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[SOLVED] Module to determine voltage requirements?

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zacsophonist

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Hello,

Is there such a circuit/module that can automatically determine the voltage requirements of a connected device?
Example, it will have a 12V or 24V battery input, and there are 4 devices connected to it that require either 3.3V, 5V, or 12V.

Thank you
 

Solution
Automatic voltage detection works for battery chargers but can't work for most of the mentioned devices. Typically they will be destroyed without previous warning signs when exceeding a certain input voltage.

USB charging is an exception, all devices are suited for 5V, higher voltage can be agreed through protocol, refer to USB spec.
Hi,

"a device" is a rather vague description.
It could be a resistor, transitor, IC, cellular phone, LED, or millions others
It could be supplied with AC or DC
it could have a norm connector, a wireless power transfer, a battery, a transformer, a pv cell...

So the only answer can be: No, impossible.

Klaus
 

Hi Klaus, thanks for your response.
Sure, I can provide more information.
The battery I referred to would be either 12v or 24v DC.
By "devices" I mean consumer electronics (like a wireless router & raspberry pi) that are powered with a USB-C connection, as well as an ESP32 dev board that takes micro USB.
I'm currently using separate and specific buck converters between the battery and each electronic device, but I'm curious if there exists any module/etc. that can determine the voltage requirements of, and provide correct voltage to, each of these electronic devices on its own.
 

Automatic voltage detection works for battery chargers but can't work for most of the mentioned devices. Typically they will be destroyed without previous warning signs when exceeding a certain input voltage.

USB charging is an exception, all devices are suited for 5V, higher voltage can be agreed through protocol, refer to USB spec.
 
Solution
Automatic voltage detection works for battery chargers but can't work for most of the mentioned devices. Typically they will be destroyed without previous warning signs when exceeding a certain input voltage.

USB charging is an exception, all devices are suited for 5V, higher voltage can be agreed through protocol, refer to USB spec.
Thank you FvM, this is exactly what I needed to know. Will look into USB protocol
 

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