H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/37
H05B 41/26 (2006.01) H05B 41/28 (2006.01) H05B 41/298 (2006.01)
Patent
CA 1337211
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.
605486
Fellows Mark W.
Toy Edmond
Wong John M.
Fellows Mark W.
Fetherstonhaugh & Co.
N.v. Philips Gloeilampenfabrieken
Toy Edmond
Wong John M.
LandOfFree
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