Electric lamp and discharge devices: systems – Discharge device and/or rectifier in the supply circuit – Plural discharge devices and/or rectifiers in the supply...
Patent
1977-05-12
1978-10-17
Smith, Alfred E.
Electric lamp and discharge devices: systems
Discharge device and/or rectifier in the supply circuit
Plural discharge devices and/or rectifiers in the supply...
315208, 315224, 315287, 315307, 315DIG7, H05B 4136
Patent
active
041211367
ABSTRACT:
Apparatus for feeding a discharge lamp such as a mercury vapor lamp mounted in series with a choke from a direct current source comprising a chopper of direct current including an electronic switch and a detector of current intensity mounted in series with the choke. A first comparator compares the intensity of the current to a maximum level for opening the switch when the maximum level is reached and a second comparator compares the intensity of the current to a minimum value for closing the switch when the minimum value is reached. The lamp choke and current detector are connected in series with one another and a diode is mounted in parallel therewith and is oriented in the direction to pass current from the negative terminal towards the positive terminal of the direct current source.
REFERENCES:
patent: 3165668 (1965-01-01), Harpley
patent: 3222572 (1965-12-01), Powell
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 3919592 (1975-11-01), Gray
Fournier Jean-Claude
Hermitte Albert
Etat Francais
Roberts Charles F.
Smith Alfred E.
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