Backlight unit having protection circuit using induced...

Details Backlight unit having protection circuit using induced... Backlight unit having protection circuit using induced...

2007-11-28

2009-11-03

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

Reexamination Certificate

active

07612974

ABSTRACT:
There is provided a backlight unit that determines whether a lamp performs an abnormal operation by detecting a voltage that is induced in a power conversion transformer without using a complicated and expensive detection circuit. A backlight unit having a protection circuit using induced voltage detection according to an aspect of the invention includes an inverter part including a primary coil receiving power and at least one secondary coil converting the power from the primary coil to AC power set beforehand, a lamp part including at least one lamp receiving the AC power from the inverter part to emit light, a detection part including conductors detecting voltages electromagnetically induced in the secondary coil, and an abnormality determining part comparing detection voltages from the detection part with a reference voltage set beforehand.

REFERENCES:
patent: 1020010002829 (2001-01-01), None
patent: 1020030097393 (2003-12-01), None
patent: 1020050005905 (2005-01-01), None
patent: 1020050120879 (2005-12-01), None
patent: 1020060016224 (2006-02-01), None
patent: 1020060019268 (2006-03-01), None

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