I got these TP4056 modules from an AliExpress vendor and fail to understand how the protection circuit works or if it’s just typical Ali shovelware. It could be my limited understanding of electronics....
Yes that I found as well but have/had trouble understanding why it would be built like this. Also why a MOSFET would be designed internally like this. If you want more power capability you’d get a bigger MOSFET rather than two tiny ones in parallel right?
It’s related to the internal body diode of the N channel mosfet, so two of them are in series but reversed. When one MOSFET is activated, current may flow easily in one direction but be reduced by the body diode of the other. When both are activated, current may flow easily in either direction.
It seems they don’t really prevent discharging or charging separately due to the body diodes but they can cut off the battery alltogether.
Since MOSFETs have a gate capacitance you’d want to limit the inrush of current from the output of a microcontroller to prevent it from getting damaged prematurely. That’s what gate resistors are usually good for....
That’s good. My switching frequency is a few times per hour.
I am a little bit concerned that the slow rise/fall time make the MOSFET go outside its operating parameters for a fraction of a second. The resistance gradually changes meaning the mosfet will dissipate more power but also less current will flow.
So if you switch many times per second the gate capacitance with the resistor acts as a low pass filter reducing the gate voltage.
2024 is the Year of Linux on the Desktop, at least for my boyfriend. He’s running Windows 7 right now, so I’ll be switching him to Ubuntu in a few days. Ubuntu was chosen because Proton is officially supported in Ubuntu.
This is a $1 dollar increase from what I was paying. But soon subscribers will be $15/month, then $20/month. I wonder how much of deezer’s income actually goes to the artists.
Yeah true. I went through the arch process to learn about Linux though so it was worth it in the end but I still have no clue about selinux, apparmor etc that are shipped by default in other distros. Also the need for firewalls/antivirus which isn’t really an issue in Linux but still.
Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One...
Thanks. I ordered the 24V model in hopes of adjusting it down to 22V. I will use that to keep a 7s Li-Ion battery at a minimum charge level whereas a solar panel array may increase that voltage higher. It looks like the 24V model’s capacitors need to be changed as well since they can’t handle the Li-Ion batterys’ max charge voltage.
Well there certainly is some regulation because attaching a load does not decrease the voltage by much. Increasing the voltage is indeed ambitious for the 12V model but lowering the voltage of the 12V model seems doable.
Replying to myself for informational reason. Modifying voltage was more or less successful. Both optocouplers transmit a reference voltage, so both need to be adjusted simultaneously.
This can be done by changing the value of R19, a 23.2k smd resistor close to the output terminals.
I’ve attached a 10k pot with a 10k and 6.8k resistor in series and successfully modified the voltage down to 22.5.
The power supply itself is a piece of crap though. It claims to handle 400W but anything over 150W causes the short circuit protection to activate, never mind overheating at 150W very quickly.
I have a 3D printer and have a special filter that has two 24V blower fans that are connected in parallel. Unfortunately my printer doesn’t have the proper connectors for the fans. So if I purchase something like this power jack adapter I know the adapter is 12V not sure if that would make a difference. Anyway if I connect the...
Yeah don’t worry about it. Running a fan at a lower voltage than it’s meant for will result in slower fan speeds and a longer lifetime. Compared to the wattage an actual laptop will draw this is absolutely nothing. I power my soldering iron with an old laptop charger without issues.
Those plugs are generally used in 12V systems but they can handle higher voltages too. It’s the current you need to be mindful of for the most part, they can overheat if you try to power a space heater or something from that but a few fans won’t cause any issues.
TP4056 useless protection circuit? (discuss.tchncs.de)
I got these TP4056 modules from an AliExpress vendor and fail to understand how the protection circuit works or if it’s just typical Ali shovelware. It could be my limited understanding of electronics....
What is a nifty little feature modern gadgets have lost? (lemmy.world)
For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
MOSFET gate resistor
Since MOSFETs have a gate capacitance you’d want to limit the inrush of current from the output of a microcontroller to prevent it from getting damaged prematurely. That’s what gate resistors are usually good for....
She was right in 1992, the Catholic Church is still filled with pedophiles. (lemmy.world)
Year of Linux on the Desktop (lemmy.world)
2024 is the Year of Linux on the Desktop, at least for my boyfriend. He’s running Windows 7 right now, so I’ll be switching him to Ubuntu in a few days. Ubuntu was chosen because Proton is officially supported in Ubuntu.
It's funnt because it's true (fanaticus.social)
Using the "frog in boiling water" technique (lemmy.world)
This is a $1 dollar increase from what I was paying. But soon subscribers will be $15/month, then $20/month. I wonder how much of deezer’s income actually goes to the artists.
Linux mint = best beginner distro (lemmy.ml)
Rollin'! Rollin'! Rollin'! (slrpnk.net)
Listen, Susan. It's a valid theory, just look at the damn thing. (mander.xyz)
Why not? (media.mas.to)
Adjusting SMPS output voltage (discuss.tchncs.de)
Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One...
Because it's almost time (feddit.nl)
Merry KREE-mas everyone.
Is it safe to use a laptop charger to power two parallel 24v fans?
I have a 3D printer and have a special filter that has two 24V blower fans that are connected in parallel. Unfortunately my printer doesn’t have the proper connectors for the fans. So if I purchase something like this power jack adapter I know the adapter is 12V not sure if that would make a difference. Anyway if I connect the...
You have more fun with the FPS counter off (poptalk.scrubbles.tech)
What are some companies that deserve to be boycotted to death?
So far my list includes Comcast, EA, and Nestle. Tell me yours, and I’ll help out.
Tech workers - what did your IT Security team do that made your life hell and had no practical benefit?
One chestnut from my history in lottery game development:...