MERGED-STAGE HIGH EFFICIENCY HIGH POWER FACTOR HB-LED DRIVER WITHOUT ELECTROLYTIC CAPACITOR
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United States of America Patent
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Issued Date -
May 1, 2014
app pub date -
May 15, 2013
filing date -
May 15, 2012
priority date (Note) -
Abandoned
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Abstract
The present application relates to boost-resonant converter for driving high brightness LEDs (HB LED) that incorporates power factor correction (PFC) and does not require a bulky electrolytic capacitor. The new converter incorporates the PFC and the LED supplies into a single stage. The system allows a large voltage ripple across the intermediate energy storage capacitor reducing its value. Constant light output and dimming capability are obtained by variable frequency current control of the resonant converter. A high power factor is achieved by DCM boost front-end portion with controlled average output voltage. The converter is regulated by a digital controller that implements a variable-frequency variable duty ratio algorithm. Experimental results with a 15 W prototype verify near unity power factor operation, above 88% efficiency and constant lamp current over the entire operating range.
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