Fluorescent lamps with current-mode driver control

Details Fluorescent lamps with current-mode driver control Fluorescent lamps with current-mode driver control

1996-06-14

1998-02-17

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315224, 315DIG4, H05B 3702

Patent

active

057194742

ABSTRACT:
A system wherein light from a fluorescent lamp is dimmed by modulating the pulse-width of current pulses. A current-command signal is applied to a lamp driver in response to a voltage-level corresponding to a given, selectable level of desired lamp brightness. The lamp driver operates as a flyback AC power source that advantageously uses a FET switch to decouple the lamp and a resonant bridge, with the current-sampling process. The circuit samples only the inductor current while the FET switch is active. Because the sample is decoupled from the lamp and bridge, this sampling provides particularly tight control of the regulation process needed to control the incoming noise and transients that affect the power supplied to the lamps. The lamp driver a can also operate as a synchronously-driven resonant forward converter that senses the current actually supplied to the lamp and responds to changes in the fluorescent lamp's condition since the lamp is coupled to the circuit.

REFERENCES:
patent: 5428265 (1995-06-01), Booth, Jr. et al.
patent: 5481163 (1996-01-01), Nakamura et al.

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