Abstract: A power supply system and a method for providing power supply to electrical equipment from conventional lighting circuits in buildings are disclosed. The invention is intended to provide power supply to electrical equipment, without the need of conventional alternating current (AC) power supply power socket outlets. Instead, it obtains electrical power from existing lighting points. An embodiment of the invention is disclosed for achieving this without disrupting normal operation of turning on and off existing lighting sources. The present invention consists a wall switch unit and a lighting source control unit. The wall switch unit controls the level or waveforms of AC voltage supply to the lighting source control unit while the lighting source control unit detects the AC voltage level or waveforms for switching on or off a lighting source.

Abstract: A power supply system and a method for providing power supply to electrical equipment from conventional lighting circuits in buildings are disclosed. The invention is intended to provide power supply to electrical equipment, without the need of conventional alternating current (AC) power supply power socket outlets. Instead, it obtains electrical power from existing lighting points. An embodiment of the invention is disclosed for achieving this without disrupting normal operation of turning on and off existing lighting sources. The present invention consists a wall switch unit and a lighting source control unit. The wall switch unit control s the level or waveforms of AC voltage supply to the lighting source control unit while the lighting source control unit detects the AC voltage level or waveforms for switching on or off a lighting source.

Abstract: An apparatus for controlling AC supply switches is disclosed, in which the AC supply is switched between a lamp load (1) by means of a power triac (2) and a circuit which converts the AC supply voltage to a DC voltage by using a bridge circuit and a voltage limiting circuit for powering auxiliary control circuits. A triggering circuit which actuates power triac (2) in response to a switch control signal (21) comprises an opto-coupled triac driver (14). The apparatus can also be adapted to perform AC supply switching for multiple lamp loads.