Soft-transition FSK dimmer for gaseous luminous tube lights

Details Soft-transition FSK dimmer for gaseous luminous tube lights Soft-transition FSK dimmer for gaseous luminous tube lights

1994-06-17

1997-09-16

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315DIG4, 315219, 315291, H05B 3702

Patent

active

056684444

ABSTRACT:
A dimmer oscillator for a high frequency luminous tube power supply including a frequency shiftable high frequency oscillator, a variable duty cycle low frequency oscillator operatively connected to the high frequency oscillator for controlling the high frequency oscillator between a first normal output operating frequency and a second higher frequency. A low pass filter within the high frequency supply whereby the supply output to a luminous tube load is reduced, when the oscillator is operating at the second higher frequency, to a low intensity ionization maintenance level. An integrator between the low and high frequency oscillators whereby the transition between the first nominal and second higher operating frequencies is smoothed to reduce acoustic noise and false GFI and OVP triggering. A frequency control diode between the low and high frequency oscillators to limit the lower frequency excursion, and to maintain oscillation of, the high frequency oscillator.

REFERENCES:
patent: 4612479 (1986-09-01), Zansky
patent: 4680508 (1987-07-01), Rucki
patent: 4704563 (1987-11-01), Aussey
patent: 4717863 (1988-01-01), Zeiler
patent: 4926097 (1990-05-01), Taek
patent: 5097181 (1992-03-01), Kakitani
patent: 5105127 (1992-04-01), Lavaud et al.
patent: 5302083 (1994-04-01), Bucher et al.
patent: 5406174 (1995-04-01), Slegers

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