Need circuit to isolate contrller ckt frm driver ic IR2110 or IR2336

[mobinmk]

Hi frndz

i wana to make an 3 phase inverter.
driver ic ir2110 to drive mosfet.
controller ckt is arduino uno.
spwm pulse generated by dds techninque by aurdino uno.

spwm frequency is 33khz.

which optcoupler is used in my project ?

4n35, pc817 ??
help me to design ckt diag interface optocoupler b/w cntroller ckt and driver ckt

regardz

mobin

 

[treez]

what is the switching frequency of the actual igbts, because if very fast, you will need digital isolator to couple through the gate drive, and a high side supply for it.
..Or one of those HCPL.... type opto couplers.

 

[mobinmk]

what is the switching frequency of the actual igbts, because if very fast, you will need digital isolator to couple through the gate drive, and a high side supply for it.
..Or one of those HCPL.... type opto couplers.

Thnkz bro,

I use FGA25N120 as IGBT

https://www.fairchildsemi.com/datasheets/FG/FGA25N120ANTD.pdf

Switching Frequency is 33khz

driver ic IR2110.

can you recommend which optocoupler ic is better for my application??
pc817??

regardz

mobin

 

[mathespbe]

I guess your switching frequency is very high as far as inverter is concern. Just cross check that your IGBT can be used with this higer frequency. I am suggesting you the optocoupler VO3120 opto isolator which can operate between 15v to 35v with higher switching frequency.

 

[treez]

siLabs do good digital isolators for high side igbt drive too I think.
When I worked at drives place they used the HCPL series optocouplers,


...BUT Look the propogation time is 0.5us, that is too slow for your 30khz switchignfrequency, you must use digital isolator, and the digitial isolator output should drive a high side fet driver ic.

30KHz is a no-no for opto.

 

[mobinmk]

Thnkz frndz

can you provide typical ckt diagram with optcoupler.

design consideration.

this wil help to complete my project in less time