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.
Questions tagged [usb-pd]
17 questions
13
votes
2 answers
What can a program find out about a USB-C cable attached to the computer?
I plug an unknown USB-C cable into my computer.
Theoretically, could a program read information about that cable? In particular:
What version of USB it supports: 2.0, 3.1, etc.
Whether it supports Thunderbolt, etc.
Whether it supports Power…
Nicolas Raoul
- 11,561
8
votes
1 answer
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 wattage input it's receiving. Windows probably…
sasawatc
- 181
- 1
- 2
8
votes
4 answers
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?
d33tah
- 1,464
6
votes
4 answers
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. Would it be safe to try it out by inserting USB-C…
user
- 1,290
3
votes
1 answer
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 Charge. I guess this is caused by a different "USB…
rekire
- 494
2
votes
1 answer
Why do PD charging ports sometimes only support 65 watts and above devices (but not devices with less than 65 watts)?
E.g., this laptop's specifications state (mirror) (MSI GS76 laptop):
PD charging port only supports 65W watts and above devices (e.g. adapter, powerbank).
Why do PD charging ports sometimes only support 65 watts and above devices (but not devices…
Franck Dernoncourt
- 24,246
- 64
- 231
- 400
2
votes
1 answer
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 features of USB PD, and from what I understand a…
DividedByZero
- 400
1
vote
1 answer
Can a USB C PD connection kill USB A port?
I wanted to debug an Android-based device (not a cell phone), and connected its USB C port to my computer's USB A port using a cable with USB C connector on one end and a USB A connector on another end.
The computer (an iMac) turned off immediately…
Serge Vin
- 11
1
vote
3 answers
Thunderbolt 3: Can I get "Power Delivery" *output* on a TB3 hub/chip?
tl;dr: read title. Thunderbolt 3 hubs often have a "power delivery" port (alt: usb-c port that may support usb-pd). Are they input only, or also output, or 'maybe, good luck getting the specs'? Is there some way to get 70 watts power output from a…
Kyle Baker
- 277
1
vote
2 answers
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 PD 45W (20V/2.25A) port, I'm planning to use a…
morrow
- 145
0
votes
1 answer
How can I view the max wattage of my usbcpd port of my laptop?
I have a Lenovo laptop with one of the USB C 3.2 gen 2 ports labeled as USB-PD, and I'm wondering what it is rated for. Based on some Googling it seems that USB 3.1 PD ports support up to 240 watts, but I'm not sure what that port is. There are no…
0
votes
2 answers
Understanding bidirectional power of Laptops with USB-C charging
So I've deeply read into the USB-PD system. I've looked at many pinouts of the Type-C port.
I've realized: when you can charge the device through this port - how can it power regular USB devices?
I am trying to create a mobile "embedded" device…
Markus Noack
- 1
- 1
- 3
0
votes
1 answer
Can I see how much power my laptop is drawing from a USB-C PD source?
I've got a few USB-C chargers that can deliver power via USB-PD; a 65W charger, a 100W charger, and a hub that advertises "PD Passthrough".
My laptop accepts up to 100W, which is why I'm surprised when I plugged the 100W charger into the hub and try…
matthewsteele
- 103
0
votes
1 answer
If I have two Windows machines with USB-C power, can I use one as a power source for the other?
I have two laptops; each has a USB-C port that accepts a 65W power supply, both running Windows 10.
Say I have laptop A fully-charged, and laptop B is nearly dead. I'd like to plug laptop A into B with a USB-C -> USB-C cable, and have A charge into…
matthewsteele
- 103
0
votes
0 answers
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 12V@2.5amps. Will a bigger PD adapter that…
