Battery physics question.

[Leudast]

Hey guys.

Haven't been vaping long, maybe 3 months. In that time though I went from an eGO, to mech, to dna20, to a dna 30.

Now I understand ohms law, the power equations, etc. I understand amp draw and what's safe for what kind of battery. I'm a little unclear on the voltages though.

So example. I have a Cana30, VTC5, & Foggerv4 at 1.2ohms. Firing this at 22W, I should be drawing 4.3A at 5.1 volts.

What I'm not understanding is how the VTC5 can accommodate this voltage. It's advertised as a 3.7, but we know fully charged it's really 4.2. How it is pumping 5 volts? What, if any, negative effects does this have on my battery?

 

[Bunnykiller]

there is a circuit in the mod that transforms the voltage up ( PWM) pulse width modulation. it takes dc current and pulses it into tiny coils on ferromagnetic cores and this along with some timing creates an increase in voltage... think transformer as in AC voltage...
the software in the chip controls the amount of increase and the board design limits total amps the circuit can handle safely.

 

[TomGeorge]

My understanding is that the DNA chip boosts and regulates the voltage somehow (magic vape fairies, idk) so that it can fire at 5 volts. There are not negative effects on the battery that I am aware of.

Also there are other threads with this information on it. I think stickeys threads in the modding forum under batteries

 

[porkchop_express]

DC boost converter

Basically the chip takes in power from the battery and stores it in a capacitor. When the stored energy reaches the potential (voltage) it dumps out to the atty.

 

[Thrasher]

this is why high drain batteries are important, as others have said there is a boost circuit, this pulls additional amperage from the battery and converts it into extra voltage so even though ohms law says "Firing this at 22W, I should be drawing 4.3A at 5.1 volts". this is an unregulated straight to the battery formula, the conversion has to be added in and in reality the mod could be drawing an easy 10-20% more amperage from the cell.

 

[Leudast]

there is a circuit in the mod that transforms the voltage up ( PWM) pulse width modulation. it takes dc current and pulses it into tiny coils on ferromagnetic cores and this along with some timing creates an increase in voltage... think transformer as in AC voltage...
the software in the chip controls the amount of increase and the board design limits total amps the circuit can handle safely.

Huh. For some reason I never considered a step up transformer. That makes loads of sense now. Thanks!

 

[Leudast]

... the conversion has to be added in and in reality the mod could be drawing an easy 10-20% more amperage from the cell.

Is that a general rule of thumb? 10-20% more? Is there a specific formula for the conversion?

I understand the concern if it does draw more because of the conversion, however with a 30A ceiling I doubt my battery is in much danger. Very good thing for me to keep in mind though. Thank you.

 

[Maisiedoodle]

My understanding is that the DNA chip boosts and regulates the voltage somehow (magic vape fairies, idk) so that it can fire at 5 volts. There are not negative effects on the battery that I am aware of.

Also there are other threads with this information on it. I think stickeys threads in the modding forum under batteries

LOL, magic vape fairies! I love it, they can come over to my place any day!

 

[TomGeorge]

LOL, magic vape fairies! I love it, they can come over to my place any day!

HAHA as long as they bring e-juice!!

 

[Baditude]

Is that a general rule of thumb? 10-20% more? Is there a specific formula for the conversion?

I understand the concern if it does draw more because of the conversion, however with a 30A ceiling I doubt my battery is in much danger. Very good thing for me to keep in mind though. Thank you.

Technical: Why High Drain Batteries?

http://www.e-cigarette-forum.com/forum/provape/524874-question-tech-engineers-provape.html



Hey Thrasher! Long time no see. Where ya been?

 

[Thrasher]

busy busy busy, my new job involves traveling and after 12 or so work hours i get back to the hotel and pass out, finally started to get weekends off and felt like being nosy.

been popping in just not enough energy to sign in and actually write something lol

Is that a general rule of thumb? 10-20% more? Is there a specific formula for the conversion?

well it depends on the quality and efficiency of the converter but I cant imagine one being so inefficient it uses more them 20%.

but yea it is always good to file it away for future considerations. too many people buy low output batteries becuase they do the straight ohms law and dont leave any room for conversion, which "can" lead to poor performance of the modas it struggles to pull the needed current out of the cell.