Electric lamp and discharge devices: systems – Surge generator or inductance in the supply circuit
Patent
1986-09-29
1987-07-28
Dixon, Harold
Electric lamp and discharge devices: systems
Surge generator or inductance in the supply circuit
315177, 315242, 315244, 315276, H05B 3700
Patent
active
046834044
ABSTRACT:
A lighting apparatus which provides high voltage pulses for starting a high pressure sodium lamp. The apparatus includes two capacitors, two blocking diodes, a voltage sensitive symmetrical switch, and multiple resistances across which pulses are distributed. The aforementioned elements are electrically connected together and with a tapped ballast reactor so that one of the capacitors charges through an impedance in the negative half-cycle, and thereafter, when line voltage goes positive, the other capacitor charges through an impedance equal to the sum of the multiple resistances. When the voltage of the capacitors reaches a predetermined voltage exceeding the breakdown voltage of the voltage sensitive symmetrical switch, the capacitors discharge. This discharge, because of an autotransformer relationship within the reactor, produces a high voltage pulse of predetermined height and width once per each cycle of the source voltage.
REFERENCES:
patent: 3522475 (1970-08-01), Hashimoto
patent: 3963958 (1976-06-01), Nuckolls
patent: 4072878 (1978-02-01), Engel et al.
patent: 4415837 (1983-11-01), Sodini
patent: 4461982 (1984-07-01), Fahnrich
Cooper Industries
Dixon Harold
Maxwell R. L.
Scott E. E.
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