4.35v Li-Ion Charger Option (YiboYuan External Cell Phone Battery Charger - various models available)

I have yiboyuan universal version, and it is very good.
I can charge any cell phone battery, it is adjustable.
I got it from DX, which is the same one on this link

It do not look great, but it might be usable.

Has CY1 a couple of approval marks on it? If not, I would be very careful with using it.

Interesting idea. I wonder why it's all old-school, through-hole components. I took a gamble and ordered one from Tmart. Thanks for the report Garry.

I've found some YiboYuan AC-10 chargers on EBay which are 600mA rated. Think I'll order two of those.

-Garry

Here's where I ordered the two AC-10's if anyone is interested.

-Garry

Probably a stupid question, but which battery contact is positive and which is negative?

Check them with a meter. I haven't used mine.

-Garry

Got it, thanks! Positive is on the left and negative is on the right. (On mine at least.) I can’t believe I didn’t think of that! :8)

Well today I received my two new YiboYuan chargers I ordered on Ebay (see post#26 above). Came from a US Warehouse, not extremely fast, but not terribly slow either (faster than Tmart!). I did in fact receive YiboYuan chargers, HOWEVER I received two model AC-11's and not AC-10 (it was only the photos in the Ebay listing that showed AC-10, it wasn't stated anywhere in the listing). I don't think this is a big deal though since I can't spot any difference between an AC-10 and an AC-11. Both are 4.35v @ 600mA charge rate with a USB output as well.

In any case, here are some pics:

The internals don't look as sophisticated as the first charger. My first question is, where is the AC -> DC circuitry (i.e. the 4 way bridge rectifier circuit)? So how does this one look? Does it look safe?

-Garry

No response?

-Garry

Cheap equipment sometimes only uses one diode not a bridge rectifier.

It does not look safe for 230VAC.

Thanks HKJ. Well I won't ever use it on 230V AC. So you think it's safe for 120V AC use? And what is controlling the charge termination? I don't see an IC like I would expect.

-Garry

I cannot say it is safe, but if the blue part beside D3 has some safety approvals it might be (I expect it is placed between mains and low volt side).

It looks like the charge is controlled my Q3 and Q4 and I doubt it is very precise and I also doubt there is any charge termination.

If you had provided a photo of the other side of the circuit board also, it would have been easier to see.

Would you use these chargers or recommend them for the general population? Really, thats the question isn’t it? :slight_smile:

No, I believe they look to much like the cheap usb power supplies:

But due to the 110 VAC, the safety requirements in US is considerable less and it might pass.

So it seems the first chargers I received from T-Mart would be better suited to use than this second set. I would definitely charge up to 4.2v on another charger first due to the slow 350mA charge rate on that first charger. Ugh - thought I had a good solution going.

-Garry

Tmart one, post 19

Could you take a picture of the markings on the blue capacitor (marked “CY1” on the pcb) and a picture of the other side of the pcb?

Ok, but you will have to wait as I don't have it with me right now.

-Garry

CY1 bridges the high voltage & low voltage sides. Needs to be a quality cap with a proper rating. HKJ asked about its markings earlier in the thread.

OK, here are photos of the first charger (350mA from Tmart):

Backside of board:

And a closeup of that cap.:

As you can see, it reads "102/1KV". So how is that? Any additional concerns?

(I'm going to see if I can replace that first pic with one in better focus (I'm only using my phone) - be right back. EDIT - Done.)

Thanks,
-Garry