Dear fellow engineers,
I am trying to find a robust & proven design for detecting mains voltage precens for our MCU-board. We need to detect if AC (110V or 230V) is present and present a logic signal accordingly to the MCU. Although there are many suggestions to simply use an opto-coupler and series resistors on the AC-side I am not sure this is robust enough. I am thinking about voltage spikes that can occur on the AC -side and the effects it can have on the LED in the Opto-coupler. Do you have any ideas that is tested and "fool proof"?
All the best
Swedman
I am trying to find a robust & proven design for detecting mains voltage precens for our MCU-board. We need to detect if AC (110V or 230V) is present and present a logic signal accordingly to the MCU. Although there are many suggestions to simply use an opto-coupler and series resistors on the AC-side I am not sure this is robust enough. I am thinking about voltage spikes that can occur on the AC -side and the effects it can have on the LED in the Opto-coupler. Do you have any ideas that is tested and "fool proof"?
All the best
Swedman