The present invention provides an apparatus for operating an electronic lamp from an AC line (10) and has a rectifier circuit (12), a power coupling circuit (18), a starting circuit (22), a resonant circuit (24), a feedback circuit (26), a driving circuit (28), and an output coupling circuit (30). The...http://www.google.ca/patents/US5426348?utm_source=gb-gplus-sharePatent US5426348 - High efficiency ballast for operation of electronic lamps
