Stable high frequency high-pressure discharge lamp lighting devi

Details Stable high frequency high-pressure discharge lamp lighting devi Stable high frequency high-pressure discharge lamp lighting devi

1994-07-19

1996-02-13

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315307, 315224, 315DIG5, H05B 3702

Patent

active

054913861

ABSTRACT:
A lighting device for a high-pressure discharge lamp includes an inverter circuit for converting a DC voltage into an AC voltage using a pair of switching elements. The switching elements have a switching frequency for starting the high-pressure discharge lamp that is higher than a resonance frequency of a series resonance circuit connected in parallel with the discharge lamp. However, in a lighted state of the discharge lamp, the switching frequency is lower than the resonance frequency of the resonance circuit and is within a frequency range where acoustic resonance does not occur. The lighted state of the high-pressure discharge lamp is maintained by a voltage across a capacitor in the series resonance circuit.

REFERENCES:
patent: 4868463 (1989-09-01), Dorleijn et al.
patent: 4935669 (1990-06-01), Nilssen
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5233273 (1993-08-01), Waki et al.

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