An electrolytic-free offline LED driver with a ceramic-capacitor-based compact SSC energy buffer

Minjie Chen, Yu Ni, Curtis Serrano, Benjamin Montgomery, David Perreault, Khurram Afridi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Scopus citations

Abstract

This paper presents the design and implementation of a compact ceramic-capacitor-based stacked switched capacitor (SSC) energy buffer for a single-stage offline 8-W 21-V output electrolytic-free LED driver. The elimination of the electrolytic capacitors can lead to a longer lifetime for the LED driver. Compared to earlier works, this design of the SSC energy buffer has a simpler ground-referenced gate drive circuit and eliminates the need for a separate precharge circuit. The prototype LED driver presented here uses a ceramic-capacitor-based SSC energy buffer with optimized capacitor sizing that provides substantially higher effective energy density than electrolytic capacitors. The improvement in energy density is achieved in part by a design approach which optimizes the ratio of the capacitance values of the capacitors in the SSC energy buffer. The prototyped SSC energy buffer achieves a round-trip efficiency of above 98%. The total passive volume of the ceramic capacitors in the prototype is less than half the volume of the electrolytic capacitors it replaces.

Original languageEnglish (US)
Title of host publication2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2713-2718
Number of pages6
ISBN (Electronic)9781479956982
DOIs
StatePublished - Nov 11 2014
Externally publishedYes

Publication series

Name2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

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