nvd
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I have to power two touch screens using an embedded PC. The PC can provide 1.5 A maximum through USB ports.
Each screens takes 1 A of current from USB. Thus, there are two USB connectors (in parallel) with each screen.
Overall demand from two screens is 2 A that cannot be handled by the internal power supply of the PC.
The plan is to connect the other USB connector of each screen to an external hub powered up by another power supply.
By doing so, +5 V of the PC will get connected to +5 V of the external hub.
What I am concerned about is the protection in the USB ports of the PC. Can external power be connected to the +5 V output of a USB port directly?
Each screens takes 1 A of current from USB. Thus, there are two USB connectors (in parallel) with each screen.
Overall demand from two screens is 2 A that cannot be handled by the internal power supply of the PC.
The plan is to connect the other USB connector of each screen to an external hub powered up by another power supply.
By doing so, +5 V of the PC will get connected to +5 V of the external hub.
What I am concerned about is the protection in the USB ports of the PC. Can external power be connected to the +5 V output of a USB port directly?