Backlight unit having protection circuit using center-tap

Details Backlight unit having protection circuit using center-tap Backlight unit having protection circuit using center-tap

2011-05-10

2011-05-10

Fureman, Jared J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

Reexamination Certificate

active

07940502

ABSTRACT:
There is provided a backlight unit having a protection circuit using a center-tap, the backlight unit including: a current balancing unit including a plurality of primary coils individually transmitting the lamp driving power from an inverter unit to the lamps, and a plurality of secondary coils each formed of one conductor having a center-tap, and receiving an electromagnetically induced voltage from each of the plurality of primary coils, the one end and the center-tap of each of the plurality of secondary coils connected in series with the one end and the center-tap of the neighboring secondary coil to form at least one closed loop and maintain current transmitted to each of the lamps balanced; a sensing unit sensing a variation in current of the closed loop and a variation in current of the primary coil from the current balancing unit; and a determination unit determining whether each of the lamps performs an abnormal operation or not.

REFERENCES:
patent: 6472876 (2002-10-01), Notohamiprodjo et al.
patent: 7075245 (2006-07-01), Liu
patent: 2002/0047619 (2002-04-01), Oura et al.
patent: 2008/0079440 (2008-04-01), Lee et al.
patent: 10-2008-0029188 (2008-04-01), None

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