A Single-Stage Dual-Output Regulating Voltage Doubler for Wireless Power Transfer

Tianqi Lu, Kofi A.A. Makinwa, Sijun Du*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


A single-stage dual-output regulating voltage doubler (DOVD) is proposed for biomedical wireless power transfer (WPT) systems. Derived from the full-wave voltage doubler (VD) topology, it achieves ac-to-dc rectification and dual-output voltage regulation in a single stage by using only two power transistors. The DOVD&#x2019;s inherent voltage conversion ratio (VCR) of 2 enhances the overall voltage gain of a WPT system, thus extending the transfer range against varying link conditions. To eliminate cross-regulation between the two outputs and provide fast load-transient responses, a parallel pulse-frequency modulation (PPFM) controller is proposed. In addition, a digital-tuning adaptive delay compensation technique with fast error-variation responses is proposed to achieve soft-switching in the power stage. Implemented in a 180-nm Bipolar-CMOS-DMOS (BCD) technology and operating at 6.78 MHz, the proposed DOVD achieves dual regulated outputs at 1.8 and 3.3 V, a VCR of up to 1.875, and a power conversion efficiency (PCE) of up to 92.95% over an output power range of 2.6&#x2013;90.5 mW. It also achieves instant load-transient responses and unnoticeable cross-regulation during 25<inline-formula> <tex-math notation="LaTeX">$\times$</tex-math> </inline-formula> load transients at both outputs.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Publication statusAccepted/In press - 2024


  • Biomedical implantable devices
  • dual output
  • regulating rectifier
  • single-stage receiver (RX)
  • voltage doubler (VD)
  • wireless power transfer (WPT)


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