Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1998-12-31
2000-10-24
Philogene, Haissa
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315291, 315247, 315362, 315DIG4, 315DIG7, G05F 100
Patent
active
061372404
ABSTRACT:
A universal ballast control circuit allows a universal ballast to accommodate a gas discharge lamp within a relatively wide wattage range using a low-speed microcontroller. The control circuit drives the ballast to start, run and dim a particular lamp type by providing a control voltage signal to a conventional inverter MOSFET driver to effect dynamic and selective changes in the duty cycle and the frequency of the inverter signal. In one aspect of the invention, the control circuit comprises a generator for generating a periodic analog voltage signal, a source for producing a DC voltage signal, a controller which includes a low-speed microcontroller for varying the frequency of the periodic analog voltage signal and the magnitude of the DC voltage signal, and a comparator for comparing the periodic analog voltage signal and the DC voltage signal to produce a control voltage signal. In another aspect of the invention, the control circuit comprises a generator for generating a periodic analog voltage signal, a controller for controlling the shape of the periodic analog voltage signal, and a comparator for comparing waveforms of the periodic analog voltage signal with the waveforms of two DC threshold voltages to generate a control signal. The present invention allows for the control circuit to be powered by a power supply signal either derived from an inverter half-bridge MOSFET driver, extracted from a boost inductor of the boost converter or generated by an appropriately configured dedicated miniature switch mode power supply. Finally, control circuit can be utilized to drive PFC circuity in a feedback configuration to regulate the level of boost converter output voltage signal.
REFERENCES:
patent: 4277728 (1981-07-01), Stevens
patent: 4506195 (1985-03-01), Elms
patent: 4584488 (1986-04-01), Towers et al.
patent: 4672300 (1987-06-01), Harper
patent: 4952849 (1990-08-01), Fellows et al.
patent: 5039921 (1991-08-01), Kakitani
patent: 5043635 (1991-08-01), Talbott et al.
patent: 5426350 (1995-06-01), Lai
patent: 5515261 (1996-05-01), Bogdan
patent: 5565123 (1996-10-01), Wolff
patent: 5569984 (1996-10-01), Holtslag
patent: 5583402 (1996-12-01), Moisin et al.
patent: 5825223 (1998-10-01), Mader
patent: 5872429 (1999-02-01), Xia et al.
Lumion Corporation
Philogene Haissa
LandOfFree
Universal ballast control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Universal ballast control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal ballast control circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1967312