Charging port.

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Charging port.

Post by Rad » Sat Feb 06, 2021 12:02 pm

Hi guys, this probably has been asked to death but can't find much info.
I want to use the charging port of the Th9xb. I am using a couple of li ions 18650 with no balance plug, so I think I could start using that port instead of forcing the back tray of the radio, because the battery is a super tight fit.

Is there something I have to consider? What is the name of the plug, and where goes the positive and negative?
Using 9xtreme board.

Thanks!
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Kilrah
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Re: Charging port.

Post by Kilrah » Sat Feb 06, 2021 12:24 pm

If I remember well the 9x has a diode in the charge path so you'd need to remove that or it would mess with the voltage measurement. And it's not great to charge without balancing/protecting the individual cells.

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Re: Charging port.

Post by Rad » Sat Feb 06, 2021 12:35 pm

Kilrah wrote:
Sat Feb 06, 2021 12:24 pm
If I remember well the 9x has a diode in the charge path so you'd need to remove that or it would mess with the voltage measurement. And it's not great to charge without balancing/protecting the individual cells.
Hi, it is a pack with a built in chip, so it works good with no balance plug.

Let me know if you remind where is that diode that needs to be removed.
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MikeB
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Re: Charging port.

Post by MikeB » Sat Feb 06, 2021 2:26 pm

The diode is on the back board, near where the wires from the charge socket connect.

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Re: Charging port.

Post by Rad » Sat Feb 06, 2021 3:46 pm

MikeB wrote:
Sat Feb 06, 2021 2:26 pm
The diode is on the back board, near where the wires from the charge socket connect.

Mike
Great news is in the easy side of the radio! I did not want to touch the zillion things I have installed.

Ok, I have been googling a while, and the connector is 5.5mm x 2.1mm. Ill get one and I will wire it to my smart charger.
Once I have the parts here I will open the radio and remove that diode. I only have to remove it and replace with a bit of wire, right? or is there something else you recommend me?
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Re: Charging port.

Post by MikeB » Sat Feb 06, 2021 4:04 pm

The diode is on the "other" side of the board, so to replace it will require the board to be removed. You could, however, just solder a wire across it without removing the board.

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Re: Charging port.

Post by Rad » Sat Feb 06, 2021 4:17 pm

MikeB wrote:
Sat Feb 06, 2021 4:04 pm
The diode is on the "other" side of the board, so to replace it will require the board to be removed. You could, however, just solder a wire across it without removing the board.

Mike
Thanks! No probs at all removing that board.
The problem would be the other side of the radio. There are so many things there now, being the encoder the worst part of it that at this point I'd think twice before touching it.
https://radindustries.wordpress.com/202 ... /my-radio/
Image

Ill be ordering the jack today. Thanks as always!
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Re: Charging port.

Post by Rad » Fri Feb 19, 2021 11:26 am

Hey, small update here.

I have the jack almost in the way, once this chinese new year ends it will be shipped. I took a look at the radio and I will remove that diode as you pointed me. Due to mistakes happen I think it would be great to keep some sort of reverse polarity protection there. Can I install a mosfet or something similar that does not cause voltage drop?

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Re: Charging port.

Post by bob195558 » Fri Feb 19, 2021 3:46 pm

Have you seen this, Reverse Current Protection Mod for 9xtreme
https://openrcforums.com/forum/viewtopi ... 126&t=7745
Er9x on 9x radio, with Smartieparts Programmer and TelemetrEZ Board.
ErSky9x on Taranis, Sky9x, 9Xtreme radios.
3D-Printing: (https://openrcforums.com/forum/viewforum.php?f=129).

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Re: Charging port.

Post by Rad » Fri Feb 19, 2021 7:08 pm

bob195558 wrote:
Fri Feb 19, 2021 3:46 pm
Have you seen this, Reverse Current Protection Mod for 9xtreme
https://openrcforums.com/forum/viewtopi ... 126&t=7745
Yes sir, and I did it long time ago, but I dont know if that mod is only for plugging the battery the wrong way, or if also works for the charging port.
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Re: Charging port.

Post by Rad » Mon Feb 22, 2021 9:44 am

Has anybody more info about it?
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Re: Charging port.

Post by jhsa » Mon Feb 22, 2021 10:07 pm

A while ago, I have designed a completely new switch board for my 9x radios, that had reverse polarity protection on both power and charge circuits I think.. It would also keep the radio ON if the switch suddenly failed and made some bad connection.
I need to search my old files.. actually, all my radios have this installed :)
I might also have posted it here on the forum somewhere.

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Re: Charging port.

Post by jhsa » Mon Feb 22, 2021 10:14 pm

My er9x/Ersky9x/eepskye Video Tutorials
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Re: Charging port.

Post by Rad » Tue Feb 23, 2021 10:34 am

jhsa wrote:
Mon Feb 22, 2021 10:14 pm
Found the forum thread..

https://openrcforums.com/forum/viewtopi ... =95&t=8210

João
My godness, after reading your thread, this is me:

https://www.youtube.com/watch?v=9CS7j5I6aOc

Way too much info and diagrams that I am afraid I cannot understand, lol.
Your idea might be an overkill for me. Would it be possible to just install something for reversing protection in the side of the radio where the original diode is?
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Re: Charging port.

Post by MikeB » Tue Feb 23, 2021 11:04 am

Go to the first post if this thread: https://openrcforums.com/forum/viewtopi ... it=9xtreme.
Download the file 9xtreme_schematic.pdf.
At the top of the diagram you will see Q3, this is a P-Channel MOSFET (AO3407A SOT23 package). This is wired as a reverse polarity protection device. All you need to do is to wire a suitable P-Channel MOSFET across the existing protection diode, DRAINsource to the charger input, SOURCEdrain to the other side of the diode and gate to ground. You may wish to find a MOSFET in a wired package (e.g. TO92) rather than a surface mount device. Just find one that meets the same specification as the AO3407A.

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Re: Charging port.

Post by Rad » Tue Feb 23, 2021 4:22 pm

MikeB wrote:
Tue Feb 23, 2021 11:04 am
Go to the first post if this thread: https://openrcforums.com/forum/viewtopi ... it=9xtreme.
Download the file 9xtreme_schematic.pdf.
At the top of the diagram you will see Q3, this is a P-Channel MOSFET (AO3407A SOT23 package). This is wired as a reverse polarity protection device. All you need to do is to wire a suitable P-Channel MOSFET across the existing protection diode, source to the charger input, drain to the other side of the diode and gate to ground. You may wish to find a MOSFET in a wired package (e.g. TO92) rather than a surface mount device. Just find one that meets the same specification as the AO3407A.

Mike
Thanks Mike, that seems much more doable for me. I took a look at the T092 in aliexpress and I found it has a very similar look to a "BK15 BS170" thing I bought in the past if I remember correctly, for the haptic in the radio. Would it work? Or do I just get the this T092?
https://www.aliexpress.com/item/3290717 ... hweb201603_
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Re: Charging port.

Post by MikeB » Tue Feb 23, 2021 7:21 pm

NO! The 2N7000 is a N-Channel MOSFET, you need a P-Channel MOSFET.
Tricky to find one in a TO92 package that handles a couple of amps, you may need to go for a larger package, or perhaps a surface mount D-PAK package device. You need a device that handles 2A (or more), has a VGS of at least 10V (your battery voltage, and a VDS of 20V (or more).

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Re: Charging port.

Post by Rad » Wed Feb 24, 2021 5:06 pm

Oh, thanks for pointing my mistake!

I have been taking a long look at it on the web, and well, basically I don't even really know how to look for it, lol. So unless some of you know the name of that mostfet in the t092 version, I think I will order the SMD mosfet you said, which if I am not mistaken, is this one: https://www.aliexpress.com/item/3281964 ... xatOI&mp=1
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Re: Charging port.

Post by jhsa » Wed Feb 24, 2021 7:25 pm

MikeB wrote:
Tue Feb 23, 2021 11:04 am

All you need to do is to wire a suitable P-Channel MOSFET across the existing protection diode, source to the charger input, drain to the other side of the diode and gate to ground. You may wish to find a MOSFET in a wired package (e.g. TO92) rather than a surface mount device. Just find one that meets the same specification as the AO3407A.

Mike
Mike, I think that for reverse polarity protection, the Drain will connect to the Charger Input, and the Source to the radio power switch.. Something like this?
JD3LH.jpg
JD3LH.jpg (24.84 KiB) Viewed 1417 times
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Re: Charging port.

Post by MikeB » Wed Feb 24, 2021 8:47 pm

Oops yes, I've edited my post above.
Rad: That would be fine, you may prefer to get the AOD403, shown at the right of that page. This is in a much larger package so will be easier to fit.

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Re: Charging port.

Post by Rad » Thu Feb 25, 2021 8:48 am

Thanks for the diagram, Joao, and thanks for the part, Mike. That should be a very easy and well worth add to my radio.
I am ordering the parts right now.
It seems there is always something else I can add in the radio, which is great! :D
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Re: Charging port.

Post by Rad » Fri Mar 19, 2021 11:54 am

Hi everybody, I have some issues here, and I cannot find the main problem.

I tested charging the radio with a charger I had around here, output 12V 1A, center positive. I checked it for like 3 seconds or so, and the voltage increased in those seconds like 0,1v. Looked like it worked, so I unplugged it.

I did my wires for charging it with the hobby charger, also center positive, I tried to charge the radio, and nothing happened. Well, the charger keeps saying "connection error". I tried with the older charger, and it did not work neither.

I don't know if I fried something there in the quick connection test, but at that point I decided to replace the diode with the mosfet.
photo_2021-03-19_12-45-11.jpg
(138.22 KiB) Not downloaded yet
And at this moment, when switching the radio on, the 9xtreme charger wire melts. Yep I pissed my pants when I saw the smoke.

I must say that 9xtreme problem popped here: viewtopic.php?f=26&t=10530&p=132789&hil ... ls#p132789 (2017, Time flyes!) I am still pretty sure the problem happened when I soldered some taranis gimballs wrong.

Thanks God the radio still seems to work, just that wire I had to place there melts.

What can I do for fixing the mess and being able to charge the radio with the port? I hope I can fix this in time, I have a RC meeting at the weekend!
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Re: Charging port.

Post by MikeB » Fri Mar 19, 2021 12:41 pm

According to the datasheet for the AOD403 I just looked at the connections are, from left to right:
Gate, Drain, Source.
Your picture shows you have the Gate connected where the Drain should be and the Drain where the Gate should be. Note the tab at the top is also the Drain.

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Re: Charging port.

Post by Rad » Fri Mar 19, 2021 2:19 pm

Hi Mike, yep, you are right. I tried this other way but I have some issues:

With the radio On, it does not charge (connection error). Not that is a problem, but just to be sure everything is OK.

With the radio off, the mosfet gets hot, melts the soldering, when charging 1A.

Any ideas? Attached new pic.
IMG_20210319_151736.jpg
(2.7 MiB) Not downloaded yet
Edit: Seems to work when charging 0.5A with radio off! :D
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Re: Charging port.

Post by MikeB » Fri Mar 19, 2021 3:26 pm

Given you had the wire melt earlier, it is likely the MOSFET is damaged. Since the MOSFET has a built in diode, it should never have more than 0.7V across it when charging, which at 1A is only 0.7W, so it should only get warm if it is not turned on. Since it should also turn on, then it should have a resistance of less then 10mohm (0.01 ohm), so only 0.01V across it.

If you have another device, I suggest you change to that.

You could also measure the voltage across it when charging.

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Re: Charging port.

Post by Rad » Fri Mar 19, 2021 3:37 pm

Ok, just in case, I will replace the mosfet.

But quick question, I am charging it with an Imax B6 charger, so I select "li ion" charge in thr menu and the desired Amps. Would it be OK? No idea at how many volts it charges.
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Re: Charging port.

Post by jhsa » Fri Mar 19, 2021 5:57 pm

Oh, wait there, You didn't say you were charging Lithium batteries. I thought you were using some HiMh or NiCad batteries..

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Re: Charging port.

Post by Rad » Fri Mar 19, 2021 6:04 pm

jhsa wrote:
Fri Mar 19, 2021 5:57 pm
Oh, wait there, You didn't say you were charging Lithium batteries. I thought you were using some HiMh or NiCad batteries..

João
Li ion, chip protected, no balance plug.
https://a.aliexpress.com/_mOkcbsf

Something else to consider? Seems to be fine so far...
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Re: Charging port.

Post by Rad » Fri Mar 19, 2021 6:27 pm

Quick update before I replace the mosfet:
As it is right now, it charges the radio when OFF, but does not charge when ON.

This mosfet might be causing an issue too, because when I checked the voltage with a polimeter it said 7,7 volts, and just plugged the charger it says 8.20
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Re: Charging port.

Post by MikeB » Fri Mar 19, 2021 7:38 pm

The power switch does disconnect the charging circuit when the radio is on so that is correct.
What is the voltage across the MOSFET?

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