Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy control of an electric discharge device in...
Patent
1977-05-26
1978-07-18
Smith, Alfred E.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy control of an electric discharge device in...
315159, 315207, 315208, 315224, 315283, H05B 3702, H05B 4123
Patent
active
041018095
ABSTRACT:
Pulse operating circuit for high intensity gaseous discharge lamps is provided with improved lamp starting device. The circuit comprises a direct current supply, a transistor switch in series with a ballast inductor and a lamp across the DC supply, an SCR switch connected across the inductor, a control circuit connected to the transistor switch for applying DC pulses to the lamp at a predetermined repetition rate and duty cycle, a sensing circuit for sensing the voltage across the inductor, and a variable SCR firing control circuit connected to the SCR and the first mentioned control circuit and responsive to the sensing circuit to control the firing of the SCR for limiting the peak current through the transistor switch during the lamp starting and warm-up interval. To improve the operation of a starting aid circuit employed with a circuit of the above type, a second control circuit is connected to the first mentioned control circuit to provide for increased "on" time of the transistor switch during the lamp starting interval, after which the transistor switch "on" time is automatically reduced to normal operating level.
REFERENCES:
patent: 3621331 (1971-11-01), Barron
patent: 3624447 (1971-11-01), Nutley et al.
patent: 3917976 (1975-11-01), Nuckolls
patent: 4045709 (1977-08-01), Morais
patent: 4051411 (1977-09-01), Knoble et al.
General Electric Company
Greenberg S.
Roberts Charles F.
Smith Alfred E.
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