Ignitional run circuit that immediately applies only a DC voltag

Details Ignitional run circuit that immediately applies only a DC voltag Ignitional run circuit that immediately applies only a DC voltag

1996-03-04

1998-06-23

Pascal, Robert

Electric lamp and discharge devices: systems

Plural power supplies

Diverse-type current supplies

315289, 315307, H05B 3702

Patent

active

057709246

ABSTRACT:
To largely, or entirely inhibit glow discharges during the start-up or run-on phase (Ta) of a high-pressure discharge lamp, the lamp is operated in a second time period (T2) immediately after ignition (T1) with continuous direct current during which the electrode of the lamp which then functions as an anode has reached emission temperature; in a third time period (T3), the polarity of the direct current is reversed and the other electrode, which now will function as an anode, is heated to emission temperature; thereafter, alternating current energy is supplied to both electrodes, typically in frequencies between 90 and 150 Hz. A suitable second time period (T2) can be about 2 to 21/2 second, the third time period (T3) being shorter. The total warm-up time may extend to a minute or more; current being supplied during the second, third and subsequent periods is usually higher, for example by a factor of 1.5 of the normal or rated operating current.

REFERENCES:
patent: 4587460 (1986-05-01), Murayama et al.
patent: 4709188 (1987-11-01), Roberts
patent: 5103143 (1992-04-01), Daub
patent: 5444336 (1995-08-01), Ozawa et al.
patent: 5465029 (1995-11-01), Hanazaki et al.
Electronic ballast unit made by Philips, product designation EMC 035S and C 070S, respectively, published Oct. 1994.

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