High pressure sodium vapor lamp having D.C. resistive ballast ci

Details High pressure sodium vapor lamp having D.C. resistive ballast ci High pressure sodium vapor lamp having D.C. resistive ballast ci

1984-12-06

1986-09-02

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

315207, 315208, 315241R, 315244, 315245, 315239, H05B 3700, H05B 3900, H05B 4114

Patent

active

046098496

ABSTRACT:
Various embodiments of direct current (D.C.) ballasting circuits for low wattage high pressure sodium (HPS) vapor lamps are disclosed. In one ballast embodiment a negative going high voltage pulse is applied directly to the H.P.S. lamp cathode during the starting operation and the ballast circuit preferentially diverts a major portion of the HPS lamp current around a high-voltage transformer during normal operation so as to reduce the resistive heating of the transformer. In a second ballast embodiment, capacitors are arranged into voltage multiplying circuit for generating the high D.C. starting voltage along with diodes that reduce the power dissipation of the ballast circuit.

REFERENCES:
patent: 3248590 (1966-04-01), Schmidt
patent: 4051412 (1977-09-01), Knoble et al.
patent: 4223247 (1980-09-01), Jacobs et al.
patent: 4316124 (1982-02-01), Verwimp et al.
patent: 4382210 (1983-05-01), Buhrer
patent: 4555647 (1985-11-01), Leskovec et al.

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