Apparatus for controlling operation of gas discharge devices

Details Apparatus for controlling operation of gas discharge devices Apparatus for controlling operation of gas discharge devices

2005-11-08

2005-11-08

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S293000, C315S224000, C315S362000, C315S2090SC, C315S291000, C315SDIG004, C315SDIG007

Reexamination Certificate

active

06963178

ABSTRACT:
A power controller for fluorescent lamp dimming is disclosed, using all digital internal and external programmable controls. A specific ASIC is described. A gate array and microcomputer share parallel functions with fast sub-functions carried out by the gate array and slower sub-functions carried out by a micro-processor. Circuits are provided for automatic shut down when a high frequency ground fault is detected; for connecting the filaments of gas discharge lamps in a series/parallel circuit for driving the load as close to resonance as possible but in an inductive mode; and for developing a dead time between high side and low side switches which is related to transformer current, switch current, bridge voltage or bridge voltage dv/dt.

REFERENCES:
patent: 5287008 (1994-02-01), Pahr
patent: 5469028 (1995-11-01), Nilssen
patent: 5500792 (1996-03-01), Jeon et al.
patent: 5569984 (1996-10-01), Holtslag
patent: 5691605 (1997-11-01), Xia et al.
patent: 5757141 (1998-05-01), Wood
patent: 5877926 (1999-03-01), Moisin
patent: 6002213 (1999-12-01), Wood

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