Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...
Patent
1976-06-02
1977-08-30
La Roche, Eugene
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural discharge devices and/or rectifiers in the supply...
315171, 315208, 315246, 315290, H05B 4130
Patent
active
040457095
ABSTRACT:
Increased color temperature of high pressure sodium vapor discharge lamps is provided by improved operating circuit for applying pulsed direct current to the lamp. The circuit includes a direct current ballast circuit having low ripple factor and a pulsing circuit comprising a controlled thyristor switch which operates to apply DC pulses to the lamp at a predetermined repetition rate and duty cycle. The described circuit provides for gradual increase in power applied to the discharge lamp during the starting interval and thereby avoids instability of lamp operation during that stage.
REFERENCES:
patent: 3780342 (1973-12-01), Grimshaw et al.
patent: 3886405 (1975-05-01), Kubo
patent: 3912969 (1975-10-01), Nakai et al.
patent: 3919592 (1975-11-01), Gray
General Electric Company
Greenberg Sidney
La Roche Eugene
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