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    Method and apparatus for automatic average current mode controlled power factor correction without input voltage sensing

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    5920471.pdf (1.236Mb)
    Downloads: 80
    Publication Date
    1999-07-06
    Filing Date
    1997-08-29
    Inventor
    Lee, Fred C.
    Rajagopalan, Jayendar
    Nora, Paolo
    Metadata
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    Abstract
    A method for preparing power factor control integrated circuits which generate linear pulse width modulation (PWM) waveforms is presented. The method of pulse width modulation waveform generation involves providing a capacitor; fast charging the capacitor; and controlling a discharge rate of the capacitor to ensure a constant switching period and a linear PWM waveform. The method is applicable for any single-phase ac/dc converter topology that performs power factor correction. Unlike conventional techniques which utilize three feedback loops, the method of the present invention reduces the total number of feedback loops to two, eliminates input voltage sensing and achieves the same objective. This method results in significant integrated circuit simplification, such as elimination of multiplier, squarer and divider circuits in the control integrated circuit and reduces the cost of the integrated circuit.
    Assignee
    SGS-Thomson Microelectronics S.R.L.
    Virginia Tech Intellectual Properties, Inc.
    Patent Number
    5920471
    Application Number
    8921062
    Source URL
    http://pimg-fpiw.uspto.gov/fdd/71/204/059/0.pdf
    Primary/U.S. Class
    323/288
    Other/U.S. Class
    363/89
    363/48
    363/80
    CPC Class
    H02M1/4225
    Y02B70/126
    Patent Type
    utility
    URI
    http://hdl.handle.net/10919/72392
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