Abstract
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’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 2.6–90.5 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 language | English |
|---|---|
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | IEEE Journal of Solid-State Circuits |
| DOIs | |
| Publication status | Accepted/In press - 2024 |
Keywords
- Biomedical implantable devices
- dual output
- regulating rectifier
- single-stage receiver (RX)
- voltage doubler (VD)
- wireless power transfer (WPT)