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Half bridge: Totally different results with ideal switch vs MOSFETs

Hello all,

I'm new to PSPICE and I'm trying to simulate a simple half-bridge inverter. When I simulate the topology with ideal switches, the output voltage corresponds to a train of rectangular pulses with a height of Vdc (like it should). But when I simulatethe same topology using MOSFETs (two IRF150 MOSFETs) the output is a train of rectangular pulses of roughly 12% of Vdc. Can it be that the MOSFETs have such a high voltage drop in PSPICE, or am I modelling the circuit wrong??

Here is the netlist from the ideal circuit:

 D_D3         $N_0001 $N_0002 D1N4002
S_S2         $N_0001 0 0 0 Sbreak
RS_S2        0 0 1G
D_D4         0 $N_0001 D1N4002
V_V4         $N_0002 0 100
V_V3         $N_0003 0  
+PULSE 0 15 0.55ms 0.01ms 0.01ms 0.45ms 0.9ms
V_V1         $N_0004 0  
+PULSE 0 15 0.1ms 0.01ms 0.01ms 0.45ms 0.9ms
S_S1         $N_0002 $N_0001 $N_0005 0 Sbreak
RS_S1        $N_0005 0 1G
R_R_Load         0 $N_0001  1k  
R_RG1         $N_0004 $N_0005  10  
R_RG2         $N_0003 0  10  

and here the one with the MOSFETs

 D_D3         $N_0001 $N_0002 D1N4002
D_D4         0 $N_0001 D1N4002
V_V4         $N_0002 0 100
V_V3         $N_0003 0  
+PULSE 0 15 0.55ms 0.01ms 0.01ms 0.45ms 0.9ms
V_V1         $N_0004 0  
+PULSE 0 15 0.1ms 0.01ms 0.01ms 0.45ms 0.9ms
R_R_Load         0 $N_0001  1k  
R_RG1         $N_0004 $N_0005  10  
M_M3         $N_0002 $N_0005 $N_0001 $N_0001 IRF150
R_RG2         $N_0003 $N_0006  10  
M_M4         $N_0001 $N_0006 0 0 IRF150

The only difference between the two are the MOSFETS M_M3 and M_M4 instead of the switches S_S1 and S_S2. This thing is driving me totally nuts, any help would be greatly appreciated.

Cheers!

Javier

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