Discharge lamp auxiliary circuit with dI/dt switching control

Details Discharge lamp auxiliary circuit with dI/dt switching control Discharge lamp auxiliary circuit with dI/dt switching control

1976-03-01

1977-11-29

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315224, 315243, 315283, 315307, 315DIG5, 315DIG7, H05B 4126, H05B 4136

Patent

active

040607526

ABSTRACT:
A variable frequency AC source drives a gas discharge lamp which is connected in parallel with the capacitance of a series resonant circuit. The polarity of the voltage applied to the resonant circuit is commutated at such times as the rate-of-change of current flow in the resonant circuit is at or near zero. The source frequency is thus maintained at or near the circuit resonant frequency to maintain high output voltage when the lamp is starting or reigniting.
The polarity is also commutated at such times as the current flow from the source reaches a predetermined level. Lamp current is thus controlled in the running mode.

REFERENCES:
patent: 3628086 (1971-12-01), Nuckolls
patent: 3648106 (1972-03-01), Engel et al.
patent: 3710177 (1973-01-01), Ward
patent: 3919592 (1975-11-01), Gray

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