An input dc-voltage, usually obtained from an AC-mains voltage through a pre-connected rectifier and Power Factor Corrector, is converted by a series connection of two power transistors to an ac-voltage, which, via an LC section is presented to a gas discharge lamp....http://www.google.com.tw/patents/US7180251?utm_source=gb-gplus-share專利 US7180251 - Electronic power circuit for gas discharge lamps
