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The lighting lamp auto switch circuit of dual-way thyristor

2016-08-11 06:37  
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The lighting lamp auto switch circuit of dual-way thyristor
The switch controls the 200W lamps, the power supply is 220V, when the light is 100lx or so, the left and right lamps will turn on/off automatically. The LDR is in a high resistance when it's dark outside, the voltage on the input terminal of the threshold switch is 0.7 time higher than 2-pin, and its output terminal is in a high resistance, so the forward half circle of the gird voltage is passable after it is distributed by the transistor, and in each half-circle, there generates a trigger pulse, which makes the load get power. When the light is strong (higher than 100lx), the output terminal of the threshold switch is negative.