Options for dealing with out of range V and I

[Wrydog]

Hello,

I'm working on an H-bridge DCDC-DCAC inverter. When I detect a potentially destructive overvoltage or overcurrent, is the proper response always to shut the device off, i.e. stop switching?

Also, I've heard that the threshold can be 150% of nominal assuming your components are rated to far? I this a good rule of thumb? I assume duration would also play a part in choosing whether shut down is needed or not.

Are there standard practices regarding this?

[Benta]

Generally, don't go outside the Absolute Maximum Ratings.
Youll need to analyze the possible current/voltage combinations that can occur, specially during switching transitions, and make sure they're inside the Safe Operating Area (SOA).

[jeroen79]

What will your device be powering?
What would be the consequences if the the systems shuts down?
If you go for a CC mode instead of a shutdown, how would the load handle the drop in voltage?

What kind of margin you want to design for would depend on what you or your client need.
Do you need to save money by not exceeding the specifications?
Can you afford to spend more on a going above the specs?
What would be the cance and consequences of the device failing when used out of spec?