Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Plural cathodes or heaters in the load device
Patent
1987-08-12
1988-03-08
Dixon, Harold
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Plural cathodes or heaters in the load device
315104, 315224, 315226, 315DIG2, 315DIG5, 315DIG7, H05B 3904
Patent
active
047301473
ABSTRACT:
For the operation of warm start gas discharge lamps upon employment of an electronic ballast wherein the gas discharge lamp lies parallel to the effective capacitance of a series-resonant circuit and has its heater coils incorporated into this series-resonant circuit. An isolating switch is provided in series with the effective capacitance. This isolating switch interrupts the shunt to the lamp and, thus, the heater coil current as well, as soon as the lamp has ignited. It is assured in this way that the current flowing in the shunt to the lamp which otherwise represents a dissipated power is suppressed. Particular significance is accorded to this method when the effective capacitance of the series-resonant circuit is executed variably during the starting interval phase with the assistance of temperature-dependent resistors or is executed with time delayed electronic switches for the control of the lamp voltage.
REFERENCES:
patent: 4647817 (1987-03-01), Fahnrich et al.
Dixon Harold
Siemens Aktiengesellschaft
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