Self-calibrated knee voltage detector with 99.65% high accuracy for AC charger system in 0.5 μm 500 v UHV process

Chao Chang Chiu*, Moris Lin, Chih Wei Chang, Che Hao Meng, Hsiang An Yang, Ke-Horng Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The self-calibrated knee voltage detector (SC-KVD) for electrical isolation primary side charger applications is proposed. The removal of the feedback network which is used in conventional designs and occupies at least 30 μm2 can save PCB area up to around 11%. Besides, the SC-KVD can dynamically adjust the detection point to improve the accuracy to 99.65% compared to the prior arts. The test chip fabricated in 0.5 μm 500 V UHV process can be powered on directly by the AC source owing to the 500 V ultra-high voltage device. Hence, the battery charger can be made more compact and portable than it was and the battery life can be prolonged and guaranteed.

Original languageEnglish
Article number6872608
Pages (from-to)2786-2795
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume61
Issue number10
DOIs
StatePublished - 1 Oct 2014

Keywords

  • Charger
  • constant current (CC)
  • constant voltage (CV)
  • deep green mode (DG)
  • discontinuous conduction mode (DCM)
  • electrical isolation
  • self-calibrated knee voltage detection (SC-KVD)
  • voltage accuracy

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