MOSFET Fault in Buck Converter

This model shows how a fault may be applied to a MOSFET in a power converter in order to explore the operation of protection circuitry. After the MOSFET becomes faulted, the crowbar circuitry is activated in order to clamp the output voltage across the load and eventually to cause the fuse to blow.

Model

Faulted Switch Subsystem

Crowbar Subsystem

Simulation Results from Simscape Logging

The plot below shows the current passing through the input Fuse and the voltage across the Load resistor.