Fast-overvoltage-protector


Posted on May 23, 2012

This circuit protects expensive portable equipment against all types of improper hookups and environmental hazards that could cause an overvoltage condition. It operates very quickly and does not latchup, that is, it recovers when the overvoltage condition is removed. In contrast, SCR overvoltage circuits can latch and do not recover, unless the power is removed.


Fast-overvoltage-protector
Click here to download the full size of the above Circuit.

Here, Ul senses an overvoltage condition when the drop across Rl exceeds 2.5 V. This causes Ul to apply a positive signal to the gate of Ql, turning it on and shorting the line going to the external circuits. Fuse 1 opens if the transient condition lasts long enough to exceed the i 2t rating.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

PC thermometer schematic
Over-voltage protection circuit
Power supply monitor
Burglar-alarm
Bug-tracer
Extensible Multiple Device Programmer 4 Base
Proximity Detector Circuit Using NE555 PCB
Simple Code Lock Circuit
Low Voltage to 30 kV Out
LS7263 Application Circuit Example



Top