Discharge lamp lighting device

Details Discharge lamp lighting device Discharge lamp lighting device

1983-09-02

1985-03-05

Dixon, Harold

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

315207, 315283, 315DIG7, H05B 3900, H05B 3700

Patent

active

045033595

ABSTRACT:
Disclosed is a discharge lamp lighting device which comprises a series closed-loop circuit including an AC power supply, a ballast having an inductance, and a discharge lamp, and a switch circuit in parallel to the discharge lamp. The switch circuit is turned on when the voltage across the discharge lamp is reduced to zero, and then turned off when the current flowing in the switch reaches a predetermined value. The switch circuit thus repeats its on-off operation every half cycle of the voltage across the discharge lamp. The electromagnetic energy is stored in the inductance of the ballast when the switch circuit is on, and the stored electromagnetic energy is superimposed on the source voltage and applied to the discharge lamp when the switch circuit is turned off, thus reigniting the discharge lamp every half cycle. This makes it possible to light directly a discharge lamp having a lamp voltage approximate to the source voltage.

REFERENCES:
patent: 3875459 (1975-04-01), Remery et al.
patent: 3997814 (1976-12-01), Toho
patent: 4380719 (1983-04-01), DeBijl et al.
patent: 4447763 (1984-05-01), Iyama et al.

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