Lighting system with variable control current sensing ballast

Details Lighting system with variable control current sensing ballast Lighting system with variable control current sensing ballast

1993-06-02

1994-06-21

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315219, 315DIG4, 315DIG7, G05F 100

Patent

active

053230906

ABSTRACT:
The present invention is directed to an electronic ballast system including one or more gas discharge lamps which have two unconnected single electrodes each. The system is comprised of a housing unit with electronic circuitry and related components and the lamps. The system accepts a.c. power and rectifies it into various low d.c. voltages to power the electronic circuitry, and to one or more high d.c. voltages to supply power for the lamps. Both the low d.c. voltages and the high d.c. voltages can be supplied directly, eliminating the need to rectify a.c. power. The device switches a d.c. voltage such that a high frequency signal is generated. Because of the choice of output transformers matched to the high frequency (about 38 kHz) and the ability to change frequency slightly to achieve proper current, the device can accept various lamp sizes without modification. The ballast can also dim the lamps by increasing the frequency. The device can be remotely controlled. Because no filaments are used, lamp life is greatly extended.

REFERENCES:
patent: 4392087 (1983-07-01), Zansky
patent: 4876485 (1989-10-01), Fox
patent: 5039920 (1991-08-01), Zonis
patent: 5105127 (1992-04-01), Lavaud et al.

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