If you want to intelligently control the lights in your home, smart switches are essential components. Different from the traditional switch panel, in order to realize the intelligent “switch”, it is necessary to ensure that the “control chip” integrated in the intelligent switch is always on. When applying, it is necessary to select the appropriate type of smart switch according to the wiring in the home. At present, smart switches are mainly divided into two categories, namely “Neutral-Live wire smart switches” and “single live wire smart switches”.
The principle of single live wire intelligent switch
The single live intelligent switch control circuit takes electricity directly through the live wire, and forms a loop through the neutral wire connected to the lamp, and the lamp has a current passing through, that is, a loop is formed. Since a single live wire smart switch integrates a variable resistor and is connected in series with the lamp, the on and off of the lamp is often controlled by adjusting the resistance. Open circuit, there is still a small current in the line to power the “smart switch control chip”), the light is turned off. When the resistance is adjusted to very small, the light turns on. Since there is still a small current in the line after the light is turned off, the single-live wire version switch often has “flickering” after the light is turned off, that is, the phenomenon of “ghost fire”.
In order to avoid the occurrence of “ghost fire” in the process of using a single live wire smart switch, it is necessary to connect capacitors in parallel at both ends of the lamp, and use the capacitor’s “storage” and “discharge” principles to return the discharge of the filter capacitor on the lamp drive to the parallel capacitor through the parallel capacitor. In the circuit, so as to solve the problem of turning off the lights and flickering.
Post time: Nov-11-2022