Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1993-12-13
1995-08-01
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315224, 315226, 315DIG5, 315DIG7, H05B 3702
Patent
active
054382432
ABSTRACT:
The present invention provide a an electronic ballast for instant start gas discharge lamps that is designed with a limited number of components thereby enabling it to be produced relatively inexpensively and to be operated more efficiently and more reliably. The invention provides quasi-voltage fed, half-bridge parallel resonant inverter. This inverter exhibits a voltage output characteristic in which the output power is inversely proportional to the load. The invention instantly starts in any order the multi-parallel configured gas discharge lamps. This invention balances the output current. This permits increasing the resonant frequency of the inverter to values higher than 50 Khz while maintaining a low crest factor and high efficiency. The invention is directed to a ballast for starting at least one gas discharge lamp, the ballast being composed of: a DC voltage input terminal device for receiving DC power from an external power supply; an inverter device, coupled to the input terminal device, for generating and outputting an alternating output voltage based on the DC power from the input terminal device; a transformer device, coupled to the inverter device, for transferring the alternating output voltage output by the inverter device to the at least one gas discharge lamp; and a ballasting device, coupled to the transformer device and the at least one gas discharge lamp, for limiting the lamp current output by the at least one gas discharge lamp that is passed back to the transformer device.
REFERENCES:
patent: 4438372 (1984-03-01), Zuchtriegel
patent: 4684851 (1987-08-01), Van meurs
patent: 4972124 (1990-11-01), Powers
Pascal Robert J.
Philogene Haissa
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