Method and circuit for operating discharge lamp

Details Method and circuit for operating discharge lamp Method and circuit for operating discharge lamp

1980-10-20

1983-02-08

La Roche, Eugene

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315174, 315224, 315246, 315DIG7, 315226, H05B 4124

Patent

active

043731465

ABSTRACT:
A method of operating a high intensity discharge lamp having a pair of electrodes hermetically sealed within an arc tube, the method comprising frequency modulation of a carrier waveform in the kilohertz range to provide a variable frequency AC output, and applying the AC output across the electrodes of the lamp to thereby operate the lamp in a manner which minimizes or avoids acoustic resonance effects within the arc tube. The circuit includes an inverter having a first input provided by a DC power source and a drive input coupled to a square wave carrier generator which is frequency modulated by a ramp generator. The resulting variable frequency AC output of the inverter is then coupled across the lamp electrodes.

REFERENCES:
patent: 4060752 (1977-11-01), Walker

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