Patent ID: 7612974

Claim:
A backlight unit having a protection circuit using induced voltage detection, the backlight unit comprising: an inverter part including a primary coil configured to receive power and at least one secondary coil and to convert the power from the primary coil to AC power set beforehand; a lamp part including at least one lamp configured to receive the AC power from the inverter part to emit light; a detection part including conductors configured to detect voltages electromagnetically induced in the secondary coil; and an abnormality determining part configured to compare detection voltages from the detection part with a reference voltage set beforehand; wherein the primary coil and the secondary coil of the inverter part form one transformer; wherein the primary coil and the secondary coil are wound around a bobbin of the transformer and separated from each other; wherein the conductors of the detecting part are inserted into the bobbin of the transformer; wherein the conductors are separated from output terminals of the secondary coil by a predetermined insulating distance; and wherein the conductors are floating terminals among terminals of the transformer, and are not connected to either the primary coil or the secondary coil.