I have a usb type in car charger for my psp rated at 5v 2amp, could I use this on my Vario (wizard)?
will the extra 1 amp matter?
My mains plug for the vario is rated at 5v 1 amp.
thanks
In a electronic engineer theoritical point, it does not matter that the charger is able to provide the extra 1 amp. It should work since both has the same voltage. The basic equation is V = IR, which if you have the same voltage and resistance, the current will be adjusted automatically. For example, the wall socket on your house gives you 240V (e.g. UK standard) and able to give you 13A, hence the rating is 240V 13A. However, this same socket is able to act as a power supply for things rangers from the low power consumption (e.g. clock) to power hungry ones (e.g. kettle). These appliances uses the same voltage 240V but they adjust (automatically) the power by having lower current (e.g. clock = 0.1A, kettle 12A).
However, I'm not sure hows the HTC design in terms of safety. The 1amp condition will become a concern IF there is a problem with your phone. Example, if you have a defective battery, the 2amp charger will have the phone exploded in twice the speed as compared with the 1amp charger.
Anyway, 5V 2A = 10W is a low power rating. My comment is, there is a low accepted risk involved, but it should work with your phone. My advise would be, charge your phone with your default charger, sense the phone's temperature and function. THEN, go charge (later when you need charging) your phone with the 2A charger, and make sure that the phone is within the similar condition it has when charging with the default charger. It is just a precaution incase of any 'defects' on your phone. But, in most cases, if your phone works normally with your default charger, it should not have problems on the 2A charger.
Ask if you want to know more electrical stuff
Thanks,
What does the usb on a pc give?
It charges fine on this, I dont really use the wall charger.
As according to
http://www.beyondlogic.org/usbnutshell/usb2.htm
USB allows up to 0.5A of current. So, you are looking at 0.5A current from USB, but the standard charger is 1A.
Ok, thanks for your help, I'll give it a go if its an emergency!
I notice that the standard AC/Charger is 0.7A output. Possible to use another AC/Charger rated at 1.0A output? What is the USB output anyways? Thanks in advance for any help or suggestions.
PS Still considering rooting or not (will it void my warranty?) *WUSS*
I am using my Galaxy Tab 2.5A charger to charge the S2. It still takes about the same amt of time to charge up full.
I believe the charger current rating is the max current it can supply. The S2 will still draw current at it's own max...maybe 0.7A.
Doesn't matter what charger you use on it, if it's greater than 0.7A The S2 will limit itself to 0.7A.
if you want raise charging amperage, you can help me looking for someone, who will change(raise) it in kernel...
http://forum.xda-developers.com/showthread.php?t=1132649
Given the same voltage (i.e 5V for USB), it's the resistance of the phone that determines how much current is drawn from the charger. Therefore anything above the rated 0.7A would work fine and dandy.
Thanks to all the fellas that responded! More than enough information provided.
Sent from my GT-I9100 using XDA App
The standard for usb is 500mA/5v and this is what you get out of most computers, usb hubs and so on. AC to usb chargers will also run at that more often than not. AC chargers on the other hand usually run hotter, up to 1A and more. I have a 1A and a 1.5 amp and both charge this phone at exactly the same rate. It was not so with my N1 where the 1.5 was quite a bit faster, certainly appears like there is throttling going on as others stated. I would be curious why they did this when some other ODMs are selling phones with 1A and higher rated chargers.
look in the source code, wall charging is capped at 650 mA and USB is capped at 450 mA. and this makes sense why samsung included a 0.7 Amp charger.
Anybody tried to use standart HTC 5V wall charger for Flyer?
I have HD2 and its charger can safely give 1A. This type of chargers have USB data pins shortened. So all HTC devices conneced by standart USB cable identifies it as AC charger. I have tried to connect Flyer for a half a minute. Charger was identified as AC and as I remeber (not shure...and afraid to test once more) Flyer was sucking more than 1A (Battery monitor pro).
Flyer AC charger is 9V 1.62A, standart charger 5V 1A so question is do Flyer detects difference between Flyer charger and Standart 5V charger? Is it safe and possible to use standart 5V charger?
yes you can use standard USB, it will just charge slower
DigitalMD said:
yes you can use standard USB, it will just charge slower
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Click to collapse
Have you tried or you just think so?
If flyer tries to get more than 1A, yes it will charge slower, but it will also burn charger.
I charge with reg usb all the time
Sent from my PG86100 using XDA App
I do it routinely. The device cannot draw more than the usb port will supply. PC ports supply only 0.5 amp. So they will only work if you turn the power off the Flyer. Wall chargers vary, some supply 1 amp. The original is 9v 1.6 amp were usb chargers typically are 5v so they will charge slower, much slower in some cases.
DigitalMD said:
I do it routinely. The device cannot draw more than the usb port will supply. PC ports supply only 0.5 amp. So they will only work if you turn the power off the Flyer. Wall chargers vary, some supply 1 amp. The original is 9v 1.6 amp were usb chargers typically are 5v so they will charge slower, much slower in some cases.
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Click to collapse
Sorry for last several anoying questions. Just want to be shure.
1. Do you use HTC charger or other vendor? In most cases only HTC 5V chargers are identified as 1A AC chargers. If not - device will not request more tha 500ma in order not to burn USB port (device thinks that it is port in that case)
2. Did you see that Flyer identified charger as AC source?
3. Did you charge when battery was less than 10%, what was charge current value on Flyer
Ok, now its getting annoying, did you actually read the information I put in the post you quoted? You just ask me the same questions I already answered.
The chargers all run on AC and produce DC . Flyer original output is 9 Vdc 1.6 amp .
DigitalMD said:
Ok, now its getting annoying, did you actually read the information I put in the post you quoted? You just ask me the same questions I already answered.
The chargers all run on AC and produce DC . Flyer original output is 9 Vdc 1.6 amp .
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Sorry but I think you did not gave the anwer. My english is not so good so maybe the question was not clear. I will try to explain once more, it is up to you to answer or just end this conversation/thread if you think i asked same stupid question once more.
1. Usually non HTC 5V chargers on HTC devices are identified as USB port and thats why devices draws no more than 500mA. It made so no to burn USB port.
2. All 5V HTC chargers on HTC devices are identified as AC 1A, so devices try to get as much as thay can (usually phones request less than 1A).
3. HTC Flyer with empty battery can request no more than 9*1.6A=14.4W. Flyer charger can handle that. Standart can handle only 5*1A=5W.
The question was: do 5V 1A HTC charger will not burn because Flyer identifies charger as AC and can request more than 1A. USB ports usually have protection from current. I do not know if 5V HTC chargers has protection or do Flyer identifies difference between 9v and 5v chargers and sets max current it can get from charger?
extra pins not present on a usb cable for mains charging. if using usb cables the the flyer is a usb device and has the same power restrictions as any other device...simple as that.
globatron said:
extra pins not present on a usb cable for mains charging. if using usb cables the the flyer is a usb device and has the same power restrictions as any other device...simple as that.
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You are not right.
HTC 5V HTC mains charger comes with standart USB cable with no extra pins. Thats true. But mains charger has Data+and Data- shortened inside what makes HTC phones think that it is mains... with any USB cable. So power restrictions will not be as for USB....but as for AC. I have tested that in practice. I made belkin car charger and iphone charger able to be treated as mains chargers just by connecting pins (iphone charger data pins should be disconnected from schema before connecting. I have secret how to connect pins without opening unopenable iPhone charger....).
So the question is Flyer is able to identify mains 5V1A and 9V1.6A difference and do it apply different restrictions. Now for both shows it as AC source and I think sucks as much amps as it can up to 1.6A. So teoretically it should burn 5V charger if it will suck more than 1A.
What are you trying to do exactly?
---------- Post added at 06:29 PM ---------- Previous post was at 06:28 PM ----------
by the way, it is standard, not standart.
I use the Flyer with a variety of USB wall chargers, car chargers and PC ports and have never experienced fire or explosion, only charging and slow charging. Are you trying to figure out how to use a different charger and still get a rapid charge rate?
Ok, I think I understand what the question really is but it is poorly phrased.
On my previous statement I agree with your answer in terms of how it is possible to read what I had said, in fact probably the logical way to read it on re-reading what I wrote, what I meant was electrically present, not that there were extra physical pins, whether electrically present is hi or lo doesn't matter.
If the question is can you rapid charge at 5V from a sufficiently powerful 5v then the answer is no, even if you pull D+ and D- to ground. Also it is highly likely that in the AC charger a resistor rather than direct connection is used to pull them to ground and these resistors could be electrically significant in the overall charging circuit.
The most probable reason for this is that there are two parallel charging circuits in the flyer ( almost certain of this ), and hence why 9v is used. The charge voltage for a 3.7v battery is 4.2 volts and somewhere around 500-750mA, the second charging circuit will have an isolation circuit to ensure that it is only engaged for charging purposes and does not directly feed the tablet that would be the purpose of the modified connections of d+ and d-, activate the secondary charging circuit.
Assuming you feed the device 5v from usb that would mean that the second circuit would receive a 0.8v supply, probably (hopefully) not enough to activate it so you just burn up the extra as heat in the circuit. In theory you would see a higher current draw by asking the flyer to run as if it was connected to an 9v supply when you connect a 5v supply. Best and most likely case scenario you're just being inefficient, medium case you burn out a component or protection (eg thermal fuse), worst case scenario you reverse the battery and it gets damaged or explodes.
globatron said:
Assuming you feed the device 5v from usb that would mean that the second circuit would receive a 0.8v supply, probably (hopefully) not enough to activate it so you just burn up the extra as heat in the circuit. In theory you would see a higher current draw by asking the flyer to run as if it was connected to an 9v supply when you connect a 5v supply. Best and most likely case scenario you're just being inefficient, medium case you burn out a component or protection (eg thermal fuse), worst case scenario you reverse the battery and it gets damaged or explodes.
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This is what i meant! I was curious which one of scenarious will happen in practice.
From DigitalMD post above I can make a conclusion that in reality we will have 1st scenario (just inefficient).
Thank you guys.
I recommend you look at the following USB battery charging spec. A properly designed charging circuit will have current limiting and can recognize the power capabilities of the port vs. device vs. cable. This is why some charging circuits use a special cable vs. a standard USB data cable.
http://www.usb.org/developers/devclass_docs/Battery_Charging_V1_2.zip
Nice link, it's got some pretty decent information in it.
Honestly to answer your previous question I can't tell, I'm guessing nothing except some heat, but that doesn't mean that you couldn't thermally damage something ( eg the screen ).
globatron said:
Nice link, it's got some pretty decent information in it.
Honestly to answer your previous question I can't tell, I'm guessing nothing except some heat, but that doesn't mean that you couldn't thermally damage something ( eg the screen ).
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Click to collapse
I think that there is no chance to damage Flyer thermally But theoretically, if Flyer wll requests more than 1A charger can overheet and possibly damage the Flyer. But if Flyer can detect that charger as 5V1A and if it can request less than 1A, then it is safe. Also if charger can detect current higher than 1A and can limit it - that also should be safe to use it.
I will read pdf maybe there will be some good info.
I use a self powered usb hub as a daily charger for both my Flyer and Kindle. Works fine. With no "burning out". At work, I use a generic 5v 1a charger, no problems either except for charge speed...
The charge state shows USB instead of AC, so it appears there is some sort of voltage/amp sensing going on?
Sent from my Nexus One using Tapatalk
kardain said:
I use a self powered usb hub as a daily charger for both my Flyer and Kindle. Works fine. With no "burning out". At work, I use a generic 5v 1a charger, no problems either except for charge speed...
The charge state shows USB instead of AC, so it appears there is some sort of voltage/amp sensing going on?
Sent from my Nexus One using Tapatalk
Click to expand...
Click to collapse
Your flyer identifies charger and hub as USB and limits current to 500ma. The initial discussion was about the case when 5V1A charger is identified as AC. This case happens when standart htc phone charger is used (eg HD2 charger). That charger has data pins shortened inside that makes HTC phones (conected by standart USB cable) think that charger is AC. Surprisingly Flyer identifies it also as AC. In that case flyer do not limit current and possibly tries to draw 15W from 5V charger which can deliver only 5W ! I think that good chargers should have protection from oveload....
So soldering data pins together in you generic charger would make it more efficient. I modified my all generic chargers even genuine iphone charger and now all HTC and possibly other phones identify them as AC !! But I still not shure is that safe for flyer.
Little bit offtopic:
Yesterday i dissasembled Griffin car charger thas has 2x1A USB ports. In fact there is a chip inside that can deliver up to 3A. The chip is XL1583E1. This chip can be set to deliver other voltage than 5V by changing resistor.
It would be nice to get somewhere flyer pinouts and see if it uses the same pins for 5V and 9V charging. If the same - it means that this car charger can charge flyer as fast as flyer mains charger just coupling data pins (now it has identifications circuitry for iphone -resistors between vcc,data,data,vdd). If not - it means that charger shoud be modified to deliver 9V and special cable with extra pins will be needed also.
you sure are going through a lot of contortions just to do same things that the HTC charger that comes in the box already does. Why not use the adapter made for the device?
Can the charger bundled with the Galaxy S4 'fast charge' other phones, or is it something to do with the phones/batteries themselves that allow the quick charging? I heard that the charger charges at 2amp as opposed to 1amp like most chargers. I dont want to explode someones phone battery because it cant handle being charged that fast, lol
shanimal92 said:
Can the charger bundled with the Galaxy S4 'fast charge' other phones, or is it something to do with the phones/batteries themselves that allow the quick charging? I heard that the charger charges at 2amp as opposed to 1amp like most chargers. I dont want to explode someones phone battery because it cant handle being charged that fast, lol
Click to expand...
Click to collapse
im using an aftermarket car charger with a random micro usb and it charges just as fast...i think its the phone/battery that allows fast charging
Using a 2A charger on an older phone won't hurt the phone. The phone will only draw 1A or however much current it's setup for, even if the charger is capable of delivering more.
Other devices will pull the full 2A from the charger if they can detect that the charger is of the right type to deliver it. Different chargers tell the device that in different ways. Apparently, Apple tablet chargers put a certain voltage across the data pins. Samsung high current chargers supposedly put a different voltage across the data pins. That is how the phone or tablet can tell what kind of charger it's connected to, so they will know whether to pull 2A, 1A, or 500mA (or whatever).
Hi!
I have a doubt, these type of USB-C --> USB-C charger can charge the S8+ quickly than the original charger provided with the device?
http://www.sony.com.sg/electronics/portable-charger-accessories/cp-ad3
I know that S8+ is not use the USB-C charging protocols and use Samsung AFC, because this my doubt if buying this will be a improve or only a waster of money.
Thanks!
I doubt that charger will be any faster than the Samsung provided charger.
Thanks, I get one to make some test. I install the Ampere app, I don´t know if this app is a nice measure tool, but is almost the same that original charger, also a bit faster. Original in test charger session show in the Ampere app a max of 990mA, and this Sony 1020-1100mA on different sessions on both.
I'm cool with the stock charger. I'm not trying to make my phone explode and burn my house down. I'll stick with Samsung's recommendation. Just because you CAN do something doesn't mean you SHOULD.
Original Samsung charger will charge your device at 9v whereas the Sony charger will only charge at 5v, however the new USB c standard allows 3A charging so the power you get from both chargers will be very similar. I use both types of charger and find it hard to find much difference in charge times. Ampere can't be used accurately as it's only showing the charge current not voltage and you need both to calculate power and compare the 2 accurately.