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Wire connection incandescent lamp life extension switch circ

2016-08-01 05:21  
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Wire connection incandescent lamp life extension switch circuit
A wire connection incandescent lamp's life extension switch is shown. As its warm-up time is long, the service life of the bulb E is long. When the switch S is closed, 220V AC only has the negative half-cycle and powers bulb E through the VD1 and S. At this time, it is under the semi-pressure warm-up state. AC’s positive half-cycle charges the capacitor C through the VD2 and R1 and R2 divider until the voltage across C rises to more than 3V. Then the regulator thyristor VS is breakdown to conduct VT. Therefore, the bulb E is under total pressure to light.