© The Institution of Engineering and Technology
A flicker-free transformerless light emitting diode (LED) driving circuit based on a quadratic buck power factor correction (PFC) converter is proposed. It combines a cascaded input buck PFC converter and an output buck dc–dc converter with a single switch. The proposed LED driving circuit can not only achieve high PFC to comply with the EN61000-3-2 standard and low output voltage without a high step-down transformer, but also reduces second-order line frequency current ripple flowing through the LED to eliminate light flicker of the LED. Experimental results of a 7 W prototype are presented to verify the analysis results of the proposed converter.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2014.2454
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