Feedback design of a piezoelectric transformer-based half-bridge resonant CCFL inverter

Yu Kang Lo*, Kai Jun Pai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


The feedback loop design of a half-bridge resonant inverter based on a piezoelectric transformer (PT) for driving a cold cathode fluorescent lamp (CCFL) is presented in this paper. In order to stabilize the CCFL driving current and luminance, the PT-based resonant inverter incorporating a feedback compensator is designed to track the operating frequency. The dynamic equations and the small-signal model of the presented inverter system are established by using the harmonic approximation and harmonic balance procedures. The feedback compensation is performed by applying the derived small-signal block diagram. The complete mathematical analysis and design considerations are presented in detail. The experimental results agree with the theoretical predictions and confirm the validity of the proposed design approach.

Original languageEnglish
Pages (from-to)2716-2723
Number of pages8
JournalIEEE Transactions on Industrial Electronics
Issue number5
Publication statusPublished - 2007 Oct


  • Cold cathode fluorescent lamp (CCFL) inverter
  • Feedback compensator
  • Harmonic approximation
  • Harmonic balance
  • Piezoelectric transformer (PT)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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