Single switch electronic ballast with low in-rush current

Details Single switch electronic ballast with low in-rush current Single switch electronic ballast with low in-rush current

1996-08-14

1999-02-16

Shingleton, Michael

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

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

315244, 315247, 315DIG7, H05B 3702

Patent

active

058724303

ABSTRACT:
An electronic ballast (200) includes a rectifier circuit (20), a clamp inductor (44), an electronic switch (62), a control circuit (60) for driving the electronic switch (62), an energy storage capacitor (34), a first diode (38), a second diode (50), a clamping capacitor (58), and an output circuit (80). 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 (80) has a resonant inductor (82), a resonant capacitor (92), and a DC blocking capacitor (98). The ballast (200) provides power factor correction, low in-rush current, and high frequency power for fluorescent lamps, but requires only a single electronic switch (62) and a single clamp inductor (44).

REFERENCES:
patent: 4075476 (1978-02-01), Pitel
patent: 4109307 (1978-08-01), Knoll
patent: 4277728 (1981-07-01), Stevens
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patent: 4500812 (1985-02-01), Roche
patent: 4555753 (1985-11-01), Takahashi
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patent: 5057749 (1991-10-01), Nilssen
patent: 5115347 (1992-05-01), Nilssen
patent: 5229690 (1993-07-01), Ohnishi et al.
patent: 5258692 (1993-11-01), Jones
patent: 5399944 (1995-03-01), Konopka et al.
patent: 5453665 (1995-09-01), Konopka

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