Discharge lamp operating circuit

Details Discharge lamp operating circuit Discharge lamp operating circuit

1987-11-30

1989-03-28

Moore, David K.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

315224, 315226, 315DIG2, 315291, 315209R, H05B 3900

Patent

active

048167207

ABSTRACT:
A discharge lamp operating circuit includes at least a discharge lamp, a condenser and four switches. The condenser is charged and discharged through the discharge lamp by the turn-on and turn-off of the switches so that an AC current is caused to flow through the discharge lamp to operate the discharge lamp. A time required for the complete charging and discharging of the condenser is selected to be longer than a time scheduled for the charging and discharging of the condenser in one period. A switching frequency f.sub.0 at the time of heating of the discharge lamp and a switching frequency f at the time of operating of the discharge lamp has a relation of 2.ltoreq.f/f.sub.0 .ltoreq.10.

REFERENCES:
patent: 3978368 (1976-08-01), Tomura et al.
patent: 4060752 (1977-11-01), Walker
patent: 4698553 (1987-10-01), Nilssen
patent: 4700287 (1987-10-01), Nilssen
patent: 4734624 (1988-03-01), Nagase et al.

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