[LINK] The 'Sea Snake' Phenomenon: 'Please Explain'

[Bernard Robertson-Dunn]

On 24/09/2021 10:07 am, Roger Clarke wrote:
> EU wants USB-C charging port to become standard for all devices
> https://www.itnews.com.au/news/eu-wants-usb-c-charging-port-to-become-standard-for-all-devices-570274

There is more to USB than just wire and connectors these days.

Have a look at this site:

What is PPS Fast Charging, and What’s the Difference Between PD, QC, and
PPS?

https://blog.ravpower.com/2021/02/pps-fast-charging/

Mobile devices are becoming more powerful by the day and their power
consumption has increased drastically, making fast charging
indispensable. In 2017, the USB Implementers Forum (USB-IF), the
organization that supports the advancement of USB technology, added PPS
fast charging to the USB PD 3.0 standard, creating a unified solution
for today’s fast charging devices. That same year, Qualcomm’s QC 4.0 met
the PPS standards, attaining a unified charging scheme.

So, what is Programmable Power Supply (PPS)?

PPS fast charging is the most advanced charging technology for USB-C
devices. The technology adjusts the voltage and current in real-time,
depending on a device’s charging status, feeding it with maximum power

... etc

If you want to get down and dirty, this is a pdf on the design of USB
Power Delivery:

https://usb.org/sites/default/files/D2T2-1%20-%20USB%20Power%20Delivery.pdf

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Regards
brd

Bernard Robertson-Dunn
Canberra Australia
email: brd at iimetro.com.au