The protection circuit composed of the pressure sensitive resistor

Published:2011/6/13 20:12:00 Author:Christina | Keyword: protection circuit, pressure sensitive resistor | From:SeekIC

The pressure sensitive resistor is always connected with the input port of the protected electrical in the circuit, as the figure shows. From the figure we can see the voltage divider is composed of the pressure sensitive resistor's impedance zv and the circuit's total impedance, so the limit voltage of the pressure sensitive resistor can be determined by the formula: Vc=VsZv/(Zs+Zv) VC--limit voltage;VS--surge voltage;ZV--the impedance of the pressure sensitive resistor;ZS--the total impedance of the circuit. The formula shows that when the large current gets through the Zv, the transient overvoltage lands on it mostly, so the voltage of the protected electric equipment is lower than the limit voltage of it, so this circuit can play the protection function. Figure The protection circuit composed of the pressure sensitive resistor



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