Single switch ballast with integrated power factor correction

Details Single switch ballast with integrated power factor correction Single switch ballast with integrated power factor correction

1996-04-04

1997-12-02

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch in the primary circuit of the supply...

315247, 315307, 315224, 315DIG7, 315DIG5, 315DIG4, H05B 3702

Patent

active

056940068

ABSTRACT:
An electronic ballast (200) includes a rectifier circuit (20), an energy storage inductor (38), a power switch (58), a control circuit (50) for driving the power switch (58), a clamp diode (46), a voltage clamping capacitor (54), a bulk capacitor (34), and an output circuit (70) for providing power to one or more fluorescent lamps (100). In a preferred embodiment, the rectifier circuit (20) includes a full-wave diode bridge (22) and a high frequency filter capacitor (24), and the output circuit (70) has a resonant inductor (72), a resonant capacitor (82), and a dc blocking capacitor (88). The ballast (200) provides power factor correction and high frequency power for fluorescent lamps, but requires only a single power switch (58) and a single energy storage inductor (38).

REFERENCES:
patent: 2994012 (1961-07-01), Negrete
patent: 3922582 (1975-11-01), Pitel
patent: 4072878 (1978-02-01), Engel et al.
patent: 4081718 (1978-03-01), Kaneda
patent: 4194143 (1980-03-01), Farkas et al.
patent: 4254362 (1981-03-01), Tulleners
patent: 4257088 (1981-03-01), Nilssen
patent: 5144204 (1992-09-01), Nerone et al.
patent: 5367224 (1994-11-01), Pacholok

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