Apparatus for controlling operation of gas discharge devices
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United States of America Patent
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Nov 8, 2005
Grant Date -
N/A
app pub date -
Dec 7, 1999
filing date -
Dec 7, 1998
priority date (Note) -
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status (Latency Note)
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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.
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