Direct drive ballast circuit

Electric power conversion systems – Current conversion – With starting arrangement

Patent

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Details

363 97, 363 37, 331113A, 315205, 315220, 315224, 315DIG5, 315DIG7, H02M 5293

Patent

active

041886607

ABSTRACT:
A direct drive electronic ballast circuit suitable for a fluorescent lamp load includes a high frequency oscillator inverter circuit having a tuned output circuit coupled to a load and to a drive circuit series connected to the load and dependent upon current flow therein. The high frequency oscillator inverter circuit is also coupled to a pulsed DC potential source which is shunted by a charge storage and isolating circuit energized by a feedback rectifier circuit which supplies energy whenever the potential from the pulsed DC potential source decreases below a given reference level. A relaxation type oscillator is coupled to the high frequency oscillator inverter circuit and provides a starting capability therefore.

REFERENCES:
patent: 4104715 (1978-08-01), Lawson
patent: 4109307 (1978-08-01), Knoll
patent: 4127795 (1978-11-01), Knoll
patent: 4127893 (1978-11-01), Goepel

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