I am designing a high-side solid-state relay to replace a mechanical solenoid. The solid-state relay uses an array of high-power MOSFETs connected in parallel. It has been tested and successfully switches a 100A DC load at 12V.
I am concerned about the possibility of the switch failing closed. The load is a high-speed DC motor intended for intermittent duty and leaving it on could damage the motor and create a safety issue. Apart from large flyback diodes near the source, what other precautions can be taken to avoid damage to the MOSFETs that could lead to a failed-closed condition?
The load is a high-speed DC motor intended for intermittent duty and leaving it on could damage the motor and create a safety issue.
- that's become a showstopper in my book. Do you normally do risk assessments this way? \$\endgroup\$