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Incandescent lamp life extension switch circuit(5)

2016-08-01 03:27  
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Incandescent lamp life extension switch circuit(5)
The figure is as shown, it is another connection way of the incandescent lamp life extension switch, it has two functions: one is it can start up with half wave depressurization when it is connected to the power supply, then it will turn into total pressure feeding after the filament preheats enough; the other is this circuit will transfer to half wave depressurization feeding automatically, once the mains power network voltage is 20V higher than the 220V standard voltage, it can delay the service life of incandescent lamp effectively.