Inverter arrangement employing resonant capacitive elements dire

Details Inverter arrangement employing resonant capacitive elements dire Inverter arrangement employing resonant capacitive elements dire

1997-05-20

1998-12-01

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315240, 315244, 315DIG7, H05B 3700

Patent

active

058443746

ABSTRACT:
A circuit arrangement for operating a high pressure discharge lamp having a full bridge commutator network. A capacitor across each of four commutator switches forms a tuned circuit together with a ballast coil for soft switching. To counteract the core material of the ballast coil from vibrating audibly during lamp operation about no more than 15% of the commutation cycle elapses between turning off the first of the four commutator swithes and turning on the last of the four commutator switches.

REFERENCES:
patent: 4415838 (1983-11-01), Houkes
patent: 4748383 (1988-05-01), Houkes
patent: 5166579 (1992-11-01), Kawabata et al.
patent: 5341068 (1994-08-01), Nerone
patent: 5434479 (1995-07-01), Ohnishi et al.
patent: 5463281 (1995-10-01), Linssen
patent: 5565743 (1996-10-01), Yamashita et al.

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