Title:
【発明の名称】少なくとも一つのガス放電ランプを駆動する回路
Document Type and Number:
Japanese Patent JPH05508966
Kind Code:
A
Abstract:
A driving circuit for one or more gas discharge lamps (102, 104, 106) having heatable filaments (102A&B, 104A&B, 106A&B) includes: a self-oscillating, series-resonant oscillator (196, 198, 178, 180) for producing a high-frequency output voltage for application to the lamps via an output-coupling transformer (212); a resistive-capacitive divider (190, 192) for starting-up the oscillator after a first delay; a voltage boost IC (144) for causing the oscillator to produce a boosted output voltage when the voltage boost IC is activated and an unboosted output voltage when the voltage boost IC is unactivated; and a resistive-capacitive divider (170, 172) for starting-up the voltage boost IC after a second delay. The second delay is chosen to be substantially longer than the first delay, and the unboosted output voltage is arranged to be sufficient to heat the filament windings but insufficient to initiate striking in the lamp(s), and the boosted output voltage is arranged to be sufficient to initiate striking in the lamps, whereby the filaments are pre-heated prior to striking in the period between the first and second delays.
Inventors:
Connor, John Gee
Moisin, Mikhail S
Moisin, Mikhail S
Application Number:
JP50046893A
Publication Date:
December 09, 1993
Filing Date:
May 21, 1992
Export Citation:
Assignee:
Motorola Lighting Incorporated
International Classes:
H05B41/28; H05B41/282; H05B41/24; (IPC1-7): H05B41/24; H05B41/24; H05B41/29
Attorney, Agent or Firm:
Shinsuke Onuki (1 person outside)