Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1999-01-22
2000-08-22
Berhane, Adolf Deneke
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 41, 363132, H02M 3335
Patent
active
061082155
ABSTRACT:
An inverter circuit having dual converters for driving a fluorescent lamp comprising a pulse width modulator coupled to receive a feedback signal indicative of current in the fluorescent lamp. The pulse width modulator generates driving signals that are received by a synchronously switching voltage regulator having a high side driver and a low side driver. A self-resonant converter is coupled between the synchronously switching voltage regulator and the fluorescent lamp and generates a voltage signal for illuminating the fluorescent lamp. The self-resonant converter includes a transformer having a primary winding and at least one secondary winding, a capacitor coupled in parallel with the primary winding, and a full bridge circuit. The full bridge circuit may include four switching transistors, such as MOSFETs coupled in an H-configuration to the primary winding and the capacitor. A zero voltage detector controls switching of the synchronously switching voltage regulator based on voltage input to the self-resonant converter. A timer circuit is coupled to the self-resonant converter and the zero voltage detector, and outputs signals to control the frequency of oscillation in the self-resonant converter based on the signals from the self-resonant converter and the zero voltage detector.
REFERENCES:
patent: 4887007 (1989-12-01), Almering et al.
patent: 5416387 (1995-05-01), Cuk et al.
patent: 5430641 (1995-07-01), Kates
patent: 5568041 (1996-10-01), Hesterman
patent: 5930121 (1999-07-01), Henry
patent: 5982161 (1999-11-01), Nguyen et al.
Mark Jordan, et al., Unitrode Application Notes, "Resonant Fluorescent Lamp Converter Provides Efficient and Compact Solution," pp. 3-370 to 3-376, Fig. 10 to Fig. 15. "No Date ".
J. O'Connor, Unitrode Application Notes, Dimmable Cold-Cathode Fluorescent Lamp Ballast Design Using the UC 3871, pp. 1 to 15. "No Date ".
Unitrode Application Notes, "Resonant Fluorescent Lamp Driver," pp. 1 to 5. Oct. 1994.
Cummings John
Kates Barry K.
Berhane Adolf Deneke
Bertani Mary Jo
Dell Computer Corporation
Terrile Stephen A.
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