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The auto reset over-voltage protection circuit

2016-09-13 02:23  
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The auto reset over-voltage protection circuit
The circuit in figure 5.41 includes the power supply, trigger starting and control circuit, it controls ON/OFF of the load R1 with the help of the dual-way thyristor ZN6346. Once the AC power supply voltage is too high, the voltage on point A of the stable element LN5314 will be rising up, which makes the single-way thyristor 2N5060 conducting and transistor MPS6581 break down, so is the thyristor 2N6239, so the main dual-way thyristor is broken down, the load is protected from being broken due to over-voltage.