Lamp driving circuit

Details Lamp driving circuit Lamp driving circuit

2009-04-13

2011-12-27

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

C315S224000, C315S225000, C315S226000, C315S277000, C315S278000, C315S308000

Reexamination Certificate

active

08084954

ABSTRACT:
The present invention relates to a lamp driving circuit capable of achieving miniaturization by using a safe insulation type multi-output transformer. The lamp driving circuit in accordance with the present invention includes a rectification unit for rectifying an input voltage; a PFC (Power Factor Correction) unit for enhancing a power factor of a voltage rectified by the rectification unit and converting the rectified voltage into a DC voltage; a switching unit for switching the DC voltage of the PFC unit in order to convert the DC voltage into a square wave voltage; an insulation transformer unit which includes a transformer to secure safe insulation by including an input terminal and a ground terminal of one primary side and all output terminals of first and second secondary sides each of which includes two output terminals at sides facing each other and a resonant capacitor, and outputs a plurality of driving voltages which have the same amplitude and drive a plurality of lamps respectively by receiving the square wave voltages outputted from the switching unit; and an insulation feedback unit for sensing any one of the plurality of driving voltages and transmitting the driving voltage to the switching unit positioned at the primary side of the transformer, wherein the insulation feedback unit insulates the primary side of the transformer from the secondary side of the transformer.

REFERENCES:
patent: 7274156 (2007-09-01), Hsueh et al.
patent: 7365501 (2008-04-01), Ushijima et al.
patent: 7477023 (2009-01-01), Shimura et al.
patent: 7492107 (2009-02-01), Wang et al.
patent: 2004/0263092 (2004-12-01), Liu
patent: 2005/0105305 (2005-05-01), Sawada et al.
patent: 2007/0228987 (2007-10-01), Miyazaki et al.
patent: 2008/0303447 (2008-12-01), Fukumoto
patent: 2009/0039796 (2009-02-01), Lin et al.

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