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Windows 7: USB Power Output

13 Aug 2011   #1
jamiedolan

windows 8 64
 
 
USB Power Output

HI;

I'm trying to figure out if the USB ports on my Sony Vaio VPC CW17FX output at full power all the time or if there is a setting with the energy saver.

I'm trying to figure out if my phone charges slower via the USB on my Vaio vs the wall.

It's my impression that USB ports on newer hardware have enough power to charge the phone as fast as the wall?

But I don't know if these are full power ports being a Laptop and / or if there are any energy saver type of programs in place that may limit it.

Thanks
Jamie


My System SpecsSystem Spec
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13 Aug 2011   #2
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

USB supplies +5V, if that is lower than the output of the wall charger it will be slower or not charge at all.
Go to control Panel/Power options/adavnced settings/USB settings. Make sure USB Selective Suspend is Disabled.
My System SpecsSystem Spec
13 Aug 2011   #3
jamiedolan

windows 8 64
 
 

Quote   Quote: Originally Posted by Britton30 View Post
USB supplies +5V, if that is lower than the output of the wall charger it will be slower or not charge at all.
Go to control Panel/Power options/adavnced settings/USB settings. Make sure USB Selective Suspend is Disabled.
The selective Suspend was set to enabled, I've changed it now.

The wall charger is 5V @ .7A. I've had it plugged into the wall charger for about 15-20 minutes and it added 10% to the battery. I previously had it plugged into the laptop for over a half hour and only got 2% added.

Hopefully the selective suspend will help.

Thanks Much!

Jamie
My System SpecsSystem Spec
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13 Aug 2011   #4
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

You're welcome Jaimie. That should let the USB be on whenever the machine is powerd on. Yup the USB has a lower amp rating than the wall charger. My plain non-smart cell takes 2-3 hours to charge via USB.
My System SpecsSystem Spec
13 Aug 2011   #5
mjf

Windows 7x64 Home Premium SP1
 
 

A standard USB port (NOT PASSIVE HUB PORT!!) is normally rated at 500mA (.5A).
I would recommend you invest in an active Hub. Their individual ports will often deliver in excess of 500mA - best check for a particular brand. I like Logitech.

Also treat the Device manager current load readings with a degree of caution especially when using passive hubs.
My System SpecsSystem Spec
13 Aug 2011   #6
jamiedolan

windows 8 64
 
 

Quote   Quote: Originally Posted by mjf View Post
A standard USB port (NOT PASSIVE HUB PORT!!) is normally rated at 500mA (.5A).
I would recommend you invest in an active Hub. Their individual ports will often deliver in excess of 500mA - best check for a particular brand. I like Logitech.

Also treat the Device manager current load readings with a degree of caution especially when using passive hubs.
I just plug it into the computer for charging as it is convenient, I can use a wall charger.

After I changed that setting, it's making a huge difference. It might still be slower than the wall charger, but at the rate it's going I bet it will charge the phone in less than 2 hours now being plugged into the laptop. It's gone up almost 25% in around a half hour or so. That is a lot faster than what it did earlier.
My System SpecsSystem Spec
15 May 2014   #7
Tigerdog

Windows 7 Home Premium 64bit
 
 

Hahaha

500mA is damn 0.5A NOT 5A


500mA=0.5A
My System SpecsSystem Spec
15 May 2014   #8
Tigerdog

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by mjf View Post
A standard USB port (NOT PASSIVE HUB PORT!!) is normally rated at 500mA (.5A).
....

500mA=0.5A !!!!!!!!!
My System SpecsSystem Spec
15 May 2014   #9
mjf

Windows 7x64 Home Premium SP1
 
 

Quote   Quote: Originally Posted by Tigerdog View Post
Quote   Quote: Originally Posted by mjf View Post
A standard USB port (NOT PASSIVE HUB PORT!!) is normally rated at 500mA (.5A).
....

500mA=0.5A !!!!!!!!!

Maybe get your eyes checked. I have written (.5A) NOT (5A). As an Electrical Engineer I sort of understand that.
My System SpecsSystem Spec
07 Apr 2016   #10
besty22

windows 7 ultimate x64
 
 

when satting voltages under 1amp it should be written as 500ma not 0.5 or .5
My System SpecsSystem Spec
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