Jazz,
That is so out of character for the g man I am still pondering the motivation. I will agree that the thread need to lighten up a bit.
DNA 200 Watt
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Jazz,
That is so out of character for the g man I am still pondering the motivation. I will agree that the thread need to lighten up a bit.
It's got some sort of built in balanced thingy that takes care of it.
I understood when I read about it, honest!...(see sig)
Yet you still didn't "like" his post??? That's harsh George!Jazz,
That is so out of character for the g man I am still pondering the motivation. I will agree that the thread need to lighten up a bit.
The balance charger is built into the board so you can charge from the USB port at 1a from what I understand.
I'm really looking forward to seeing the data sheet with the board lay out and sizes so that I can start building my enclosure.
I've only ever used evolve boards in DIY mods and so far I've had 100% reliability so the DNA200 is a must for me.
I've only ever used evolve boards in DIY mods and so far I've had 100% reliability so the DNA200 is a must for me.
Yet you still didn't "like" his post??? That's harsh George!
No I liked it but you know "Beware of Greeks Bearing Gifts".
Removing one of the only real safety concerns I have with beginners with lipo... Leave the lipo in... When it starts to give out, replace. So long as people follow the smart practice of not charging while asleep or not around to monitor it
Lol. Nice BNEAT...much preferred over regurgitated text, but it's pretty hard to go in much greater detail than that.
Well.... He wasn't wrongLol. Nice BNEAT...much preferred over regurgitated text, but it's pretty hard to go in much greater detail than that.
Actually @Pdizzle, that's a very good observation. Generally a 3s LiPo pack would be charged by a series charge method that would, in this case, need to charge to 12.6v. And that's not going to happen from a USB power source that only supplies 5v. Just like your 2s pack in your other mod requires an external charger to supply 8.4v at full charge. But multi cell LiPo packs can be charged in a parallel configuration only requiring the voltage level of a single LiPo cell, so 4.2v which can be charged from a standard USB power source. And parallel charging can be done with balancing and remain a safe charging method. So I think Evolv probably chose a parallel charging method to make sure this mod could be charged from standard USB charging sources like computers and USB wall chargers.
If that's the case, quite smart and eliminates the need to include a separate charger with the mod since just about everyone has some type of USB power source available to them.
Anyone know how long it took vaporshark to announce the dna40 chip after evolv released the dna40?
I've been looking around other forums, man o man it appears this is not going well anyplace but here. Many gripes about the dna40 and other devices working correct/better etc..
People are loving the Chinese mods they have marketed some decent/awesome affordable TC device, 42-70 bucks w/ good attractive enclosures, its a whole different world now for Evolv. There's TC mods on FT that have huge following and they work great, maybe not as good as the dna40 IDK but they don't burn cotton and some have said they work better than the dna40. One month and the vape world drastically changes, this moves so fast its better than the gold rush of new..
People at joe's and other forums still saying their returned updated returned updated DNA40 screen still glitches, ya not looking great except for us who like Evolv products..
Not trying to be negative nancy, but ya, it is whats being posted..
People are loving the Chinese mods they have marketed some decent/awesome affordable TC device, 42-70 bucks w/ good attractive enclosures, its a whole different world now for Evolv. There's TC mods on FT that have huge following and they work great, maybe not as good as the dna40 IDK but they don't burn cotton and some have said they work better than the dna40. One month and the vape world drastically changes, this moves so fast its better than the gold rush of new..
People at joe's and other forums still saying their returned updated returned updated DNA40 screen still glitches, ya not looking great except for us who like Evolv products..
Not trying to be negative nancy, but ya, it is whats being posted..
They might be using a boost converter to up the voltage from 5V to the charging voltage. The output current is fairly low so the circuitry would be small. Then the higher voltage would just be fed to the "top" of the 3S pack. The balancer/cell monitor would only then need to handle the few milliamps for balancing and for turning off the charger if it detected a problem.
Parallel charging would either require three separate, isolated, power supplies (which would be bulkier) or circuitry to switch in/out each cell to a single power supply (also bulky).
If someone was able to read the markings on the two black chips closest to the USB connector, that would help a lot. If they were allowed to tell us what the markings were, that is.
It's not good to ignore the competition that's for sure. Performance/price/availability everything counts in the survival race.
Duane
This is one of the reasons I bought a SX Mini M. The chip isn't bad but I don't like the mod. I ordered a Boxer mod with a SX350j and have the SXM for sale in the classifieds.
They might be using a boost converter to up the voltage from 5V to the charging voltage. The output current is fairly low so the circuitry would be small. Then the higher voltage would just be fed to the "top" of the 3S pack. The balancer/cell monitor would only then need to handle the few milliamps for balancing and for turning off the charger if it detected a problem.
Parallel charging would either require three separate, isolated, power supplies (which would be bulkier) or circuitry to switch in/out each cell to a single power supply (also bulky).
If someone was able to read the markings on the two black chips closest to the USB connector, that would help a lot. If they were allowed to tell us what the markings were, that is.
Possibly, but I don't think a typical 1Amp USB power source would work well for boosting the voltage from 5v to 12.6. It would not be able to deliver 1Amp of charge after boosting. And a single power source can be applied in parallel charging, no need to have 3 separate power supplies for this. The 3 cells are treated as 1 cell as far as the power source is concerned, and the balancing would take care of keeping the charge levels equal.
The boosted voltage charging current would be about 350-400mA, resulting in a 3-4hr charge time for a 3S 1000mAh LiPo pack (depending on when the charger turns off). Not too bad, and about the same time as 1A charging a single very high capacity 18650.
You can't apply the output of a single supply across each cell in a series stack of cells. You end up shorting the power supply. Here's an exceptionally crude drawing to show this...
Dropbox - parallel charging with one supply.jpeg
As you can see, the connections between BATT1/BATT2 and BATT2/BATT3 short the supply.
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Correct, if you were charging as series battery pack (although you can charge multiple series battery packs in parallel mode and be treated as a single series battery pack by the charger with 3x the Mah rating). But if you charge them as individual cells, in parallel, it would not be a series stack. It would just be a single cell with Mahx3 for the purpose of charging. The method of charging does not have to be the same as the method of discharging.
I agree.
But this goes back to the point I brought up earlier. You have to have circuitry to disconnect the series connections and create parallel connections, and back again, adding more components to the charging/balancing circuit. It can be a lot simpler to just use a tiny boost circuit and charge at the same (equivalent) rate as charging three single cells in parallel.
Switching from series to parallel and back again under microcontroller command also requires that the microcontroller never, ever lock up or get its code scrambled by static discharge, electrical interference, whatever. Otherwise one or more cells could be shorted out. A riskier strategy than charging in series in my opinion.
Three 1000mAh cells in parallel @ 1A charge rate pretty much equals three 1000mAh cells in series at 350-400mA charge rate. Since the charging time is about equal, I think that the board designer would probably pick the smaller, less risky, less expensive circuit to do the job.
Well...I would.
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