Crowbar is a method of shorting a surge current to ground in surge protection devices. This method provides protection against more massive surges than other types, but lowers the clamping voltage below the operational voltage of the electronic equipment causing noise and operational problems. It also permits a follow current which can cause damage.
A circuit that crowbars or rapidly shuts down a converter's output if a preset voltage level is exceeded. The circuit places a low resistance shunt across the output when an overvoltage condition exists.
An overvoltage protection method which shorts the power supply output to ground in order to protect the load when an overvoltage fault is detected.
An overvoltage protection circuit which places an almost short circuit is placed across the points where the overvoltage was detected.
Circuit used to protect the output of a souce from a short circuited load. Load current is limited to a value the source can deliver without damage.
An overvoltage protection circuit which rapidly places a low resistance shunt across the power supply output terminals if a predetermined voltage is exceeded. Crowbar typically used for linear power supplies for they fail with a high output voltage. Modern switch mode power supplies fail with low output voltages making a "crowbar circuit" unnecessary.
A crowbar or crowbar circuit is an electrical circuit used to prevent an overvoltage condition of a power supply unit from damaging the circuits attached to the power supply. It operates by putting a short circuit across the voltage source, much as if one dropped a tool of the same name across the output terminals of the power supply. Crowbar circuits are frequently implemented using a thyristor (also called an SCR) or a trisil or thyratron as the shorting device.