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"and allow charging without authentication - who cares where I get 65 W of power from" That 65W of power on USB-C is coming in at 20V most likely. Many devices
by lightedman 8y ago
"and allow charging without authentication - who cares where I get 65 W of power from"
That 65W of power on USB-C is coming in at 20V most likely. Many devices simply will not tolerate that high of a voltage. This is why authentication and negotiation are absolutely essential.
- geofft 8y agoNegotiation, yes. But why authentication? Why do I care from whom the 20 V come as long as it is actually 20 V? You can fry a regular AC-powered device by giving it 240 V power instead of 120 V, or 50 Hz instead of 60 Hz, or whatever. But we don't need authentication of power outlets. What makes USB different?
- lightedman 8y agoAuthentication also means verifying that the charger is what it says it is and is capable of doing what it claims to do. Without authentication, your phone would not know the difference between QuickCharge and TurboPower specs, and might not charge properly (or pick the wrong charging spec and get fried.)