Bill,
Great questions.
My particular monitor is 15.6", and also has built-in speakers, an amazing feat given it's incredibly thin -- the screen part is certainly less than 1/4" (
https://www.amazon.com/gp/product/B08FWN57DG). It is powered exclusively by a USB-C connection, which appears to have a maximum output of 15 watts at 5VDC (
https://www.asme.org/topics-resource...power-delivery).
Yes, there are indeed hard-wired 12-volt powered USB-C ports. There are lots, in fact -- this one is an example:
https://www.amazon.com/Charger-Ouffu.../dp/B092M6S98V
Pretty easy to mount, it appears, and then would simply connect to the TM 12V wiring.
You'll note that the USB-C port on that particular one has a "PD" marking -- that means "Power Delivery", and according to the above ASME website, it can supply up to 100 watts, with a variable voltage up to 20 VDC. (However, that particular one says it only goes up to 20 watts, so apparently there are exceptions to the PD standard; this one supplies up to 65 watts:
https://www.amazon.com/dp/B0B3WVFKN1)
The voltage setting is determined by communication with the connected device. According to the ASME website:
Quote:
|
USB Power Delivery establishes operating protocols to ensure that the higher voltage available in the recent USB releases does not damage legacy equipment which was designed for 5 V operation. The USB Power Delivery requires conforming equipment to initially deliver 5 V at a maximum of 900 mA to the load to prevent such damage. Communication between the load and the power source can then establish a higher maximum load current and greater operating voltage. If no communication ensues after connecting the load and the power supply, then the power supply configuration remains at 5 V and 900 mA maximum load current capacity. If communication between the load and the power supply is lost after it has been established, then the power supply will safely revert back to the 5 V and 900 mA configuration.
|
USB-C is a pretty amazing protocol. I'm not sure why they even call it USB, because it is far more capable than legacy USB ports. Not only do they have faster data transfer, but they're just more versatile. I have a seemingly hardware-driven USB-C docking station for laptop that connects ethernet, 2 monitors, keyboard, mouse, scanner, DVD drive, and external speakers -- and they are connected to the laptop with a single USB-C connection. It's incredible. A far cry from the $200+ proprietary docking stations that had special connectors with a zillion pins.
So....times have changed.
Dave