectification instead of using diodes. Theoretically dropping the rectifier voltage down to under a 100mV .. not worth the complexity in an ecig though.

 

...yeah...well, i soldered a broken wire back onto the board of my twist this morning....


suck on that stoney. suck my big, fat, juicy knowledge hole.

 

Yes Stoney, from my exposure with electric bikes with voltages up to 72V DC I had the impression the efficiency was about 90%. That was formed from pooled experience, not my own. With 3.7V devices, I defer to your vast knowledge rather than my rather limited exposure.

(NOT sarcasm )

 

thats awesome.
you are now king twist and the resident expert on all things twistie.

lol, if you can't handle the heat .. get out of the technical area
I am not dumbing it down in this area.

so gonna make an AC pv to prove a point now.. i have some ferrite cores that will be perfect.

 

Hey Stoney ... I have a 35,000V 30 mA transformer here ..... wanna collaborate on a Jacobs Ladder Atomiser
Mmmm "plasma-ey" nicotine goodness

 

30mA .. pfft.
though .. thats a good few VA.

http://www.youtube.com/watch?v=0sne_uI2Yq4&feature=youtube_gdata_player

i made a wicked bug zapper with a 5kV supply from an old photocopier once, till the perspex .comght fire.
exploded moths are conductive, who knew.

 

LOL ... yep 30mA is a bit pissy , but the voltage should allow a decent spark gap over a Jacobs ... love the Tesla speaker , I had seen videos of smaller plasma speakers but had never seen a full coil belting it out like that

Thread officially derailed

[video=youtube;L9Jjsv2zr-c]http://www.youtube.com/watch?v=L9Jjsv2zr-c&feature=fvwrel[/video]

 

THe "Coiless AC ATTY"

View attachment 3222

 

i wouldn't want anyone to dumb anything down here. that's not how you learn.

one problem i see from using atomizing with the arc in that atty would be the heat. it'd look cool though.

 

i have wondeed how an ultrasonic vaporiser would work for ages.
this sorta thing, seems like lots of nutters are playng with petrol with em.
probably just a matter of time before some loses eyebrows and they get banned.

http://www.youtube.com/watch?v=hzgqxEU0sVc&feature=youtube_gdata_player