Freewheeling diode causing error in Full-Bridge Inverter model

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Surojit Sen
Surojit Sen 2017-4-27
Hi, please see the attached Simulink model. Its a simple full-bridge inverter producing quasi-square alternating voltage at the load (resistor). The freewheeling diode, although it is standard in the design, is causing some numerical issue during simulation. The error stated is: "Derivative of state 'full_bridge.Diode.c1.vc' in block 'full_bridge/Diode' at time 0.000255 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)".
I suspect the junction capacitance values of the diode is spiking at simulation initiation. Not sure why. Is there any obvious mistake that I am making?

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