Electric lamp and discharge devices: systems – Surge generator or inductance in the supply circuit – Circuit interrupter in the inductance circuit
Patent
1980-09-17
1982-08-03
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Surge generator or inductance in the supply circuit
Circuit interrupter in the inductance circuit
307157, 315283, 315289, 315DIG2, H05B 4123
Patent
active
043429483
ABSTRACT:
A converter circuit for addition to the existing lamp operating circuitry of a high pressure mercury lamp consisting of an existing series ballast inductor and a power factor connecting capacitor connected across the input terminals of the existing lamp operating circuit includes inductance arranged to be connected to the ballast inductor so as to adjust the resultant series inductance to a value suitable for a sodium lamp, and an igniter portion coupled to the converter inductance. The igniter portion operates to apply ignition voltage to the sodium lamp during at least part of the time that the converter circuit is supplied with power. Protective circuitry is coupled to the converter inductance to block or limit high frequency voltage pulses which could otherwise reach the ballast inductor.
REFERENCES:
patent: 4005336 (1977-01-01), Casella
patent: 4210850 (1980-07-01), Britton
David Engineering Limited
LaRoche Eugene R.
O'Connell Robert F.
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