[SOLVED] how to isolate microcontroller from IPM ?

[anotherbrick]

I build a servo motor driver using STM32

however I didnot isolate GND of micro from power stage GND
which was a wrong decision
becouse micro is miscounting encoder pulses becouse of noise in the GND

now I want redesign the boards and seperate the two GNDs

my question is which optocouplers shall I use to isolate micro from IPM ?
( my PWM frequency is 10 Khz )

 

[ismbn]

MCT2E will work in this inshallah..
in 1 of my application i am using it for more then 150KHz...
in the data sheet it is mention that it rise time and fall time is 5us typically
so that it goes up to 200KHz... Go for it.....



Mohammed Ismail

 

[Soumyajit]

I build a servo motor driver using STM32

however I didnot isolate GND of micro from power stage GND
which was a wrong decision
becouse micro is miscounting encoder pulses becouse of noise in the GND

now I want redesign the boards and seperate the two GNDs

my question is which optocouplers shall I use to isolate micro from IPM ?
( my PWM frequency is 10 Khz )

Use 6N137 or 6N138 or 6N139. They are high speed opto couplers. Try going through their datasheet by searching on Google...
If you need any further clarification, feel free to ask me...