Fault detection in a LED bias circuit

Details Fault detection in a LED bias circuit Fault detection in a LED bias circuit

2006-07-11

2006-07-11

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

Reexamination Certificate

active

07075766

ABSTRACT:
The present invention detects single faults that would cause the current flowing through the light source to increase by a significant amount over the intended value. When the fault is a small leakage path to Ground potential from the light source cathode, it can be detected while maintaining operation of the light source within eye safety limits. In addition, the fault may be detected without activating the light source.

REFERENCES:
patent: 4504776 (1985-03-01), Haville
patent: 5563898 (1996-10-01), Ikeuchi et al.
patent: 6188498 (2001-02-01), Link et al.
patent: 6704183 (2004-03-01), Stafford
patent: 6747420 (2004-06-01), Barth et al.

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