Hummina Shadeeba
1 MW
was titled "why 5 volts chargers are made" and not a typical lithium cell max voltage? But the real purpose is making an induction charger with off the shelf parts. the end of the thread i have what seem best so far
help me with my induction charger please!
- Thread starter Hummina Shadeeba
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Sunder
10 MW
The same reason that the width of our roads and rail tracks is roughly the same as the width of two horses butts. Engineering for legacy applications 
The USB specification was published in 1994. While Lithium Ion batteries existed then, they weren't in mass produced smart phones at the time. In fact, the first specification limited current to 500ma, as there was no intention of using USB to charge. It wasn't until 2007 that the specification was updated to allow currents higher than 500ma to be negotiated through the data lines.
The USB specification was published in 1994. While Lithium Ion batteries existed then, they weren't in mass produced smart phones at the time. In fact, the first specification limited current to 500ma, as there was no intention of using USB to charge. It wasn't until 2007 that the specification was updated to allow currents higher than 500ma to be negotiated through the data lines.
dogman dan
1 PW
So it cooks your battery sooner. then you buy a new phone. :lol:
Nearly that way sometimes,, I had a charger that put the lithium battery in a cheap phone to 5v every charge. Great run time at first,,, It ate two batteries a year. This is where "run it till it's empty, then charge" comes from. It was true for that phone, every charge was damaging the shit out of the battery. So charge seldom was the thing for that phone.
They do charge phone batteries higher than 4.2v though, for the extra capacity. But not all the way to 5v usually. I have no idea,, but I assume there is a bms in a good phone, that cuts off the charge at 4.3v, or whatever, vs going all the way to the wall wart or USB 5v.
Pushing 5v vs 4.2v from the charger is of course a faster charge when the battery is empty.
Nearly that way sometimes,, I had a charger that put the lithium battery in a cheap phone to 5v every charge. Great run time at first,,, It ate two batteries a year. This is where "run it till it's empty, then charge" comes from. It was true for that phone, every charge was damaging the shit out of the battery. So charge seldom was the thing for that phone.
They do charge phone batteries higher than 4.2v though, for the extra capacity. But not all the way to 5v usually. I have no idea,, but I assume there is a bms in a good phone, that cuts off the charge at 4.3v, or whatever, vs going all the way to the wall wart or USB 5v.
Pushing 5v vs 4.2v from the charger is of course a faster charge when the battery is empty.
skeetab5780
1 MW
Cell phone chargers are just 5v power supplies. The charging is controlled inside the device itself. Similar to a laptop power supply. I use a 12v psu to charge my 3s 18650 pack for my heated jacket it works good since it only puts out 12v constant so 4v per cell. It wont have any problems unless a cell group fails.
12V car batteries are charged up to 13V using a 14V alternator. The final charge voltage is controlled by the voltage regulator. Higher voltages being used to overcome system resistance is common practice. Also...the electronics that control the end result actually work off of 5V.
just had a flashback from my first Motorola cell phone... with nimh battery lmao.... oh wow..
dustNbone
10 kW
5 volts has been somewhat of a standard for low voltage computer stuff for many decades and USB was intended to be a low cost interface to replace a bunch of other legacy interfaces (RS232, Parallel Port, etc). Since every computer already had a 5V power supply available, that's what we got.
Smart phones came along about a decade later.
Smart phones came along about a decade later.
Hillhater
100 TW
^^^+1... This is the key thing to remember. They are not chargers, just 5v power supplies.skeetab5780 said:
Hummina Shadeeba
1 MW
bummer. so if i want to use this to charge a cell:
https://www.adafruit.com/products/1407
and it only puts out 5v.
do I have to add something like this somehow:
http://www.mouser.com/Texas-Instruments/Semiconductors/Power-Management-ICs/Battery-Management/BQ2000-Series/_/N-wnwk?P=1yyqrzgZ1z0zls6
that part, getting to the appropriate cc cv or whatever for lithium, is the final step on that side. And just need to get the 120 ac down to 9-12 v dc on the supply side
these things will charge at half an amp. do my whole 12s pack at 300watts. thats the goal. never touch a plug again.
https://www.adafruit.com/products/1407
and it only puts out 5v.
do I have to add something like this somehow:
http://www.mouser.com/Texas-Instruments/Semiconductors/Power-Management-ICs/Battery-Management/BQ2000-Series/_/N-wnwk?P=1yyqrzgZ1z0zls6
that part, getting to the appropriate cc cv or whatever for lithium, is the final step on that side. And just need to get the 120 ac down to 9-12 v dc on the supply side
these things will charge at half an amp. do my whole 12s pack at 300watts. thats the goal. never touch a plug again.
Sunder
10 MW
Doable, but not with off the shelf components, and prepare ro pay big. 44v @ 300w? You're talking 7amps through induction. That's a pretty beefy coil you're going to need.
Hummina Shadeeba
1 MW
yea i have the power potential of these things i posted wrong. much less power output
half an amp. so to fill my 5ah battery it would take 6 hours.
half an amp. so to fill my 5ah battery it would take 6 hours.
Hummina Shadeeba
1 MW
but what about this one:
http://www.ti.com/product/bq51050b/samplebuy
trying to do it with all off the shelf parts.
charges a 1.5 amps per cell and does the cc cv stuff for lithium. so with 12s I'd get my 70 watt charging. not bad. but I don't know what to do next now that I found that part.
http://www.ti.com/product/bq51050b/samplebuy
trying to do it with all off the shelf parts.
charges a 1.5 amps per cell and does the cc cv stuff for lithium. so with 12s I'd get my 70 watt charging. not bad. but I don't know what to do next now that I found that part.
Alan B
100 GW
Study the datasheet.
Make a design.
Make a schematic.
Select the parts.
Make a circuit board.
Learn to solder surface mount parts.
Make a prototype.
Test it.
Make changes as needed.
Repeat till done.
There's quite a bit to a project like this.
Make a design.
Make a schematic.
Select the parts.
Make a circuit board.
Learn to solder surface mount parts.
Make a prototype.
Test it.
Make changes as needed.
Repeat till done.
There's quite a bit to a project like this.
Hummina Shadeeba
1 MW
more than I want to do, but the cc cv thing for the lithium, is it necessary since the induction coils would only be able to transfer 1.5 amps per cell maximum anyway? Id think as soon as the the current is passed to the secondary coil, rectified, and smoothed maybe, it would charge fine and stop charging once it reached the source max voltage of 4.2. do you really need cc and cv with a big battery while limited to a small current as with induction coil charging?
Hummina Shadeeba
1 MW
http://www.ebay.com/itm/Universal-QI-Wireless-Charging-Charger-Receiver-Module-f-Micro-USB-Mobile-Phone-/311782036241?hash=item4897a85311:g:1PEAAOSw-CpYBxgI
http://www.ebay.com/itm/Qi-Wireless-Charger-PCB-Circuit-Board-With-Coil-Charging-Pad-for-DIY-Arduino-/201337845121?hash=item2ee0abb581:g:4bMAAOSwv0tVPEFd
http://www.ebay.com/itm/like/192062981237?lpid=82&chn=ps&ul_noapp=true
almost all the ingredients necessary.
http://www.ebay.com/itm/Qi-Wireless-Charger-PCB-Circuit-Board-With-Coil-Charging-Pad-for-DIY-Arduino-/201337845121?hash=item2ee0abb581:g:4bMAAOSwv0tVPEFd
http://www.ebay.com/itm/like/192062981237?lpid=82&chn=ps&ul_noapp=true
almost all the ingredients necessary.
Read the teklektik 2wd yuba mundo thread. He used individual chargers for each P-string (large Headway cylinders)
Alan B
100 GW
The current and voltage must be limited for safety.
This is the generic type of charger Teklektik used (one for each series cell group):
http://www.ebay.com/itm/XINY-AC-DC-4-2V-1A-Adaptor-Lithium-Battery-Charger-Single-string-polymer-battery-/132024307021
They get warm so leave plenty of space and good airflow is recommended. Electronics last longer when they are run cool.
This is the generic type of charger Teklektik used (one for each series cell group):
http://www.ebay.com/itm/XINY-AC-DC-4-2V-1A-Adaptor-Lithium-Battery-Charger-Single-string-polymer-battery-/132024307021
They get warm so leave plenty of space and good airflow is recommended. Electronics last longer when they are run cool.
Hummina Shadeeba
1 MW
thanks for the info. that part is a bit expensive, but this one for 1$:
http://www.ebay.com/itm/like/192062981237?lpid=82&chn=ps&ul_noapp=true
it does half the current and needs to be fed 5v but will work well with the induction coil set up which this project is all about. the whole setup, for an induction charger for 12s, is reallllly cheap for everything.
http://www.ebay.com/itm/like/192062981237?lpid=82&chn=ps&ul_noapp=true
it does half the current and needs to be fed 5v but will work well with the induction coil set up which this project is all about. the whole setup, for an induction charger for 12s, is reallllly cheap for everything.
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