초록 ▼

The discharge lamp energizing arrangement of this invention comprises a starter and a generator adapted to maintain a discharge current in the lamp. The generator includes a first circuit arranged to couple in series a D.C. voltage source, a first switch and a second switch. When the first switch is

The discharge lamp energizing arrangement of this invention comprises a starter and a generator adapted to maintain a discharge current in the lamp. The generator includes a first circuit arranged to couple in series a D.C. voltage source, a first switch and a second switch. When the first switch is closed the second is open and vice versa. A second circuit arranged to couple an inductance and the lamp in series is connected in parallel with the second switch. The switches are operated by a control means which combines signals received from an oscillator and a comparator so as to regulate the current flow in the lamp. The generator appears as a source of stabilized current for any load which is applied thereto and may just as well be employed for a lighting fixture as for energizing the luminous points of a matrix display board.

대표청구항 ▼

An energizing arrangement for a discharge lamp comprising a first generator capable of providing a voltage pulse adapted to trigger discharge in the lamp and a second generator adapted to maintain a discharge current in the lamp, the second generator including a first electric circuit so arranged as

An energizing arrangement for a discharge lamp comprising a first generator capable of providing a voltage pulse adapted to trigger discharge in the lamp and a second generator adapted to maintain a discharge current in the lamp, the second generator including a first electric circuit so arranged as to couple in series a first D.C. voltage source, a first switch and a second switch, said first and second switches being arranged in a manner such that when the first switch is closed the second is open and vice versa and a second electric circuit, so arranged as to couple an inductance and said lamp in series, connected in parallel across said second switch, said switches being operated by a first control means energized by an alternating signal having a fixed period T1 provided by an oscillator and means being provided to measure a value representative of the current flow in the lamp in order to compare the representative value with a reference value provided by a second DC voltage source and to furnish a signal indicating equality when said values are substantially identical, said first control means employing the equality signal and placing said first switch initially in its closed state during a first time period Ta which extends from the beginning of said fixed period T1 until appearance of the equality signal then in its open state during a second time period Tb which ends at the end of said fixed period T1 said first switch being operated in accordance with a cyclic relationship Ta/T1 controlling current flow in the lamp said first generator which provides a voltage pulse adapted to trigger discharge in the lamp including a third switch connected in parallel to the lamp terminals and operated by a second control means itself operated by said first control means, said second control means being arranged so that said third switch is closed at the switching on of said energizing arrangement then opens at the first occasion that said first switch passes from the closed state to the open state.