DC operated electronic ballast for fluorescent light

Details DC operated electronic ballast for fluorescent light DC operated electronic ballast for fluorescent light

1995-08-18

1998-05-12

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315DIG7, 315324, 315225, 315308, 363124, H05B 4136

Patent

active

057511209

ABSTRACT:
A device for operating lamps, such as fluorescent lamps includes an input protection circuit, a filter, a DC to DC converter, a power output stage, a lamp connecting circuit and a control circuit. The control circuit includes a pulse width modulator, a multivibrator and a start/stop controller. The pulse width modulator varies the duty cycle of a control signal supplied to the DC to DC converter based on a feedback signal from the DC to DC converter. The multivibrator assists in the control of the DC to DC converter. The start/stop controller initiates the operation of the power output stage when an output of the DC to DC converter reaches a predetermined level and halts the operation of the power output stage if a failure is detected.

REFERENCES:
patent: 3767970 (1973-10-01), Collins
patent: 4132925 (1979-01-01), Schmutzer et al.
patent: 5111118 (1992-05-01), Fellows et al.

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