superczar
Skilled
It does - but the
With a dumb device, you can plugin a power supply of any wattage but it will draw only as much as needed - with the notable exception of lead acid batteries and maybe a few other exceptions.
With PD, it gets a little more complicated - but is equally if not more safe
When you plug in a PD compliant charger (any wattage), the first few seconds involve a negotiation where the charger tells the device the charging profiles it supports (i.e. Voltage and max current for that voltage) and the device tells the charger what charging profiles it accepts.
The highest available for both is what they will settle on.
If the device is not PD complian and charger does not receive a response, it will drop output to default 5V/2A
I have a bunch of PD chargers ranging from 18W (9v/2A max) 30 W (20V/1.5A max) and 65W (20V / 3,25A max)
I use them interchangeably between the MBA, PD phones/ tablets as well as a couple of PD laptops with no issues. That is exactly what the PD spec is designed for.
Some devices (e.g. a Lenovo) refuse to charge with anything less than 65W profile - although its an artificial constraint (even the Lenovo stops dropping charge even if it does not gain charge)
The only precautions I take:
A) For all devices - I don't use any generic PD charger. All chargers in question are certified PD chargers from Apple/Lenovo/ Ikea. I had a few generic Chinese PD supplies that I retired- Possibly overkill but the PD standard is complex as-is and no point in risking a 9V compliant phone getting hit by a 20V profile
B) Specifically because of the MBA, I retired a generic PD hub (pi-box) for a certified hub (A2119) - Partly because I needed 4k60 support but also because of scattered reports of the M1 (as well as other laptops like G14) getting damaged due to (possible) surges from some no-name PD hubs
Actually it won't be an issue.
With a dumb device, you can plugin a power supply of any wattage but it will draw only as much as needed - with the notable exception of lead acid batteries and maybe a few other exceptions.
With PD, it gets a little more complicated - but is equally if not more safe
When you plug in a PD compliant charger (any wattage), the first few seconds involve a negotiation where the charger tells the device the charging profiles it supports (i.e. Voltage and max current for that voltage) and the device tells the charger what charging profiles it accepts.
The highest available for both is what they will settle on.
If the device is not PD complian and charger does not receive a response, it will drop output to default 5V/2A
I have a bunch of PD chargers ranging from 18W (9v/2A max) 30 W (20V/1.5A max) and 65W (20V / 3,25A max)
I use them interchangeably between the MBA, PD phones/ tablets as well as a couple of PD laptops with no issues. That is exactly what the PD spec is designed for.
Some devices (e.g. a Lenovo) refuse to charge with anything less than 65W profile - although its an artificial constraint (even the Lenovo stops dropping charge even if it does not gain charge)
The only precautions I take:
A) For all devices - I don't use any generic PD charger. All chargers in question are certified PD chargers from Apple/Lenovo/ Ikea. I had a few generic Chinese PD supplies that I retired- Possibly overkill but the PD standard is complex as-is and no point in risking a 9V compliant phone getting hit by a 20V profile
B) Specifically because of the MBA, I retired a generic PD hub (pi-box) for a certified hub (A2119) - Partly because I needed 4k60 support but also because of scattered reports of the M1 (as well as other laptops like G14) getting damaged due to (possible) surges from some no-name PD hubs
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