The principle of the ceiling lamp changing light
A short time after power failure, the chip power supply capacitor rely on stored energy to maintain, temporarily not reset, and started again, again to get a pulse input, output, the control, different lamp is luminous.
the chip will give a high end addition count level pulse counter plus one corresponding change potential output, low output chip three through a relay or a thyristor control light bulb
The lamp there are three lights, there are three relays or triac control alone, the controller has an internal function similar to the CD40110 counter chip, switching power supply, power supply at the same time to the chip
