Benson Leung This Google engineer seems to be very focused on USB Type-C. After testing the USB Type-C cable sold on Amazon, this time it said that the latest flagship models HTC 10 and LG G5 are not strictly following the USB Type- The reason for C's standards is that they use Qualcomm Quick Charge 3.0.
According to Benson Leung, the USB Type-C 3.1 standard requires the Vbus pin voltage to be controlled between 4.45-5.25V, but Qualcomm's QC will raise it to 9V or 12V, which violates the standard.
The reply to this Qualcomm is as follows:
Qualcomm Quick Charge is designed to be connector-independent. It can be implemented in a device that supports a variety of connectors, including USB Type-A, USB micro, USB Type-C, and others. When an OEM chooses to implement Quick Charge Into their device, they can configure the voltage to fit within the specifications of the USB Type-C standard. We have received no reports of user experience or device ongoing issues with or without USB Type-C connectors. At Qualcomm Technologies, we are Working to provide the best solutions for our customers and consumers. Qualcomm Quick Charge is a leading edge fast charging solution with more than 70 devices and 200 accessories supporting one of the two most recent versions of Quick Charge, with even more currently in development.
The translated QC is probably not related to the interface used by the device. USB Type-A, USB micro, USB Type-C and other interfaces can be used. All OEM manufacturers can decide whether to use QC and have not received any Accident report about using QC.
The reason why Benson Leung is so entangled may be that vendors use Qualcomm's QC rather than PD fast charge. The full name of the PD is USB Power Delivery. It is a fast charging standard developed by the USB promotion organization. Five levels are set according to the power that can be supplied, and the PD can be used for two-way charging. Simply put, the two devices use the USB cable. Connections can charge each other.
However, this fast charging standard is not tied to USB Type-C. It is not a mandatory standard. At best, it is an optional standard. What's worse is that the PD hasn't been finalized yet. Benson Leung refers to PD 2.0, but PD 3.0 now appears. The actual situation may be even more desperate. Since the PD is not bound to USB Type-C, we see a lot of ridiculous products: For example, one plus two interface is USB Type-C, but it does not support fast charging, only 5V. /2A.
So far, manufacturers using PDs are incompatible with each other. For example, Google uses 5V/3A on Nexus 5X/6P. LeTV has 5V/3A and 9V/2.7A. Apple is equipped with a separate device for New MacBook. A USB Type-C interface, charging is 14.5V/2A, all three are their own standards. By the way, it seems that Microsoft's Lumia 950/950XL is 5V/3A, which is estimated to be compatible with Google? So Benson Leung doesn't ask Apple LeTV for this question?
In addition, Xiaobian is dull and deliberately looking up the USB 3.1 specification file. No description related to Vbus pin voltage is found. As to whether Qualcomm QC has security issues, the USB Type-C interface can withstand up to 100W of power in the PD standard, and QC's current power of less than 30W is simply weak. Of course, as consumers, we want customers to watch the friendly reminder from Google engineer Benson Leung and Qualcomm's reply. Let's make time to test it.
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