Ballast for high intensity discharge lamps

Details Ballast for high intensity discharge lamps Ballast for high intensity discharge lamps

1988-04-05

1990-02-27

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315226, 315307, 315DIG7, H05B 4136

Patent

active

049049038

ABSTRACT:
An electronic ballast for high intensity discharge lamps is taught. A high speed electronic switch gates voltage across the lamp only for that period of time when the amount of resultant current flow will not adversely affect the lamp or the switch. At that point, the voltage is gated off for a period of time, after which the cycle repeats. This scheme eliminates the need for any inductive, resistive or capactive element, either saturable or conventional, in the post-ignition operation of the lamp, except perhaps for auxiliary functions. The elimination of such inductive elements results in a highly efficient, low cost electronic ballast having reduced electromagnetic and radio interference emissions.

REFERENCES:
patent: 3745411 (1973-07-01), Polman et al.
patent: 3898006 (1975-08-01), Kimura et al.
patent: 3906302 (1975-09-01), Wissboom
patent: 4001633 (1977-01-01), van Tongeren et al.
patent: 4219760 (1980-08-01), Ferro
patent: 4289993 (1981-09-01), Harper et al.
patent: 4388563 (1983-06-01), Hyhin
patent: 4392087 (1983-07-01), Zansky
patent: 4412156 (1983-10-01), Ota
Gruber, Robert P. et al, "Power Electronics For A1-Kilowatt Arcjet Thruster"; NASA Technical Memorandum 87340 AIAA-86-1507.

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