To provide new and improved digital control of electronic ballasts using an AC power line as a communication medium.
A system for establishing communications between a central lighting controller and a series of electronic dimming ballasts uses an AC power supply line as a communication medium. A MOSFET, which is switched by a control circuit, selectively shorts the AC power line when a rectified version of the power line signal indicates that the power line signal approaches a zero crossing to create notches in the AC power signal. A simple receiver in each of the ballasts detects the presence or absence of notches in the power signal and interprets the result as digital data indicating a desired dimming level for each of the ballasts. The ballasts the adjust their light outputs accordingly.
COPYRIGHT: (C)2009,JPO&INPIT
John Jay Dernobsec
Deepak Shet
| JP4100499A | ||||
| JP2004534459A | ||||
| JP7046760A |
Kazumasa Kumagai