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What's the proper schematic for driving the IGBT (IRG4BC20UD) from a microcontroller (MSP430-g2553) pin through the optocoupler (FOD3184)? I am going to design a full bridge inverter to drive 9W CFLs (220V/50Hz)? PLEASE HELP!

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    \$\begingroup\$ I have no idea, why don't you start first? \$\endgroup\$ – George Herold Jan 17 '15 at 0:03
  • \$\begingroup\$ The internet is so silent when you ask questions in certain way. Leaving the finger shaking aside, what you seem to want is something like this, albeit not using the exact same chips. \$\endgroup\$ – Fizz Jan 17 '15 at 1:39
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There are many possible schematics. IGBTs are best driven with high voltage high-pulsed-current-drive 15V/-5V drive and of course you want isolation or you wouldn't be asking for an opto. You may be able to get away with +15/0V drive in some circumstances.

Here is one chip that will do the opto part and the driver part, and is similar to the one you are wanting to use. You still have to deal with giving it +15/-5 or at least +15V/0 relative to the emitter on the high side driver.

Probably for such a low power level a bootstrap diode would be an appropriate approach (limited to +V drive only). So, something like a UF4007 connected to a low voltage supply on the mains side. Ask if you don't know what a bootstrap is, or see most any of the IR application notes on half-bridge drivers.

The LED drive circuit most recommended is the shunt circuit (have your micro drive a transistor to shunt the LED, with a series resistor or resistors to the supplies).

enter image description here

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  • \$\begingroup\$ We can't see your actual schematic - if we could I'd we'd be able to at least offer suggestions \$\endgroup\$ – Spehro Pefhany Jan 17 '15 at 4:57
  • \$\begingroup\$ Hello, Thanks a lot for the response. Actually I am trying to develop a full bridge inverter. For the inverter, I need replicate the below circuit for each IGBT. But, my circuit is giving me no output, I believe there is something or everything wrong with the connections. Please help me with your expert opinion. drive.google.com/file/d/0B1sBN0KtrWmMN2RnWVFQWjc5Njg/… \$\endgroup\$ – Tahsina Hossain Jan 17 '15 at 4:59
  • \$\begingroup\$ I hope you can see the schematic now in the above comment? \$\endgroup\$ – Tahsina Hossain Jan 17 '15 at 5:16
  • \$\begingroup\$ Did you have a chance to see my schematic? I am looking forward to your response. Thanks. \$\endgroup\$ – Tahsina Hossain Jan 20 '15 at 0:12
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Have a look at the opto-isolation used in the attached link

http://www.freescale.com/files/microcontrollers/doc/ref_manual/DRM039.pdf

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    \$\begingroup\$ Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. \$\endgroup\$ – Keelan Jan 17 '15 at 17:40
  • \$\begingroup\$ Hi, my test circuit is working properly, thanks a lot. \$\endgroup\$ – Tahsina Hossain Jan 27 '15 at 18:01

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