7 ms·

What technical progress. Don't you think that 20V and 240W that are the maximum for Power Delivery are enough to fast charge a smartphone? Even laptops use it!

f1shy 3y ago
Of course! 640kB will be enough for everyone!
- henearkr 3y ago
  Do you realize your parallel doesn't apply here? We're speaking about an iPhone, not a fridge nor a car.
  - f1shy 3y ago
    Power is not the only parameter…
    - henearkr 3y ago
      Fine, just speak your mind. But for charge speed, the only parameters really are voltage and maximum current. Both are plenty enough (for a smartphone battery) in the PD standard.
    - deleted 3y ago
      [deleted]
yardstick 3y ago
It’s not universal until we can power appliances, TVs, Microwaves, Fridges, Ovens, and EV Cars with it.
- henearkr 3y ago
  It's universal enough for all power consumption up to 240W, which includes what you need to charge a smartphone. For huge appliances, you need a different connector, larger conductors in the cables, etc... it really will never scale the whole spectrum because of physics laws. Else, everything melts and burns.
- worewood 3y ago
  Here, you dropped this: /s
- kstenerud 3y ago
  For which we have IEC connectors. 110/220v AC power connectors are not the problem.
makomk 3y ago
It's not just a question of total power - smartphones have limited space and thermal budget for internal power conversion compared to laptops, which means that the fastest charging option often moves some of the work of converting to the correct voltage to the charger. (Also, I don't think 240W USB PD has really been adopted by anyone currently, and that's a spicy amount of current given the general quality of USB C cables.)
- hackernewds 3y ago
  what advantage does the lightning cable afford? doesn't seem that Apple has really put their foot on innovation
- megous 3y ago
  Battery in the phone needs ~4.2V for charging. So you need conversion in the phone no matter what voltage you supply on the USB port.
  - crote 3y ago
    It depends. USB-C supports PPS, which allows the charged device to request a specific voltage, so conversion is no longer needed. The specification does mandate that the device must be able to fall back to a static voltage if the charger does not support PPS, though. But in practice a device could totally require PPS for fast charging, and only do trickle charging with a non-PPS charger.
    - megous 3y ago
      > But in practice a device could totally require PPS for fast charging, and only do trickle charging with a non-PPS charger. Not sure we have the same terms. Trickle charging is 0.02-0.05C charging to see if the charger can get the battery safely from being overdischarged to say 3V where it can start normal CC charging phase. That would probably piss off a lot of users and the EU if not even normal charging was supported by a device connected to any USB charger, because that's back to requiring a specific charger for each device, where not even basic things that all users expect work anymore with all conforming chargers.

f1shy 3y ago

Of course! 640kB will be enough for everyone!

henearkr 3y ago
Do you realize your parallel doesn't apply here? We're speaking about an iPhone, not a fridge nor a car.
- f1shy 3y ago
  Power is not the only parameter…
  - henearkr 3y ago
    Fine, just speak your mind. But for charge speed, the only parameters really are voltage and maximum current. Both are plenty enough (for a smartphone battery) in the PD standard.
  - deleted 3y ago
    [deleted]

yardstick 3y ago

It’s not universal until we can power appliances, TVs, Microwaves, Fridges, Ovens, and EV Cars with it.

henearkr 3y ago
It's universal enough for all power consumption up to 240W, which includes what you need to charge a smartphone. For huge appliances, you need a different connector, larger conductors in the cables, etc... it really will never scale the whole spectrum because of physics laws. Else, everything melts and burns.
worewood 3y ago
Here, you dropped this: /s
kstenerud 3y ago
For which we have IEC connectors. 110/220v AC power connectors are not the problem.

makomk 3y ago

It's not just a question of total power - smartphones have limited space and thermal budget for internal power conversion compared to laptops, which means that the fastest charging option often moves some of the work of converting to the correct voltage to the charger. (Also, I don't think 240W USB PD has really been adopted by anyone currently, and that's a spicy amount of current given the general quality of USB C cables.)

hackernewds 3y ago
what advantage does the lightning cable afford? doesn't seem that Apple has really put their foot on innovation
megous 3y ago
Battery in the phone needs ~4.2V for charging. So you need conversion in the phone no matter what voltage you supply on the USB port.
- crote 3y ago
  It depends. USB-C supports PPS, which allows the charged device to request a specific voltage, so conversion is no longer needed. The specification does mandate that the device must be able to fall back to a static voltage if the charger does not support PPS, though. But in practice a device could totally require PPS for fast charging, and only do trickle charging with a non-PPS charger.
  - megous 3y ago
    > But in practice a device could totally require PPS for fast charging, and only do trickle charging with a non-PPS charger. Not sure we have the same terms. Trickle charging is 0.02-0.05C charging to see if the charger can get the battery safely from being overdischarged to say 3V where it can start normal CC charging phase. That would probably piss off a lot of users and the EU if not even normal charging was supported by a device connected to any USB charger, because that's back to requiring a specific charger for each device, where not even basic things that all users expect work anymore with all conforming chargers.