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The overvoltage protection circuit

2016-09-10 06:08  
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The overvoltage protection circuit
When the external voltage does not exceed the set E voltage Vs, negative resistance light-emitting diode VD1 it cutoff, VT is cutoff because of no base current, relay J does not pull in, and its normally closed contact J1-1 is closed to provide supply for the load RL. Once the external voltage E exceeds the set voltage Vs, VD1 gets conduction, VD1 emitting light to show overvoltage. The the capacitor C1 connected to VD1 in parallel is anti - electromagnetic interference, and it can be selected in the range of 0.01μF ~ 0.1μF.