Over-voltage protection circuit uses the two-way trigger diode to trigger the two-way thyristor

Published:2011/7/8 5:50:00 Author:Christina | Keyword: Over-voltage, protection, two-way, trigger diode, two-way thyristor | From:SeekIC

The over-voltage protection circuit which is composed of the two-way trigger diode and the two-way thyristor is as shown in figure 1. When the voltage is normal, the voltage of the two-way trigger diode is smaller than the turning voltage, the VD1 will not conduct, the two-way thyristor is in the cut-off state, the load RL can get the power. When the power supply transient voltage is the over voltage, the voltage which is added on the two-way trigger diode is larger than the tuning voltage, so VD1 conducts and triggers the two-way thyristor to conduct it, so the load RL is away from the overvoltage damage. Figure 1 The over-voltage protection circuit



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