Electricity: measuring and testing – Electric lamp or discharge device – Electric lamp
Patent
1996-02-29
1998-02-10
Karlsen, Ernest F.
Electricity: measuring and testing
Electric lamp or discharge device
Electric lamp
340642, G08G 109
Patent
active
057173354
ABSTRACT:
An improved electric bulb short detection apparatus for a traffic signal controller capable of preventing an erroneous detection of an electric bulb short which is caused due to a voltage variation and the like, which includes an electric power control unit for driving a traffic signal light in response to an alternating current voltage supplied thereto; a voltage comparison circuit for comparing the the outputted voltage from an AC voltage source voltage with a reference voltage; a current detection unit for detecting a current of the electric power control unit in response to a comparison output signal from the voltage comparison circuit and for digitally-converting the current; and a central processing unit for judging whether an electric bulb is short by comparing a detection current value outputted from the current detection unit at every control step with a reference value and for controlling an electric power control circuit.
REFERENCES:
patent: 4295079 (1981-10-01), Otsuka
patent: 4330778 (1982-05-01), Yamazaki
patent: 4451822 (1984-05-01), Verse
patent: 5034659 (1991-07-01), Taniguchi
patent: 5387909 (1995-02-01), Neel
patent: 5581229 (1996-12-01), Hunt
Karlsen Ernest F.
LG Industrial Systems Co. Ltd.
Solis Jose M.
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