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Anonymous Poster #1

IGBT

12/04/2020 3:00 PM

I am working on a project which has both ac and dc input. The IGBT are acting as power switches. What does the "bipolar" mean in IGBT? Does it refer to non-polarizing? What does back - to -back IGBTs symbol look like for a schematic?

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#1

Re: IGBT

12/04/2020 3:16 PM

Silicon semiconductor materials are doped with other elements. These elements have either 5 electrons in the outer shell (n type) or 3 electrons in the outer shell (p type), whereas silicon has 4 electrons in its outer shell. The n type elements furnish extra electrons to the silicon lattice and the p type create vacancies. Either extra electrons or vacancies contribute to conduction.

Bipolar semiconductor devices utilize both p type and n type semiconductors.

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Power-User

Join Date: Feb 2020
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#2

Re: IGBT

12/04/2020 4:19 PM

"bipolar" refers to the transistor type. There are several. An IGBT is a special type of transistor. It's a bipolar transistor with an insulated gate. Transistors can be simple and easy to work with a few rules, but the study of such can be most trying. The data sheet is your guide. It has testing and application circuits for study. And a lot of parameters are graphed for you.

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Anonymous Poster #1
#3

Re: IGBT

12/04/2020 4:21 PM

Is there any good example showing how the IGBT is used for AC circuit switching. I read this has to be back to back IGBTs. Is there a built in back to back IGBT by manufacturers (part #?). Is the same back to back IGBT could be used to switch a DC circuit?

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#5
In reply to #3

Re: IGBT

12/04/2020 5:15 PM

The IGBT only switches DC. If you want to use it to switch AC, you have to use diodes to steer the current in one direction through the IGBT. Here are two examples of how it is done:

https://electronics.stackexchange.com/questions/121964/bidirectional-ac-switch-with-igbts

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Anonymous Poster #1
#6
In reply to #5

Re: IGBT

12/04/2020 5:55 PM

could this configuration be used for DC as well? or this is only for AC circuit

thanks,

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Guru

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#7
In reply to #6

Re: IGBT

12/04/2020 7:25 PM

could this configuration be used for DC as well? or this is only for AC circuit

Yes, these circuits are "full-wave", so they would work for AC or DC of either polarity.

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Anonymous Poster #1
#12
In reply to #5

Re: IGBT

01/18/2021 11:29 AM

As specified on your reply, In the below IGBT back to back circuit I want to switch AC or DC circuits using the PWM of Arduino Uno, with gate driver. can I jumper the two gates to use one Arduino output and one gate driver to pulse the gates in one shot. or the pulses has to alternate in this circuit.

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Guru

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#8
In reply to #3

Re: IGBT

12/04/2020 7:54 PM

I read this has to be back to back IGBTs. Is there a built in back to back IGBT by manufacturers (part #?).

Mouser has about anything:

https://www.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/IGBT-Modules/_/N-ax1sd?P=1z0xz4p

Look at the datasheet to see how it is internally wired.

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Power-User

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#4

Re: IGBT

12/04/2020 4:45 PM

It depends on exactly what you are trying to do. Try "ac switching using igbt circuits" on google. Anything over 50 volts is dangerous for the in-experienced and un-knowledgeable.
Some applications can use simple rules of thumb.......others require gate tuning or precision timing. Some require a controlling feedback. Thousands of possibilities.
I mostly search out and look up proven circuits, steal them and then modify if necessary. The object of my education was not design, it was trouble shooting and integrating previous design.

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Guru
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#9

Re: IGBT

12/05/2020 11:01 AM

You can buy solid state relays for DC and AC at most electronic or control components distributors.

They come complete with insulation for currents ranging from a 100mA to 30-60A. All you need to drive them is a few volt signal to their LED terminals which is isolated from the power side.

Very convenient.

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Anonymous Poster #1
#10
In reply to #9

Re: IGBT

12/07/2020 1:06 PM

I checked Omron solid state relays, but the ratings are in milliAmps. I need a contact rating at least 10A. do you have any part number

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Guru
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#11
In reply to #10

Re: IGBT

12/07/2020 10:06 PM

Crydom, Crouzet...

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Anonymous Poster #1
#13
In reply to #9

Re: IGBT

01/18/2021 11:51 AM

do you recommend any manufactured? specially if you have specific part number to handle 30A load with the gate drive of 5VDC.

thanks

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Anonymous Poster #1
#14
In reply to #9

Re: IGBT

02/21/2021 10:12 PM

do you have a part#, please post a link

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