Ballast structure for central high frequency dimming apparatus

Details Ballast structure for central high frequency dimming apparatus Ballast structure for central high frequency dimming apparatus

1978-12-05

1980-06-10

Smith, Alfred E.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural load device systems

315 97, 315223, 315224, 315244, 315DIG4, H05B 4126, H05B 41392

Patent

active

042074975

ABSTRACT:
An illumination control system for gas discharge lamps which can be dimmed is provided in which a central inverter produces sinusoidal output voltage at about 23 kHz. The amplitude of the inverter output is adjustable to dim the lamps. A transmission line consisting of spaced wires having respective thick insulation sheaths distributes the high frequency power to remotely located assemblies of ballasts and lamps. A high power factor rectifier network is disclosed for providing a d-c input to the inverter from the 50/60 Hz mains. Several ballasts are disclosed, which consist principally of circuits using passive linear components. Some of the ballasts disclosed are conjugate ballasts which are those made of complex conjugate impedances which resonate with or near the input power frequency. Some ballasts disclosed are non-linear when the lamp is out in order to limit the open circuit voltage. The ballasts disclosed all have the following characteristics:

REFERENCES:
patent: 3422309 (1969-01-01), Spira et al.
patent: 3573544 (1971-04-01), Zonis et al.
patent: 3663940 (1972-05-01), Schwarz
patent: 3936696 (1976-03-01), Gray

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