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    Discharge lamp driving circuit having resonant circuit defining two resonance modes

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    5914572.pdf (1.653Mb)
    Downloads: 65
    Publication Date
    1999-06-22
    Filing Date
    1997-06-19
    Inventor
    Lee, Fred C.
    Yamauchi, Tokushi
    Qian, Jinrong
    Metadata
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    Abstract
    An improved discharge lamp driving circuit of a charge-pump type capable of suppressing a ripple in an envelop of a lamp current at the time of dimming the lamp or at a low environmental temperature. The circuit includes an inverter having switching elements Q1 and Q2 for converting a voltage across a smoothing capacitor Ce into a high frequency power which is applied through a resonant circuit to the discharge lamp Ld. A capacitor Cin is connected to one end of the resonant circuit to vary a DC voltage of the output of the rectifier in accordance with a varying instantaneous value of the high frequency current or voltage appearing in the resonant circuit. A control circuit is provided to give a control signal for alternately turning on and off the switching elements Q1 and Q2. A feedback circuit FB is provided to modulate the control signal within a permissible range given to the control circuit in such a manner as to adjust the timing of turning on and off the switching elements Q1 and Q2 in a feedback manner based upon a lamp current detected by a current sensor SI, for reducing the ripple in the lamp current. A mixer MX is included to compensate for the lamp current in consideration of a dimmer signal Dim of dimming the lamp in order to suppress the ripple which would otherwise increase due to the dimming of the lamp.
    Assignee
    Virginia Tech Intellectual Properties, Inc.
    Matsushita Electric Works, Ltd.
    Patent Number
    5914572
    Application Number
    8878821
    Source URL
    http://pimg-fpiw.uspto.gov/fdd/72/145/059/0.pdf
    Primary/U.S. Class
    315/307
    Other/U.S. Class
    315/209R
    315/DIG4
    315/DIG7
    CPC Class
    H05B41/28
    H05B41/2858
    H05B41/3921
    Y10S315/04
    Y10S315/07
    Patent Type
    utility
    URI
    http://hdl.handle.net/10919/72390
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