access icon free Flicker-free transformerless LED driving circuit based on quadratic buck PFC converter

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.

Inspec keywords: driver circuits; light emitting diodes; power convertors; power factor correction

Other keywords: power 7 W; flicker-free transformerless LED driving circuit; second-order line frequency current ripple; light emitting diode; quadratic buck PFC converter; power factor correction converter; high step-down transformer; EN61000-3-2 standard; output buck dc-dc converter

Subjects: Power electronics, supply and supervisory circuits; Light emitting diodes

References

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      • 1. Limits for Harmonic Current Emissions (Equipment Input Current ≤ 16 A Per Phase), (IEC 61000-3-2, Part 3-2, 2005, 3rd edn).
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2014.2454
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