Questions tagged [usb-pd]

For questions related to the USB Power Delivery specification, which allows power greater than the USB standards, when using compliant ports and special cables, for purposes such as charging attached devices. Do not use on questions related to power available in a standard USB connection.

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Charge laptop with USB PD at 20V even if it draws less than 45W?

I want the possibility to charge my Laptop (19V/3.42A, Acer Aspire 5 A515-52G) from a power bank. Since my laptop only has the ordinary barrel power connector but power banks usually come with a USB-C ...
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21 views

Reversing the direction of USB PD charging on Windows 10

If I connect my USB PD power bank to my Android phone (which also supports USB PD) I am given the option to charge the power bank from my phone or vice versa. This is, of course, one of the standout ...
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1answer
57 views

How to detect what wattage that my Windows laptop is receiving via USB-PD?

I don't know too much about USB-PD. I understood that USB-PD requires negotiation between the charger and the receiver. So probably my Windows laptop (Dell XPS 9570) should be able to know the current ...
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2answers
142 views

Is it safe to insert USB-C charger into a laptop that does not support charging via USB-C?

Say, there's a laptop with USB-C port, its specs don't mention support for USB Power Delivery, but some pages on the Internet say that a laptop may support USB charging even when it isn't specified. ...
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0answers
41 views

Can a higher power-rated USB-C PD power adapter be used to charge a PD device if power specs at least meet or exceed the device requirements?

Quite simply, can I use my new 65w Dell USB-C PD power adapter, that I use for my bigger laptop, to charge my smaller USB-C PD devices such as a tablet. The tablet supposedly charges at a PD rate of ...
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4answers
3k views

Is it safe to try charging my laptop with a USB-C PD charger that has less wattage than recommended?

I have a Thinkpad x270 and read that I can charge it using USB C Power Delivery and that it draws 45W. I also have a 36W USB C charger. What would happen if I combined those two?
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0answers
31 views

Is there a way to use USB 3.1 charger to charge 2.0-based devices?

I have a USB 3.1 charger supporting power delivery and quick charge technologies. Since it has a 3.1 socket, are there any adapters that would let me use that socket to plug in a regular micro-usb ...
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1answer
168 views

Do many desktop and laptop computers provide 10W or more over USB?

As far as I understand, USB defines two additional power-related standards - Battery Charging and Power Delivery. Both of these allow for current above the standard 500mA with 5V, and PD offers higher ...
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1answer
3k views

Why is charging mobile devices via USB so slow?

I'm developing apps so I have often a mobile device connected sometimes the battery just drains out and I'm wondering why this is happening. I was thinking about why is there no USB hub with Quick ...