High-pressure discharge lamp operating circuit

Details High-pressure discharge lamp operating circuit High-pressure discharge lamp operating circuit

1985-11-05

1989-02-07

Moore, David K.

Electric lamp and discharge devices: systems

Plural power supplies

Plural diverse pulsating or a.c. supplies

315 86, 315175, 315DIG7, H05B 3700

Patent

active

048034061

ABSTRACT:
A high-pressure discharge lamp operating circuit performs a low-frequency AC operating at an early stage of operating and thereafter performs a high-frequency AC operation or DC operation during the steady-state of lamp operation. This circuit comprises a circuit for effecting a transition from the low-frequency AC operation to the high-frequency AC operation or DC operation either at the time which is a predetermined time period after the ignition of discharge before the high-pressure discharge lamp reaches the steady-state of operation, or after having detected at least one of predetermined lamp characteristics, thereby providing a stabilized light output.

REFERENCES:
patent: 3700960 (1972-10-01), Lake
patent: 4107579 (1978-08-01), Bodine, Jr. et al.
patent: 4151445 (1979-04-01), Davenport et al.
patent: 4587460 (1986-05-01), Murayama et al.

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