Step Up Converter 5v - 12v

[Ogoun]

Hello,
I just started my first project Minipulse Plus. (still unfnished)
At the moment its powered with 8 x AAA Alkaline Batteries.
Is it possible to power it with a 5v USB Akku pack using a 5v to 12v step up booster?
Or will it produce to much ripple?
Im really new to this whole electric stuff.

thx

[Davor]

Only way to make it work decently is by synchronising a booster with a Minipulse. Usual step up boosters will be very noisy. I had a similar idea, but reality was faster

[Ogoun]

Just found some pics of Booster output and looks like richterskala 8.4.
The MPP converts the 12v input to +5v and -5v right?
Or does he need 12v anywhere? Have to recheck the schematics.

Would be rly nice to use a 5v power bank.

Just did a fast google search and there are synchronized Step Up Converters.
But like I said, im a bloody rookie.
Should it be sync'd to Coil pulse? Or need every section (rx/tx) its own sync?
I know its too big for my tiny understanding of how things work, but im just curious.

[eclipse]

I was also interested in trying to run a PI with boost converter. I picked up XL6009 based one. Pretty common one, you've seen it, perhaps own one,it's cheap, <2$.
It will need a LC filter. It should reduce the ripple. 100uH + 100uF (low ESR) + 100nF (ceramic) cap LC filter will probably do the job.
I'm using lot's of decoupling caps on each op amp so I hope will work good.
My plan is to run it on 2x18650 (2x3.7V) batts.

[Ogoun]

https://datasheets.maximintegrated.c...90-MAX8715.pdf
Looks interesting.
But first i need to finish my pi.
Shouldnt start modding it before it actually works

[Ogoun]

Just an idea :
5v usb akku pack ---> 5vto12v step up converter -----> single 12v AA akku ---> PI
Using the 12v as a Buffer.
38mAh.

[Qiaozhi]

You need to bear in mind that using a voltage booster will place great demands on the battery. For example, let's say you have a peak current from the coil of 2A - this figure (of course) depends on the particular coil parameters and the TX pulse width - and you plan to use a 5V battery and boost it to 12V. In that case the peak current drawn from the battery will be 2.4 * 2A = 4.8A (plus efficiency losses in the booster). You'll need a really good quality 5V battery if you want it to last for more than a couple of hours.

[ivconic]

You need to bear in mind that using a voltage booster will place great demands on the battery. For example, let's say you have a peak current from the coil of 2A - this figure (of course) depends on the particular coil parameters and the TX pulse width - and you plan to use a 5V battery and boost it to 12V. In that case the peak current drawn from the battery will be 2.4 * 2A = 4.8A (plus efficiency losses in the booster). You'll need a really good quality 5V battery if you want it to last for more than a couple of hours.

This is true.
On "paper" everything looks so promising, while in practice it usually fails with common battery types.
Don't use LiPo or Li ion, rather use Nicad or gel cell in such current demanding setup.
Latest example i had with FelezJoo PI from the other topic.
I put two 18650 (labeled as 4200mAh!) in parallel and boosted the voltage to 18v.
It works... barely 20 minutes.
Later on i realized it is much better solution to make smaller step in boosting up the voltage.
Ended up with conversion from 12v to 18v. Turns out it is good compromise.
Step up converters will work nice if step rate is something like 2/3.
As rate increase; the current drawn increases more.
9V battery will be better choice to get 12V in that case.
Or... try to obtain highest quality battery you can.

[Ogoun]

Maybe ill install a step up with usb to charge a internal BatPack.
I just like the idea to charge my PI everywhere.
And i can use the external PowerBank to extand the BatPack.
Should work with NiCd.

[ivconic]

Maybe ill install a step up with usb to charge a internal BatPack.
I just like the idea to charge my PI everywhere.
And i can use the external PowerBank to extand the BatPack.
Should work with NiCd.

Yes NiCd are better choice for power consuming applications.
And for only charging, yes; you can do that.
Adjustable ready made step up converters are cheap and obtainable everywhere.
NiCd's are not demanding and delicate on charging conditions and with adjustable step up converter you will have wide choice.
I am having picture on my mind; how durable and resistive are NiCd's at battery operated screwdrivers and drills!
It's a real "mule" among batteries. Survives all the possible tortures.
For PI detector you can use exactly such battery without even taking it out of original package (to keep original charging pins and internal fuse).
Along with it you also have it's original charger with socket and charging pins.
And outdoor you may charge it from powerbank.

[Bill512]

ivconic, rechargeable Lithium batteries (Li-ion .Li-po,etc) have evolve much in the recent years.
Speaking for the 18650 size, the maximum capacity will be at around 3400mAh, only from branded cells and not from unlabeled chinese cells.
The nominal max current for these high capacity cells will be at 5, 10A for some .
Now, if you want 18650 for power tools, then there are other 18650's with a lower capacity but with high current capabilities, say 30A continius.

[Carl-NC]

You need to bear in mind that using a voltage booster will place great demands on the battery. For example, let's say you have a peak current from the coil of 2A - this figure (of course) depends on the particular coil parameters and the TX pulse width - and you plan to use a 5V battery and boost it to 12V. In that case the peak current drawn from the battery will be 2.4 * 2A = 4.8A (plus efficiency losses in the booster). You'll need a really good quality 5V battery if you want it to last for more than a couple of hours.

Regardless of whether you use a boost converter, you always want the transient coil current to come from a cap, not the battery or regulator. Ergo, a boost converter only needs to provide charging current over the pulse period. Not a tall order, and I've done it with no problem.

Also, I used an unsynchronized high frequency switcher (probably around a MHz) and had no noise issues. This was at White's so I can't provide details (because I can't remember).

[ivconic]

ivconic, rechargeable Lithium batteries (Li-ion .Li-po,etc) have evolve much in the recent years.
Speaking for the 18650 size, the maximum capacity will be at around 3400mAh, only from branded cells and not from unlabeled chinese cells.
The nominal max current for these high capacity cells will be at 5, 10A for some .
Now, if you want 18650 for power tools, then there are other 18650's with a lower capacity but with high current capabilities, say 30A continius.

You are most probably right.
The ones with which i had such bad experiences are cheap ones bought on flea market, labeled as "4200mAh" !!!?
Most probably made in China and far bellow labeled current.

[Artyom]

The most effective step-up converter on-chip SX 1308