Patent ID: 7825606
Filing Date: 2010-11-02
Classification: H02M,Y02B

Abstract:
1. A fluorescent lamp driver for providing optimal voltage output to a control system and a florescent lamp of a Liquid Crystal Display (LCD), comprising: a multi-switch converting circuit having an input and an AC output; a Power Factor Correction (PFC) circuit which outputs a high-voltage direct current to said input of said of said multi-switch converting circuit; a resonant circuit having a resonant inductor and a resonant capacitor; a power transformer having a primary winding and a secondary winding having a first and second output lines and a third output line between said first and second output lines, wherein said primary winding of said power transformer is connected with said AC output of said multi-switch converting circuit; a resonant circuit connected with said secondary winding of said power transformer, wherein said resonant circuit comprises a resonant inductor and a resonant capacitor connected with said resonant inductor in series; a step-up transformer connected in parallel with said power transformer, wherein said step-up transformer has a primary winding connected with said first and second output lines of said secondary winding of said power transformer, said resonant inductor and said resonant capacitor in series, and a secondary winding connected with said fluorescent lamp as a voltage output thereof; and a rectifying circuit, which is connected with said secondary winding of said power transformer, comprising a first diode, a second diode and an auxiliary capacitor, wherein said auxiliary capacitor, which is connected with an output of said rectifying circuit for providing optimal voltage output to said control system, has a first end connected to said third output line of said secondary winding of said power transformer and a second end connected to said first and second output lines of said secondary winding of said power transformer, wherein said first diode is connected between said second output line of said secondary winding of said power transformer and said second end of said auxiliary capacitor, wherein said second diode is connected between said first output line of said secondary winding of said power transformer and said second end of said auxiliary capacitor.