Optocoupler with IR2110

[pakkiboy]

Dear members , I want to drive my IGBTs through driver ir2110 in sine wave inverter project , But i want to isolate my driver ic IR2110 from microcontroller . I have simulated this crkt for it .. ? is it fine or should i change it ??

https://obrazki.elektroda.pl/6066085300_1382818093.jpg

 

[FvM]

Are you aware of the huge signal delays caused by the optocouplers? Depending on the intended switching frequency, fast logic optocouplers might be required.

 

[Fidelis Anyanti]

Hi, I think your circuit is ok. Remember the proper fire sequence, bootstrap, and the dead time for safe operation of your inverter. However, you may use fast response optos instead.


Cheers.

 

[pakkiboy]

@fvm can u plz suggest me some optocouplerr for it ?? my switching freq id 16kHz
@both , should i cannect output pin 4 to +5 or +12 v ? as output signal of micro controller vary from 0 to 5 v and ir2110 operate at 12 v
Thanks alot

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@fvm what do u think about 6N137?

 

[FvM]

6N137 is one of many suitable high speed logic optocouplers. As it's output voltage is limited to 5V, you have to supply IR2110 with Vdd of 5V, too.

 

[pakkiboy]

Thanks alot sir .
Sir should i connect 6n137 like this ?
pin 1 , 4 --> Not connected
pin 2 --- > (anode ) microcontroller input
pin3 --- > ( cathide ) grounded with 560 ohm resistor

pin 8 --- > 5 V
pin 6 --- > output (with 1 k resistor grounded)
pin 5 --- > Grounded
plz reply
As 6n137 is not present in proteus library otherwise i have to upload the diag

 

[FvM]

6N137 output is open collector and must be connected to a pull-up resistor, as clearly indicated in the datasheet. To achieve non-inverted operation of the optocoupler, you'll connect the LED anode to VCC and cathode to uC output through series resistor.

 

[pakkiboy]

Sir , do u mean this ??? is this fine ?

https://obrazki.elektroda.pl/1788313500_1382889230.jpg

 

[FvM]

According to the datasheet, pull-up resistor values of 1k or below would achieve almost symmetrical switching delays. 10k is surely too high.

 

[pakkiboy]

ok Thanks alot sir .. remaining circuit is fine sir ???