Which is better: IGBT or MOSFET?
Tags: inverter, Grid inverter
Both IGBT and MOSFET are the best as per application.
I am designing high efficiency grid inverter for PV with dual buck topology for 300 watt system. During my simulation I saw that the body diode of two Mosfet switches getting turning on and this switches running on grid frequency (50 Hz). And other two Mosfet's body diode of the inverter are silent during operations. And that is running at PWM frequency. One option I feel that I could replace igbt that will switch on grid frequency or else in the mosfet switch I could put an inductor to avoid the diode getting turning on. but if choose igbt i will get high on state losses compare to mosfet due to small current I= 1.30 rms and mosfet fits for that.
I am designing high efficiency grid inverter for PV with dual buck topology for 300 watt system. During my simulation I saw that the body diode of two Mosfet switches getting turning on and this switches running on grid frequency (50 Hz). And other two Mosfet's body diode of the inverter are silent during operations. And that is running at PWM frequency. One option I feel that I could replace igbt that will switch on grid frequency or else in the mosfet switch I could put an inductor to avoid the diode getting turning on. but if choose igbt i will get high on state losses compare to mosfet due to small current I= 1.30 rms and mosfet fits for that.
<- - I have an Opinion - ->
As a possible solution, you can either choose a MOSFETs with fast body diodes (some links were already given here earlier) or if this solution still seems inferior - to use additional/separate sufficiently fast diodes for HF current freewheeling, separated from LF MOSFETs by inductors.
(low-voltage Schottky diodes also could be used for such separation)
Involving IGBTs into this circuit is rather irrelevant, as what you actually need is not IGBTs themselves, but sufficiently fast diodes capable to work in buck converter in CCM mode.
In general, I'd also advice you & others to rely more on your own head(s) than on computer-aided simulations (especially in simple cases like this one), as the former may be capable of proposing solutions without relying on external help, while the latter - hardly. - -> by: Inverters.cn