| US 7,612,974 B2 | ||
| Backlight unit having protection circuit using induced voltage detection | ||
| Hyo Young Kim, Gyunggi-do (Korea, Republic of); Sung Hun Oh, Gyunggi-do (Korea, Republic of); and Jong Rak Kim, Gyunggi-do (Korea, Republic of) | ||
| Assigned to Samsung Electro-Mechanics Co., Ltd., Gyunggi-Do (Korea, Republic of) | ||
| Filed on Nov. 28, 2007, as Appl. No. 11/946,700. | ||
| Claims priority of application No. 10-2006-0119049 (KR), filed on Nov. 29, 2006. | ||
| Prior Publication US 2008/0137248 A1, Jun. 12, 2008 | ||
| Int. Cl. H02H 3/08 (2006.01); H02H 9/02 (2006.01) | ||
| U.S. Cl. 361—93.1 | 5 Claims |
| 1. 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.
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