Apparatus for detecting abnormal states in a discharge tube circ

Details Apparatus for detecting abnormal states in a discharge tube circ Apparatus for detecting abnormal states in a discharge tube circ

1996-10-17

1999-09-14

Kinkead, Arnold

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315308, 315274, 315119, 345212, H05B 3703

Patent

active

059527919

ABSTRACT:
Abnormal states in a high-voltage cable connected to a backlight of a liquid crystal display are detected. This invention includes: a secondary winding of a transformer; a discharge tube connected to the secondary winding of the transformer; means connected to the discharge tube for detecting a tube current; means connected to the secondary winding of the transformer for detecting a transformer current; and abnormal-state detection means for comparing a value of the tube current detected by the tube current detection means with a value of the transformer current detected by the transformer current detection means and interrupting a power supply if a difference greater than a predetermined value is detected. Thus, a case of lighting delayed due to the darkness effect can also be dealt with.

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