Electric lamp and discharge devices: systems – With signal – indicator – or alarm – Plural load device systems
Patent
1986-04-08
1988-05-17
Dixon, Harold
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
Plural load device systems
315 82, 315129, 340641, 340642, H01J 160
Patent
active
047453397
ABSTRACT:
A lamp failure detecting device for automobile consists of a lamp circuit including a plurality of lamps connected in parallel, a current-detecting resistance connected to a power-supply source through the lamp circuit in series, a first voltage divider circuit including resistances to which a voltage divided by the current detecting resistance and the lamp circuit is applied a second voltage divider circuit including resistances to which a voltage supplied from the power-supply source is applied and a comparator circuit comparing the difference between the divided voltages in the voltage divider circuits to produce a a failure detection signal. Diodes are provided in the first and second voltage divider circuits respectively in the forward direction. Non-linearity of the current flowing through the lamps for the change of the power-supply voltage is corrected by the diodes.
REFERENCES:
patent: 3719937 (1973-03-01), Doyle
patent: 3735378 (1973-05-01), McNamee
patent: 3952229 (1976-04-01), Rekow
Doi Ryohei
Izawa Minoru
Kinoshita Ken-ichi
Suzuki Ritsuo
Dixon Harold
Fried Harvey D.
Kabushiki Kaisha Tokai Rika Denki Seisakusho
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