Constant wattage electric ballast circuit for lamp

Details Constant wattage electric ballast circuit for lamp Constant wattage electric ballast circuit for lamp

1998-02-02

2000-01-04

Vu, David H.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315308, H05B 3702

Patent

active

060113634

ABSTRACT:
A constant wattage electronic ballast circuit for lamp comprises a circuit for producing a voltage feedback signal substantially proportional to voltage of the lamp. A diode function generator processes the voltage feedback signal so as to produce a processed signal which, within sequential bands of lamp voltage, varies less for a specified variation of lamp voltage in a higher voltage band than in a lower voltage band. A circuit produces a current feedback signal substantially proportional to current in the lamp. A circuit for controlling lamp current comprises a circuit for summing the processed signal with the current feedback signal to create a summed signal, and a circuit for adjusting lamp current in response to the difference between the summed signal and a reference signal.

REFERENCES:
patent: 5371440 (1994-12-01), Liu et al.
Graeme et al., "Operational Amplifiers: Design and Applications," McGraw Hill Book Company: New York (1971), pp. 251-258 and title and copyright pages.

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