Use SCR help give fuse torn fast
If fuse slow get into trouble not good may make the circuit can is damaged. Normally fuse torn when current change too much. But more will torn must use the period of time which may late go to all right with regard to add SCR go to make fuse torn fast go up by when voltage exceed more at ZD fix. Make SCR work have current flow through very quickly. Make power supply and load safety. An example is if friends use load 5V as a result should use Zener Diode 5.6V sizes etc.
Categories: Detector Tags: circuit SCR, Voltage Protect
Over Voltage Protection
Safety devices like fuses provide protection against excess current, but do nothing for transients and short duration spikes of high voltahe on the power supply lines.This circuit uses the “crowbar” method and provides fast protection against transient voltage spikes, transients that could cause damage to sensitive components. The thyristor will trigger in a few microseconds. This is over 1000 times faster than an ordinary quick blow fuse. If the output voltage exceeds the limit set by the zener, then it will conduct. The voltage across the 4.7k resistor will rise, the thyristor switches on and the power rails are short circuited.
Read more Source: http://www.zen22142.zen.co.uk/Design/overvoltage.htm
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Categories: Detector, Electronic Control, Power supply, Security Tags: security circuits, Voltage Protect
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