Ac Crowbar Circuit. Once the fuse is blown the power supply will be disconnected from the load and thus preventing it from high voltage. A crowbar circuit is different from other safety or latching circuits for example a clamp in pulling.
It protects the load by shorting the output terminals of the power supply when a overvoltage is detected. Typically a 5 volt rail may run with a 6 2 volt zener diode. The two commonly used components for the crowbar device are silicon controlled rectifier scr and the mosfet.
A crowbar circuit monitors the input voltage and when it exceeds the limit it creates a short circuit across the power lines and blows up the fuse.
A crowbar circuit is usually placed across the power supply s output terminals to protect the load against any overvoltage. A crowbar circuit monitors the input voltage and when it exceeds the limit it creates a short circuit across the power lines and blows up the fuse. Typically a 5 volt rail may run with a 6 2 volt zener diode. And this low on state voltage will further reduce any electrical over stress to the protected circuit.
