Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural load device systems
Patent
1980-10-01
1982-09-07
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural load device systems
315 77, 340642, H05B 3703
Patent
active
043486134
ABSTRACT:
A lamp failure indicating circuit particularly useful for automotive vehicle application such as detecting failure of headlamps, stop lamps and/or turn signal lamps. The disclosed circuit embodiments monitor branch circuits each containing a lamp load and comprising an associated transformer. Each transformer comprises two coils disposed on a ferromagnetic torroidal core. One coil of each transformer is connected in the branch circuit of the associated lamp load, the coil and lamp load being in series, and being associated with a means which forms therewith a complete circuit path which is independent of the power supply which energizes the lamp load. The other coils of the transformers are connected in a circuit to which a test signal is applied with the result of the test indicating whether any of the lamps are failed.
REFERENCES:
patent: 3311779 (1967-03-01), Hartkorn, Jr.
patent: 3995262 (1976-11-01), France et al.
Hormel Ronald F.
Miesterfeld Frederick O. R.
Chrysler Corporation
LaRoche Eugene R.
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