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

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

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
Electronics Letters — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

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.


    1. 1)
      • 1. Limits for Harmonic Current Emissions (Equipment Input Current ≤ 16 A Per Phase), (IEC 61000-3-2, Part 3-2, 2005, 3rd edn).
    2. 2)
    3. 3)
    4. 4)
    5. 5)

Related content

This article has following corresponding article(s):
in brief
This is a required field
Please enter a valid email address