Discharge lamp operating circuit

Details Discharge lamp operating circuit Discharge lamp operating circuit

H - Electricity

05

B

315/53

H05B 41/30 (2006.01)

Patent

CA 1093143

410D 542 ABSTRACT OF THE DISCLOSURE Increased color temperature of high pressure sodium vapor discharge lamps is provided by improved operating circuits 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.

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