Discharge lamp ballast circuits

Details Discharge lamp ballast circuits Discharge lamp ballast circuits

1975-11-24

1976-09-28

La Roche, Eugene

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315105, 315DIG5, H05B 4116

Patent

active

039834492

ABSTRACT:
A ballast circuit for a discharge lamp uses simply a capacitor in series with a relatively small inductor the capacitative reactance being between 24 and 55 times the inductive reactance. At these values the third harmonic distortion is unexpectedly low, while the crest factor (ratio of peak to r.m.s. current) is still within acceptance values. Because the inductor is small the efficiency of the circuit is high, and its cost and weight reduced. The capacitance/inductance ratio can be equated to the ratio of the frequency of the tuned circuit to the supply frequency, and on this basis the preferred range is defined by 5 to 71/2 times supply frequency.

REFERENCES:
patent: 2056629 (1936-10-01), Uyterhoeven et al.
patent: 2170447 (1939-08-01), Edwards
patent: 2256224 (1941-09-01), Thayer
patent: 2351499 (1944-06-01), Freeman
patent: 2482894 (1949-09-01), Bird
patent: 2695375 (1954-11-01), Mendenhall et al.
patent: 3781597 (1973-12-01), Nomura et al.

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