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Brad Albing

Are IGBTs Better Than MOSFETs?

Brad Albing
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Brad Albing
Brad Albing
2/28/2013 5:26:44 PM
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Re: OK
I came across quite a few by Googling; also by using our search engine (at top right of the page).

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Vinca
Vinca
2/28/2013 5:12:49 PM
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OK
IS there any application note about driving an IGBT and taking care for break down?

 

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goafrit2
goafrit2
2/21/2013 6:46:06 PM
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Re: IGBTs have their niche
@dleske, that is an excellent comment. I think you just made everyone better. So it has to do with the premise of the "Are IGBT's Better Than MOSFETs?" and you simply nailed it. That is what it is. I am a MOSFET guy and have never worked with IGBT but I picked some directions from this comment.

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Brad Albing
Brad Albing
2/19/2013 11:08:43 AM
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Re: IGBTs have their niche
That is a good summary of capabilities of the two devices - just the sort of info I was hoping to see. This clarifies my thinking on the uses for IGBTs.

I did some work back in the 1980s on a spot welder/induction heater that used 4 hockey-puck, water cooled SCRs in an H-bridge configuration; the load was set up as a series resonant circuit which facilitated SCR commutation. At the time, we couldn't find sufficiently high-power, cost effective devices in any other technolgy.

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dleske
dleske
2/18/2013 8:30:55 PM
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Re: IGBTs have their niche
Of course, asking "Are IGBT's Better Than MOSFETs?" is a bit like asking "Are Axes better than Shovels?". Both are useful tools, with different purposes!

IGBT's are a 100% specialised device, for high energy power electronics. My earlier comment relates speciifically to the pros and cons of IGBTs in power control compared to high power MOSFETs in power control.

NB: Power electronics <> Digital electronics <> Analog electronics. It is a specialty field with its own distinct features.

MOSFETs are a spectacularly successful technology, scalable both to very large Power devices and to incredibly small Logic devices (used in complementary pairs as CMOS logic), and also usable in linear mode as Analog amplifier devices. They can do just about anything, though for certain specialised purposes other niche devices sometimes perform better.

Other very important device types are Bipolar Junction Transistors (NPN, PNP), signal and power Diode rectifiers, and Zener diodes. Our electronics world would be much more limited without the full set of them.

IGBTs essentially are a hybrid of BJT and MOSFET, combining the high impedance drive and fast turn-on of a MOSFET in parallel with the low-drop high current conduction of a BJT, without the disadvantages of a Darlington Pair.

 

By the way, I started in Power Electronics designing Arc Welders. The first one delivered 600A 60V modulated DC pulses using a giant (2000A) SCR force-commutated by a bank of (20x 50A) MOSFETs. It was a big step forward when we could change to 3x 300A 100V NPN Bipolars (which needed 20A peak base current  to fully saturate ON). It was a gigantic leap again to change to Switch-Mode technology using IGBTs switching at 50kHz.  Don't try that at home with your 50nm 1V CMOS logic gates!

 

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goafrit2
goafrit2
2/18/2013 1:25:30 PM
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Re: IGBTs have their niche
>> When we are talking about handling high speed or low voltage then we need fast switching devices like MOSFETS, FINFETS, Si-nanowire technology.

You are very correct. MOSFET will remain the driver of the semiconductor industry. I do not think any other one will come close. Yet, there are many things CMOS is not great at. High voltage control is better done with IGBT.

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goafrit2
goafrit2
2/18/2013 1:23:49 PM
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Master
Re: Never - MOSFETS Win
Companies use IGBT when it comes to power systems control. I think that will be the case for a very long time.

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goafrit2
goafrit2
2/18/2013 1:23:03 PM
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Re: IGBTs have their niche
>> IGBTs are hard to beat in capability and value for money when you need to control high power.

That is true and not debatable. When it comes to control of high power as you see in most PWM systems, IGBT  is great. But in most other areas of modern electronics manufacturing. CMOS has eclipsed it.

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amrutah
amrutah
2/16/2013 12:33:43 PM
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Re: IGBTs have their niche
dleske, Correct me if I am wrong...

  When it comes to high power handling or applications then IGBT's are more efficient, since the voltage drop is across the junction and not in the channel and the parasitic BJT's or junction formed can be turned off or controlled well...

When we are talking about handling high speed or low voltage then we need fast switching devices like MOSFETS, FINFETS, Si-nanowire technology. These are the technologies of future which will enhance very high level of integration.

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dleske
dleske
2/16/2013 8:10:40 AM
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IGBTs have their niche
IGBTs are hard to beat in capability and value for money when you need to control high power. For 600V or 1200V rating, with >30 amps in a small SMD package, they offer a lot. Smaller die than MOSFET for the same rating.

But when you try to apply them in place of MOSFETs in a high frequency switching converter, you discover they are not the same! Slower turn-off, and often need a co-packed reverse diode. Some resonant configurations also depend on the MOSFET capacitance.

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