Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1988-07-15
1990-08-28
Mis, David
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315244, 315308, 315DIG2, H05B 4136
Patent
active
049528491
ABSTRACT:
A controller operates in pre-ignition and ignition phases to obtain stable and reliable control of operation of a half-bridge DC-AC converter in a frequency range which is offset from a resonant frequency of an output circuit which includes a transformer and capacitors and which couples the converter to a fluorescent lamp load. The converter is supplied with a DC voltage from a switched-mode DC-DC supply of a pre-conditioner circuit which responds to a full-wave rectified AC voltage and which is supplied with pulse-width modulated gating pulses from the controller, preferably at a frequency which is the same as that of the converter. The controller monitors signals from the output circuit and pre-conditioner circuits and exercises control to reliable starting and highly efficient lamp operation and to obtain an in-phase proportional relationship of input voltage and current waveforms.
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patent: 4251752 (1981-02-01), Stolz
patent: 4453109 (1984-06-01), Stupp et al.
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patent: 4698554 (1987-10-01), Stupp et al.
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patent: 4717863 (1988-01-01), Zeiler
patent: 4763239 (1988-08-01), Ball
Fellows Mark W.
Toy Edmond
Wong John M.
Mis David
North American Philips Corporation
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