4 ms·

Also, with the new USB standard, its no longer only 5v, you can now use up to 20v @5A [1]. My laptop that has a USB-C port to charge uses the full 20v. 120/240

Also, with the new USB standard, its no longer only 5v, you can now use up to 20v @5A [1]. My laptop that has a USB-C port to charge uses the full 20v. 120/240VAC 50/60hz @ ~12A (steady state draw) is pretty much the only thing people agree on when it comes to consumer power. [1]: http://www.usb.org/developers/docs/ http://www.usb.org/developers/docs/

voltagex_ 10y ago
I'm waiting for the first news stories about house fires caused by USB-C chargers. A faulty 5Vx1A charger will melt, 20Vx5A will be a bit more lively. The tests by people like Benson Leung [1] haven't given me any faith that manufacturers will actually care about getting the specs right. [1]: https://plus.google.com/collection/s0Inv https://plus.google.com/collection/s0Inv
- walrus01 10y ago
  wait until we have USB-C charged hoverboards (and similar products), where not only can the charger and cable catch fire, but so will the low budget Li-Ion battery pack/charge controller/battery management system.
- extrapickles 10y ago
  Also, the specs themselves are non-ideal. What they really need instead of the cable DRM/smarts (USB Authentication [1]) is to standardize V-Droop (Voltage drop from no-load) detection and behavior. They need to make part of the spec a current ramp and monitoring of the voltage while doing so. If the voltage sags too much or ripple increases that means the cable or power source can't handle the load and the device needs to back off. There is very little a non-compliant power supply or cable can do to fake conformance without costing more than doing a conformant implementation. Some phones monitor V-Droop already as there are too many bad power-supplies and undersized cables out there. The downside is that it isn't as sexy to implement this. [1]: USB Authentication section of http://www.usb.org/developers/docs/ http://www.usb.org/developers/docs/
  - digi_owl 10y ago
    Oddly i think the original charging spec do it that way when dealing with dumb chargers.

voltagex_ 10y ago

I'm waiting for the first news stories about house fires caused by USB-C chargers. A faulty 5Vx1A charger will melt, 20Vx5A will be a bit more lively. The tests by people like Benson Leung [1] haven't given me any faith that manufacturers will actually care about getting the specs right. [1]: https://plus.google.com/collection/s0Inv https://plus.google.com/collection/s0Inv

walrus01 10y ago
wait until we have USB-C charged hoverboards (and similar products), where not only can the charger and cable catch fire, but so will the low budget Li-Ion battery pack/charge controller/battery management system.
extrapickles 10y ago
Also, the specs themselves are non-ideal. What they really need instead of the cable DRM/smarts (USB Authentication [1]) is to standardize V-Droop (Voltage drop from no-load) detection and behavior. They need to make part of the spec a current ramp and monitoring of the voltage while doing so. If the voltage sags too much or ripple increases that means the cable or power source can't handle the load and the device needs to back off. There is very little a non-compliant power supply or cable can do to fake conformance without costing more than doing a conformant implementation. Some phones monitor V-Droop already as there are too many bad power-supplies and undersized cables out there. The downside is that it isn't as sexy to implement this. [1]: USB Authentication section of http://www.usb.org/developers/docs/ http://www.usb.org/developers/docs/
- digi_owl 10y ago
  Oddly i think the original charging spec do it that way when dealing with dumb chargers.