I have designed a Buck converter, in this I am using IGBT MODULE CM150DU-12H as a switch.
This IGBT having anti parallel diode so shall i use another same type of IGBT as diode in buck converter.
First IGBT am using as a switch, another same type of IGBT module shall i use as diode without giving the pulses to gate.
First IGBT module as switch terminals C2E1, E2, gate terminals G2,E2
Second IGBT as diode terminals - C2E1, C1.
No problem, vious can use the IGBT CM150DU-12H module, but it is necessary to use the transistor C1 switch
This will work. I've used similar configurations before.
One can use the same device for both the switch and the freewheeling diode. Just ground the gate of the second IGBT and you can use that one's body diode for freewheeling.
Seeing you have two switches, you can also consider using a synchronous buck arrangement, but you may not gain anything as the losses over the IGBT is higher that that of a freewheeling diode.
Technically, the answers given are correct and in case you do research, the approach is ok.
In case you want to use the design as a commercial approach or a platform for design, there are chopper modules to do the trick, not having the 2nd IGBT inside. Though the difference in pricing might seem small, your approach is too expensive at first glance.
If you go for this approach in higher power levels, generally there is a risk of so-called parasitic turn-on if you do not apply a negative gate-voltage to the IGBT not used. This may lead to false behavior of your design.
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