A quad-mode structure-reconfigurable regulating rectifier (SR-RR) is presented for a wireless power transfer system. The proposed SR-RR combines an ac–dc regulating rectifier and a dc–dc boost converter in a single stage. The regulating rectifier converts the received wireless power to an output load and stores the excess power in a storage element to improve the power conversion efficiency. By allowing the regulating rectifier and the boost converter to share a receiver (RX) coil with adjustments to the power stage structure, the SR-RR operates as a dc–dc boost converter to extend the output power without requiring additional inductors. Freewheeling operation skips power to realize single-stage voltage regulation. In addition, the SR-RR operation mode is automatically selected from among four: charging, storing, boost converting, and freewheeling. The chip, fabricated in a 0.18- <tex-math notation="LaTeX">μ m </tex-math> CMOS process, can regulate an output voltage of 5 V and a stored voltage of 3.7 V. The measurement results demonstrate a 1.7 <tex-math notation="LaTeX">× </tex-math> output power extension. Peak RX efficiency reaches 91.8%, while system efficiency reaches 64.7%.
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Yang et al. (2023) studied this question.
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