Ballast stabilization circuitry for eliminating moding or oscill

Details Ballast stabilization circuitry for eliminating moding or oscill Ballast stabilization circuitry for eliminating moding or oscill

1992-12-28

1995-01-17

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315209R, 315224, 315DIG5, 315DIG7, G05F 100

Patent

active

053828810

ABSTRACT:
A ballast stabilization arrangement is provided for minimizing or eliminating lamp current oscillation, or moding, of gas discharge lamps, such as fluorescent lamps, and a method for carrying out this arrangement is described. This is carried out by adding a frequency response zero to the current circuitry in a ballast. An example of this circuitry includes a feedback network where a sensed lamp current signal is compared with a reference signal by an error amplifier having a resistance placed in series with its feedback capacitance to implement the zero in the frequency response of the control circuit.

REFERENCES:
patent: 4346331 (1982-08-01), Hoge
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5041763 (1991-08-01), Sullivan et al.
patent: 5089751 (1992-02-01), Wong et al.

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