Safely Charging My Laptop via USB?

[dumbwaiter]

I have a docking station with a USB 3.0 port which supports BC 1.2 charging at 2.4A max.

The laptop manual gives a possible operating voltage and current of: 19.5 V dc @ 2.31 A – 45 W

Is the USB port suitable (and safe) to charge & power the laptop?

Thanks,

Colin

[Huffer]

Some HP laptops will chage with a USB-C port which is a smaller oval port you see on the most recent cell phones. No HP laptop can charge or be powered through a rectangular USB 3.0/3.1 port. If you try to send power in through that port I would think you will fry the motherboard. 

[dumbwaiter]

Sorry, my question wasn't clear.

My docking station USB 3.0 BC 1.2 port would be plugged directly into the laptop power socket.

I read several articles including: www.maximintegrated.com/en/app-notes/index.mvp/id/5801

and I gleaned that it would be safe & practical to do so.

I ask because I don't want to take any unnecessary risk based on any misunderstanding of the material on my part.

Thanks,

Colin

[Huffer]

If it is plugged into the laptop with the right plug and the power output meets the correct voltage and amperage then there is no problem. The laptop does not know where the power comes from just that it is getting current that is within the specifications. Putting current into the laptop that is not the right voltage it might work for a while but will damage the screen or other components so the most important spec on the current is the voltage. 

[dumbwaiter · Accepted solution]

Okay, I am glad I paused because USB 3.0 (except for an increase in available current) doesn't add anything to BC 1.2, thus it is still 5V.

Colin

[Huffer]

Glad to have helped. Generally customary to mark the post that provided the information as the "Solution" to help others find it more easily. 

[dumbwaiter]

Thanks for your reply; however I did not even see your second post.

I am grateful to you for your replies but they did not help me.

My question related specifically to USB 3.0 in conjunction with BC 1.2 and with avalable current increased (above that specified by USB 3.0) to 2.4A

Colin