Electronic ballast having a flyback cat-ear power supply

Details Electronic ballast having a flyback cat-ear power supply Electronic ballast having a flyback cat-ear power supply

2005-05-02

2008-10-07

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S291000

Reexamination Certificate

active

07432661

ABSTRACT:
An electronic ballast for driving a gas discharge lamp includes a rectifier to convert an AC mains input voltage to a rectified voltage, a valley-fill circuit for producing a DC bus voltage, an inverter for converting the DC bus voltage to a high-frequency AC voltage for driving the lamp, a control circuit for controlling the inverter, and a flyback cat-ear power supply for supplying current to the inverter when the rectified voltage is less than a predetermined level. The flyback cat-ear power supply also provides power to the control circuit. Preferably, the flyback cat-ear power supply draws current only when the inverter is not drawing current directly from the AC mains, so as to make the input current to the ballast substantially sinusoidal. The result is a ballast having substantially improved power factor and THD. Also, the ballast operates more efficiently because the flyback cat-ear ear power supply supplies excess energy not needed by the ballast control circuitry to the inverter to be used to drive the lamp.

REFERENCES:
patent: 5986901 (1999-11-01), Weng
patent: 6061259 (2000-05-01), DeMichele
patent: 6111368 (2000-08-01), Luchaco
patent: 6259614 (2001-07-01), Ribarich et al.
patent: 6275397 (2001-08-01), McClain
patent: 6452344 (2002-09-01), MacAdam et al.
patent: 6486616 (2002-11-01), Liu et al.
patent: 6639369 (2003-10-01), Ribarich
patent: 6674248 (2004-01-01), Newman et al.
patent: 6784622 (2004-08-01), Newman et al.
patent: 6791279 (2004-09-01), Shearer et al.
patent: 6956336 (2005-10-01), Ribarich
patent: 7068016 (2006-06-01), Athari
patent: 7088081 (2006-08-01), Takahashi et al.
patent: 7148664 (2006-12-01), Takahashi et al.
patent: 7285919 (2007-10-01), Newman et al.
patent: 2003/0001516 (2003-01-01), Newman, Jr. et al.
patent: 2004/0183477 (2004-09-01), Newman, Jr. et al.
patent: 2006/0175983 (2006-08-01), Crouse et al.
patent: 6-6979 (1994-01-01), None
USPTO, International Search Report and Written Opinion of PCT Application claiming priority from the present application, Sep. 19, 2006, 12 pages.
Youk-Sik Youn et al., “A Unity Power Factor Electronic Ballast For Fluorescent Lamp having Improved Valley Fill and Valley Boost Converter”, Power Electronics Specialists Conference, 1997, PESC '97, Record., 28thAnnual IEEE, St. Louis, MO, USA, Jun. 22-27, 1997, New York, NY, USA, IEEE, US, vol. 1, Jun. 22, 1997, pp. 53-59.

Affiliated with

Also associated with

Rating

Electronic ballast having a flyback cat-ear power supply does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic ballast having a flyback cat-ear power supply, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic ballast having a flyback cat-ear power supply will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3997191