Discharge lamp operating circuit

Details Discharge lamp operating circuit Discharge lamp operating circuit

H - Electricity

05

B

315/41

H05B 41/14 (2006.01)

Patent

CA 1115339

ABSTRACT OF THE DISCLOSURE Circuit operating from a direct current source applies DC pulses to high pressure sodium vapor lamp to improve the color properties of the lamp. In one embodiment, the circuit includes a charging circuit comprising a first inductor, a diode and a capacitor connected across the DC source, and a discharging circuit comprising a second inductor of lower inductance than the first inductor, a controlled thyristor switch and sodium vapor lamp connected across the capacitor, and a timing circuit for periodically turning on the switch at predetermined intervals. A third inductor and serially connected diode are connected across the discharging circuit to prevent excessive voltage across the controlled switch and to provide for control of lamp wattage with respect to changes in lamp voltage.

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