Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Reexamination Certificate
2008-01-01
2008-01-01
Vo, Tuyet (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
C315S274000, C315S291000, C315S307000, C315S312000
Reexamination Certificate
active
11783370
ABSTRACT:
A multi-lamp driving system includes a driving apparatus and a current balancer having detection nodes. The protection apparatus includes at least a detection unit and a determining unit. The detection unit includes first impedance devices and a second impedance device. A first end of each first impedance device is coupled with the corresponding detection node. The second impedance device is coupled with a second end of each first impedance device. The cross-voltage between a first end and a second end of the second impedance device is relative to the sum of the voltage level of the detection nodes coupled with the first impedance devices. The determining unit coupled with the second impedance device of the detection unit outputs a protection signal to disable the driving apparatus according to the cross-voltage between the first and second ends of the second impedance device when at least one of the lamps malfunctions.
REFERENCES:
patent: 2005/0285548 (2005-12-01), Moyer et al.
patent: 2006/0119286 (2006-06-01), Huang et al.
Chen Wen-Sheng
Kuo Chien-Lung
Bacon & Thomas PLLC
Lite-On Technology Corporation
Vo Tuyet
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