Electric lamp and discharge devices: systems – Current and/or voltage regulation
Patent
1991-03-07
1993-03-30
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
315 82, 315175, 315224, 315DIG7, H05B 3700, H05B 4100
Patent
active
051987279
ABSTRACT:
Miniature high pressure arc lamps containing a substantial pressure of xenon, in addition to metal halide and mercury, can provide instant light at turn-on and are suitable for automotive headlamps. The xenon aggravates convection which causes arc-bowing and overheating of the envelope above the arc. By operating the lamps on unidirectional current upon which a frequency-modulated high frequency ripple has been imposed, acoustic resonance is used to straighten out the arc. The use of unidirectional current permits a reduction in cost and size of the ballast control circuits operated from auto storage battery. Frequency modulation of the ripple broadens the band allowing acoustic straightening of the arc. Additional control of the arc plus reduction of cataphoresis may be achieved through a horizontal magnetic field at the arc, transverse to current flow.
REFERENCES:
patent: 3746920 (1973-07-01), Flatley
patent: 4117453 (1978-09-01), Hodgson et al.
patent: 4749913 (1988-06-01), Stuermer et al.
patent: 4904907 (1990-02-01), Allison et al.
patent: 5047695 (1991-09-01), Allen et al.
Allen Gary R.
Allison Joseph M.
Davenport John M.
Hansler Richard L.
King Kenneth S.
Corwin Stanley C.
Dinh Son
General Electric Company
Hawranko George E.
LaRoche Eugene R.
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