Is there a way to have something in the middle? I mean Slow charge take 1Amp from the wall charger (either the asus one or any other) even if it can supply 2 or more Amps, and fast charging only works when connected to a Quick Charge 2.0 adapter that I have: is there any kernel that can set maximum current used for charging? It would be nice to use the 2 Amps that the wall charger can supply, even without the quick charge support as many tablets do
i think it will over charge and damage your battery if you do that
Why is that? Quick charge 2.0 specs specify 2 amps for 5v. And other devices can use 2 amps from standard chargers without QC 2.0 support
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gohanSS said:
Why is that? Quick charge 2.0 specs specify 2 amps for 5v. And other devices can use 2 amps from standard chargers without QC 2.0 support
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what makes quick charge is the fact it charges at 5V, 9V, 12V and 20V depending on the device. it starts off at higher voltages when the battery is low and the voltage slowly rolls off to a standard 5v when the battery is near a full charge(i believe the roll off is at 80% battery?)
just thought i would slightly clarify QC, but as for the question i doubt you could do that safely if the hardware was never designed to bring in that much current, you would end up frying traces or something worse.
but some kernels do have the hack that makes it so the phone will always pull maximum amount of designed power by bypassing the data link bridge required to activate that. you see devices have it set up so if the data lines in the usb are not bridged together then the device will only pull a max of something like 1A and that is to protect the item the device is plugged into(like your pc) but when plugged into a usb charging adapter, that adapter might have the data lines internally shorted(or linked) to tell the device that you are not connected to something to transfer data, that your only charging the device and that the phone is free to draw its maximum power.
The problem is that with QC you may get higher voltages in order to decrease the amount of amps and still maintain the same power transferred but before going to the battery voltage needs to be reduced below 5V or it would fry the battery. It's OK to limit current when connected to USB of a computer in order not to damage USB ports that normally can only supply 0.5 amps.
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as we know , for example the wall charger has output of 1A.
and battery capacity is 1750 mAh , so in theory , it should be 100% charged in 1750 mAh / 1000 mA = 1.75 hours.
but consider something like cable resistance or whatever , i think it should be fully charged like 2.5 hours or so ...
but what strange is, i have an old wall charger which was come from with Nexus S , only has 700 mA output and the new one came with Galaxy Nexus which has 1 A output. but my application , DX power booster , charge estimated time shows exact same with both 700 mA and 1 A ... i just don't get it as they have different output current ...
and i think , when charger is plug in, phones runs on power source directly from charger which will decrease the current goes to battery i think , so will the battery charging be short if i shut down my phone when it charges ?
and as for a USB , 5 V and 0.5 mA , which is only half of wall charger , then why does FAST CHARGE will make it as shortly as wall charger ?
because i think , no matter it is on or off , it doesn't alternate the fact that USB still only has 500 mA output ...
maybe they are stupid questions ... but i just failed my physics back the time i was student ...
My Gnex charges WAY faster when it's turned off. A few times I've left the house and realized I forgot to charge my phone overnight so I turn it off, put it on the car charger and usually have a useable charge even if it's a fairly short trip.
If you're phone is off, it's not using the power it's getting from the charger, therefore it will reach 100% faster
Sent from my Galaxy Nexus using xda premium
qtwrk said:
as we know , for example the wall charger has output of 1A.
and battery capacity is 1750 mAh , so in theory , it should be 100% charged in 1750 mAh / 1000 mA = 1.75 hours.
but consider something like cable resistance or whatever , i think it should be fully charged like 2.5 hours or so ...
but what strange is, i have an old wall charger which was come from with Nexus S , only has 700 mA output and the new one came with Galaxy Nexus which has 1 A output. but my application , DX power booster , charge estimated time shows exact same with both 700 mA and 1 A ... i just don't get it as they have different output current ...
and i think , when charger is plug in, phones runs on power source directly from charger which will decrease the current goes to battery i think , so will the battery charging be short if i shut down my phone when it charges ?
and as for a USB , 5 V and 0.5 mA , which is only half of wall charger , then why does FAST CHARGE will make it as shortly as wall charger ?
because i think , no matter it is on or off , it doesn't alternate the fact that USB still only has 500 mA output ...
maybe they are stupid questions ... but i just failed my physics back the time i was student ...
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wall charging is only faster because your phone is not using battery while charging, so of course it would take a shorter time to reach full battery, thus appearing to charge 'faster'.
Fast charge is fooling the phone into thinking your charging from a wall socket instead of a usb, as when in usb mode it uses some of the power to transfer files between the phone and computer, so when in fast charge mode it only charges and cant be used to transfer files. this is from what i understand so far
vincentistan said:
wall charging is only faster because your phone is not using battery while charging, so of course it would take a shorter time to reach full battery, thus appearing to charge 'faster'.
Fast charge is fooling the phone into thinking your charging from a wall socket instead of a usb, as when in usb mode it uses some of the power to transfer files between the phone and computer, so when in fast charge mode it only charges and cant be used to transfer files. this is from what i understand so far
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But what I don't understand is, no matter you transfer files or not, it doesn't alternate the fact that USB output is still 500 mA...
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When you activate Fast charge you fool the USB port to think it doesn't have a communication device attached, and thus can deliver up to 1.5A on the port (dependent on port type). The phone charges faster when turned off because it doesnt use any power itself. The charging board on the phone will always control how much current you can recieve at all times (even when off).
Taken from Wikipedia.
Charging ports and accessory charging adapters
The USB Battery Charging Specification of 2007 defines new types of USB ports, e.g., charging ports.[46] As compared to standard downstream ports, where a portable device can only draw more than 100 mA current after digital negotiation with the host or hub, charging ports can supply currents above 0.5 A without digital negotiation. A charging port supplies up to 500 mA at 5 V, up to the rated current at 3.6 V or more, and drop its output voltage if the portable device attempts to draw more than the rated current. The charger port may shut down if the load is too high.
Charging ports exist in two flavors: charging downstream ports (CDP), supporting data transfers as well, and dedicated charging ports (DCP), without data support. A portable device can recognize the type of USB port from the way the D+ and D- pins are connected. For example, on a dedicated charging port, the D+ and D- pins are shorted. With charging downstream ports, current passing through the thin ground wire may interfere with high-speed data signals. Therefore, current draw may not exceed 900 mA during high-speed data transfer. A dedicated charge port may have a rated current between 0.5 and 1.5 A. There is no upper limit for the rated current of a charging downstream port, as long as the connector can handle the current (standard USB 2.0 A-connectors are rated at 1.5 A).
Before the battery charging specification was defined, there was no standardized way for the portable device to inquire how much current was available. For example, Apple's iPod and iPhone chargers indicate the available current by voltages on the D- and D+ lines. When D+ = D- = 2V, the device may pull up to 500 mA. When D+ = 2.0 V and D- = 2.8 V, the device may pull up to 1000 mA of current.[47]
Dedicated charging ports can be found on USB power adapters that convert utility power or another power source — e.g., a car's electrical system — to run attached devices and battery packs. On a host (such as a laptop computer) with both standard and charging USB ports, the charging ports should be labeled as such.[46]
To support simultaneous charge and sync, even if the communication port doesn't support charging a demanding device, so called accessory charging adapters are introduced, where a charging port and a communication port can be combined into a single port.
The Battery Charging Specification 1.2 of 2010 [12] makes clear, that there are safety limits to the rated current at 5 A coming from USB 2.0. On the other hand several changes are made and limits are increasing including allowing 1.5 A on charging ports for unconfigured devices, allowing high speed communication while having a current up to 1.5 A and allowing a maximum current of 5 A.
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Can someone tell me why is it that when i charge my phone when USB connected to PC its takes hours together to charge and Wall Charger takes 1/4th of that time why is that can anybody tell me what is the login behind it and which is best way to charge ?
USB only outputs 5v, which is why it takes makes longer. You have more power outputted from the ac adapter therefore it charges quicker. Simple as that. They will both eventually charge the device, but it's recommended you use the wall charger all it's faster, no one likes to wait
+1
U cannot compare usb charging with ur charger as output voltage varies across both n btw usb is jst an alternative for charger it's not a replacement
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You can use a custom kernel and change charging current.
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Ok thanks Guys to know what is the main difference
Technically, voltage has little to do with charging. The amperage is what counts. USB on a computer gives ~500 milliamp, where ac chargers give 1-2 amps
Sent from my SGH-I997 using xda app-developers app
For a more detailed answer...
All compatible chargers output the same voltage, 5 volts. (Otherwise they just would burn out the charging circuits in the phone. It can happen both if there's too much volts and if there's too little, but for very different reasons.) However, voltage is not the only characteristic of electricity, the other most important is current, that is, amperes. Think of volts as 'water pressure' and amperes as 'amount of water pumped per minute' through a water pipe -- with real water, those are connected, with electricity they're quite separate.
Every source of stabilized electricity you will find in any kind of power supply will have a set voltage it outputs electricity at, and maximum current it can output. Trying to draw more current than it can supply can damage the power supply, so your phone limits the current it attempts to draw when it detects a standard USB port -- to what the USB standard says it should be able to safely supply. For standard ports, it's 500mA. Galaxy Note II by default plays it safe and draws 425mA. The stock AC charger is rated at 2000mA, and Note draws 1700mA when it detects one. This specifically affects the speed of charging -- AC chargers will charge battery faster, because three times more power gets in.
The USB standard was written before everyone and their mother started using it as a charger, and today, USB ports can usually handle more than 425mA, and on some computers they can supply just as much power as the stock AC charger. There are a few standard ways to detect how much current can a phone safely draw from an USB socket, but not all of them are universally accepted or correctly implemented, so the phone always plays it safe when it can't be sure. If you install a custom kernel, you can directly tell it how much power to draw if you know your USB port can handle it.
:good: :good::good::good::good::good:
aukhan said:
:good: :good::good::good::good::good:
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You can use the app Galaxy Charging Current (GCC) from the S3 thread which can measure the output of the incoming current. It will also allow you to detect faulty cables and chargers, as you will be able to see different ratings with different cables and chargers.
Testing on typical USB ports will get you a reading of 460, while the original charger and a good cable will give you 1800 (about the max current draw for the Note 2).
If you use a known good charger and get a lousy reading, it indicates a bad cable. I once had a cable give a readout of 100. I promptly threw it away.
Yes i am using that thanks nyways
I picked up a wireless charger the other day and when I used it I noticed my phone was pretty hot after. Hotter than normal USB charging. I went to read the manual that came with it and it said the maximum input voltage was 5v and I was using a wall USB outlet that outputs 1000mA which is about 9v , I know that's bad but would have damaged my phone at all or only my wireless charger??
slojko said:
I picked up a wireless charger the other day and when I used it I noticed my phone was pretty hot after. Hotter than normal USB charging. I went to read the manual that came with it and it said the maximum input voltage was 5v and I was using a wall USB outlet that outputs 1000mA which is about 9v , I know that's bad but would have damaged my phone at all or only my wireless charger??
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Neither.
A wireless Qi charger will be warmer overall than corded charging, it's nothing to worry about (try playing a graphically intense game for an hour on the Nexus 5, that's heat).
When the charger says it will take 5V input, that is how much it will draw. For example, if an adapter outputs 12V, that's how much it can provide, NOT how much it is forcing in to a device. So the Qi charger is drawing 5V out of the 9V your USB wall charger can provide. The other 4V aren't utilized.
Same concept for example on a desktop computer. If you have a 1000W power supply and your computer is in sleep mode, you power supply is not shoving 1000W forcefully through the computer. So your computer is using like 100W and the remaining is available when needed but not active.
Don't worry, you're all good.
Sorry but that's not correct.
If you have a device which is rated with a voltage of 5V and you connect a power supply with 9V you could damage this device.
The voltage has to be correct. Always!!!
The max current of the power supply can be higher than the rating on the device.
For example your original charger says 5V 1A. You can use a charger with 5V and 3A. Your device will draw only as much current as necessary.
But the voltage always has to be correct.
In case of the qi charger:
If you power the qi charger with 9V instead of 5V you could kill the charger, but not the telephone.
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How did you get 9v? In North America mains outlets provide about 120v and in Europe they output about 230v. That being said, I would think that the ac adapter that came with the charger would reduce the voltage to within the needed range (~5v). I'm no electrical engineer though, so someone correct me if I'm wrong...
Sent from my Nexus 5
premo15 said:
How did you get 9v? In North America mains outlets provide about 120v and in Europe they output about 230v. That being said, I would think that the ac adapter that came with the charger would reduce the voltage to within the needed range (~5v). I'm no electrical engineer though, so someone correct me if I'm wrong...
Sent from my Nexus 5
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Yeah I think all usb chargers are 5v
Sent from my SPH-L900 using XDA Premium 4 mobile app
picard782000 said:
Sorry but that's not correct.
If you have a device which is rated with a voltage of 5V and you connect a power supply with 9V you could damage this device.
The voltage has to be correct. Always!!!
The max current of the power supply can be higher than the rating on the device.
For example your original charger says 5V 1A. You can use a charger with 5V and 3A. Your device will draw only as much current as necessary.
But the voltage always has to be correct.
In case of the qi charger:
If you power the qi charger with 9V instead of 5V you could kill the charger, but not the telephone.
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That's what I meant, my wording was just incorrect. His USB wall adapter was not forcing a higher voltage, but providing more available power if necessary.
Can anyone with a Find7a let me know what the spec of the vooc charger is? They don't seem to sell them separately on the Oppostyle website and I usually like a second charger for work.
Thanks
Have it at home and am in the office (i get your point xD)
But i read in another thread, that it has extra pins for full power charging. Without that extra pins you dont get full speed charging.
4.5 amps instead of the usual 2 you see on the market.
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lexo said:
Have it at home and am in the office (i get your point xD)
But i read in another thread, that it has extra pins for full power charging. Without that extra pins you dont get full speed charging.
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That's annoying. I was hoping it was just a higher amperage. They sell N1 chargers on http://europe.oppostyle.com but not Find 7a ones.
The 4.5 amps are reached by having multiple power lines on hidden extra pins.
So yeah, vooc is proprietary, no way around it.
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But if we are already talking about the charger i have two questions as well.
My overall understand of charging and power tells me, if i plug the vooc charger in another phone it will load with the amperage the other phone accepts. So there should be no damaging - right? I dont feel ready to test it without asking you before that
The other way around, using my old charger with me Find 7 should work fine as well, shouldnt it? Of course with even longer loading time depending on the power of the charger. This night I tried charging my Find with an old charger of my Galaxy Nexus (I think something around 1A which worked well with my Nexus 4). I expected it to load waaay slower. But actually it didnt load at all. I am not absolutely sure at wich perantage i started, but after about 8 hours i got no remarkable change, maybe a few percent. Is there a minimum Amperage needed?
Thanks for your thoughts
You are correct.
The extra voltage is pumped out via additional pins that a normal USB connector doesn't have.
The other way around you can of course charge the find7 using conventional USB chargers, just slower of course.
As for minimum amps... All my other chargers give me 2 amps and that works.
Also charging on my computer via a USB port works great... Those output I think only 500ma...
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If you plugged the VOOC supply into another phone it shouldn't cause electrical damage - but the extra pins on the charger COULD get damaged.
It's more than just the extra pins - the VOOC power supply uses two pins (possibly D+ and D-) to communicate with the phone.
You'll get normal (but fairly rapid, I need to check but I think it's at least 1.5A) charging using a standard MicroUSB charger.
Edit: Can't find the exact settings, but the charger chipset supports settings of 3A, 2A, 1.5A, 1.2A, and some lower settings. Stock is probably 1.5A or 1.2A
That's some good info there so thanks guys.
It still begs the question, how do you get hold of spare or replacement vooc chargers?
Hi,
I have several power banks, each with different capacity.
I've noticed that when I connect my nexus to a 1A port, it says "charging (ac)",
but when I connect to the 2A port, it says "charging (usb)".
The usb charging (2A) is slower than the 1A charging.
Though I can understand why usb charging is slower than AC charging,
I don't understand why EVERY 2A charger has to be a usb charger?
Thanks in advance!
On my Anker it is AC. It has a total 3A output, with the N5 using approx 1-2A I think. Check your charging cable quality, it does matter on power banks!
Envoyé de mon Nexus 5 en utilisant Tapatalk
Hi,
tried different cables and different power banks.
Can you confirm that you use A 2A port and it charges as AC?
Or are you using 1A port?
Shortcut The 2pins in The middle of The USB connector it will detect AC. I made a small plug for that
i have xiomi 2A powerbank and it shows AC
That means that your power banks are all designed for Android phones on the 1A port and iDevices on the 2A port. Basically, iDevice chargers put a voltage across the data pins to tell the device what rate the charger supports, while all other devices just short the data pins. You can get a charge only cable to get around this:
http://www.amazon.com/PortaPow-Micr...TYUE/ref=sr_1_1?ie=UTF8&qid=1413824051&sr=8-1
Newer chargers and power banks are starting to ship with what they call "smart charging" or "IQ charging," which allows you to get the full charge rate out of any port without a charge only cable.
Thank you very much, this is exactly the answer I was looking for!
Last question -
I wonder how was I supposed to know that from the specs?
This is the one I have:
http://www.amazon.com/gp/aw/d/B00D5...1bfeb4a078d18d4935a3&pi=SS115#ref=pd_aw_sbs_4
Thanks!
danagu said:
Thank you very much, this is exactly the answer I was looking for!
Last question -
I wonder how was I supposed to know that from the specs?
This is the one I have:
http://www.amazon.com/gp/aw/d/B00D5...1bfeb4a078d18d4935a3&pi=SS115#ref=pd_aw_sbs_4
Thanks!
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Click to collapse
Well, it's not a hard and fast rule. Some Android tablets will only charge off the 2A port even though that's the Apple standard. The manual for the battery itself says "refer to your device's manual to determine the proper port" which is a bunch of BS. When that battery pack first came out most Android phones still came with a 0.8A-1.0A charger, and the iPad and other tablets were the only devices that needed higher powered chargers. The newer models of it (http://www.ianker.com/product/A1208011) use the "smart ports" that will charge any device on either port at their maximum rate.