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The household appliance over-voltage protector circuit

2016-09-14 19:52  
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The household appliance over-voltage protector circuit
The working principle of the device circuit is shown in figure 1. After the AC mains is stepped down and limited by capacitor C1, it is then rectified by VD1 and VD2, and then filtered by C2, finally, a 12v or so DC voltage is acquired. When the grid is normal, the regulated LED VDW can't be broken down and conducted, at this moment, triode VT is in the blocked state, the dual-way SCR VS is triggered and conducted, so the appliance connected with the outlet XS is getting power and work. If the voltage of the grid is rising up suddenly, over 250V, the voltage on the central point of RP will break down VDW.