High efficiency supply circuit for an electric discharge lamp

Details High efficiency supply circuit for an electric discharge lamp High efficiency supply circuit for an electric discharge lamp

1975-02-24

1976-10-12

Grimm, Siegfried H.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Plural cathodes or heaters in the load device

315106, 315244, 315DIG5, H05B 41233

Patent

active

039860760

ABSTRACT:
A ballast impedance for an electric discharge lamp comprises an inductor and a capacitor connected in series with the lamp across AC input terminals. The lamp operating voltage is less than 20 percent of the AC supply voltage. The values of L and C are chosen so that the ballast has a net capacitive character and to provide a resonance between 3.5 and 4 times the frequency of the AC supply voltage.

REFERENCES:
patent: 2056629 (1936-10-01), Uyterhoeven et al.
patent: 2482894 (1949-09-01), Bird

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