A Typical Crowbar Circuit Diagram A crowbar circuit is a power supply protection circuit that rapidly short-circuits ("crowbars") the supply line if the voltage and/or current exceeds defined limits. It is used to prevent an overvoltage condition of a power supply unit from damaging the circuits attached to the power supply. In practice, the resulting short blows a fuse or triggers other protection, effectively shutting down the supply.

Crowbar circuits are frequently implemented using a thyristor (also called an SCR) or a trisil or thyratron as the shorting device. The following schematic shows a A Typical Crowbar Circuit Diagram. This crowbar circuit has an 8V power supply, and triggers at 9.1V. To change the power supply rating, the zener diode, ZD1, needs to be changed to reflect the new trigger voltage. It should be about 1V higher than the nominal supply voltage.



Related Post

1991 Toyota Auto Wiring Diagram
2002 Aprila RSV Mille Electrical Wiring Diagram
Toshiba LCD TV/DVD 14DLV75 Printed Circuit Board Diagram Electrical Schematic and Wiring
Simple Voltage Regulator Circuit Design using Zener Diode
Kawasaki EN500 Vulcan Junction Box Circuit Diagram