Electric lamp and discharge devices: systems – With automatic shunt and/or cutout – Supply circuit current and/or potential actuated switch
Patent
1990-01-24
1991-11-26
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With automatic shunt and/or cutout
Supply circuit current and/or potential actuated switch
315DIG7, 315360, 315119, H05B 4100
Patent
active
050685708
ABSTRACT:
A lighting circuit for a metallic halide lamp for vehicular headlight applications is disclosed. Included are a pair of input terminals between which a battery is connected for feeding the lamp via a normally open relay switch which is closed upon energization of an associated relay coil. The relay coil is connected in series with an operator actuated lamp switch and a protection switch, so that both lamp switch and protection switch must be closed to energize the relay coil and hence to close the relay switch. The protection switch is automatically opened to deenergize the relay coil when the battery develops overvoltage or when the lamp will not glow upon closure of the lamp switch. In an alternate embodiment, the protection switch is also opened in response to the development of overcurrent or overvoltage by a d.c. voltage booster circuit included in the lighting circuit.
REFERENCES:
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patent: 4207500 (1980-06-01), Duve
patent: 4240009 (1980-12-01), Paul
patent: 4337418 (1982-06-01), Walz
patent: 4450384 (1984-05-01), Krokaugger
patent: 4667131 (1987-05-01), Nilssen
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patent: 4766350 (1988-08-01), Husgen
patent: 4797599 (1989-01-01), Ference
Matsumoto Akihiro
Murata Atsuhiko
Oda Goichi
Ozaki Akiyoshi
Shidoh Masaya
Koito Manufacturing Co. Ltd.
LaRoche Eugene R.
Zarabian A.
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