Embedded single-inductor bipolar-output DC-DC converter in class-D amplifier for low common noise

Shin Hao Chen, Kuei Liang Lin, Shao Siang Ng, Tzu Chi Huang, Ke-Horng Chen, Ying Hsi Lin, Tsung Yen Tsai, Chao Cheng Lee

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This paper proposes a high efficiency class-D amplifier (CDA) with embedded single-inductor bipolar output (SIBO) power module. The characteristics of SIBO converter's bipolar outputs not only suppress equivalent common-mode noise but also remove several large external bulky components in conventional boost supply CDA systems. Since bipolar outputs in the SIBO provide independent driving capability, CDA is capable of operating in both single-ended and bridge-tide load configurations. Furthermore, the proposed dynamic voltage boosting technique adjusts the SIBO output voltage level according to the CDA's output level with 5% power efficiency improvement. Peak total harmonic distortion plus noise performance is 0.012%. Peak power efficiency of SIBO and CDA is 89% and 93.2%, respectively.

Original languageEnglish
Article number7127026
Pages (from-to)3106-3116
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume31
Issue number4
DOIs
StatePublished - 1 Apr 2016

Keywords

  • Class-D audio amplifier
  • Dynamic voltage boosting (DVB)
  • Single-inductor bipolar-output (SIBO) converter
  • SoC application

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