Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Discharge device and/or rectifier in the primary circuit of...
Patent
1981-11-27
1984-04-03
Dixon, Harold
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Discharge device and/or rectifier in the primary circuit of...
315207, 315208, 315226, 315244, 315307, 315DIG7, H05B 3700
Patent
active
044410530
ABSTRACT:
An electronic ballast circuit for operating high intensity gas discharge tubes such as high pressure sodium, high pressure mercury and metal halide tubes, as well as ordinary fluorescent tubes. In the preferred embodiment, an inductance and a capacitance are connected in series with the load across the dc supply, with a solid state switch between the junction of the inductance and capacitance and the other side of the load, and a control circuit for the switch to operate the switch at a high frequency such as 20,000 hertz. Alternative embodiments omitting the capacitance and utilizing a transformer for the inductance are especially suited for less expensive units and for emergency lighting use. Power supply circuits with switching operated in conjunction with the previously mentioned switch provide for regulation of lamp output during start-up and for compensating changes in supply voltage coordinated with lamp aging.
REFERENCES:
patent: 3753071 (1973-08-01), Engel et al.
patent: 3889152 (1975-06-01), Bodine et al.
patent: 4251752 (1981-02-01), Stolz
Data-Design Laboratories
Dixon Harold
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