The application for high voltage igbt(1200 ~ 1700 V)

IGBTs are available with voltage ratings from 600V to 6.6kV (6600V). The

IGBTs are commonly used at power levels from 1kW to 1MW. I have used small 1400V IGBTs in a 50W flyback converter running from 1000Vdc, as well as in a 1MW 3-phase inverter running from 480Vac.

The biggest IGBT I have seen is a device that will switch 1200A at

The IGBT is just a switch. what you do with it depends on the application, but invariably is an AC-to-DC (or DC-to-AC) converter.

A welder for example has an AC-DC converter which connects to mains electricity (this may be IGBTs, but is usually a diode bridge). This generates a high voltage DC bus (~ +300V for 230Vac, +600V for 400Vac), to which is attached a DC-AC converter (using IGBTs). This generates high-frequency AC (anywhere from perhaps 10kHz to say 500kHz), which is fed into a nice small high-frequency transformer. The AC output of the transformer suually goes through another AC-DC converter (either a diode bridge or one made with FET synchronous rectifiers, IGBTs are not much use at low voltage) and then thru a large inductor to the welding piece.

HTH

Cheers Terry

Terry, First of all, I can't thank you enough. But unfortunately, I don't get it. Actually, I want kind of answer like X-Ray or Welding device something like that. And most of all I want something related in 1200v or 1700v igbt or same voltage Fet. I heard some Inducting Heat maker need this kind of IGBT. Am I right?

I just want very specific answer, not kind of inverter something. I need the different manufacturers or specific industry which need this kind of IGBT or FET or even Diode.

Derek

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If it's marketing information you're looking for, this newsgroup is probably not the best place to look. One good source of free information on applications is promotional literature from manufacturers, although they may omit entire market segments for various reasons. There are also industry surveys in the trade literature, and they often give away a certain amount of free info in order to get you to read the magazine and purchase the expensive full reports.

There are also a lot of cross-connections in the power semi industry- joint ventures and so on. For example, if you were trying to sell power semis in the welding field, you might look to the US company Thermal Dynamics, who offers one of the more popular AC/DC inverter welders (as well as plasma cutters). But you'd quickly find that it's a brand-named unit from a Japanese company, and a company that itself manufacturers the semis at that, so there is little chance to sell (say) Korean semis to them.

Best regards, Spehro Pefhany

Spehro, Your mention is just great. Yeah, I want to try to know the marketing information. But I don't want to try to sell korean semi to USA company such as Thermal Dynamics. In contrast, I want to try to sell USA semi such as IXYS to Korean company like welders. I've tried a lot of promotional literature from manufacturers, but I couldn't find very specific end-user. Maybe, the magazine has an answer for me. Spehro! Please, recommend this kind of magazine. I'm gonna buy some. I must study this field. Help!

Best regards, Derek Byun

I'd like to see a 1700V FET...

1700V IGBTs for 690Vac operation

motor controllers, welders, UPS, power conditioners, harmonic compensators, active filters, DC power supplies - the list goes on....

I've built induction heaters using little SO-8 MOSFETs. Admittedly they were very small induction heaters :)

I have read of IGBTs used in large (MW) induction heaters. A place I used to work for made a 400kW induction heater out of a (1200V) IGBT motor controller, simply by connecting a suitable coil (around a large crucible). Ultimately an induction heater is simply an inverter.

there isnt really a specific answer. IGBTs are useful over a power range from about 1kW to 10MW. Pretty much any job within that power range can be done by IGBTs. FETs stop at about 10kW or so.

GTO's tend to be used from about 1MW up to 1000MW. IGBTs have pretty much taken over GTOs at lower power levels.

why?

based (as above) on AC voltage rating.